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HomeMy WebLinkAbout09/08/2026M DIA�nO11iD BAR IIIIT City of Diamond Bar Planning Commission Agenda Brian Worthington, Chair Lee Mao, Vice Chair Surendra Mehta, Commissioner William Rawlings, Commissioner Ruben Torres, Commissioner Meeting Date: Tuesday, September 8, 2026 Regular Meeting 6:30 p.m. Diamond Bar City Hall - Windmill Community Room 21810 Copley Drive, Diamond Bar CA 91765 WELCOME TO A MEETING OF THE DIAMOND BAR PLANNING COMMISSION Meetings are open to the public, and you are invited to attend and participate. Agendas for regular Planning Commission meetings are available 72 hours prior to the meeting and are posted in the City's regular posting locations and on the City's website. The Planning Commission may take action on any item listed on the agenda. RESOURCES Copies of agendas and agenda packets are on file and available for public inspection in the Planning Division of the Community Development Department at 21810 Copley Drive, Diamond Bar, CA 91765 or online at www.diamondbarca.gov/agendas. For more information about the agendas or rules of the Planning Commission, please email the Community Development Department (commdev@diamondbarca.gov) or call 909-839-7030. AMERICANS WITH DISABILITY ACT ACCOMMODATION In compliance with the Americans with Disabilities Act, if you need special assistance, a disability - related modification or accommodation, agenda materials in an alternative format, or auxiliary aids to participate in this meeting, please email the Community Development Department (commdev@diamondbarca.gov) or call 909-839-7030 as soon as possible. Providing at least 72 hours' notice will help ensure that reasonable arrangements can be made. PUBLIC INPUT The public may provide public comment by attending the meeting in person or by sending an email. Please email the Community Development Department (commdev@diamondbarca.gov)by 4:00 p.m. on the day of the meeting and indicate in the Subject Line "FOR PUBLIC COMMENT." Written comments will be distributed to the Planning Commission Members and noted for the record at the meeting. Speakers are limited to five (5) minutes per agenda item, unless the Chairperson determines otherwise. The Chairperson may adjust this time limit depending on the number of people wishing to speak, the complexity of the matter, the length of the agenda, the hour and any other relevant consideration. Speakers may address the Planning Commission only once on an agenda item, City of Diamond Bar Planning Commission Page 1 of 70 Diamond Bar Planning Commission Agenda September 8, 2026 except during public hearings, when the applicant/appellant may be afforded a rebuttal. Any material to be submitted to the Planning Commission at the meeting should be submitted through the Administrative Coordinator. Public comments must be directed to the Planning Commission. A person who disrupts the orderly conduct of the meeting after being warned by the Chairperson or the Chairperson's designee that their behavior is disrupting the meeting may result in the person being removed from the meeting. City of Diamond Bar Planning Commission Page 2 of 70 Diamond Bar Planning Commission Agenda September 8, 2026 1. CALL TO ORDER: 6:30 p.m., Windmill Room PLEDGE OF ALLEGIANCE: ROLL CALL: Commissioners Mehta, Rawlings, Torres, Vice Chair Mao, Chair Worthington APPROVAL OF AGENDA: Chair 2. PUBLIC COMMENTS: "Public Comments" is the time reserved on each regular meeting agenda to provide an opportunity for members of the public to directly address the Planning Commission on Consent Calendar items or other matters of interest not on the agenda that are within the subject matter jurisdiction of the Planning Commission. Although the Planning Commission values your comments, pursuant to the Brown Act, members of the Planning Commission may briefly respond to public comments if necessary, but no extended discussion and no action on such matters may take place. There is a five-minute maximum time limit when addressing the Planning Commission. 3. CONSENT CALENDAR: All items listed on the Consent Calendar are considered by the Planning Commission to be routine and will be acted on by a single motion unless a Planning Commission Member or member of the public request otherwise, in which case, the item will be removed for separate consideration. 3.1 July 28, 2026, Planning Commission Meeting Minutes Recommended Action: Staff recommends the Planning Commission approve the July 28, 2026, Planning Commission meeting minutes as received. 4. PUBLIC HEARINGS: 4.1 Tentative Parcel Map No. 83773 Case No. PL2022-1 19: The applicant is requesting City approval to subdivide an existing 100,188 square -foot (2.3 gross acre) lot developed with an existing single-family residence into two lots for the future development of a new single- family residence on the newly created lot. Proposed Parcel 1 is 48,352 square feet (1.11 gross acres) and proposed Parcel 2 is 51,836 square feet (1.19 gross acres). The existing single-family residence will remain on proposed Parcel 1 and a new single-family residence will be proposed on proposed Parcel 2 at a future time. The property is zoned Rural Residential (RR), and the underlying General Plan land use designation is also named Rural Residential. After evaluating the application, staff finds that the proposed Tentative Parcel Map complies with the City's Subdivision Ordinance and that the subdivision findings required pursuant to Diamond Bar City Code Section 21.20.080 can be made. Environmental Assessment: This project has been reviewed for compliance with the California Environmental Quality Act (CEQA). Staff prepared and filed an Initial Study/Environmental Checklist and Notice City of Diamond Bar Planning Commission Page 3 of 70 Diamond Bar Planning Commission Agenda September 8, 2026 of Intent to Adopt a Mitigated Negative Declaration for the project on August 12, 2026, with the Los Angeles County Clerk and it is part of this report (Attachment 2). Pursuant to CEQA Section 15105, the public review period for the Mitigated Negative Declaration began on August 12, 2026, and ended September 1, 2026. The average slope of the subject property is 32 percent. The project would otherwise qualify for a categorical exemption from CEQA pursuant to Article 19, Section 15315, Class 15 (Minor Land Divisions) of the CEQA Guidelines. However, because the average slope of the property exceeds 20 percent, the project does not qualify for the exemption. The Initial Study is a preliminary analysis to determine whether a Negative Declaration, Mitigated Negative Declaration, or Environmental Impact Report (EIR) is needed for a project. If the Initial Study concludes that the proposed project will not significantly affect the environment or may have the potential to affect the environment but can be mitigated to a level of less than significant, a Negative Declaration or a Mitigated Negative Declaration may be prepared, respectively. A Mitigated Negative Declaration is a document that briefly describes the reasons that a proposed project will not have a significant effect on the environment. It is used to guide and assist the City staff, Planning Commission, City Council, and the public in the consideration and evaluation of potential environmental impacts that may result from the proposed project's development. Once the Initial Study and Mitigated Negative Declaration are prepared, a Notice of Intent to Adopt a Mitigated Negative Declaration is posted at the Los Angeles County Clerk and published in the San Gabriel Valley Tribune newspaper. The public review period must be no less than 20 days. Staff prepared the Initial Study/Environmental Checklist for the proposed project, which documents reasons to support the findings that the proposed project would not have any potentially significant impacts on the environment with the proposed mitigation measures. Assembly Bill 52 - Tribal Consultation AB 52 requires notification/request for tribal consultation for projects subject to CEQA. A notification list was obtained from the Native American Heritage Commission and the City sent notices to the Tribes informing them of the opportunity to request consultation. On January 20, 2026, the City received a letter from the Gabrieleno Band of Mission Indians (Kizh Nation) stating that the project area adjoins or overlaps the tribe's ancestral territories. The tribe thus requested that a certified Native American Monitor be on site during any and all ground disturbances —including, but not limited to, pavement removal, post holing, auguring, boring, grading, excavation and trenching —to protect any cultural resources which may be affected during construction or development. Staff has included all mitigation measures proposed by the tribe (TCR-1 to TCR-3) in the Mitigation Monitoring and Reporting Program. Recommended Action: Adopt the attached Resolution (Attachment 1) recommending the approval of Tentative Parcel Map No. 83773 Case No. PL2022-1 19 to the City Council, to allow a subdivision of an existing lot into two separate lots, based on the findings, subject to conditions of approval City of Diamond Bar Planning Commission Page 4 of 70 Diamond Bar Planning Commission Agenda September 8, 2026 as listed within the draft resolution. 5. PLANNING COMMISSION COMMENTS/INFORMATION ITEMS: 6. STAFF COMMENTS/INFORMATIONAL ITEMS: 6.1 Project Status Report Recommended Action: Staff recommends the Planning Commission receive and file the Project Status Report dated September 8, 2026. 7. SCHEDULE OF FUTURE EVENTS: 7.1 City Council Meeting - September 15, 2026 - 6:30 p.m., SCAQMD Main Auditorium, 21865 Copley Dr. 7.2 Planning Commission Meeting - September 22, 2026 - 6:30 p.m., City Hall Windmill Room, 21810 Copley Dr. 7.3 City Council Meeting - October 6, 2026 - 6:30 p.m., SCAQMD Main Auditorium, 21865 Copley Dr. 7.4 Planning Commission Meeting - October 13, 2026 - 6:30 p.m., City Hall Windmill Room, 21810 Copley Dr. 7.5 City Council Meeting - October 20, 2026 - 6:30 p.m., SCAQMD Main Auditorium, 21865 Copley Dr. 8. ADJOURNMENT: CERTIFICATION I, Arlene Laviera, Administrative Coordinator, City of Diamond Bar, hereby certify, under penalty of perjury under the laws of the State of California that the foregoing notice was posted pursuant to Government Code Section 54950 Et. Seq., not less than 72 hours prior to the meeting, at the following locations: Diamond Bar City Hall Kiosk, Diamond Bar City Hall Bulletin Board, City website: www.diamondbarca.gov, and Diamond Bar Library. Arlene Laviera Administrative Coordinator Date Posted: September 3, 2026 City of Diamond Bar Planning Commission Page 5 of 70 Agenda Item #: 3.1 Meeting Date: September 8, 2026 PLANNING COMMISSION AGENDA REPORT TO: Chair and Members of the Planning Commission FROM: Greg Gubman, Community Development Director SUBJECT: July 28, 2026, Planning Commission Meeting Minutes RECOMMENDATION: Staff recommends the Planning Commission approve the July 28, 2026, Planning Commission meeting minutes as received. BACKGROUND/DISCUSSION: Minutes have been prepared and are being presented for approval. PREPARED BY: Arlene Laviera, Administrative Coordinator, Community Development ATTACHMENTS: 07-28-26 Minutes Page 6 of 70 MINUTES OF THE CITY OF DIAMOND BAR REGULAR MEETING OF THE PLANNING COMMISSION July 28, 2026 1. CALL TO ORDER: VC/Mao called the meeting to order at 6.30 p.m. in the Windmill Community Room, 21810 Copley Drive, Diamond Bar, CA 91765. PLEDGE OF ALLEGIANCE: ROLL CALL: ABSENT: Rawlings Mehta, Rawlings, Torres, V/C Mao C/Worthington STAFF PRESENT: Greg Gubman, Community Development Director, Grace Lee, Planning Manager, Rudy Lopez, Assistant Planner, Arlene Laviera, Administrative Coordinator; Hal Ghafari, Public Works Manager, Vivian Chen, Assistant Engineer, James H. Eggart, Assistant City Attorney and Dan Cruz, Assistant City Attorney. APPROVAL OF AGENDA: Chair approved. 2. PUBLIC COMMENTS: Barbara Collins-Ludowitz, resident, expressed concerns such as traffic, parking and other issues related to the proposed condominium project located at 1400 Montefino Avenue. 3. CONSENT CALENDAR: 3.1 MINUTES OF THE PLANNING COMMISSION REGULAR MEETING — May 26, 2026. Rawlings moved, and Torres seconded to approve consent calendar. Motion carried 4-0-0-1 by the following Roll Call vote: AYES: 4 COMMISSIONERS: Mehta, Rawlings, Torres, VC/Mao NOES: 0 COMMISSIONERS: None ABSTAIN: 0 COMMISSIONERS: None ABSENT: 1 COMMISSIONERS: Worthington 4. PUBLIC HEARING: 4.1 Tranquil Garden 36-Unit Residential Condominium Project Case No. PL2025-77: The property owner, Rita Huang, and applicant, Daphne Shen, are requesting approval Page 7 of 70 July 28, 2026 PAGE 2 PLANNING COMMISSION of a Vesting Tentative Tract Map (VTTM) and Development Review (DR) for the construction of a new four-story, 36-unit residential condominium development with a gym, clubhouse, open courtyard, and a community rooftop garden on a 0.99-acre undeveloped parcel located between the westerly terminus of Gentle Springs Lane and South Prospectors Road. The Project site is identified in the City's Housing Element as a site suitable for the development of affordable housing. The applicant proposes designating 3 of the 36 units for sale to low-income households, and the proposed project is designed to incorporate a twenty percent (20%) density bonus, one incentive/concession, three waivers and reductions of development standards, and reduced parking ratios pursuant to the State Density Bonus Law (SDBL). This project will be the first development within the newly adopted Town Center Specific Plan area and implements the Specific Plan's land use and housing objectives. The applicant has invoked the new Assembly Bill 130 (AB 130) CEQA exemption for infill housing developments, and the proposed project is therefore subject to an expedited review and decision by the Planning Commission and City Council. The project was originally noticed for a public hearing before the Planning Commission on July 14, 2026, but the public hearing was rescheduled to July 28, 2026, at the applicant's request. Environmental Assessment: This Project has been reviewed for compliance with the California Environmental Quality Act (CEQA). Based on that assessment, Staff recommends that the Planning Commission recommend that the City Council determine that the proposed project is exempt from CEQA pursuant to AB 130. (Codified as Public Resources Code § 21080.66.) AB 130 created a new statutory CEQA exemption for infill housing development projects meeting specified criteria and which have undergone a consultation process with California Native American tribes that are traditionally and culturally affiliated with the project site. (Codified as Public Resources Code § 21080.66.) Among other requirements, the exemption applies to housing development projects that are located within an urbanized area and on a site that is less than 20 acres in size and consistent with the applicable General Plan and zoning designation. The project must also achieve a minimum density of 15 dwelling units per acre and comply with objective development standards and applicable State housing laws, including density bonus provisions where applicable. In addition, the site cannot be located within environmentally sensitive or hazardous areas identified by State law, such as wetlands, designated conservation lands, very high fire hazard severity zones (in certain circumstances), hazardous waste sites, or other historic or otherwise protected resource areas listed in the statute. Based on City staff's review and the AB 130 CEQA Checklist provided by the applicant on June 23, 2026 (included as Attachment 4), the proposed 36-unit residential Page 8 of 70 July 28, 2026 PAGE 3 PLANNING COMMISSION condominium development is located within a developed urban area, is consistent with the site's land use designation and zoning regulations, and complies with applicable objective development standards. The project site is not located within any of the environmentally sensitive or hazardous areas identified in the statute, and no historic resources have been identified on the property. Accordingly, City staff has determined that the Project satisfies the applicable requirements of Assembly Bill 130 and is therefore recommending that the proposed project be found to be exempt from further environmental review under CEQA. Freeway Proximity Requirements For projects located within 500 feet of a freeway, AB 130 requires that buildings have a centralized HVAC systems with air intakes facing away from the freeway, provide specified air filtration media that must be replaced at the manufacturer's designated interval, and not have any balconies facing the freeway. The proposed project is located within 500 feet of the 60 Freeway, but meets (or will be conditioned to meet) all of these requirements. Tribal Cultural Resources While AB 130 provides a statutory exemption from further environmental review for qualifying housing development projects, the legislation established its own tribal consultation requirements to ensure that potential impacts to tribal cultural resources are identified and addressed. As required by AB 130, the City initiated and concluded AB 130 tribal consultation with each tribe that is traditionally and culturally affiliated with the project site and that requested such consultation. Based on tribal consultation, measures have been incorporated into the project's conditions of approval that are designed to avoid significant impacts to tribal cultural resources. A summary of AB 130 Tribal Consultation for the Tranquil Garden project is included as Attachment 5. Recommended Action: Conduct a public hearing and adopt the attached Resolution (Attachment 1) recommending that the City Council approve the Tranquil Garden 36-unit residential condominium project (Case No. PL2025-77), consisting of a State Density Bonus Law Application, Vesting Tentative Tract Map No. 83259, and Development Review, subject to conditions, making necessary findings pursuant to provisions of Government Code Section 65915, Government Code Section 65863, and Diamond Bar City Code (DBCC) Chapters 22.18, 21.20, and 22.48, and find that the Project is exempt from the California Environmental Quality Act pursuant to Public Resources Code Section Page 9 of 70 July 28, 2026 PAGE 4 PLANNING COMMISSION 21080.66. PM/ Grace Lee presented the staff report. VC/Mao opened it up for the commissioners to ask questions of staff. The Commission presented questions related to traffic, easements, parking and the number of housing units the City needs to provide according to the Regional Housing Needs Assessment. Staff responded to the questions of the commission. VC/Mao opened the public hearing. Mr. Kevin Kohan, representing the applicant, stated the applicant is in agreement with most of the conditions of approval except for the following: A6, B6, E15, and E19 related to the Vesting Tentative Tract Map. Mr. Kohan indicated that the applicant intends to meet with staff to discuss these conditions further after the meeting. V/C Mao seeing no comments, closed the public hearing. Rawlings moved, Mehta seconded to adopt Resolution No. 2026-09 recommending that the City Council approve the Tranquil Garden 36-Unit Residential Condominium Project Case No. PL2025-77, subject to the standard conditions. Motion carried 4-0-0-1 by the following Roll Call vote: AYES: 4 COMMISSIONERS: Mehta, Rawlings, Torres, VC/Mao NOES: 0 COMMISSIONERS: None ABSTAIN: 0 COMMISSIONERS: None ABSENT: 1 COMMISSIONERS: Worthington 7. PLANNING COMMISSION COMMENTS/INFORMATION ITEMS: 8. STAFF COMMENTS/INFORMATIONAL ITEMS: CDD/Gubman reported to the Planning Commission that there are no items scheduled in August. The next meeting is scheduled for September 8, 2026 at 6:30 p.m. 9. SCHEDULE OF FUTURE EVENTS: As noted in the agenda. Page 10 of 70 July 28, 2026 PAGE 5 PLANNING COMMISSION 10. ADJOURNMENT: With no further business before the Planning Commission, VC/Mao adjourned the Regular Planning Commission meeting at 7:20 p.m. The foregoing minutes are hereby approved this 81h day of September, 2026. Lee Mao, Vice Chairperson Attest: Respectfully Submitted, Greg Gubman, Community Development Director Page 11 of 70 CASE/FILE NUMBER: PROJECT LOCATION: GENERAL PLAN DESIGNATION: Agenda Item #: 4.1 Meeting Date: September 8, 2026 PLANNING COMMISSION AGENDA REPORT P L2022-1 19 23901 Ridge Line Road Diamond Bar, CA 91765 AP N : 8713-004-016 Rural Residential (RR) ZONING DISTRICT: Rural Residential (RR) PROPERTY OWNER: Arun Jain 23901 Ridge Line Road Diamond Bar, CA 91765 APPLICANT: Pete Volbeda 215 N 2nd Avenue, Suite B Upland, CA 91786 SUMMARY: The applicant is requesting City approval to subdivide an existing 100,188 square -foot (2.3 gross acre) lot developed with an existing single-family residence into two lots for the future development of a new single- family residence on the newly created lot. Proposed Parcel 1 is 48,352 square feet (1.11 gross acres) and proposed Parcel 2 is 51,836 square feet (1.19 gross acres). The existing single-family residence will remain on proposed Parcel 1 and a new single-family residence will be proposed on proposed Parcel 2 at a future time. The property is zoned Rural Residential (RR), and the underlying General Plan land use designation is also named Rural Residential. After evaluating the application, staff finds that the proposed Tentative Parcel Map complies with the City's Subdivision Ordinance and that the subdivision findings required pursuant to Diamond Bar City Code Section 21.20.080 can be made. RECOMMENDATION: Adopt the attached Resolution (Attachment 1) recommending the approval of Tentative Parcel Map No. 83773 Case No. PL2022-1 19 to the City Council, to allow a subdivision of an existing lot into two separate lots, based on the findings, subject to conditions of approval as listed within the draft resolution. BACKGROUND: The project site is located in the Diamond Bar Country Estates (The Country), on the north side of Ridge Line Road, west of Derringer Lane. The property is currently developed with an existing single-family residence. The property has six protected trees on -site but no protected trees are proposed for removal with the subdivision. If trees are proposed for removal during construction of the proposed single-family residence, the City's Tree Preservation Ordinance requires the applicant to obtain a Tree Permit with appropriate mitigation. In 2019, a Lot Line Adjustment (LLA) was recorded to adjust the side property line between the subject property Page 12 of 70 Agenda Item #: 4.1 Meeting Date: September 8, 2026 and 23819 Ridge Line (property to the west). Prior to the LLA, the subject parcel was 1.81 acres, and the neighboring parcel was 1.5 acres. After the LLA was recorded, the subject parcel increased in size to 2.3 acres, and the neighboring parcel was reduced to 1.02 acres. The LLA was processed to allow the subject property to acquire sufficient land to meet the minimum one -acre lot size requirement for a two -lot subdivision. Original configuration xl L� M rr k" moo-i M : 6i1 K � :d11K ' ppgl DO lQ @ f1Att : ]a t 1]0.K pW . Y A � k ROM UK AP LOT LINE ADJ JMWEW loll 51 uo dx, 1k XCW ,roK. e N OR TH a r-w After Lot Line Adjustment The property is legally described as Lot 62 of Tract No. 30091, and the Assessor's Parcel Number (APN) is 8713- 004-016. Site and and Surrounding Plan, Zoninaand Land UsesPlan, Zoninaand Land Uses The image on the following page highlights the subject property: Page 13 of 70 99 ,�$,• ,Y f, __ 5,� � � ti � , �f Agenda Item #: 4.1 Meeting Date: September 8, 2026 239a1 Ridge Line (Proposed Parcel 1) Adjacent Property to the East The following table summarizes the land use status of the subject property and its surroundings: General Designation Zoning. - Site Rural Residential RR Single -Family Residential North Rural Residential RR Single -Family Residential South Rural Residential RR Single -Family Residential East Rural Residential RR Single Family Residential West Rural Residential RR Single -Family Residential Project Description The proposed two -lot subdivision would facilitate the development of a single-family residence on the newly - created parcel. The gross and net size (after the dedication of the private street easement) of each lot is provided in the table below. Page 15 of 70 Agenda Item #: 4.1 Meeting Date: September 8, 2026 A Development Review application for the single-family home on proposed Parcel 2 will be submitted for processing in the future. TENTADVE R IN THE Crr BEING A SUBMISJON Of ADJUSTEI CASE NO. LLA-18-79, I IN THE OFFICE QE THE RE0 STATE .0 XUP, up W112 li 1elk� f ~ Ciyp 1� db.Pd NORTH Tentative Parcel Map ANALYSIS: Review Authority (Diamond Bar City Code Section 21.01) Page 16 of 70 Agenda Item #: 4.1 Meeting Date: September 8, 2026 Section 21.02.040 of the Diamond Bar City Code requires all subdivision applications to be reviewed and approved by the City Council. Therefore, the Planning Commission will be forwarding a recommendation to the City Council for this request. Tentative Map: A tentative map approves the division of land for the purpose of sale, lease, or financing, and is governed by the Subdivision Map Act. A tentative map prescribes how the land is to be subdivided. The City of Diamond Bar's Subdivision Ordinance establishes the minimum standards for the design of the lots, and the public improvements which serve them. A subdivision of four or fewer parcels requires a parcel map, and a subdivision of five or more parcels requires a tract map. When a Planning Commission or City Council considers a tentative parcel or tract map, it must be reviewed in light of the required findings mandated by State law for approval or denial of the map. Once the tentative map is approved, the more refined final map is approved by the City Council if deemed by the City Engineer to be in substantial conformance with the tentative map. The final map is then recorded with the Los Angeles County Recorder's Office, after which the newly -created parcels may be individually sold and developed pursuant to the underlying zoning regulations. The maximum allowed density for the Rural Residential General Plan land use designation and zoning district is one dwelling unit per gross acre (1 DU/AC). Because both proposed lots comprising the 2.3-acre project site exceed one acre in size, the proposed project is in compliance with the City's General Plan with regards to density. Development Standards: The proposed subdivision is in compliance with the City's Development Code standards pertaining to lot size and dimensions. The tables below compare the proposed subdivision with the City's Subdivision and Development Code standards: Page 17 of 70 Agenda Item #: 4.1 Meeting Date: September 8, 2026 The subdivision design enables the proposed parcels to comply with development standards as shown in the table below: Development Feature Development Standards Existing Proposed Meets Requirements Front Setback 30 feet 20 feet Parcel 1: No* Parcel 2: 30' Side Setback 15 feet on one Parcel 1: 10' - west side Yes side, 186' - east side 15' - east side 10 feet on the 10' - west side Parcel 2: 14' - west side other 68' - east side Side Yard 25 feet Parcel 1: 30' - west side Yes Minimum 204' - east side 29' - east side Between 10' - west side Parcel 2: 29' - west side Adjoining 86' - east side Structures Rear Setback 25 feet 5 feet Parcel 1: 5 feet *No Parcel 2: 25 feet Yes Retaining Wall 4-foot exposed Parcel 1: N/A N/A Height (supporting fill) N/A Parcel 2: 4-foot exposed Yes (supporting fill) *Legal Nonconforming structure (no changes) The City's subdivision standards require proposed building pad locations to be identified for parcels with a slope of 20 percent or greater. Because the average slope of the site is approximately 32 percent, the applicant provided a conceptual grading plan to demonstrate the constructability of the proposed lot in conformance with the RR zone development standards (see the exhibits accompanying the Tentative Parcel Map in Attachment 3). As part of the subdivision review, staff sent notices to all public utility companies and service agencies regarding the proposed subdivision request. All agencies will be expected to provide service to the new lot, including providers of gas, electrical, water, sewer, and cable television services. The applicant has separately submitted the proposed subdivision to the Diamond Bar Country Estates Association Architectural Committee under a separate obligation to do so under the homeowner association's CC&Rs. The detailed site planning, building footprints, floor plan, exterior design, landscaping and grading will be submitted for review during the Development Review application process for the development of the new lot. As set forth in the above analysis, the proposed subdivision is in conformance with the City's General Plan and zoning, and all applicable requirements of the Subdivision Map Act. The project complies with the minimum lot area and density. No variances or exceptions are requested, and all public utilities and services are available to service the project. Access and Circulation The Country is a gated residential community served by fully improved private streets. The proposed subdivision will not interfere with the existing access from Ridge Line Road. Page 18 of 70 Agenda Item #: 4.1 Meeting Date: September 8, 2026 Comaatibility with Neiahborhood The proposed subdivision is consistent with the City's General Plan in that it complies with the maximum density allowance of one dwelling unit per gross acre. The site is surrounded by single-family residential development and therefore will be compatible with the surrounding uses. To ensure that the architectural and site plan design complies with the City's Development Code and Design Guidelines, the design of the buildings and landscaping on the new lot will be reviewed during the Development Review application process. Parkland Dedication Pursuant to the Subdivision Ordinance, the City requires the dedication of land or payment of fees for park or recreational purposes. The land or fees are to be used only for the purpose of developing new or rehabilitating existing park or recreational facilities to serve the subdivision, and the amount and location of land to be dedicated or amount of fees paid shall bear a reasonable relationship to the use of the park and recreational facilities by the future inhabitants of the subdivision. The amount of acreage required to be dedicated by the applicant is based upon the number of dwelling units from the subdivision. The proposed subdivision will result in one additional dwelling unit. The required dedicated acreage is computed using the following formula: X = .005(UP) Where X = Amount of parkland required, in acres U = Total number of approved dwelling units in the subdivision (one) P = 3.4 for single-family dwellings The in -lieu fee equals the parkland obligation derived from the formula above, multiplied by the fair market value of the land for the appropriate park planning area of 0.017 acres. Staff recommends using a fair market value of $2.8 million per acre, consistent with the recent local benchmark for comparable land sales in Diamond Bar, to acquire land for park space. The in -lieu fee for this project is determined to be $47,600 and shall be paid prior to final map approval (see Condition of Approval #9 under Tentative Parcel Map Conditions). Additional Review The Public Works Department and Building and Safety Division reviewed this project, and their comments are included in the attached resolution as conditions of approval. NOTICE OF PUBLIC HEARING: On August 28, 2026, public hearing notices were mailed to property owners within a 1,000-foot radius of the project site. The notice was submitted to the San Gabriel Valley Tribune newspaper for publication on August 28, 2026. A notice display board was posted at the site, and a copy of the notice was posted at the City's designated community posting sites. PUBLIC COMMENTS RECEIVED: On August 27, 2026, staff received an email from a resident stating that public records indicate the subject lot is 1.79 acres and, therefore, the subdivision does not comply with the City's minimum lot size requirement of one acre. As noted in the Background section, a Lot Line Adjustment was recorded for the subject property on December 13, 2019, which enlarged the property to meet the minimum lot size requirement and facilitate the proposed subdivision. The commenter also noted that the Diamond Bar Country Estates Association (DBCEA) is the governing board for the property and that the property owner should obtain approval from the DBCEA. While true that the Page 19 of 70 Agenda Item #: 4.1 Meeting Date: September 8, 2026 property owner is subject to CC&Rs of the DBCEA, it is the owner's separate obligation to follow the DBCEA's rules. The proposed subdivision fully conforms to the City's Subdivision Ordinance and zoning regulations applicable to the site, and the City must base its decision solely on whether the required findings for approval of the tentative map can be made. ENVIRONMENTAL ASSESSMENT: This project has been reviewed for compliance with the California Environmental Quality Act (CEQA). Staff prepared and filed an Initial Study/Environmental Checklist and Notice of Intent to Adopt a Mitigated Negative Declaration for the project on August 12, 2026, with the Los Angeles County Clerk and it is part of this report (Attachment 2). Pursuant to CEQA Section 15105, the public review period for the Mitigated Negative Declaration began on August 12, 2026, and ended September 1, 2026. The average slope of the subject property is 32 percent. The project would otherwise qualify for a categorical exemption from CEQA pursuant to Article 19, Section 15315, Class 15 (Minor Land Divisions) of the CEQA Guidelines. However, because the average slope of the property exceeds 20 percent, the project does not qualify for the exemption. The Initial Study is a preliminary analysis to determine whether a Negative Declaration, Mitigated Negative Declaration, or Environmental Impact Report (EIR) is needed for a project. If the Initial Study concludes that the proposed project will not significantly affect the environment or may have the potential to affect the environment but can be mitigated to a level of less than significant, a Negative Declaration or a Mitigated Negative Declaration may be prepared, respectively. A Mitigated Negative Declaration is a document that briefly describes the reasons that a proposed project will not have a significant effect on the environment. It is used to guide and assist the City staff, Planning Commission, City Council, and the public in the consideration and evaluation of potential environmental impacts that may result from the proposed project's development. Once the Initial Study and Mitigated Negative Declaration are prepared, a Notice of Intent to Adopt a Mitigated Negative Declaration is posted at the Los Angeles County Clerk and published in the San Gabriel Valley Tribune newspaper. The public review period must be no less than 20 days. Staff prepared the Initial Study/Environmental Checklist for the proposed project, which documents reasons to support the findings that the proposed project would not have any potentially significant impacts on the environment with the proposed mitigation measures. Assembly Bill 52 - Tribal Consultation AB 52 requires notification/request for tribal consultation for projects subject to CEQA. A notification list was obtained from the Native American Heritage Commission and the City sent notices to the Tribes informing them of the opportunity to request consultation. On January 20, 2026, the City received a letter from the Gabrieleno Band of Mission Indians (Kizh Nation) stating that the project area adjoins or overlaps the tribe's ancestral territories. The tribe thus requested that a certified Native American Monitor be on site during any and all ground disturbances —including, but not limited to, pavement removal, post holing, auguring, boring, grading, excavation and trenching —to protect any cultural resources which may be affected during construction or development. Staff has included all mitigation measures proposed by the tribe (TCR-1 to TCR-3) in the Mitigation Monitoring and Reporting Program. PREPARED BY: Mayuko Nakajima, Senior Planner, Planning ATTACHMENTS: 1. Draft Resolution No. 2026-XX and Conditions of Approval Page 20 of 70 Agenda Item #: 4.1 Meeting Date: September 8, 2026 Notice of Mitigated Negative Declaration and Initial Study/Environmental Checklist Tentative Parcel Map No. 83773 Page 21 of 70 PLANNING COMMISSION RESOLUTION NO. 2026-XX A RESOLUTION OF THE PLANNING COMMISSION OF THE CITY OF DIAMOND BAR, CALIFORNIA, RECOMMENDING APPROVAL OF MITIGATED NEGATIVE DECLARATION AND TENTATIVE PARCEL MAP NO. 83773 FOR THE SUBDIVISION OF AN EXISTING 2.3 ACRE LOT INTO TWO LOTS FOR THE FUTURE DEVELOPMENT OF A NEW SINGLE-FAMILY RESIDENCE ON THE NEWLY CREATED LOT LOCATED AT 23901 RIDGE LINE ROAD, DIAMOND BAR, CALIFORNIA (APN 8713-004-016). A. RECITALS The property owner, Arun Jain, and applicant, Pete Volbeda, have filed an application for Tentative Parcel Map No. 83773 Case No. PL2022-119 to subdivide an existing lot into two separate lots for the development of a single- family residence on the newly created lot located at 23901 Ridge Line Road. Hereinafter in this resolution, the subject Tentative Parcel Map shall be collectively referred to as the "Project." 2. The subject property is made up of one parcel totaling 100,188 gross square feet (2.3 acres). It is located in the Rural Residential (RR) zone with an underlying General Plan land use designation of Rural Residential. 3. The legal description of the subject property is Lot 62 of Tract No. 30091. The Assessor's Parcel Number is 8713-004-016. 4. Notification of the public hearing for this project was published in the San Gabriel Valley Tribune newspaper on August 28, 2026. Public hearing notices were mailed to property owners within a 1000-foot radius of the project site. In addition to the published and mailed notices, the project site was posted with a display board and public notices were posted at the City's designated community posting sites. 5. On September 8, 2026, the Planning Commission of the City of Diamond Bar conducted a duly noticed public hearing, solicited testimony from all interested individuals, and concluded said hearing on that date; and 6. The documents and materials constituting the administrative record of the proceedings upon which the City's decision is based are located at the City of Diamond Bar, Community Development Department, Planning Division, 21810 Copley Drive, Diamond Bar, CA 91765. B. RESOLUTION NOW, THEREFORE, it is found, determined and resolved by the Planning Commission of the City of Diamond Bar as follows: Page 22 of 70 The Planning Commission hereby specifically finds that all of the facts set forth in the Recitals, Part A, of this Resolution are true and correct; and 2. In accordance to the provisions of the California Environmental Quality Act (CEQA), Section 15070, the City prepared and filed an Initial Study and Notice of Intent to Adopt Mitigated Negative Declaration for the project on August 12, 2026, with the Los Angeles County Clerk. Pursuant to CEQA Section 15105, the public review period for the Mitigated Negative Declaration began on August 12, 2026, and ended September 1, 2026, for a total of 20 days. C. FINDINGS OF FACT Based on the findings and conclusions set forth herein and as prescribed under Diamond Bar City Code (DBCC) Section 21.20, this Planning Commission hereby recommends that the City Council make the following findings: The Planning Commission hereby specifically finds and determines that, having considered the record as a whole including the findings set forth below, and changes and alterations which have been incorporated into and conditioned upon the proposed project set forth in the application, there is no evidence before this Planning Commission that the project proposed herein will have the potential of an adverse effect on wild life resources or the habitat upon which the wildlife depends. Based upon substantial evidence, this Planning Commission hereby rebuts the presumption of adverse effects contained in Section 753.5(d) of Title 14 of the California Code of Regulations; Tentative Map Findings: Pursuant to Subdivision Code Section 21.20.080 of the City's Subdivision Ordinance, the Planning Commission recommends that the City Council make the following findings: a. The proposed subdivision, together with the provisions for its design and improvement, is consistent with the general plan and any applicable specific plan; The proposed project involves the subdivision of an existing 100,188 square -foot (2.3 gross acre) lot developed with an existing single-family residence into two lots for the future development of a new single-family residence on the newly created lot. Proposed Parcel 1 is 48,352 square feet (1.11 gross acres) and proposed Parcel 2 is 51,836 square feet (1.19 gross acres). The property is zoned Rural Residential (RR), and the underlying General Plan land use designation is also named Rural Residential. The development of a single-family residence on Parcel 2 will be processed through a Development Review application for compliance with the City's General Plan, City Design Guidelines and development standards. The project will provide additional homeownership opportunities of single-family housing that will be compatible with the surrounding development. The project site is not part of any theme area, specific plan, community plan, boulevard or planned development. 2 PC Resolution No.2026-XX Page 23 of 70 b. The site is physically suitable for the type and proposed density of development; The proposed subdivision will not interfere with the use and enjoyment of neighboring existing or future developments because the use of each lot is for a single-family home and the surrounding uses are also single- family homes. The maximum allowed density for the Rural Residential general plan land use designation and zoning district is one dwelling unit per gross acre (1 DU/Acre). Therefore, with a 2.3-acre lot, the proposed project is in compliance with the City's General Plan with regards to density. Also, the proposed location of the building pads and footprints are in compliance with the development standards. C. The design of the subdivision or the proposed improvements will not cause substantial environmental damage or injure fish or wildlife or their habitat; An initial study was prepared and it was determined that the proposed project qualifies for a Mitigated Negative Declaration. With the proposed mitigation measures, the project will not have a significant effect on the environment. In accordance to the provisions of Section 15070 of the CEQA guidelines, the City prepared and filed a Notice of Availability and Intent to Adopt a Mitigated Negative Declaration for the project on August 12, 2026, with the Los Angeles County Clerk. Pursuant to CEQA Section 15015, the public review period for the Mitigated Negative Declaration began August 12, 2026, and ended September 1, 2026. d. The design of the subdivision or type of improvements will not cause serious public health or safety problems; For the future development of the new single-family residence, grading shall be constructed, operated, and maintained in accordance with the recommendations contained in a preliminary geotechnical investigation to assure that geotechnical stability is maintained or increased. Detailed drainage and hydrology studies shall be completed, including the potential for debris flows, and the proposed conditions of approval will likely prevent any significant increases in erosion and flood hazards. Before the issuance of any City permits, the proposed project is required to comply with all conditions within the approved resolution, Building and Safety Division, Public Works Department, and Los Angeles County Fire Department requirements. Through the permit and inspection process, the referenced agencies will ensure that the proposed project is not detrimental to the public health, safety or welfare or materially injurious to the properties or improvements in the vicinity. e. The design of the subdivision or type of improvements will not conflict with easements, acquired by the public at large for access through or use of, property within the proposed subdivision. 3 PC Resolution No.2026-XX Page 24 of 70 The proposed subdivision will not interfere with easements, vehicular or pedestrian movements, such as access or other functional requirements of a single-family residence because the proposed parcels will comply with the requirements for driveway widths. f. The discharge of sewage from the proposed subdivision into the community sewer system would not result in violation of existing requirements prescribed by the California Regional Water Quality Control Board; The proposed subdivision will not violate any requirement of the California Regional Water Quality Control Board. The project will be connecting to the existing public sewer system which is in compliance with the California Regional Water Quality Control Board. g. A preliminary soils report or geologic hazard report does not indicate adverse soil or geologic conditions; and For the future development of the new single-family residence, grading shall be constructed, operated, and maintained in accordance with the recommendations contained in a preliminary geotechnical investigation to ensure that geotechnical stability is maintained or increased. h. The proposed subdivision is consistent with all applicable provisions of the City's Subdivision Ordinance, the Development Code, and the Subdivision Map Act. The proposed subdivision is consistent with the City's Subdivision Ordinance, Subdivision Map Act, and applicable Development Code. In addition, the development of a new single-family residence on the newly created lot will be processed through a Development Review application for compliance with the City's development standards. 2. Based on the findings and conclusions set forth herein, the Planning Commission hereby recommends that the City Council approve Tentative Parcel Map No. 83773, subject to the following conditions and the attached Standard Conditions of Approval: a. GENERAL 1. The following Conditions of Approval, including the Standard Conditions of Approval attached hereto, shall be binding on and enforceable against, and, whenever used herein, the terms "applicant", "owner", and/or "applicant/owner" shall mean and refer to, each of the following: the project applicant, Pete Volbeda, the owner(s), Arun Jain, and tenants(s) of the property, and each of their respective successors and assigns. 4 PC Resolution No.2026-XX Page 25 of 70 2. This approval shall not be effective for any purpose until the applicant/owner of the property involved has filed, within twenty-one (21) days of approval of this Tentative Parcel Map No. 83773, Case No. PL2022-119, at the City of Diamond Bar Community Development Department, an affidavit stating that the applicant/owner is aware of and agrees to accept all the conditions of this approval. Further, this approval shall not be effective until the applicant pays the remaining City processing fees. 3. Within five days of this approval, the subdivider/applicant shall pay to the City, the Department of Fish and Wildlife fee pursuant to Section 711.4 of the Fish and Game Code. 4. The subdivision shall comply with the Conditions of Approval attached hereto and referenced herein. 5. The development of a new single-family residence on the new lot shall be submitted for review and approval of a Development Review application and shall comply with the City's Development Code. 6. Prior to any use of the project site being commenced thereon, all conditions of approval shall be completed. 7. The project site shall be maintained and operated in full compliance with the conditions of approval and all laws, or other applicable regulations. 8. Pursuant to Government Code Section 66020, the Applicant is informed that the 90-day period in which the Applicant may protest the fees, dedications, reservation or other exaction imposed on this approval through the conditions of approval has begun. 9. Standard Conditions. The applicant shall comply with the standard development conditions attached hereto. b. TENTATIVE PARCEL MAP CONDITIONS 1. Prior to the recordation of the final map, the development shall comply with the specific requirements of Chapter 21.30 (Subdivision Design and Improvement Requirements) and Chapter 21.34 (Improvement Plans and Agreements) of the Diamond Bar City Code, as applicable. Final map approval will not be granted unless the map is in substantial compliance with Tentative Parcel Map No. 83773 including all conditions, and the applicant has entered into a subdivision improvement agreement to the satisfaction of the City Attorney. 5 PC Resolution No.2026-XX Page 26 of 70 2. The development shall secure compliance with the requirements of the Subdivision Ordinance and the General Plan and shall comply with the Conditions of Approval attached hereto and referenced herein. 3. This approval of Tentative Parcel Map No. 83773, Case No. PL2022- 119 expires three years from the date of approval if the use has not been exercised as defined per Diamond Bar City Code Section (DBCC) 21.20.140. The applicant may request for a time extension if such request submitted to the City in writing is no less than 30 days prior to the approval's expiration date, subject to DBCC Section 21.20.150 for City Council approval. 4. Prior to the issuance of a grading permit, the development shall comply with the Mitigation Monitoring and Reporting Program for the Mitigated Negative Declaration. All required mitigation monitoring fees shall be deposited with the City 90 days. All costs related to the ongoing monitoring shall be secured from the applicant and received by the City prior to the approval of the final map. 5. Approval of the Tentative Parcel Map is for subdivision of land only. No land use or development entitlements are expressed or implied. 6. The development shall provide parcels, easements or rights -of -way for private streets, water supply and distribution systems, sewage disposal systems, storm drainage facilities, solid waste disposal and public utilities providing electric, gas, and telecommunications services. 7. All utilities shall be installed underground in compliance with DBCC Section 21.30.110. 8. The design of the subdivision shall provide, to the extent feasible, for future passive or natural heating or cooling opportunities in the subdivisions, in compliance with Subdivision Map Act Section 66473.1. 9. Prior to final parcel map approval, the subdivider shall pay a parkland dedication in lieu fee for park and recreational purposes in the amount of $47,600, which equals the parkland obligation derived from the formula in DBCC Section 21.32.040(C) times the average per -acre fair market value for the appropriate park planning area. For the purposes of determining the required fee, the term "fair market value" shall mean the market value of the land as determined by the City staff, and approved by the Commission or Council, prior to or at tentative map approval. 10. Approval of Tentative Parcel Map No. 83773 shall not be interpreted as repealing, abrogating, or annulling any private easement, covenant, or dual restriction imposed on the subject property. The Planning Commission shall: 6 PC Resolution No.2026-XX Page 27 of 70 (a) Certify to the adoption of this Resolution; and (b) Forthwith transmit a certified copy of this Resolution, by certified mail, to: Arun Jain, 23901 Ridge Line Road, Diamond Bar, CA 91765, and Pete Volbeda, 215 N. 2nd Avenue Suite B, Upland, CA 91786. APPROVED AND ADOPTED THIS 8TH DAY OF SEPTEMBER 2026, BY THE PLANNING COMMISSION OF THE CITY OF DIAMOND BAR. IN Brian Worthington, Chairperson I, Greg Gubman, Planning Commission Secretary, do hereby certify that the foregoing Resolution was duly introduced, passed, and adopted, at a regular meeting of the Planning Commission held on the 8th day of September, 2026, by the following vote: AYES: Commissioners: NOES: Commissioners: ABSENT: Commissioners: ABSTAIN: Commissioners: /Gr9926*19 Greg Gubman, Secretary 7 PC Resolution No.2026-XX Page 28 of 70 �PC�T I I I I COMMUNITY DEVELOPMENT DEPARTMENT w �Fi'i�Rly '1tiU� 1 tyg9 � STANDARD CONDITIONS USE PERMITS, COMMERCIAL AND RESIDENTIAL NEW AND REMODELED STRUCTURES PROJECT #: Tentative Parcel Map No. 83773, Case No. PL2022-119 SUBJECT: To subdivide an existing 100,188 square -foot (2.3 gross acre) lot into two separate lots for the development of a single-family residence on the newly created lot PROPERTY Arun Jain, 23901 Ridge Line Road, Diamond Bar, CA 91765 OWNER: APPLICANT: Pete Volbeda, 215 N 2nd Avenue, Suite B, Upland, CA 91786 LOCATION: 23901 Ridge Line Road, Diamond Bar, CA 91765 ALL OF THE FOLLOWING CONDITIONS APPLY TO YOUR PROJECT. APPLICANT SHALL CONTACT THE PLANNING DIVISION AT (909) 839-7030, FOR COMPLIANCE WITH THE FOLLOWING CONDITIONS: A. GENERAL REQUIREMENTS The applicant shall defend, indemnify, and hold harmless the City, and its officers, agents and employees, from any claim, action, or proceeding to attack, set -aside, void or annul the approval of the Project. In the event the City and/or its officers, agents and employees are made a party of any such action: (a) Applicant shall provide a defense to the City defendants or at the City's option reimburse the City its costs of defense, including reasonable attorneys fees, incurred in defense of such claims. (b) Applicant shall promptly pay any final judgment rendered against the City defendants. (c) The City shall promptly notify the applicant of any claim, action of proceeding, and shall cooperate fully in the defense thereof. 2. Within thirty (30) days of this approval, Applicant shall execute and file with the City an affidavit indicating full understanding and concurrence with the approval 8 PC Resolution No.2026-XX Page 29 of 70 and all conditions of approval; and pay all remaining outstanding City processing fees, school fees and fees for the review of submitted reports [DBCC Section 22.66.020]. 3. Within three days of this project's approval, the subdivider/applicant shall remove the public hearing notice board. 4. The project site shall be maintained and operated in full compliance with the conditions of approval and all laws, or other applicable Federal, State, or City regulations. 5. The applicant shall comply with all applicable requirements of City Planning, Building and Safety Divisions, Public Works Department, and the Los Angeles County Fire Department. 6. City's approval of the proposed project shall not waive the applicant's obligation to comply with all applicable sections of the Development Code, all other applicable City Ordinances, and any applicable Specific Plan. B. FEES/DEPOSITS Prior to final parcel map approval as required by the City, applicant shall pay development fees (including but not limited to Planning, Building and Safety Divisions, and Public Works Department) at the established rates. In addition, the applicant shall pay all remaining prorated City project review and processing fees prior to final parcel map approval. 2. Prior to any plan check, all deposit accounts for the processing of this project shall have no deficits. APPLICANT SHALL CONTACT THE PUBLIC WORKS/ENGINEERING DEPARTMENT AT (909) 839-7040, FOR COMPLIANCE WITH THE FOLLOWING CONDITIONS: A. GENERAL A title report/guarantee showing all fee owners, interest holders, and nature of interest shall be submitted for final map plan check. Prior to final map approval, applicant shall submit an updated title report/guarantee and subdivision guarantee ten (10) business days. 2. Any existing easement for open space, utilities, riding and hiking trails shall be relocated and/or grading performed, as necessary, to provide, for the portion within the project site, practical access for the intended use. 3. A permit from the Los Angeles County Public Works Department shall be required for connection to its facilities. 4. Prior to final map approval, applicant shall submit written certifications to the City that all utility services and any other service related to the site shall be 9 PC Resolution No.2026-XX Page 30 of 70 available to serve the proposed project. Such letters shall be issued by the district, utility and cable television company, within ninety (90) days prior to final map approval. 5. All identified geologic hazards within the tentative parcel map boundaries which cannot be eliminated as approved by the City Engineer shall be indicated on the final map as "Restricted Use Area" subject to geologic hazard. The applicant shall dedicate to the City the right to prohibit the erection of buildings or other structures within such restricted use areas shown on the final map. 6. Easements and the utility companies, for public utility and public services purposes shall be offered and shown on the final map for dedication to the City. 7. After the final map recordation, applicant shall submit to the Public Works/Engineering Department, at no cost to the City, a full size of electronic copy of the recorded map. Final approval of the public or private improvements shall not be given until the copy of the recorded map is received by the Public Works/Engineering Department 8. All activities/improvements for the proposed Tentative Parcel Map shall be wholly contained within the boundaries of the map. Should any off -site activities/improvements be required, approval shall be obtained from the affected property owner and the City as required by the City Engineer. 9. Applicant shall pay the deposits required for plan check, review, and inspection to a separate engineering trust deposit where charges can be drawn by the City or its representatives for services rendered. Charges shall be on an hourly basis and shall include any City administrative costs. 10. Prior to final map approval, applicant shall submit recorded document(s) from the Diamond Bar Country Estates Association indicating the project will have proper/adequate right -of -entry to the subject site. B. GRADING No grading or any staging or construction shall be performed prior to final map approval by the City Council and map recordation. IIIIII:K Easements for public utilities and public services purpose shall be offered and shown on the detailed site plan for affected utility company. 2. Prior to final map approval, Will Serve Letters shall be submitted to the City from all utilities such as, but not limited to, Los Angeles County Sanitation Districts, phone, gas, water, electric, and cable. Such letters shall state that adequate facilities are or will be available to serve the proposed project. 10 PC Resolution No.2026-XX Page 31 of 70 3 Cl Underground utilities shall not be constructed within the drip line of any mature tree except as approved by a registered arborist. The sanitary sewer system serving the parcels shall be connected to the Los Angeles County maintained sewer system. Said system shall be of the size, grade and depth approved by the City Engineer, the County Sanitation District and Los Angeles County Public Works Department. END 11 PC Resolution No.2026-XX Page 32 of 70 I' , NOTICE OF AVAILABILITY AND INTENT TO ADOPT MITIGATED NEGATIVE DECLARATION City of Diamond Bar, 21810 Copley Drive, Diamond Bar, CA 91765 (909) 839-7030 NOTICE: Pursuant to the provisions of the California Environmental Quality Act (CEQA — Public Resources Code, Section 21100 et. Seq.), the City of Diamond Bar has determined that the project referenced hereinafter will not have a significant effect on the environment. A draft Mitigated Negative Declaration has been prepared for review and approval in connection with project approvals and conditions of approval that the City proposes to impose on the project. PROJECT TITLE: Tentative Parcel Map No. 83773 (Planning No. PL2022-119) PROJECT ADDRESS: 23901 Ridge Line Road, Diamond Bar, CA 91765 PROJECT DESCRIPTION: The applicant is requesting City approval to subdivide an existing 100,188 square -foot (2.3 gross acre) lot constructed with an existing single-family residence into two lots for the future development of a new single-family residence on the newly created lot. Proposed Parcel 1 is 48,352 square feet (1.11 gross acres) and proposed Parcel 2 is 51,836 square feet (1.19 gross acres). The existing single-family residence will remain on proposed Parcel 1 and a new single-family residence will be proposed on proposed Parcel 2 at a future time. The property is zoned Rural Residential (RR), and the underlying General Plan land use designation is also named Rural Residential. PROPERTY OWNER: Arun Jain, 23901 Ridge Line Road, Diamond Bar, CA 91765 APPLICANT: Pete Volbeda, 215 N 2nd Avenue Suite B, Upland, CA 91786 A copy of the Initial Study, documenting reasons to support the findings that said project would not have a significant effect which contains mitigation measures, to avoid potentially significant effects, is attached hereto for public review and available at the Planning Division. An Environmental Impact Report is not required for this project. Environmental Determination: Pursuant to the provisions of the California Environmental Quality Act (CEQA), Section 15070, the City prepared an Initial Study and Mitigated Negative Declaration for this project. Pursuant to CEQA Section 15105, the public review period for the Mitigated Negative Declaration begins August 12, 2026 and ends September 1, 2026. TIME OF HEARING: 6:30 p.m. (or as soon thereafter that the matter can be heard) DATE OF PUBLIC HEARING: Tuesday, September 8, 2026 LOCATION: Diamond Bar City Hall — Windmill Community Room 21810 Copley Drive Diamond Bar, CA 91765 CASE MATERIALS are available for review between Monday through Thursday and 7:30 a.m. to 4:30 p.m. Community Development Department/Planning Division 91765. the hours of 7:30 a.m. and 5:30 p.m. on Friday, at the City of Diamond Bar, , 21810 Copley Dr., Diamond Bar, CA O:\Tentative Maps\TPM 83773 23901 Ridge Line PL2022-119\CEQA Page 33 of 70 CITY OF DIAMOND BAR INITIAL STUDY ENVIRONMENTAL CHECKLIST FORM CITY OF DIAMOND BAR - 21825 COPLEY DRIVE - DIAMOND BAR, CA 91765 - TEL. (909) 839-7030 Project File: Tentative Parcel Map No. 83773 (Planning No. PL2022-119) 2. Lead Agency Name and Address: City of Diamond Bar, 21810 Copley Drive, Diamond Bar, CA 91765 3. Contact Person and Phone Number: Mayuko Nakajima, Senior Planner (909)-839-7033 4. Project location: 23901 Ridge Line Road, Diamond Bar, CA 91765 (APN: 8713-004-016) 5. Project Sponsor's Name and Address: Arun Jain, 23901 Ridge Line Road, Diamond Bar, CA 91765 6. General Plan Designation: Rural Residential (RR) 7. Zoning: Rural Residential (RR) 8. Description of project: (Describe the whole action involved, including but not limited to later phases of the project, and any secondary, support, or off -site features necessary for its implementation. Attach additional sheets if necessary) The applicant is requesting City approval to subdivide an existing 100,188 square - foot (2.3 gross acre) lot constructed with an existing single-family residence into two lots for the future development of a new single-family residence on the newly created lot. Proposed Parcel 1 is 48,352 square feet (1.11 gross acres) and proposed Parcel 2 is 51,836 square feet (1.19 gross acres). The existing single-family residence will remain on proposed Parcel 1 and a new single-family residence will be proposed on proposed Parcel 2 at a future time. The property is zoned Rural Residential (RR), and the underlying General Plan land use designation is also named Rural Residential. The average slope of the subject property is 32 percent. This project would have been categorically exempt from CEQA under Article 19, Section 15315, Class 15 (Minor Land Divisions) of the CEQA Guidelines, except for the fact that the average slope of the property is greater than 20 percent. The proposed subdivision is in conformance with the General Plan and zoning regulations, no variances or exceptions are proposed, and all public services and utilities including water supply are available to serve the project. The project site is located within The Diamond Bar Country Estates ("The Country Estates"), a gated residential community served by fully improved private streets and surrounded by residential development. There are no agricultural activities on or near the proposed project site. The subject property has six protected trees on -site but no protected trees are proposed for removal as part of the subdivision. The proposed project does not involve long-term Page 34 of 70 Initial Study for City of Diamond Bar Tentative Parcel Map No. 83036 (Planning Case No. PL2021-46) Page 2 changes to land use or other growth -inducing actions that could impact compliance with or implementation of the Air Quality Management Plan. The proposed project is not expected to generate potentially significant greenhouse gases in that the future construction and occupancy of a single-family residence (which would be enabled by the proposed subdivision) would not exceed greenhouse gas significance thresholds. Upon the completion of the environmental analysis, it was determined that, as conditioned, the proposed project would have less than a significant effect on the environment. 9. Surrounding land uses and setting: (Briefly describe the project's surroundings) North: Single -Family Residence in RR (Rural Residential) zone South: Single -Family Residence in RR (Rural Residential) zone West: Single -Family Residence in RR (Rural Residential) zone East: Single -Family Residence in RR (Rural Residential) zone 10. Other agencies whose approval is required (e.g., permits, financing approval, or participation agreement): None. 11. Have California Native American tribes traditionally and culturally affiliated with the project area requested consultation pursuant to Public Resources Code section 21080.3.1? If so, is there a plan for consultation that includes, for example, the determination of significance of impacts to tribal cultural resources, procedures regarding confidentiality, etc.? Yes, the Gabrieleno Band of Mission Indians — Kizh Nation requested consultation; refer to Tribal Cultural Resources section. NOTE: Conducting consultation early in the CEQA process allows tribal governments, lead agencies, and project proponents to discuss the level of environmental review, identify and address potential adverse impacts to tribal cultural resources, and reduce the potential for delay and conflict in the environmental review process. (See Public Resources Code section 21080.3.2.) Information may also be available from the California Native American Heritage Commission's Sacred Lands File per Public Resources Code section 5097.96 and the California Historical Resources Information System administered by the California Office of Historic Preservation. Please also note that Public Resources Code section 21082.3(c) contains provisions specific to confidentiality. ENVIRONMENTAL FACTORS POTENTIALLY AFFECTED The environmental factors checked below would be potentially affected by this project, involving at least one impact that is a "Potentially Significant Impact," "Potentially Significant Impact Unless Mitigation Incorporated," or "Less Than -Significant -Impact" as indicated by the checklist on the following pages. Aesthetics Biological Resources Greenhouse Gas Emissions Land Use / Planning Population / Housing Transportation Wildfire DETERMINATION ( ) Agriculture & Forestry Resources (X) Cultural Resources (X) Tribal Cultural Resources () Hazards & Hazardous Materials () Mineral Resources () Public Services () Utilities & Service Systems () Energy ( ) Air Quality (X) Geology & Soils () Hydrology & Water Quality () Noise () Recreation () Mandatory Findings of Significance Rev 02/26/2026 Page 35 of 70 Initial Study for City of Diamond Bar Tentative Parcel Map No. 83773 (Planning Case No. PL2022-119) Page 3 On the basis of this initial evaluation: () I find that the proposed project COULD NOT have a significant effect on the environment. A NEGATIVE DECLARATION will be prepared. (X) I find that although the proposed project could have a significant effect on the environment, there will not be a significant effect in this case because revisions in the project have been made by, or agreed to, by the project proponent. A MITIGATED NEGATIVE DECLARATION will be prepared. () I find that the proposed project MAY have a significant effect on the environment, and an ENVIRONMENTAL IMPACT REPORT is required. () I find that the proposed project MAY have a "Potentially Significant Impact" or "Potentially Significant Unless Mitigated" impact on the environment, but at least one effect 1) has been adequately analyzed in an earlier document pursuant to applicable legal standard and 2) has been addressed by mitigation measures based on the earlier analysis as described on attached sheets. An ENVIRONMENTAL IMPACT REPORT is required, but it must analyze only the effects that remain to be addressed. () I find that although the proposed project could have a significant effect on the environment, because all potentially significant effects 1) have been analyzed adequately in an earlier EIR or NEGATIVE DECLARATION pursuant to applicable standards, and 2) have been avoided or mitigated pursuant to that earlier EIR or NEGATIVE DECLARATION, including revisions or mitigation measures that are imposed upon the proposed project, nothing further is required. Prepared By: Mayuko Nakaiima Reviewed By: Greg Gubman Date: 7/28/2026 Date: 7/31 /2026 Rev 02/26/2026 Page 36 of 70 Initial Study for City of Diamond Bar Tentative Parcel Map No. 83773 (Planning Case No. PL2022-119) Page 4 EVALUATION OF ENVIRONMENTAL IMPACTS Potentially Less Than Less Than No Impact Issues and Su ortin Information Sources: �� � Significant Significant Significant Impact with Impact Mitigation Incorporated 1. AESTHETICS. Would the project: a) Have a substantial adverse effect on a scenic () () (✓) ( ) vista? b) Substantially damage scenic resources, including, () () () (✓) but not limited to, trees, rock outcroppings, and historic buildings within a State Scenic Highway? c) In nonurbanized areas, substantially degrade the () () (✓) ( ) existing visual character or quality of public views of the site and its surroundings? (Public views are those that are experienced from publicly accessible vantage point). If the project is in an urbanized area, would the project conflict with applicable zoning and other regulations governing scenic quality? d) Create a new source of substantial light or glare, () () (✓) ( ) which would adversely affect day or nighttime views in the area? 1a) Impact Discussion: The project site is located within an existing gated residential community, surrounded by residential development. The proposed project will have a less than significant impact on the scenic vistas that exist in The Country Estates such as city lights, foothills, and canyons. The proposed parcels are located along Ridge Line Road next to existing parcels with developed with single-family residences and will not impact the vistas of existing homes. 1 b) Impact Discussion: No officially designated State scenic routes or highways occur near the project site. 1c) Impact Discussion: The project site is located within an existing gated residential community, surrounded by residential development and therefore will be compatible with the surrounding uses. The project proposes to subdivide an existing lot into two lots for the development of a single-family residence on the newly created lot, and an existing single-family residence will be preserved on the remaining lot. The development of single-family homes will be subject to the City's Development Code standards and design guidelines, as well as the architectural standards established by the Homeowners Association. As such, the proposed project will not degrade the existing visual character or quality of the site and its surrounding. 1d) Impact Discussion: Light emitted from the future development of a new single-family residence will be consistent with the existing residential uses that surround the project site. As part of the development of the single-family residences, lighting will be included around the building and interior of the building. To reduce the impact on adjacent properties, any new exterior lighting will be directed away or shielded so that it is confined within the boundaries of the property pursuant to Development Code standards. Compliance with the Development Code will result in nonsignificant light and glare impacts. Rev 02/26/2026 Page 37 of 70 Initial Study for City of Diamond Bar Tentative Parcel Map No. 83773 (Planning Case No. PL2022-119) Page 5 Issues and Supporting Information Sources: pp � Potentially Significant Less Than Significant Less Than Significant No Impact Impact with Impact Mitigation Incorporated 2. AGRICULTURE AND FORESTRY RESOURCES. Would the project: () () () (✓) a) Convert Prime Farmland, Unique Farmland, or Farmland of Statewide Importance (Farmland), as shown on the maps prepared pursuant to the Farmland Mapping and Monitoring Program of the California Resources Agency, to non-agricultural use? b) Conflict with existing zoning for agricultural use, or ( ) () () (✓) a Williamson Act contract? c) Conflict with existing zoning for, or cause re- ( ) () () (✓) zoning of, forest land (as defined in Public Resources Code section 12220 (g), timberland (as defined by Public Resources Code section 4526), or timberland zoned Timberland Production (as defined by Government Code Section 51104 (g))? d) Result in the loss of forest land or conversion of () () () (✓) forest land to non -forest use? e) Involve other changes in the existing environment, () () () (✓) which, due to their location or nature, could result in conversion of Farmland, to non-agricultural use or conversion of forest land to non -forest use? 2a) Impact Discussion: The project site is not designated as Prime Farmland, Unique Farmland or Farmland of Statewide Importance. There are no agricultural activities on or near the proposed project site. Project implementation would not result in the conversion of farmland to non- agricultural use. Therefore, the proposed project would have no impacts to farmlands. 2b) Impact Discussion: Implementation of the proposed project would not conflict with existing zoning for agricultural use, or a Williamson Act contract. Therefore, no impacts would result from the future construction or operation of the proposed project. 2c) Impact Discussion: There are no forestland, timberland or timberland zoned Timberland Production uses that are occurring on -site or in the immediate vicinity. Thus, the proposed project does not involve changes in the existing environment that could conflict with existing zoning or cause of rezoning of forestland, timberland, or timberland zoned Timberland Production. 2d) Impact Discussion: The subject property is not located within forest land, and will thus have no impact in this category. 2e) Impact Discussion: There are no farmland uses that are occurring on -site or in the immediate vicinity. Thus, the proposed project does not involve changes in the existing environment that could result in conversion of Farmland to non-agricultural uses. Rev 02/26/2026 Page 38 of 70 Initial Study for City of Diamond Bar Tentative Parcel Map No. 83773 (Planning Case No. PL2022-119) Page 6 Potentially Less Than Less Than No Impact Issues and Supporting Information Sources: pp � Significant Significant Significant Impact with Impact Mitigation Incorporated 3. AIR QUALITY. Would the project: a) Conflict with or obstruct implementation of the () () (✓) ( ) applicable air quality plan? b) Result in a cumulatively considerable net increase () () (✓) ( ) of any criteria pollutant for which the project region is non -attainment under an applicable Federal or State ambient air quality standard? c) Expose sensitive receptors to substantial pollutant () () (✓) ( ) concentrations? d) Result in other emissions (such as those leading () () (✓) ( ) to odors) adversely affecting a substantial number of people? 3a) Impact Discussion: The proposed project does not involve long-term changes to land use or other growth -inducing actions that could impact compliance with or implementation of the Air Quality Management Plan. The future construction of a single-family residence will not exceed thresholds for maximum daily construction emissions for pollutants and no mitigation is required. After the completion of the construction activities, it is not anticipated that there will be an increase in emissions from operational activities of a new single-family residence. Also, a two -lot subdivision falls well below the South Coast Air Quality Management District Air Quality Handbook Threshold for criteria pollutants. Therefore, impacts from operational activities would be less than significant. 3b) Impact Discussion: See response 3a above. 3c) Impact Discussion: See response 3a above. 3d) Impact Discussion: The proposed project will result in the future development of a new single- family residence. The proposed project is not expected to generate objectionable odors affecting a substantial number of people. Construction activity associated with the future development of a new single-family residence may generate detectable odors from heavy-duty equipment exhaust. However, this impact would be short-term in nature (only during construction activities) and cease upon project completion. Rev 02/26/2026 Page 39 of 70 Initial Study for City of Diamond Bar Tentative Parcel Map No. 83773 (Planning Case No. PL2022-119) Page 7 Issues and Supporting Information Sources: �� � Potentially Significant Less Than Significant Less Than Significant No Impact Impact with Mitigation Impact Incorporated 4. BIOLOGICAL RESOURCES. Would the project: a) Have a substantial adverse effect, either directly () () (✓) () or through habitat modifications, on any species identified as a candidate, sensitive, or special status species in local or regional plans, policies, or regulations, or by the California Department of Fish and Game or U.S. Fish and Wildlife Service? b) Have a substantial adverse effect on riparian () () () (✓) habitat or other sensitive natural community identified in local or regional plans, policies, or regulations or by the California Department of Fish and Game or US Fish and Wildlife Service? c) Have a substantial adverse effect on State or () () () (✓) federally protected wetlands (including, but not limited to, marsh, vernal pool, coastal, etc.) through direct removal, filling, hydrological interruption, or other means? d) Interfere substantially with the movement of any () () () (✓) native resident or migratory fish or wildlife species or with established native resident or migratory wildlife corridors, or impede the use of native wildlife nursery sites? e) Conflict with any local policies or ordinances () () (✓) ( ) protecting biological resources, such as a tree preservation policy or ordinance? f) Conflict with the provisions of an adopted Habitat () () () (✓) Conservation Plan, Natural Community conservation Plan, or other approved local, regional, or State habitat conservation plan? 4a) Impact Discussion: The project site is in an urbanized area, located within an existing gated residential community, surrounded by residential development. The property has six protected trees on -site but no protected trees are proposed for removal with the proposed subdivision. The subject property is already disturbed and past development activity on the subject property and along the Country's roadway network has eradicated habitat in areas immediately adjacent to the roads. According to the Resource Conservation Element of the City's General Plan, the project site is not identified as having species identified as a candidate, sensitive, or special status. Therefore, the proposed project would not result in significant adverse impact to Federal or State listed or other designated species. 4b) Impact Discussion: As previously stated, the project site is located within an existing gated residential community. No riparian habitat or sensitive natural communities exist on -site. According to the Resource Conservation Element of the City's General Plan, the project site is not identified as having sensitive environmental resources. Rev 02/26/2026 Page 40 of 70 Initial Study for City of Diamond Bar Tentative Parcel Map No. 83773 (Planning Case No. PL2022-119) Page 8 4c) Impact Discussion: No federally protected wetlands occur on -site. Therefore, implementation of the proposed project would not result in any impacts in this regard. 4d) Impact Discussion: There may be native resident or migratory wildlife species in the canyons within The Country Estates, and nesting opportunities or raptor/wildlife foraging opportunities on the project site have been largely eradicated. According to the Resource Conservation Element of the City's General Plan, the project site is not identified as an area to serve as a wildlife movement corridor. Therefore, implementation of the proposed project would not result in any impacts in this regard. 4e) Impact Discussion: The property has six protected trees on -site but no protected trees are proposed for removal with the proposed subdivision. If trees are proposed for removal during construction of the proposed single-family residence, the City's Tree Preservation Ordinance requires the applicant to obtain a Tree Permit with appropriate mitigation. In light of these factors, the proposed project does not conflict with any local policies or ordinances protecting biological resources. 4f) Impact Discussion: There are no adopted Habitat Conservation Plan, Natural Community Conservation Plans or other approved local, regional, or state habitat conservation plans applicable to the project area. Therefore, the proposed project would not result in impacts in this regard. Potentially Less Than Less Than No Impact Issues and Su ortin Information Sources: �� � Significant Significant Significant Impact with Impact Mitigation Incorporated 5. CULTURAL RESOURCES. Would the project: a) Cause a substantial adverse change in the ( ) () () (✓) significance of a historical resource as defined in § 15064.5? b) Cause a substantial adverse change in the ( ) (✓) () ( ) significance of an archaeological resource pursuant to § 15064.5? c) Disturb any human remains, including those ( ) (✓) () ( ) interred outside of dedicated cemeteries? 5a) Impact Discussion: The proposed project may have a significant adverse impact if it would cause a substantial adverse change in the significance of a historical resource as defined in Section 15064.5 of the CEQA Guidelines. This section of the CEQA Guidelines defines a historical resource as one listed in or eligible for listing in the California Register of Historical Places (per state law), included in a local register of historical resources (as defined by state law) or identified as significant in an historical resource survey (meeting the requirements of state law) or determined by the lead agency (City of Diamond Bar) to be historically significant or significant in the architectural, engineering, scientific, economic, agricultural, educational, social, political, military, or cultural annals of California, provided the determination is supported by substantial evidence in light of the whole record. Generally, a resource shall be considered by the lead agency to be "historically significant" if the resource meets the criteria for listing on the California Register of Historical Places. In this case, the existing site is not listed in nor eligible for listing in the California Register of Historical Places, not listed in a local register of historical resources or identified as significant in a historical resource survey, nor has it been determined to be historically significant by the City because it does not meet the criteria for listing on the California Register of Rev 02/26/2026 Page 41 of 70 Initial Study for City of Diamond Bar Tentative Parcel Map No. 83773 (Planning Case No. PL2022-119) Page 9 Historical Places. Therefore, it does not meet the definition of a historical resource contained in Section 15064.5 of the CEQA Guidelines and would not result in any impacts in this regard. 5b) Impact Discussion: CEQA Guidelines Section 15064.5 and Public Resources Code Section 21083.2 provide that a project may have a significant effect on the environment if it causes a substantial adverse change in the significance of a historical resource or a unique archaeological resource and outline requirements for the treatment of archaeological resources if they are discovered during project implementation. It is not anticipated that any archaeological resources exist within the project site. However, in the event of accidental discovery of archaeological resources during ground -disturbing activities, the project would be required to comply with General Plan Resource Conservation Cultural and Historic Resources Policies, including Policy RC-P-42, Archaeological Resources, which provides procedures for the management of archaeological materials on -site during development projects. Policy RC-P-43 seeks to preserve discovered archaeological resources in place to maintain the relationship between the artifacts and their archaeological context, where feasible. Policy RC-P-44 provides that preservation can be achieved through measures such as avoidance and other protections. Should ground disturbing activities during construction encounter archaeological resources, incorporation of Mitigation Measure CUL-1 would establish procedures for halting construction, retaining a qualified archaeologist to evaluate any unanticipated discovery, and implementing appropriate treatment (such as avoidance, data recovery, or other measures) if a find is determined to be significant under CEQA. Through compliance with the General Plan Resource Conservation policies and the implementation of Mitigation Measure CUL-1, the project would not cause a substantial adverse change in the significance of an archaeological resource pursuant to CEQA Guidelines Section 15064.5. Therefore, impacts would be less than significant with mitigation incorporated. Mitigation Measure: CUL-1: Should archaeological resources (sites, features, or artifacts) be exposed during construction activities, all construction work shall immediately stop until a qualified archaeologist, meeting the Secretary of the Interior's Professional Qualification Standards, can evaluate the significance of the find and determine whether or not additional study is warranted. Depending upon the significance of the find, the archaeologist may simply record the find and allow work to continue. If the discovery proves significant under CEQA, additional work such as preparation of an archaeological treatment plan, testing, or data recovery may be warranted. 5c) Impact Discussion: It is not anticipated that human remains exist within the project site. However, in the event of accidental discovery of unanticipated human remains during ground - disturbing activities during construction, incorporation of Mitigation Measure CUL-2, provides procedures related to the treatment of the unanticipated discovery of human remains, would ensure that the project's potential impacts to buried remains would be reduced to less than significant levels. Mitigation Measure: CUL-2: In accordance with Section 7050.5 of the California Health and Safety Code, if human remains are found, the applicant or its construction contractor (through the on -site construction manager/contractor superintendent) shall notify the County Coroner within 24 hours of the discovery. No further excavation or disturbance of the site or any nearby area reasonably suspected to overlie adjacent remains shall occur until the County Coroner has determined, within Rev 02/26/2026 Page 42 of 70 Initial Study for City of Diamond Bar Tentative Parcel Map No. 83773 (Planning Case No. PL2022-119) Page 10 two working days of notification of the discovery, the appropriate treatment and disposition of the human remains. If the remains are determined to be Native American, the Coroner shall notify the NAHC in Sacramento within 24 hours. In accordance with California PRC, Section 5097.98, the NAHC must immediately notify those persons it believes to be the Most Likely Descendant (MLD) from the deceased Native American. The MLD shall complete their inspection within 48 hours of being granted access to the site. The MLD would then determine, in consultation with the property owner, the disposition of the human remains. Issues and Supporting Information Sources: �� � Potentially Significant Impact Less Than Significant with Mitigation Incorporated Less Than Significant Impact No Impact 6. ENERGY. Would the project: a) Result in potentially significant environmental () () (✓) ( ) impact due to wasteful, inefficient, or unnecessary consumption of energy resources, during project construction or operation? b) Conflict with or obstruct a state or local plan for () () (✓) ( ) renewable energy or energy efficiency? 6a) Impact Discussion: Energy consumption associated with the supply and conveyance of water used for dust control as well as electricity used for powering lighting, electronic equipment, and other construction activities is assumed to be negligible for the future construction of one single- family residence. 6b) Impact Discussion: See response 6a above. Potentially Less Than Less Than No Impact Issues and Su ortin Information Sources: �� � Significant Significant Significant Impact with Mitigation Impact Incorporated 7. GEOLOGY AND SOILS. Would the project: a) Directly or indirectly cause potential substantial adverse effects, including the risk of loss, injury, or death involving: i) Rupture of a known earthquake fault, as () () (✓) ( ) delineated on the most recent Alquist-Priolo Earthquake Fault Zoning Map issued by the State Geologist for the area or based on other substantial evidence of a known fault? Refer to Division of Mines and Geology Special Publication 42. ii) Strong seismic ground shaking? () () (✓) ( ) iii) Seismic -related ground failure, including () () () (✓) liquefaction? iv) Landslides? () () (✓) ( ) b) Result in substantial soil erosion or the loss of () () (✓) ( ) topsoil? Rev 02/26/2026 Page 43 of 70 Initial Study for City of Diamond Bar Tentative Parcel Map No. 83773 (Planning Case No. PL2022-119) Page 11 c) Be located on a geologic unit or soil that is () () (✓) ( ) unstable, or that would become unstable as a result of the project, and potentially result in on- or off -site landslide, lateral spreading, subsidence, liquefaction or collapse? d) Be located on expansive soil, as defined in Table () () (✓) ( ) 18-1-B of the Uniform Building Code (1994), creating substantial direct or indirect risks to life or property? e) Have soils incapable of adequately supporting the () () () (✓) use of septic tanks or alternative waste water disposal systems where sewers are not available for the disposal of wastewater? f) Directly or indirectly destroy a unique () (✓) () ( ) paleontological resource or site or unique geologic feature? 7a-i) Impact Discussion: No active faults are known to traverse the project site and the project site is not located within, or immediate adjacent to an Alquist-Priolo Earthquake Fault Zone. Therefore, rupture of a known earthquake fault would not occur within the project area. Adherence to standard engineering practices and design criteria relative to seismic and geologic hazards in accordance with the California Building Code (CBC) is required for any physical development. 7a-ii) Impact Discussion: Southern California has numerous active and potentially active faults that could produce strong ground shaking that could impact the project site. The City of Diamond Bar is in proximity to the San Andreas and Sierra Madre Fault zone. The California Building Code requires structural design and construction methods that minimize the effects of strong seismic ground shaking. The California Building Code requirements would be applied to the future construction of a single-family residence as standard conditions of project approval. 7a-iii) Impact Discussion: The project area is located within a portion of the City that is not subject to liquefaction. Therefore, project implementation is not anticipated to result in the exposure of people or structures to potential impacts related to seismic ground failure or liquefaction. 7a-iv) Impact Discussion: As required by the California Building Code, at the time of development for the construction of a single-family residence, the applicant is required to submit a detailed geotechnical investigation report that includes field exploration, laboratory testing and analyses. This report shall determine if the project site is suitable for the development of a new single-family residence. Therefore, impacts would be less than significant. 7b) Impact Discussion: The largest source of erosion, particularly in an urban environment is uncontrolled drainage during construction. Erosion potential during construction would be managed to the maximum extent practicable with Best Management Practices (BMPs). The future construction of a single-family residence would be required to be covered under the National Pollutant Discharge Elimination System (NPDES) General Construction Permit; therefore, construction BMPs would be implemented on the project site during future demolition and construction activities to minimize erosion impacts. Implementation of the construction -related BMPs would reduce potential construction -related impacts to the maximum extent feasible. The Rev 02/26/2026 Page 44 of 70 Initial Study for City of Diamond Bar Tentative Parcel Map No. 83773 (Planning Case No. PL2022-119) Page 12 operation of the project site would not cause the loss of topsoil or erosion because the site would be landscaped and paved. 7c) Impact Discussion: See response 7a(iv) above. 7d) Impact Discussion: See response 7a(iv) above. 7e) Impact Discussion: The project would be served by the sewer system, thus there is no impact on soils inadequately capable of supporting the use of septic tanks or alternative waste water disposal systems. 7f) Impact Discussion: The project site is located within an existing gated residential community. It is not located in an area likely to have unique paleontological resource or site or unique geologic features. However, the General Plan Resource Conservation Element's Cultural and Historic Resources policies include Policy RC-P-47, Paleontological Resources. Mitigation Measure GEO-1 implements Policy RC-P-47 by requiring work to halt, evaluation by a Qualified Paleontologist, and appropriate treatment and curation if unanticipated fossil materials are discovered during construction. Through compliance with General Plan Resource Conservation Element Policy RC-P-47 and implementation of GEO-1, the project would not directly or indirectly destroy a unique paleontological resource or unique geologic feature, and impacts would be less than significant with mitigation incorporated. Mitigation Measure: GEO-1: Should unanticipated fossil materials be discovered by the construction crew during the course of future development, construction activity should be halted in a 50-foot radius around the discovery. The project applicant or its construction contractor, through the on -site construction manager or contractor superintendent, shall notify a Qualified Paleontologist, who shall be retained to evaluate the discovery, determine its significance, and identify any additional mitigation or treatment that may be required. Work in the area can resume once the find is properly documented and authorization is given to continue with construction. Any scientifically significant paleontological resources found, including the initial unanticipated find (if it proves to be significant), should be prepared, identified, analyzed, and permanently curated in an approved repository (typically the Natural History Museum of Los Angeles). The cost of curation would be determined by the repository, and the costs of preparation and curation would be the responsibility of the project applicant. Issues and Supporting Information Sources: �� � Potentially Significant Impact Less Than Significant with Mitigation Incorporated Less Than Significant Impact No Impact 8. GREENHOUSE GAS EMISSIONS. Would the project: a) Generate greenhouse gas emissions, either () () (✓) ( ) directly or indirectly, that may have a significant impact on the environment? b) Conflict with an applicable plan, policy or regulation adopted for the purpose of reducing the emissions of greenhouse gases? () () (✓) ( ) 8a) Impact Discussion: The scientific consensus is that greenhouse gases (GHGs) generated by human activities contribute to climate change by increasing the Earth's natural greenhouse effect. Rev 02/26/2026 Page 45 of 70 Initial Study for City of Diamond Bar Tentative Parcel Map No. 83773 (Planning Case No. PL2022-119) Page 13 The gases concentrate in the Earth's atmosphere and trap heat by blocking some of the long - wave energy the Earth normally radiates back into space. Human activities that produce GHGs are the burning of fossil fuels (coal, oil and natural gas for heating and electricity, gasoline and diesel for transportation); methane from landfill wastes and raising livestock, deforestation activities; and some agricultural practices. These activities are increasing the greenhouse gases in the Earth's atmosphere and could be accelerating global climate change. Long-term environmental consequences in California could potentially include a reduction in water supply from the Sierra Nevada snow pack, which could result in a reduction in imported water, and public health problems due to degraded air quality and more intense summer heat. In 2005, in recognition of California's vulnerability to the effects of climate change, then Governor Schwarzenegger established Executive Order S-3-05 which set forth the following target dates by which Statewide emission of GHGs would be progressively reduced: (1) by 2010, reduce GHG emissions to 2000 levels; (2) by 2020, reduce greenhouse gas emissions to 1990 levels; and (3) by 2050, reduce GHG emissions to 80 percent below 1990 levels. In 2006, California passed the California Global Warming Solutions Act of 2006 (Assembly Bill 32 [AB32]; Division 25.5, Sections 38500 et seq., H&SC) requiring the California Air Resources Board (CARB) to design and implement emission limits, regulations, and other measures, such that feasible and cost-effective Statewide GHG emissions are reduced to 1990 levels by 2020 (representing an approximate 25 percent reduction in emissions). In June 2007, CARB directed staff to pursue 37 early actions for reducing GHG emissions under AB 32. The broad spectrum of strategies to be developed (e.g., low -carbon fuel standard, regulations for refrigerants with high -global warming potentials, guidance and protocols for local governments to facilitate GHG reductions, and green ports) reflects that the serious threat of climate change requires action as soon as possible. In accordance with AB 32, CARB developed the first Scoping Plan in 2008 to outline the State's strategy to achieve 1990 level emissions by year 2020. In May 2014, the CARB released and adopted the First Update to the Climate Change Scoping Plan to identify the next steps in reaching AB 32 goals and evaluate the progress that has been made between 2000 and 2012. A newer version of the Scoping Plan was then adopted by the CARB in December 2017 (entitled California's 2017 Climate Change Scoping Plan). Lastly, the most recent version of the Scoping Plan was adopted by the CARB in November 2022 (entitled Final 2022 Scoping Plan for Achieving Carbon Neutrality) (2022 Scoping Plan), which was designed to be consistent with the long-term GHG reduction targets embedded in AB 1279. Since adoption of the 2008 Scoping Plan and the subsequent updates in 2014, 2017, and 2022, State agencies have adopted programs identified in the plan, and the Legislature has passed additional legislation to achieve the GHG reduction targets. Statewide strategies to reduce GHG emissions include the Low Carbon Fuel Standard, California Appliance Energy Efficiency regulations, California Building Standards (e.g., CALGreen and the 2022 Building and Energy Efficiency Standards), zero carbon electricity by 2045, and changes in the corporate average fuel economy standards (e.g., Pavley I and California Advanced Clean Cars). Global climate change is not confined to a particular project area and is generally accepted as the consequence of global industrialization over the last 200 years. A typical project, even a very large one, does not generate enough greenhouse gas (GHG) emissions on its own to influence global climate change significantly; hence the issue of global climate change is, by definition, a cumulative environmental impact. The State of California, through its governor and legislature, has established a comprehensive framework for the substantial reduction of GHG emissions over the next 40-plus years. This will occur primarily through the implementation of AB 32 and Senate Bill 375 (SB 375), which will address GHG emissions on a statewide, cumulative basis. Rev 02/26/2026 Page 46 of 70 Initial Study for City of Diamond Bar Tentative Parcel Map No. 83773 (Planning Case No. PL2022-119) Page 14 The City of Diamond Bar Climate Action Plan adopted in 2019 reinforces the City's commitments to reduce GHG emissions. The City's Climate Action Plan introduces emissions targets for 2030 of 6.0 MTCO2e per capita and for 2040 of 4.0 MTCO2e per capita. Nevertheless, the currently proposed project is not expected to generate potentially significant greenhouse gases by subdividing an existing lot for the future construction of a new single-family residence. Therefore, no new significant impacts are anticipated and no mitigation measures are necessary at this time. 8b) Impact Discussion: See response 8a above. Issues and Supporting Information Sources: �� � Potentially Significant Less Than Significant Less Than Significant No Impact Impact with Mitigation Impact Incorporated 9. HAZARDS AND HAZARDOUS MATERIALS. Would the project: () () (✓) ( ) a) Create a significant hazard to the public or the environment through the routine transport, use, or disposal of hazardous materials? b) Create a significant hazard to the public or the () () (✓) ( ) environment through reasonably foreseeable upset and accident conditions involving the release of hazardous materials into the environment? c) Emit hazardous emissions or handle hazardous or () () () (✓) acutely hazardous materials, substances, or waste within 1/4 mile of an existing or proposed school? d) Be located on a site which is included on a list of () () () (✓) hazardous materials sites compiled pursuant to Government Code Section 65962.5 and, as a result, would it create a significant hazard to the public or the environment? e) For a project located within an airport land use () () () (✓) plan or, where such a plan has not been adopted, within two miles of a public airport or public use airport, would the project result in a safety hazard or excessive noise for people residing or working in the project area? f) Impair implementation of or physically interfere () () () (✓) with an adopted emergency response plan or emergency evacuation plan? g) Expose people or structures, either directly or () () (✓) ( ) indirectly, to a significant risk of loss, injury or death involving wildland fires? 9a) Impact Discussion: The proposed project would not create a significant hazard to the public or the environment from the routine transport, use, or disposal of hazardous materials. Small amounts of hazardous materials may be found in solvents and chemicals used for cleaning, Rev 02/26/2026 Page 47 of 70 Initial Study for City of Diamond Bar Tentative Parcel Map No. 83773 (Planning Case No. PL2022-119) Page 15 building maintenance, and landscaping. The materials would be similar to those found in common household projects or pesticides. Hazardous materials used in construction and operation of the proposed project would be subject to City, State, and Federal regulations, reducing impacts to a less than significant level. 9b) Impact Discussion: The proposed uses are not anticipated to result in the creation of health hazards following compliance with health and safety regulations. The proposed uses would not use, generate or dispose of hazardous materials in large quantities. As stated above, hazardous materials used in construction and operation of the proposed project would be subject to City, State, and Federal regulations, reducing impacts to a less than significant level. 9c) Impact Discussion: The proposed project would not involve the transport, use, handling, or disposal of notable quantities of hazardous materials, aside from normal household chemicals and landscaping applications. Therefore, the proposed project would not pose a health risk to nearby schools, and no significant impacts to schools would result from the future construction and operation of the development of a new single-family residence. 9d) Impact Discussion: The project site is located within an existing gated residential community, surrounded by residential development. The existing uses do not use, handle, or store hazardous materials. Future development of a new single-family residence would not create a significant hazard to the public or to the environment. Therefore, no impacts would occur in this regard. 9e) Impact Discussion: The project site is not located within an airport land use plan or within two miles of an airport. The nearest airport is Brackett Field Airport, which is approximately 7.2 miles northeast of the project site. No impacts would occur in this regard. 9f) Impact Discussion: Emergency vehicles would continue to have access to project related and surrounding roadways upon completion of a new single-family residence. The future development of a new single-family residence would not impact access to emergency response. In addition, the future development of a new single-family residence would not place temporary or permanent barriers on existing roadways or reconfigure existing roadways. Therefore, no impacts would result from the construction and operation of a future development of a new single-family residence. 9g) Impact Discussion: Most homes in The Country Estates are within the Very High Fire Hazard Severity zones. The project site is not at a greater risk than other homes within The Country, and is at less risk than homes abutting wildlands. In addition, at the time of development, a fuel modification plan is required and subject to the review and approval of the County of Los Angeles, Fire Department's Prevention Bureau - Forestry Division. Rev 02/26/2026 Page 48 of 70 Initial Study for City of Diamond Bar Tentative Parcel Map No. 83773 (Planning Case No. PL2022-119) Page 16 Issues and Supporting Information Sources: �� � Potentially Significant Less Than Significant Less Than Significant No Impact Impact with Mitigation Impact Incorporated 10. HYDROLOGY AND WATER QUALITY. Would the project. () () (✓) ( ) a) Violate any water quality standards or waste discharge requirements or otherwise substantially degrade surface or ground water quality? b) Substantially decrease groundwater supplies or () () (✓) ( ) interfere substantially with groundwater recharge such that the project may impede sustainable groundwater management of the basin? c) Substantially alter the existing drainage pattern of the site or area, including through the alteration of the course of a stream or river or through the addition of impervious surfaces, in a manner which would: i) result in substantial erosion or siltation on- or () () (✓) ( ) off -site? ii) substantially increase the rate or amount of () () (✓) ( ) surface runoff in a manner which would result in flooding on- or offsite; iii) create or contribute runoff water which would () () (✓) ( ) exceed the capacity of existing or planned stormwater drainage systems or provide substantial additional sources of polluted runoff; or iv) Impede or redirect flood flows? () () (✓) ( ) d) In flood hazard, tsunami, or seiche zones, risk () () () (✓) release of pollutants due to project inundation? e) Conflict with or obstruct implementation of a water () () (✓) ( ) quality control plan or sustainable groundwater management plan? 10a) Impact Discussion: The proposed project will not be allowed to violate any water quality standards or waste discharge requirements. The State Water Resource Control Board (SWRCB) has adopted a National Pollutant Discharge Elimination System (NPDES) General Permit for storm water discharges associated with future construction activity. Compliance with Statewide NPDES General Permit for Storm Water Discharges associated with future construction activity which would prevent storm water pollution from impacting waters of the U.S. in the vicinity of the project area, will be required. 10b) Impact Discussion: See response 10a above. 10c-i) Impact Discussion: There are no streams or rivers nearby. The Public Works/Engineering Department has reviewed the preliminary hydrology report conducted by Civil Trans Inc., dated June 5, 2026, which includes supporting hydraulic and hydrological data. The proposed project Rev 02/26/2026 Page 49 of 70 Initial Study for City of Diamond Bar Tentative Parcel Map No. 83773 (Planning Case No. PL2022-119) Page 17 will not substantially alter the existing drainage pattern of the site or area in a manner which would result in substantial erosion or siltation on- or off -site. Therefore, impacts would be less than significant. 10c-ii) Impact Discussion: The Public Works/Engineering Department has reviewed the preliminary hydrology report conducted by Civil Trans Inc., dated June 5, 2026, which includes supporting hydraulic and hydrological data. The proposed project will not substantially alter the existing drainage pattern of the site or area or substantially increase the rate of amount of surface runoff in a manner which would result in flooding on- or off -site. Therefore, impacts would be less than significant. 10c-iii) Impact Discussion: See response 10c(ii) above. 10c-iv) Impact Discussion: See response 10c(ii) above. 10d) Impact Discussion: The proposed project site is approximately 24 miles inland from the Pacific Ocean and there are no large bodies of water within the vicinity of the project site that would cause inundation by flood hazard, tsunami, seiche and risk release of pollutants. Additionally, the City of Diamond Bar is not subject to any major flood hazards, or potential inundation due to nearby dam failures. The Federal Emergency Management Agency's (FEMA) Flood Insurance Rate Map designated the entire City as within a Flood Zone "X". Flood Zone "X" is identified as an area of 0.2 percent annual chance of flood. Therefore, no impacts would result from the future construction and operation of the proposed project. 10e) Impact Discussion: At the time of development, the project is required to implement an LID Plan prepared for the site, which is designed to comply with the Los Angeles County MS4 Permit, the Water Quality Control Plan for the Los Angeles Region, and the City of Diamond Bar Stormwater and Urban Runoff Pollution Control Ordinance (DBCC Section 8.12.1610). The project would not use groundwater directly, is not located in a designated groundwater recharge area, and its potable water demand would remain within the projections of the WVWD 2020 UWPM, so it would not interfere with sustainable groundwater management. Due to limited scope of ground disturbance, brief period of construction, and adherence to any Geotechnical Report recommendations and applicable existing regulations, the project would not conflict with or obstruct implementation of any water quality control or groundwater management plan. Therefore, impacts would be less than significant. Issues and Su ortin Information Sources: �� � Potentially Significant Impact Less Than Significant with Mitigation Incorporated Less Than Significant Impact No Impact 11. LAND USE AND PLANNING. Would the project: a) Physically divide an established community? () () () (✓) b) Cause a significant environmental impact due to a () () (✓) ( ) conflict with any land use plan, policy, or regulation adopted for the purpose of avoiding or mitigating an environmental effect? 11a) Impact Discussion: The proposed project site would not disrupt or physically divide an established community. The project site is located within an existing gated residential community, surrounded by residential development. Rev 02/26/2026 Page 50 of 70 Initial Study for City of Diamond Bar Tentative Parcel Map No. 83773 (Planning Case No. PL2022-119) Page 18 11 b) Impact Discussion: In accordance with Title 21 of the City of Diamond Bar's City Code, the project applicant has requested the approval of a Tentative Parcel Map to subdivide an existing lot into two lots for the future development of a single-family residence on the newly created lot. If the subdivision is approved, the applicant shall submit a Development Review application for the approval of the project's architectural and site design. With the approval of these entitlements, the development of the proposed project would be in compliance with all applicable City of Diamond Bar's land use plan, policy, and regulations. Issues and Su ortin Information Sources: �� � Potentially Signiacant Impact Less Than Significant with Mitigation Incorporated Less Than Significant Impact No Impact 12. MINERAL RESOURCES. Would the project: a) Result in the loss of availability of a known mineral ( ) () () (✓) resource that would be of value to the region and the residents of the State? b) Result in the loss of availability of a locally ( ) () () (✓) important mineral resource recovery site delineated on a local general plan, specific plan or other land use plan? 12a) Impact Discussion: The project site is not identified as a site with known mineral resources that would be of value to the region and the residents of the state. Therefore, the proposed project would have no impacts to mineral resources. 12b) Impact Discussion: The proposed project will not result in the loss of availability of a locally - important mineral resource recovery site delineated on a local general plan, specific plan, or other land use plan, because the site contains no known mineral resources. Potentially Less Than Less Than No Impact Issues and Su ortin Information Sources: �� � Signiacant Significant Significant Impact with Mitigation Impact Incorporated 13. NOISE. Would the project result in: a) Generation of a substantial temporary or () () (✓) ( ) permanent increase in ambient noise levels in the vicinity of the project in excess of standards established in the local general plan or noise ordinance, or applicable standards of other agencies? b) Generation of excessive groundborne vibration or () () (✓) ( ) groundborne noise levels? c) For a project located within the vicinity of a private () () () (✓) airstrip or an airport land use plan or, where such a plan has not been adopted, within two miles of a public airport or public use airport, would the project expose people residing or working in the project area to excessive noise levels? 13a) Impact Discussion: There will be a temporary increase in noise levels during the future construction of the single-family residence, but it will not be substantial and shall remain within Rev 02/26/2026 Page 51 of 70 Initial Study for City of Diamond Bar Tentative Parcel Map No. 83773 (Planning Case No. PL2022-119) Page 19 noise limits established by the City. The City of Diamond Bar's City Code, Chapter 8.12 Division 3, Section 8.12.720 prohibits construction -related noise between the hours of 7:00 p.m. and 7:00 a.m. Construction activity is prohibited on Sundays and holidays. Noise from the short-term (less than ten days) operation of mobile construction equipment may not exceed a maximum of 85 dB. Additionally, the proposed subdivision for the development of a new single-family residence is compatible with the single-family residential uses that surround the project site. The proposed use is not expected to exceed noise levels set forth in the Municipal Code for residential uses. Therefore, impacts would be less than significant. 13b) Impact Discussion: Future construction activities have the potential to create groundborne vibration and/or groundborne noise levels. However, any impacts would be temporary and of minimal duration. Additionally, implementation of the construction hours would restrict these activities to daytime hours only. Therefore, impacts would be less than significant. 13c) Impact Discussion: Construction of the proposed project would have no impact with regard to airports. The project area is not located within two miles of any public airport or within an airport land use plan. Therefore, no impacts would occur. Issues and Su ortin Information Sources: �� � Potentially Significant Impact Less Than Significant with Mitigation Incorporated Less Than Significant Impact No Impact 14. POPULATION AND HOUSING. Would the project: a) Induce substantial population growth in an area, () () (✓) ( ) either directly (for example, by proposing new homes and businesses) or indirectly (for example, through extension of roads or other infrastructure)? b) Displace substantial numbers of existing housing, () () () (✓) necessitating the construction of replacement housing elsewhere? 14a) Impact Discussion: The increase of a new single-family residence is not significant in the context of the City as a whole or substantial for the area. Therefore, impacts would be less than significant. 14b) Impact Discussion: The project site is an existing lot with an existing single-family residence that is proposed to remain, therefore will not displace housing for substantial numbers of people as a result of this project. Rev 02/26/2026 Page 52 of 70 Initial Study for City of Diamond Bar Tentative Parcel Map No. 83773 (Planning Case No. PL2022-119) Page 20 Potentially Less Than Less Than No Impact Issues and Supporting Information Sources: �� � Significant Significant Significant Impact with Impact Mitigation Incorporated 15. PUBLIC SERVICES. Would the project: a) Result in substantial adverse physical impacts associated with the provision of new or physically altered governmental facilities, need for new or physically altered governmental facilities, the construction of which could cause significant environmental impacts, in order to maintain acceptable service ratios, response times, or other performance objectives for any of the public services: b) Fire protection? c) Police protection? () () (✓) ( ) d) Schools? () () (✓) ( ) e) Parks? () () (✓) ( ) f) Other public facilities? () () (✓) ( ) 15 a-e Impact Discussion: The marginal increase of a new residential unit from the proposed project are well within those anticipated in the City's General Plan, and would not require the provision of new or altered governmental facilities for fire protection, police protection, schools, park, or other public facilities. However, the applicant is required to pay school fees to the Walnut Valley Unified School District (WVUSD) as part of the building permit process in order to help meet the potential funding needs created by the proposed increase in population, and the WVUSD would receive Average Daily Attendance (ADA) funding for any children attending public schools. Additionally, the project will be conditioned to pay park fees in accordance with Diamond Bar City Code Section 21.32.040. Therefore, impacts would be less than significant. Issues and Supporting Information Sources: �� � Potentially Significant Impact Less Than Significant with Mitigation Incorporated Less Than Significant Impact No Impact 16. RECREATION. Would the project: a) Increase the use of existing neighborhood and ( ) () (✓) ( ) regional parks or other recreational facilities such that substantial physical deterioration of the facility would occur or be accelerated? b) Does the project include recreational facilities or ( ) () (✓) ( ) require the construction or expansion of recreational facilities, which might have an adverse physical effect on the environment? 16a) Impact Discussion: The proposed project would not trigger the new construction or expansion of recreational facilities. Due to the marginal increase of a new residential unit from the proposed project, there may be some increased use of existing neighborhood recreational facilities, but it would not be expected to be significant or to significantly increase the physical deterioration of the facilities. In addition, the project site is located within a gated residential Rev 02/26/2026 Page 53 of 70 Initial Study for City of Diamond Bar Tentative Parcel Map No. 83773 (Planning Case No. PL2022-119) Page 21 community that offers many amenities for their residents, including a swimming pool, board room, club house, community park, and tennis courts. The property owners would pay Homeowners Association dues to maintain the facilities within the Association. Additionally, the project will be conditioned to pay park fees in accordance with Diamond Bar City Code Section 21.32.040. Therefore, impacts would be less than significant. 16b) Impact Discussion: See response 16a above. Issues and Su ortin Information Sources: �� � Potentially Significant Less Than Significant Less Than Significant No Impact Impact with Mitigation Impact Incorporated 17. TRANSPORTATION. Would the project: a) Conflict with a program, plan, ordinance or policy () () (✓) ( ) addressing the circulation system, including transit, roadway, bicycle and pedestrian facilities? b) Conflict or be inconsistent with CEQA Guidelines () () (✓) ( ) § 15064.3, subdivision (b)? c) Substantially increase hazards due to a geometric () () (✓) ( ) design feature (e.g., sharp curves or dangerous intersections) or incompatible uses (e.g., farm equipment)? d) Result in inadequate emergency access? () () (✓) ( ) 17a) Impact Discussion: The proposed project is limited to the subdivision of one parcel into two lots. The subdivision itself would not alter the existing circulation system, change roadway configurations, or affect transit, bicycle, or pedestrian facilities. Any future development on the newly created lot would be subject to separate review for consistency with applicable City standards and regulations. Bicycle Facilities: The General Plan identifies an existing and planned bicycle network consisting of Class I paths, Class II bike lanes, and Class III routes on selected City streets. Bicycle facilities are primarily provided along major corridors such as Diamond Bar Boulevard, Golden Springs Drive, and other arterials and collectors. Ridge Line Road is a local residential street and is not identified for dedicated bikeway facilities in the General Plan's circulation diagram or bicycle network map. The project would not modify any striped bike lanes or designated bikeways on nearby arterials. Pedestrian Facilities: The project site is located within an existing gated residential community, surrounded by residential development. There are no existing or planned sidewalks within The Country Estates. At the time development is proposed, the project would construct pedestrian walkways connecting the residential building, open space areas and to the Ridge Line Road frontage. The project would not remove existing sidewalks or crosswalks, would not create new barriers to pedestrian travel, and would provide new pedestrian connections that are compatible with the City's circulation policies. As such, the project would not conflict with a program, plan, ordinance, or policy addressing transit, roadway, bicycle, or pedestrian facilities, and impacts would be less than significant. 17b) Impact Discussion: The project involves the subdivision of one parcel into two lots, allowing for the future development of one additional single-family residence consistent with the City's Rev 02/26/2026 Page 54 of 70 Initial Study for City of Diamond Bar Tentative Parcel Map No. 83773 (Planning Case No. PL2022-119) Page 22 General Plan land use designation and zoning. The project is an infill residential development within an urbanized area served by existing roadways, utilities, and public services. The addition of one dwelling unit would generate a minimal number of daily vehicle trips and would not cause a substantial increase in vehicle miles traveled (VMT). Therefore, impacts related to VMT would be less than significant. 17c) Impact Discussion: The proposed project would not create any hazards due to design features or incompatible uses. Access to the project site would be required to comply with all City design standards, which would reduce potential impacts to a less than significant level. 17d) Impact Discussion: The proposed project would not significantly impact the adequacy of existing and future emergency services. The roadways and driveways are existing and will not be relocated. The proposed project would be constructed according to City of Diamond Bar and County of Los Angeles requirements for emergency access. Therefore, significant impacts would not result from the construction and operation of the proposed project. Issues and Supporting Information Sources: �� � Potentially Significant Less Than Significant Less Than Significant No Impact Impact with Impact Mitigation Incorporated 18. TRIBAL CULTURAL RESOURCES. Would the project: a) Would the project cause a substantial adverse change in the significance of a tribal cultural resource, defined in Public Resources Code § 21074 as either a site, feature, place, cultural landscape that is geographically defined in terms of the size and scope of the landscape, sacred place, or object with cultural value to a California Native American tribe, and that is: i) Listed or eligible for listing in the California () (✓) () ( ) Register of Historical Resources, or in a local register of historical resources as defined in Public Resources Code section 5020.1(k), or ii) A resource determined by the lead () (✓) () ( ) agency, in its discretion and supported by substantial evidence, to be significant pursuant to criteria set forth in subdivision (c) of Public Resources Code § 5024.1. In applying the criteria set forth in subdivision (c) of Public Resource Code § 5024.1, the lead agency shall consider the significance of the resource to a California Native American tribe. 18a(i)-(ii) Impact Discussion: AB 52 requires that lead agencies evaluate a project's potential impact on "tribal cultural resources," which include "[s]ites, features, places, cultural landscapes, sacred places, and objects with cultural value to a California Native American tribe that are eligible for inclusion in the California Register of Historical Resources or included in a local register of historical resources." AB 52 also gives lead agencies the discretion to determine, based on substantial evidence, whether a resource qualifies as a "tribal cultural resource." AB 52 applies Rev 02/26/2026 Page 55 of 70 Initial Study for City of Diamond Bar Tentative Parcel Map No. 83773 (Planning Case No. PL2022-119) Page 23 whenever a lead agency adopts an environmental impact report, mitigated negative declaration, or negative declaration. AB 52 also establishes a formal consultation process for California tribes regarding tribal cultural resources. Under AB 52 the lead agencies are required to "begin consultation with a California Native American tribe that is traditionally and culturally affiliated with the geographic area of the proposed project." Native American tribes to be included in the process are those that have requested notice of projects proposed within the jurisdiction of the lead agency. A notification list was obtained from the Native American Heritage Commission and the City sent notices to the Tribes on January 6, 2026, informing them of the opportunity to request consultation. On January 20, 2026, the Gabrieleno Band of Mission Indians — Kizh Nation requested formal consultation in writing and within the required timeframe, in accordance with AB 52. The Tribe indicated that the project area lies in an area where the ancestral territories of the Kizh (Kitc) Gabrieleno's villages adjoined and overlapped. On February 19, 2026, the Tribe provided substantial evidence materials and requested tribal cultural resources mitigation measures for the project, including measures addressing Native American monitoring and the treatment of unanticipated discoveries. Consultation Outcome On February 19, 2026, consultation was completed pursuant to AB 52, and the City considered the Tribe's information and recommendations in evaluating the project's potential to affect tribal cultural resources. Although no tribal cultural resources are known to be present on the project site based on previous record and background research, ground -disturbing activities could expose previously unidentified tribal cultural resources because the project area is within the Tribe's traditional and cultural territory. The Tribe provided substantial evidence materials and requested mitigation measures addressing Native American monitoring and procedures for unanticipated discoveries, and the City incorporated the Tribe's requested mitigation measures verbatim into this IS/MND and the Mitigation Monitoring and Reporting Program. Additionally, in the unlikely event that tribal cultural resources are found, the resources would require proper treatment in accordance with applicable laws, including Public Resources Code sections 5097.9 and 5097.98, Health and Safety Code section 7050.5, and State CEQA Guidelines Section 15064.5. In accordance with Public Resources Code section 21082.3(c) and CEQA Guidelines section 15120(d), any confidential tribal cultural resources information provided during consultation would be maintained in a confidential manner and would not be disclosed in the public IS/MND. With implementation of Mitigation Measures TCR-1 through TCR-3, the project's potential impacts related to tribal cultural resources would be reduced to a less than significant level. Mitiaation Measures: TCR-1: Retain a Native American Monitor Prior to Commencement of Ground -Disturbing Activities A. The project applicant/lead agency shall retain a Native American Monitor from or approved by the Gabrieleno Band of Mission Indians — Kizh Nation. The monitor shall be retained prior to the commencement of any "ground -disturbing activity" for the subject project at all project locations (i.e., both on -site and any off -site locations that are included in the project description/definition and/or required in connection with the project, such as public improvement work). "Ground -disturbing activity" shall include, but is not limited to, demolition, pavement removal, potholing, auguring, grubbing, tree removal, boring, grading, excavation, drilling, and trenching. Rev 02/26/2026 Page 56 of 70 Initial Study for City of Diamond Bar Tentative Parcel Map No. 83773 (Planning Case No. PL2022-119) Page 24 B. A copy of the executed monitoring agreement shall be submitted to the lead agency prior to the earlier of the commencement of any ground -disturbing activity, or the issuance of any permit necessary to commence a ground -disturbing activity. C. The monitor will complete daily monitoring logs that will provide descriptions of the relevant ground -disturbing activities, the type of construction activities performed, locations of ground -disturbing activities, soil types, cultural -related materials, and any other facts, conditions, materials, or discoveries of significance to the Tribe. Monitor logs will identify and describe any discovered TCRs, including but not limited to, Native American cultural and historical artifacts, remains, places of significance, etc., (collectively, tribal cultural resources, or "TCR"), as well as any discovered Native American (ancestral) human remains and burial goods. Copies of monitor logs will be provided to the project applicant/lead agency upon written request to the Tribe. D. On -site tribal monitoring shall conclude upon the latter of the following (1) written confirmation to the Kizh from a designated point of contact for the project applicant/lead agency that all ground -disturbing activities and phases that may involve ground -disturbing activities on the project site or in connection with the project are complete; or (2) a determination and written notification by the Kizh to the project applicant/lead agency that no future, planned construction activity and/or development/construction phase at the project site possesses the potential to impact Kizh TCRs. TCR-2: Unanticipated Discovery of Tribal Cultural Resource Objects (Non-Funerary/Non- Ceremonial) A. Upon discovery of any TCRs, all construction activities in the immediate vicinity of the discovery shall cease (i.e., not less than the surrounding 50 feet) and shall not resume until the discovered TCR has been fully assessed by the Kizh monitor and/or Kizh archaeologist. The Kizh will recover and retain all discovered TCRs in the form and/or manner the Tribe deems appropriate, in the Tribe's sole discretion, and for any purpose the Tribe deems appropriate, including for educational, cultural and/or historic purposes. TCR-3: Unanticipated Discovery of Human Remains and Associated Funerary or Ceremonial Objects A. Native American human remains are defined in PRC 5097.98 (d)(1) as an inhumation or cremation, and in any state of decomposition or skeletal completeness. Funerary objects, called associated grave goods in Public Resources Code Section 5097.98, are also to be treated according to this statute. B. If Native American human remains and/or grave goods are discovered or recognized on the project site, then Public Resources Code 5097.9 as well as Health and Safety Code Section 7050.5 shall be followed. C. Human remains and grave/burial goods shall be treated alike per California Public Resources Code section 5097.98(d)(1) and (2). D. Preservation in place (i.e., avoidance) is the preferred manner of treatment for discovered human remains and/or burial goods. Rev 02/26/2026 Page 57 of 70 Initial Study for City of Diamond Bar Tentative Parcel Map No. 83773 (Planning Case No. PL2022-119) Page 25 E. Any discovery of human remains/burial goods shall be kept confidential to prevent further disturbance. Issues and Su ortin Information Sources: �� � Potentially Significant Less Than Significant Less Than Significant No Impact Impact with Impact Mitigation Incorporated 19. UTILITIES AND SERVICE SYSTEMS. Would the project. () () (✓) ( ) a) Require or result in the relocation or construction of new or expanded water, wastewater treatment or storm water drainage, electric power, natural gas, or telecommunications facilities, the construction or relocation of which could cause significant environmental effects? b) Have sufficient water supplies available to serve () () (✓) ( ) the project and reasonably foreseeable future development during normal, dry and multiple dry years? c) Result in a determination by the waste water () () (✓) ( ) treatment provider, which serves or may serve the project that it has adequate capacity to serve the project's projected demand in addition to the provider's existing commitments? d) Generate solid waste in excess of state or local () () (✓) ( ) standards, or in excess of the capacity of local infrastructure, or otherwise impair the attainment of solid waste reduction goals? e) Comply with federal, state, and local management () () (✓) ( ) and reduction statutes and regulations related to solid waste? 19a) Impact Discussion: The proposed project would not result in significant impacts and would not exceed wastewater treatment requirements of the applicable Regional Water Quality Control Board, and would have a less than significant impact on the need to construct new water or wastewater treatment facilities or expansion of existing facilities. Additionally, the following agencies reviewed the proposed project and have stated it is prepared to provide its services: • County Sanitation Districts of Los Angeles County correspondence dated February 3, 2023 • Walnut Valley Water District correspondence dated February 7, 2023 • Southern California Edison correspondence dated March 13, 2023 • Southern California Gas Company correspondence dated March 8, 2023 19b) Impact Discussion: See response 19a above. 19c) Impact Discussion: The County Sanitation Districts of Los Angeles County reviewed the proposed project and, in a correspondence dated February 3, 2023, states it is prepared to provide wastewater service to this project. Rev 02/26/2026 Page 58 of 70 Initial Study for City of Diamond Bar Tentative Parcel Map No. 83773 (Planning Case No. PL2022-119) Page 26 19d) Impact Discussion: Refuse and recycling service is provided by Valley Vista Services for single-family residential developments. The company transports collected materials to their own processing facility, the Grand Central Recycling and Transfer Station located in the City of Industry. Because the Grand Central Recycling and Transfer Station is a transfer and processing facility and not a landfill, it does not have a set expiration year or a finite volumetric capacity. Unlike landfills, a transfer station operates as a daily transit point. Waste is brought in, sorted for recycling, consolidated, and hauled away to regional landfills within 48 hours. All solid waste materials generated at the project site would be disposed of in accordance with applicable state, federal, and local statutes and regulations. 19e) Impact Discussion: See response 19d above. Issues and Su ortin Information Sources: �� � Potentially Significant Less Than Significant Less Than Significant No Impact Impact with Mitigation Impact Incorporated 20. WILDFIRE. Would the project: a) Substantially impair an adopted emergency ( ) () () (✓) response plan or emergency evacuation plan? b) Due to slope, prevailing winds, and other factors, ( ) () (✓) ( ) exacerbate wildfire risks, and thereby expose project occupants to pollutant concentrations from a wildfire or the uncontrolled spread of a wildfire? c) Require the installation or maintenance of ( ) () (✓) ( ) associated infrastructure (such as roads, fuel breaks, emergency water sources, power lines or other utilities) that may exacerbate fire risk or that may result in temporary or ongoing impacts to the environment? d) Expose people or structures to significant risks, () () (✓) ( ) including downslope or downstream flooding or landslides, as a result of runoff, post -fire slope instability, or drainage changes? 20a) Impact Discussion: The City of Diamond Bar does not have an adopted emergency evacuation plan; however, the City facilitates the coordination of emergency response efforts through its Emergency Operations Center (EOC), which is a central location of authority that allows for face-to-face coordination and decision making between City staff and outside organization. The project does not propose to modify and would not interfere with the EOC. Future construction activities would be located on the project site. No lane closures are expected to be required during construction activities. As a result, future construction activities would not impair or interfere with emergency response or emergency evacuation. 20b) Impact Discussion: At the time when a single-family residential development is proposed, the project will be required to prepare a Fuel Modification Plan which shall be reviewed by the Los Angeles County Fire District (LACFD) to review location of structures, type of construction, topography, slope, amount and arrangement of vegetation and overall site setting. Therefore, impacts would be less than significant. Rev 02/26/2026 Page 59 of 70 Initial Study for City of Diamond Bar Tentative Parcel Map No. 83773 (Planning Case No. PL2022-119) Page 27 20c) Impact Discussion: At the time a single-family residential development is proposed, the project will be required to obtain approval from the HOA and any other applicable agencies for potential impacts to their facilities. Therefore, impacts would be less than significant. 20d) Impact Discussion: At the time when a single-family residential development is proposed, the project will be required to submit a detailed geotechnical investigation report that includes field exploration, laboratory testing and analyses. Therefore, the proposed project would have less than significant impacts to expose people or structures to significant risks, including downslope or downstream flooding or landslides, as a result of runoff, post -fire slope instability, or drainage changes. Potentially Less Than Less Than No Impact Issues and Su ortin Information Sources: �� � Significant Significant Significant Impact with Mitigation Impact Incorporated 21. MANDATORY FINDINGS OF SIGNIFICANCE a) Does the project have the potential to substantially () () (✓) () degrade the quality of the environment, substantially reduce the habitat of a fish or wildlife species, cause a fish or wildlife population to drop below self-sustaining levels, threaten to eliminate a plant or animal community, substantially reduce the number or restrict the range of a rare or endangered plant or animal or eliminate important examples of the major periods of California history or prehistory? b) Does the project have impacts that are individually () () (✓) ( ) limited, but cumulatively considerable? ("Cumulatively considerable" means that the incremental effects of a project are considerable when viewed in connection with the effects of past projects, the effects of other current projects, and the effects of probable future projects. c) Does the project have environmental effects which () () (✓) ( ) will cause substantial adverse effects on human beings, either directly or indirectly? 21 a) Impact Discussion: The project site does not contain the habitat of a fish or wildlife species and therefore future construction of the proposed project would not cause a fish or wildlife population to drop below self-sustaining levels, threaten to eliminate a plant or animal community, or reduce or restrict the range of a rare or endangered plant or animal. Likewise, approval of the proposed project is not anticipated to eliminate examples of major periods of California history or prehistory. 21 b) Impact Discussion: The cumulatively considerable impacts of the individually limited project are not expected to be significant and are in keeping with the long-range considerations of the City's General Plan. With the mitigation measures and conditions of project approval, the cumulative impact of the individually limited project impacts will not be considerable. Rev 02/26/2026 Page 60 of 70 Initial Study for City of Diamond Bar Tentative Parcel Map No. 83773 (Planning Case No. PL2022-119) Page 28 21 c) Impact Discussion: With the mitigation measures and conditions of project approval, no substantial direct or indirect adverse environmental effects on human beings can be expected from this project. SOURCES CITED IN THE EVALUATION OF ENVIRONMENTAL IMPACTS Planning No. PL2022-119 1. City of Diamond Bar 2040 General Plan and Climate Action Plan Environmental Impact Report certified December 17, 2019, Addendum No. 1 dated August 11, 2022 and Addendum No. 2 dated March 17, 2026 2. Diamond Bar City Code 3. City of Diamond Bar Transportation Study Guidelines for Vehicle Miles Traveled and Level of Service Assessment dated November 2025. 4. Tentative Parcel Map No. 83773 5. Hydrology Report prepared by Civil Trans Inc. dated June 5, 2026 6. Letter from Gabrieleno Band of Mission Indians (Kizh Nation) Tribe Dated February 19, 2026 7. All documents cited above are available for review at the City of Diamond Bar, Community Development Department, 21810 Copley Drive, Diamond Bar, CA 91765. The office hours are Monday through Thursday between 7:30 a.m. and 5:30 p.m., and Friday between 7:30 a.m. and 4:30 p.m. Rev 02/26/2026 Page 61 of 70 014 TENTATIVE PARCEL MAP NO. 83773 IN THE CITY OF DIAMOND BAR NATURAL DRAINAGE COURSE 6, �FLoco HAZARD AREA BEING A SUBDIVISION OF ADJUSTED LOT 62 PER CERTIFICATE OF COMPLIANCE CASE NO. 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ECG Y° r P BL A8L 1DEC88 ' I i , / / �' /4 ADJ. /14' OP 1 .6 BC L 169'0202 I 18 9 BLDG = 09BL CE�2_Sl��R1�L S E 1 i' Ii/ ��� I CL .98 ,HOUSE GARAGE -16 8-161.85 DIRT ,6�.42 ,lam' E1 ',C'e!1 `1 L .57 CL 10 1476h 96 X 221 s9 FF=159.88 EG oN �' � W LY LINE 1 FF=158.98 6 A ��TOElb5.7 C LOT 62 I �`h � `s A 159.06 GARDEN DOE 16�: 1 � �� � `� O I 6 Ts B L - 161.7 P -- TRACT I � 4 'T'OE TOEi 1 �' 30091 8.21 O 1.02EG T4E 0 / 8 . 4 \- M B 78 9 I ^ ^�� 45 5 8.70 / 16� O 1S3• 17 . N ° - - 142. � (F OS .52 PO C (E� 1 0.35 S O _ - 1 97� Of 171.63 a 84 19 24"W 1 _ GPI 74 \=� T ����� TONE O E� ��'Fa6�411�67.51� - 6.8 vv 42.00 I ® ° T5T3�- -I-�� D WY - � �5.54� J4 2 F 0 141.53 43190 35 GP ,� - --fi6 _ ' GF�66. 75 P .0� ESW / k 19 �� 86 _ WE ° C�J GP � 146.53 � A N W 155 W �s.a� GP 8 � �'�� 175.-6'2P��NG \\ _ 5 �P 49.58 WF a oG 16 .03 FL RIDGE 142.00' N84° 19'241) YY-------------------------- -;4- CIVIL TRANS INC ENGINEERING, PLANNING, SURVEYING 732 NO. Diamond Bar Blvd., Suite 128 Diamond Bar, California 91765 (909) 396-1131 00 ESS/pay P\ g M. qs�C F2 CO Of NO. 32779 * 06/30/2028 s� Q- T Cif \� F OF CA\ CFO 151.4 S9. x 155.26o '115;.60 DWY A.G. PAVING LINE E 86.00' s ��4 ES EP EP �r� 0�� E E6 E 0 = 05°4026" E1 E2 pp,D , L = 26.54 R 154' GRAPHIC SCALE 30' 0 15' 30' 60' ( IN FEET ) 1 inch = 30 ft MARKI DRAWN BY: CADLINKS REVISION FF=1� �I NORTH SOUTH R/W CL R/W 64' 32' 32' 12' 20' 20' 12' PAVEMENT RIDGE LINE ROAD SECTION A -A SCALE: 1 "=20' SUBDIVISION AREAS 2 - PARCELS SUBDIVISION LOT IP GROSS AREA AC PRIVATE STREET AC NET AREA AC LOT 62 2.30 0.26 2.04 PARCEL 1 1.11 0.08 1.03 PARCEL 2 1.19 0.18 1.01 E� EASEMENT NOTES ADJ. BLDG 1 .50 9. 5 E1 32' WIDE INGRESS, EGRESS, GRADING AND CONSTRUCTION EASEMENT OF \� W L19 .27 THE DIAMOND BAR DEVELOPMENT CORPORATION, A CALIFORNIA 1 .72` FL 7 CORPORATION, sW BY DEED RECORDED SEPTEMBER 12, 1969, AS INSTRUMENT NOS. 1970 0 1 00, 1L7• 19 .54 a & 1973 OF OFFICIAL RECORDS, RECORDS OF LOS ANGELES COUNTY. 7 w 19 .81 0 O 198.89 E2 32' WIDE INGRESS, EGRESS, AND PUBLIC UTILITIES EASEMENT OF DIAMOND // ,��• 1 s6 / BAR COUNTRY ESTATES ASSOCIATION, A NON-PROFIT CORPORATION, BY DEED RECORDED SEPTEMBER 12, 1969, AS INSTRUMENT NOS. 1970 0 // 4 19 .13 1197.49 & 1973 OF OFFICIAL RECORDS, RECORDS OF LOS ANGELES COUNTY. E CL 6' WIDE CONDUIT & UTILITY EASEMENT OF GENERAL TELEPHONE COMPANY OF CALIFORNIA, A CALIFORNIA CORPORATION, BY DEED RECORDED �sw1. PL3 SEPTEMBER 10, 1969, AS INSTRUMENT NOS. 3501 OF OFFICIAL RECORDS, 1977 RECORDS OF LOS ANGELES COUNTY. 9Y.35 NORTH SCALE: 1 "=30' IAPPRV.I DATE CHECKED BY: JMA E4 4' WIDE CONDUIT & UTILITY EASEMENT OF GENERAL TELEPHONE COMPANY 10 OF CALIFORNIA, A CALIFORNIA CORPORATION, BY DEED RECORDED JULY 10, 1970, AS INSTRUMENT NO. 3659 OF OFFICIAL RECORDS, RECORDS OF LOS ANGELES COUNTY. E5 32' WIDE GAS PIPES EASEMENT OF SOUTHERN COUNTIES GAS COMPANY OF CALIFORNIA, A CORPORATION, BY DEED RECORDED APRIL 17, 1970, AS INSTRUMENT NO. 1933 OF OFFICIAL RECORDS, RECORDS OF LOS ANGELES COUNTY. E6 16 1 /2' WIDE PUBLIC UTILITY EASEMENT OF SOUTHERN COUNTIES GAS COMPANY OF CALIFORNIA, A CORPORATION, BY DEED RECORDED JULY 13, 1950 AS INSTRUMENT NO. 1709 AND BY DEED RECORDED DECEMBER 21, 1951 AS DOCUMENT NO. 1974 OF OFFICIAL RECORDS, RECORDS OF LOS ANGELES COUNTY. E7 6' WIDE CONDUIT & UTILITY EASEMENT OF SOUTHERN CALIFORNIA EDISON COMPANY, A CORPORATION, BY DEED RECORDED SEPTEMBER 23, 1969, AS INSTRUMENT NO. 2909 OF OFFICIAL RECORDS, RECORDS OF LOS ANGELES COUNTY. E8 10' WIDE CONDUIT & UTILITY EASEMENT OF SOUTHERN CALIFORNIA EDISON COMPANY, A CORPORATION, BY DEED RECORDED MARCH 12, 1970, AS INSTRUMENT NO. 2105 OF OFFICIAL RECORDS, RECORDS OF LOS ANGELES COUNTY. APPROVALS: APPROVALS: SCALE: PROPERTY ADDRESS: AS SHOWN 23901 RIDGE LINE ROAD, DATE: DIAMOND BAR, CA. 91765 05/08/2026 RECORD OWNERS: Movingae moved Steep Canyon Trail® Mov9 Company 3 Ayres Sui Target Q Rio Lob°a as 3�a Diamond'B r o G=°earlry /�so oe` c, aid cn; °pr twnan Trail ` Calvary Chapel Lee Ave Golden Springs �,c `Oe�� 5' QSouth Coast Air Quality Management District Janelle Warmington, MD- b ©OBGYN - La Vista Health... day Inn Diamond aDiamond Palace Summitridge Trail - Pomona, an IHG Cuisine of India United States Postal Service QDiamond Bar Center a �a W rra4� 'r°s m Maple Hill Summitridge keg ElementarySchool�"a Park [ding Chaparral Middle School0 OQuail Summit Grand Ave 6 , Q° Elementary School c e Dr �a °eha Grand Ave Or � 3 H' C9e¢ Q p` �'0e Dr �O° sae F°c� 4ear caavpO cc+a d O� Mounraln Laurel Way a y° � yo s 23901 Ridge Line Rd, Diamond Bar, CA 91765 a Diamond Bar RbA.�. min drive - home �D< Village Apartments � Aa,� Sprat zone . net spray Pa g booth manufacturing V Pd9 by '2sry� a°qo ur ad QSt. Denis Catholic Church Qa 4ap° 9Nextgen Decor oegiii" �,a m ° Country Park© e.e Martin West QaF Diamond Bar Country Go gle'4P State hospital 5 Est Association PROJECT SITE VICINITY MAP N.T.S. (M NORTH ABBREVIATIONS: FL FLOW LINE CONIC CONCRETE FS FINISH GRADE FF FINISH FLOOR SMH SEWER MANHOLE TW TOP OF WALL FTG FOOTING CL CENTER LINE R/W RIGHT OF WAY SB SETBACK RUA RESTRICTED USE AREA EX EXISTING LEGAL DESCRIPTION: LEGEND: SUBDIVISION BOUNDARY SUBDIVISION LOT LINE EASEMENT LINE EDGE OF PAVEMENT SURFACE FLOW CENTER LINE RIGHT OF WAY LOT 62 OF TRACT NO 30091, MB 789/71, AS ADJUSTED PER COC LLA-18-79, RECORDED 12/13/19 IN THE OFFICE OF THE RECORDER OF COUNTY OF LOS ANGELES, STATE OF CALIFORNIA APN 8713004016 BASIS OF BEARING: THE BEARING OF N76°22'18"E OF THE CENTERLINE OF RIDGE LINE ROAD. AS SHOWN ON TRACT NO. 30091, MB 789/71 WAS TAKEN AS THE BASIS OF BEARING. BENCHMARK: ASSUME ELEV. = 200' FD. BOLT 2" DN. ON THE INTERSECTION OF CENTER LINE DERRINGER LANE & RIDGE LINE ROAD UTILITIES: WATER WALNUT VALLEY WATER DISTRICT SEWER CITY OF DIAMOND BAR ELECTRICITY SOUTHERN CALIFORNIA EDISON GAS COMPANY SOUTHERN CALIFORNIA TELEPHONE GAS COMPANY VERIZON CALIFORNIA SUBDIVISION NOTES: 1. THIS SUBDIVISION IS A PARCEL MAP WHICH CONSISTS OF TWO (2) LAND PARCELS ONLY. NO IMPROVEMENTS ARE PLANNED FOR THIS SUBDIVISION. 2. ALL EXISTING IMPROVEMENTS ON NEW PARCEL 1 REMAIN 3. THIS PROJECT IS NOT WITHIN A SPECIFIC PLAN. 4. ZONING EXIST ZONING: R1 1 AC PROPOSED ZONING: R1 1 AC 5. LAND USE: SINGLE FAMILY RESIDENTIAL EXIST LAND USE: SAME AS EXISTING PROPOSED: 6. PROPOSED DENSITY 7. MINIMUM AND AVE GROSS LOT AREA 1 AC 8. LOT DIMENSIONS - PER PLAN 9. FEMA FLOOD PLAIN - FLOOD ZONE C NOT IN FLOOD HAZARD ZONE 10. THE SUBJECT PROPERTY IS NOT IN FAULT ZONE AND IS LIQUIDFACACTION POTENTIAL IS NONE. 11. THOMAS BROS. MAP PAGE 641-A4, YR. 2015 TENTATIVE PARCEL MAP NO. 83773 ADJUSTED LOT 62 PER COC NO. LLA-18-79 DIAMOND BAR, CA. APN: 8713-004-016 W.O. FOR: SHEET 1 1 OF 1 FILE No. 450-271-P2 Page 62 of 70 i 32, / o co CO N C1 z � 1 i MAIL- BOX FUTURE- DWY Q 'o 0 Q o� 0 1 O ' �i EP U Z00 1 J NI 1 o O 4 SMH O MAI L BOX 2381 t/ R(E) HOUSE / (NOT A APR) ROAD / / (E) LOT 61, TRACT 30091 NOT A PART OF THIS SUBDIVISION 3 / TRACT 30091, LOT 62 / 32 \ \ o N0 l.06� 9 \ 5.00 , M8 789 600 PR — — / /NE — — EP o 00 J E7 \ WM a RSB ; 5, PER E'LY LINE OF LOT 61 AND ADJUSTED 529 RE RECORDED ODEC. 13,F LOT 22019, LL CORDS7 OF PER LOS OANGELES Co.6CA. N11'07'34"W 453.87' PROPERTY LINE — DEPTH 595.00' PARCEL = o / CO / RUA-0.49AC / PARCEL 1 ,o WF \ \ 1 \ \ N9;7.06'00" z l 393.98, E8 E4 / 4 1 FUTURE PLANNED FOOTPRINT E7 (N) HOUSE co cN 1 J FUTURE 1 1 WALKWAY CIVIL TRANS INC ENGINEERING, PLANNING, SURVEYING 732 NO. Diamond Bar Blvd., Suite 128 Diamond Bar, California 91765 (909) 396-1131 QROf ESS/pH PAP\ W NO. 32779 �OF C 25' Q0 / U 'o o PROPOSED PARCEL 1 OF ADJ LOT 62 / GROSS = 1.11 AC PRIVATE ST. = 0.08 AC _ \ NET = 1.03 AC N12'04'31"W 369.11 PROPERTY LINE PROPOSED PARCEL 2 OF ADJ. LOT 62 GROSS = 1.19 AC PRIVATE ST. = 0.18 AC NET = 1.01 AC / / 3 / / / / <1} 9 �g �0, I,,P1 11,0"90 EP GRAPHIC SCALE 20' 0 10' 20' 40' ( IN FEET ) 1 inch = 20 ft = I NATURAL DRAINAGE COURSE / FLOOD HAZARD AREA / I (LOCATED IN RUA) / / Ln / ABBREVIATIONS: / AC ACRES / DWY DRIVEWAY / FL FLOW LINE CONC CONCRETE / FS FINISH GRADE E'LY LINE OF LOT 62, TRACT 30091, / MB 789, PGS 51-75 FF FINISH FLOOR FSB FRONT SETBACK RC E� pEP�N SMH SEWER MANHOLE TW TOP OF WALL /Q FOOTING CLG CENTER LINE R/W RIGHT OF WAY / (CPT SB SETBACK �s1 RUA RESTRICTED USE AREA ti EX EXISTING 0000 EP EDGE OF PAVEMENT / WF WOOD FENCE FH FIRE HYDRANT / WV WATER VALVE / WM WATER METER / RSB REAR SETBACK / FSB FRONT SETBACK Ole Ole / Ole .0001� / / / MARK DRAWN BY: CADLINKS (E) LOT 63, TRACT 30091 NOT A PART OF THIS SUBDIVISION AVERAGE SLOPE=ENTIRE LOT PRIOR TO SUBDIVISION 0.00229 x I x L S = A I = CONTOUR INTERVAL = 5 FEET (SURVEY CONTOUR MAP) L = COMBINED LENGTH OF CONTOURS = 6,470 FEET A = PARCEL AREA IN ACRES = 2.30 AC (88,427 SF) S _ 0.00229 x 5 x 3,090 = 32.2% 2.30 AVERAGE SLOPE: S = 32.2% NORTH SCALE: 1 "=20' JAPPRVJ DATE CHECKED BY: JMA APPROVALS: APPROVALS: NOTES: 1. DEDICATED PRIVATE FRONT STREET AREAS ARE NOT INCLUDED IN THE NEW PARCELS GROSS AREAS. PER NOTE 1 OF RECORDED LOT LINE ADJUSTMENT LLA-18-79, DATED 12/13/19. 2. PROPOSED PARCEL 2 DOES NOT HAVE ANY RUA, HENCE NO RUA RESTRICTIONS. 3. PROPOSED PARCEL 1 HAS 0.49 AC RUA, BUT IT IS EXISTING IMPROVED PARCEL AND NO FUTURE IMPROVEMENTS ARE PLANNED. PROJECT SCOPE OF WORK z I i LEGEND: SUBDIVISION BOUNDARY SUBDIVISION LOT LINE RIGHT OF WAY EDGE OF PAVEMENT EASEMENT LINE CENTER LINE A I I I I I I I I I 1\ CRIB WALL CONCRETE SURFACE THE SCOPE OF WORK IS TO SUBDIVIDE THE EXISTING ADJUSTED LOT AND CREATE 2-NEW LAND PARCELS. NO DEVELOPMENT IS INCLUDED ON THE NEW PARCEL 2, FUTURE PLANNED FOOTPRINT IS SHOWN FOR REFERENCE ONLY. EASEMENT NOTES E1 32' WIDE INGRESS, EGRESS, GRADING AND CONSTRUCTION EASEMENT OF THE DIAMOND BAR DEVELOPMENT CORPORATION, A CALIFORNIA CORPORATION, BY DEED RECORDED SEPTEMBER 12, 1969, AS INSTRUMENT NOS. 1970 & 1973 OF OFFICIAL RECORDS, RECORDS OF LOS ANGELES COUNTY. E2 32' WIDE INGRESS, EGRESS, AND PUBLIC UTILITIES EASEMENT OF DIAMOND BAR COUNTRY ESTATES ASSOCIATION, A NON-PROFIT CORPORATION, BY DEED RECORDED SEPTEMBER 12, 1969, AS INSTRUMENT NOS. 1970 & 1973 OF OFFICIAL RECORDS, RECORDS OF LOS ANGELES COUNTY. E3 6' WIDE CONDUIT & UTILITY EASEMENT OF GENERAL TELEPHONE COMPANY OF CALIFORNIA, A CALIFORNIA CORPORATION, BY DEED RECORDED SEPTEMBER 10, 1969, AS INSTRUMENT NOS. 3501 OF OFFICIAL RECORDS, RECORDS OF LOS ANGELES COUNTY. E4 4' WIDE CONDUIT & UTILITY EASEMENT OF GENERAL TELEPHONE COMPANY OF CALIFORNIA, A CALIFORNIA CORPORATION, BY DEED RECORDED JULY 10, 1970, AS INSTRUMENT NO. 3659 OF OFFICIAL RECORDS, RECORDS OF LOS ANGELES COUNTY. E5 32' WIDE GAS PIPES EASEMENT OF SOUTHERN COUNTIES GAS COMPANY OF CALIFORNIA, A CORPORATION, BY DEED RECORDED APRIL 17, 1970, AS INSTRUMENT NO. 1933 OF OFFICIAL RECORDS, RECORDS OF LOS ANGELES COUNTY. E6 16 1/2' WIDE PUBLIC UTILITY EASEMENT OF SOUTHERN COUNTIES GAS COMPANY OF CALIFORNIA, A CORPORATION, BY DEED RECORDED JULY 13, 1950 AS INSTRUMENT NO. 1709 AND BY DEED RECORDED DECEMBER 21, 1951 AS DOCUMENT NO. 1974 OF OFFICIAL RECORDS, RECORDS OF LOS ANGELES COUNTY. E7 6' WIDE CONDUIT & UTILITY EASEMENT OF SOUTHERN CALIFORNIA EDISON COMPANY, A CORPORATION, BY DEED RECORDED SEPTEMBER 23, 1969, AS INSTRUMENT NO. 2909 OF OFFICIAL RECORDS, RECORDS OF LOS ANGELES COUNTY. E8 10' WIDE CONDUIT & UTILITY EASEMENT OF SOUTHERN CALIFORNIA EDISON COMPANY, A CORPORATION, BY DEED RECORDED MARCH 12, 1970, AS INSTRUMENT NO. 2105 OF OFFICIAL RECORDS, RECORDS OF LOS ANGELES COUNTY. SCALE: PROPERTY ADDRESS: AS SHOWN 23901 RIDGE LINE ROAD, DATE: DIAMOND BAR, CA. 91765 05/08/2026 RECORD OWNERS: MR. & MRS. ARUN JANE PROPOSED SITE PLAN SHEET ADJUSTED LOT 62 PER COC NO. LLA-18-79 1 DIAMOND BAR, CA. APN: 8713-004-016 1 OF 1 FILE No. W.O. FOR: F.B. 450-271-P2 Page 63 of 70 NO WORK SHALL BE DONE ON THIS SITE UNTIL BELOW AGENCY IS NOTIFIED OF INTENTION TO GRADE OR EXCAVATE. DIGAX�ERT CALL 811 or 1- 800- 422- 4133 2 Working Days Before You Dig WWW.CALL81 l .COM GRADING GENERAL NOTES: PRELIMINARY GRADING PLAN FOR PARCEL 2 OF TENTATIVE PARCEL MAP NO. 83773 1. ALL GRADING SHALL COMPLY WITH THE PROVISIONS OF THE LATEST CALIFORNIA BUILDING CODE AND ALL AMENDMENTS ADOPTED BY THE CITY. 2. ALL HILLSIDE GRADING WITH SLOPES IN EXCESS OF 10% SHALL COMPLY WITH THE HILLSIDE MANAGEMENT ORDINANCE AND SHALL TYPICALLY NOT EXCEED 2:1. 3, NO GRADING SHALL COMMENCE UNTIL A GRADING PERMIT HAS BEEN ISSUED BY THE CITY OF DIAMOND BAR. 4, ALL FILL SLOPES SHALL BE COMPACTED TO NOT LESS THAN 90 PERCENT OF THE MAXIMUM DENSITY. 5. SUFFICIENT TESTS OF SOIL PROPERTIES, INCLUDING SOIL TYPES AND SHEAR STRENGTHS SHALL BE MADE DURING GRADING OPERATIONS TO VERIFY COMPLIANCE WITH DESIGN CRITERIA. THE RESULTS OF SUCH TESTING SHALL BE REPORTED IN THE FINAL AS -GRADED REPORT (PREPARED BY THE APPLICANT AT HIS EXPENSE), OR UPON REQUEST OF THE CITY. A MINIMUM NUMBER OF FIELD DENSITY TEST ARE TO BE MADE AS FOLLOWS: A. ONE TEST FOR EACH TWO -FOOT VERTICAL LIFT. B. ONE TEST FOR 1000 CUBIC YARDS OF MATERIAL PLACED. C. A SUFFICIENT NUMBER OF FINISH SLOPE TESTS TO VERIFY COMPACTION OF THE SLOPE SURFACE. 6, NO FILL SHALL BE PLACED UNTIL STRIPPING OF VEGETATION, REMOVAL OF UNSUITABLE SOILS, AND INSTALLATION OF SUBDRAINS (IF NEEDED) IS ACCEPTED BY THE SOILS ENGINEERING GEOLOGIST. 7. NO FILL SHALL BE PLACED UNTIL THE PLACEMENT OF EROSION CONTROL MEASURE FOR THE PROJECT IS ACCEPTED BY THE CITY. 8. THE UNDERSIGNED CIVIL ENGINEER HEREBY STATES THAT THESE PLANS WERE PREPARED BY HIM OF UNDER HIS SUPERVISION AND THAT THE PLANS CONFORM TO ALL PERTINENT PROVISIONS OF SECTION 1803, EXCAVATION, GRADING AND FILL AND APPENDIX J, GRADING REQUIREMENTS OF THE CALIFORNIA BUILDING CODE (2013). JAVAID M. ASLAM R.C.E. 32779 DATE: FEBRUARY 15, 2026 9. APPROVED PROTECTIVE MEASURES AND TEMPORARY DRAINAGE PROVISIONS SHALL BE PROVIDED TO PROTECT ADJOINING PROPERTIES FROM DEPOSITION OF MATERIAL OF DIVERTED FLOWS BOTH DURING AND AFTER ALL PHASES OF CONSTRUCTION. 10. ALL OFFSITE IMPROVEMENTS SHALL BE COMPLETED TO THE SATISFACTION OF THE CITY ENGINEER. 11. ROUGH GRADING CERTIFICATE MUST BE SIGNED BY SOILS AND CIVIL ENGINEERS OF RECORD AND APPROVED BY THE CITY INSPECTOR PRIOR TO ISSUANCE OF BUILDING PERMITS. 12. ALL CUTS SHALL BE OBSERVED BY THE ENGINEERING GEOLOGIST OF RECORD DURING GRADING SO THAT ANY ADVERSE CONDITIONS CAN BE RECOGNIZED AND CORRECTED. 13. ANY MODIFICATIONS OF, OR CHANGES IN, THE APPROVED GRADING PLANS MUST BE APPROVED BY THE CITY. 14. ALL GRADING SITES MUST HAVE DRAINAGE SWALES BERMS, AND OTHER DRAINAGE DEVICES APPROVED AT THE ROUGH GRADING STAGE. 15. NO ROCK OR SIMILAR MATERIAL GREATER THAN 8" IN DIAMETER WILL BE PLACED IN THE FILL UNLESS RECOMMENDATIONS FOR SUCH PLACEMENT HAVE BEEN SUBMITTED BY THE SOILS ENGINEER AND APPROVED IN ADVANCE BY THE CITY. 16. GRADING OPERATIONS MUST BE CONDUCTED UNDER THE CONTINUOUS OBSERVATION OF THE SOILS ENGINEER AND/OR THE ENGINEER GEOLOGIST OF RECORD. 17. EXCAVATIONS FOR STABILITY KEYS AND REMOVAL OF UNSUITABLE SOILS MUST BE OBSERVED AND ACCEPTED IN WRITING BY THE SOILS ENGINEER OR ENGINEERING GEOLOGIST OF RECORD PRIOR TO THE PLACING OF FILL. 18. THE SOILS ENGINEER AND/OR ENGINEERING GEOLOGIST OF RECORD MUST DOCUMENT AND ACCEPT ROUGH GRADING BY FINAL REPORT PRIOR TO APPROVAL BY THE CITY. THE FINAL REPORT MUST INCLUDE AND AS -GRADED GEOTECHNICAL MAP. 19. THE SOILS ENGINEER AND/OR ENGINEERING GEOLOGIST OF RECORD MUST MAKE A FINDING IN ACCORDANCE WITH SECTION 111 OF THE LOS ANGELES COUNTY BUILDING CODE FOR THE GRADED SITE PRIOR TO APPROVAL BY THE CITY. 20. FOUNDATION AND/OR WALL EXCAVATIONS MUST BE OBSERVED AND ACCEPTED IN WRITING BY THE SOILS ENGINEER OR ENGINEERING GEOLOGIST OF RECORD PRIOR TO PLACING STEEL OR CONCRETE. BENCH MARK: ELEV. 200' (ASSUMED) FD. BOLT 2" DN ON THE INTERSECTION OF DERRINGER LANE AND RIDGE LINE ROAD. TOPOGRAPHIC SURVEY SOURCE: SURVEYOR: GOLDEN LAND ENGINEERING INC. TEL: (714) 671-1050 XT16 DATE: 11-05-2016 DIAMOND BAR., CALIFORNIA GRADING GENERAL NOTES: (CONTINUED) 21. A REGISTERED CIVIL ENGINEER SHALL SUBMIT A GRADING CERTIFICATE TO THE CITY ENGINEER NO MORE THAN 10 WORKING DAYS UPON COMPLETION OF FINAL GRADING OPERATIONS. CERTIFICATE OF OCCUPANCY SHALL BE ISSUED SUBJECT TO THE CITY ENGINEER'S APPROVAL OF SAID ENGINEER'S CERTIFICATE. FINAL GRADING MUST BE APPROVED BY THE CITY BEFORE OCCUPANCY OF BUILDINGS WILL BE ALLOWED. 22. THE SOILS AND GEOLOGY REPORT PREPARED BY AND DATED SHALL BECOME A PART OF THIS GRADING PLAN AND ALL RECOMMENDATIONS CONTAINED THEREIN SHALL BE STRICTLY ADHERED TO. 23. A COPY OF THE GRADING PERMIT AND APPROVED GRADING PLANS MUST BE IN THE POSSESSION OF A RESPONSIBLE PERSON AND AVAILABLE AT THE SITE AT ALL TIMES. 24. FINAL GRADING MUST BE APPROVED PRIOR TO OCCUPANCY OF BUILDINGS WILL BE ALLOWED. 25. THESE PLANS HAVE BEEN CHECKED BY THE CITY OF DIAMOND BAR ONLY FOR CONFORMANCE WITH THE CITY STANDARDS, COMPLIANCE WITH DEVELOPMENT CONDITIONS AND FOR GENERAL CONCEPTUAL APPROVAL OF THE DRAINAGE AND PARKWAY IMPROVEMENTS SHOWN HEREON. NO DETAILED MATHEMATICAL CHECK WAS MADE FOR THE ACCURACY OF THE EXISTING OR PROPOSED DIMENSIONS, LINES, OR GRADE SHOWN INCLUDING ALL EXISTING UTILITIES SHOWN OR NOT SHOWN. 26. CONTRACTOR SHALL NOTIFY THE CITY ENGINEER'S OFFICE AT (909)839-7040 FORTY-EIGHT (48) HOURS IN ADVANCE OF INTENTION TO BEGIN GRADING. 27. CONTRACTOR SHALL COMPLY WITH THE CALIFORNIA STORM WATER BEST MANAGEMENT PRACTICES HANDBOOKS AND THE PROJECT'S STANDARD URBAN STORM WATER MITIGATION PLAN (SUSMP) REQUIREMENTS AS NECESSARY. 28. DIRECT ALL ROOFTOP RUNOFF TO PERVIOUS AREAS. 29. SUFFICIENT TEST OF FILL SOILS SHALL BE MADE DURING THE GRADING TO VERIFY THAT THE SOIL PROPERTIES COMPLY WITH THE DESIGN REQUIREMENTS, AS DETERMINED BY THE ENGINEERING GEOLOGIST/GEOTECHNICAL ENGINEER INCLUDING SOIL TYPES, SHEAR STRENGTH PARAMETERS AND CORRESPONDING UNIT WEIGHTS. 30. TYPE V CEMENT SHALL BE USED FOR ALL CONCRETE WORK COMING IN CONTACT WITH THE GROUND, UNLESS OTHERWISE INDICATED BY THE PROJECT'S SOIL ENGINEER. 31. GRADING AND CONSTRUCTION ACTIVITIES AND THE TRANSPORTATION OF EQUIPMENT AND MATERIALS AND OPERATION OF HEAVY GRADING EQUIPMENT SHALL BE LIMITED TO BETWEEN THE HOURS OF 7:00 A.M. AND 5:00 P.M., MONDAY THROUGH SATURDAY. DUST GENERATED BY GRADING AND CONSTRUCTION ACTIVITIES SHALL BE REDUCED BY WATERING THE SOIL PRIOR TO AND DURING THE ACTIVITIES AND IN ACCORDANCE WITH SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT RULE 402 AND RULE 403. RECLAIMED WATER SHALL BE USED WHENEVER POSSIBLE. ADDITIONALLY, ALL CONSTRUCTION EQUIPMENT SHALL BE PROPERLY MUFFLED TO REDUCE NOISE LEVELS. REVISION PLANS PREPARED BY: , CIVIL TRANS INC ENGINEERING, PLANNING, SURVEYING 732 NO. Diamond Bar Blvd., Suite 128 Diamond Bar, California 91765 (909) 396-1131 QROFESS/pN M. < � c NO. 32779 A it fV.06/.30/2028 li TF C I V \L pQ`. �OF C A�� WORK TO BE DONE: 1. CONSTRUCTION OF NEW SINGLE FAMILY HOUSE WITH RETAINING WALLS, HARDSCAPE AND LANDSCAPE AREAS. SEE ARCHITECTURAL PLANS FOR ADDITIONAL DATA AND INFORMATION. EARTHWORK QUANTITIES: 1. TOTAL CUT = 620 CY 2. TOTAL FILL = 6,530 CY 3. IMPORT = 5,910 CY DISTURBED AREA: 13,400 = 0.30 AC SHEET INDEX: 1. GENERAL NOTES 2. PRELIMINARY GRADING PLAN 3. SECTIONS AND DETAILS 4. SLOPE SETBACK SECTION C I T Y O F c DIAMOND BAR C A L I F O R N I A GEOTECHNICAL ENGINEER'S STATEMENT OF COMPLIANCE SOIL ENGINEER RCE C-1 C-2 C-3 C-4 ABBREVIATIONS: AC ASPHALT CONCRETE BM BENCHMARK BW BACK OF WALK CONC. CONCRETE CMU CONCRETE MASONRY UNIT DI DRAIN INLET FF FINISH FLOOR FG FINISH GRADE FL FLOW LINE FNC FENCE FS FINISH SURFACE GS GROUND SHOT REINF. REINFORCEMENT TC TOP OF CURB TW TOP OF WALL G GAS S SEWER W WATER NG NATURAL GROUND TF TOP OF FOOTING PL PROPERTY LINE SB SET BACK TS TOP OF SLOPE GB GRADE BREAK GFF GARAGE FINISH FLOOR OG ORIGINAL GROUND H HEIGHT MIN MINIMUM INV INVERT W.I. WROUGHT IRON COR. CORNER DL DAYLIGHT DN DOWN SD STORM DRAIN VICINITY MAP N.T.S. NORTH I 1=t'_%c:nln (1132) PUDLOC WORKS DEPARTMENT T Y O F D I A M O N D STATE OF CALIFORNIA DATE DAVID G. LIU, P.E. CITY ENGINEER RCE 44053 DATE PLANS REVIEWED FOR THE CITY OF DIAMOND BAR BY: ENGINEER GEOLOGIST RCE DATE GENERAL NOTES DATE ROCK RIPRAAP CONCRETE PAVEMENT PROPERTY LINE EASEMENT LINE EXISTING CONTOUR & GRADING AREA NEW CONTOUR 12" SQ CATCH BASIN EXIST SURFACE FLOW FLOW DIRECTION NEW RETAINING WALL NEW CRIB WALL W.I. FENCE EXISTING WOOD FENCE SD PIPE DAYLIGHT SLOPE AREA 2:1 MAX LEGAL DESCRIPTION PARCEL 2 OF TPM NO. 83773 AND PORTION OF ADJUSTED LOT 62 PER LLA-18-79, DATED 12/13/19 APN: 8713 004 016 OWNER: MR. & MRS. ARUN JAIN SITE ADDRESS: 23901 RIDGE LINE ROAD DIAMOND BAR, CA. 91765 DRAWN BY EJ CHECKED BY JMA SCALE: 1 "=20' DRAWING NO. C- 1 SHEET 1 OF 4 JAVAID M. ASLAM RCE NO. 32779 DATE: Page 64 of 70 / / I I I I I F TURE- D Y ArL 0 co N a M C. ;,. Q 152.16 2 / FL I 72. 6 N.I OC - P/ z J ul 75.43 NI F ' J J 17 .11 ➢ P 177.70X\ 2 .74 O a P pg\ 180.I WF 181.43 SMN NO WORK SHALL BE DONE ON THIS SITE UNTIL BELOW AGENCY IS NOTIFIED OF INTENTION TO GRADE OR EXCAVATE. DIGAI RT CALL 811 or 1- 800- 422- 4133 2 Working Days Before You Dig WWW.CALL81 l .COM BENCH MARK: ELEV. 200' (ASSUMED) FD. BOLT 2" DN ON THE INTERSECTION OF DERRINGER LANE AND RIDGE LINE ROAD. LOT 61 PER O.R. 20191396529 i N11'07'34"W _ - 453.87' - \\\ \\ � ` \\ \`\ \\ \\ \ \\ \ \ \ PROPERTY LINE COV \\ \\ \ \ \\ \ \ \ \ _ _ � _ _ -77 1.02 E�\ \ \ \ 1 \ \� \ \\ \` \\ \ R\ \ 1 - - - - LOT 62 PER O.R. 2019396529 ` � W'LY LINE 1\22.\ \ \ \\\ D \�� \ \ \\����� \\ \ \ ` ? ���� 7 . 1 RUA = 0.49 AC C 181.6�11�/ r 61.59 PARCEL 1 O I� T 14 1 1� 1� GI , 1 T GP o a I 9. i 613.03 29. 6 1 \ 1 X\ \ \ �T�1 I I I I � I I 11 x71.2� i ( ��' DE 125.8� I \ 1 \ \ \117.51 \ \ TIC I I I I 190. 2 ,N I Tp115 1 1 I I NC I (� I I I X\ N��\123.�2�� I I 1 1 2.74 1` 1 I � TOP.48 , V G,� I I 1 .O13 � I I � � 11 I I I I I I I � 2 .1 I I I I I I N%p I 1 1 1 I 1 1 806.3 I I I I I I I L+ „ I l l '�/ I I 11 I\ (M V �Q £ I I I � I 1 l rY I 11` ) I� 7.5 I I 0. 6 / / I I I I \ lx // v, I � I I � G 3g3 ' ; 11 11 II pj8� I I G j1 7 y12S21 l /o' I I I 1 I I 1 1 I 980 I 1 \\ \\ \\ x iT V T�E i ill c� I I y2/96 I 0 I I I I Gp ( t(6�.77.1 l I / I TO //// I I Icn ( CD i // Cb G / J I XI , / \ \ 0.21 i 1 1 1 I I I I I cn I J 1 I l I l (63!05 \\ 1 / X/1Y75 �/ I I I I I I ( / l/ l ! I' IP 1 1 / )GP I I I I �I �.£ 2 I I I < < GP 1/2 o / O , I (N) PARCEL 1 1 19a.�5 111 1 / 0 1 GP I ; < < �s /f P, 6 \ / 11 / ,� LOT 62 / /� \ X ( o 1 I AREA = 1.11 AC / 76.�1\8 v cr l v I G I I I I GP Gp /TOEi i i i i i i RUA = 0.49 AC \ vavvv --� X � j 41 .5�4 / NI OEI i I %X 1.82i /G l I l I i 1 1 1 '\C \ l \ GJp / i / i i i l 369.11 PROPERTY LINE I ..r �\ \ \ \ \ ` \ y\\ \ \ O \ \ \ \ �O/5 / 120431"W _ s\ \ ` ` \ � / , i / N � Fi L 8 / / / �1 -7 6' \ 1/16.6GO PTO I I i ; ; I (N) PARCEL 2 oL2 I i I I / / ( I I � I o I / I o / S F ' / 1 I W I LOT 62 I i i I I i i I i co„ i = AREA = 1.19 AC RUA = 0.00 AC 1 ��, R- \ x 06. 7 T° IV 1 1�.gOTIW UNDISTURBED AREA o \\\:��i��. • VJ \\ ` \ \ \ TIRE 1 1 \ 131341 \ \ 1 \P O P \ \ \ O CSC \ \\ 1\19�8� \ \ \ \ \\\\ \ \ \\ \ \ \ -- \ - \\ f------------ \\\\ \ \------------ - \\\ 8'-------------------- 1335 \ 4.61--------------- \ 2\3 \ \� _� ----- l � 1 1 401, -- E LOT 63 ` GP TRACT 30091 X111.75 1.78 AC GP X113.50GP �Q 9P ��Lo�iOc'S0, 9,0 9�J 'po TOPOGRAPHIC SURVEY SOURCE: SURVEYOR: GOLDEN LAND ENGINEERING INC. TEL: (714) 671-1050 XT16 DATE: 1 1-05-2016 liiiiiaz� SCALE: 1 "= 20' 20 10 0 20 40 SCALE: 1 "= 20' oil ('nm Tueti-Q stir_ CIYVIIICCRII412, JVRYGIIIYV 732 NO. Diamond Bar Blvd., Suite 128 Diamond Bar, California 91765 (909) 396-1131 Q�OFESS/pH �JPND M. A? 'lF CI V \L pQ` �0F Ck0 JAVAID M. ASLAM RCE NO. 32779 DATE: CITY OF c DIAMOND BAR C A L I F 0 R N I A GEOTECHNICAL ENGINEER'S STATEMENT OF COMPLIANCE ENGINEER GEOLOGIST RCE DATE 105.00' / / NATURAL DRAINAGE COURSE FLOOD HAZARD AREA (LOCATED IN RUA) / / / 0 I / / / CO I / I CONSTRUCTION NOTES: Ol PROTECT EXIST IMPROVEMENT IN PLACE. 02 JOIN TO MATCH EXISTING SURFACE. 03 REMOVE EXIST. IMPROVEMENT AS SHOWN. 04 CONSTRUCT CMU RETAINING WALL WALL PER STRUCTURAL PLANS AND SOILS REPORT RECOMENDATION H=1'-4' MAX. WALL BACK DRAINAGE PER DETAIL NO. 1 ON SHEET C-3. 05 CONSTRUCT 5" THICK CONCRETE DRIVEWAY SURFACE OVER COMPACTED SUBGRADE PER DETAIL NO. 2 ON SHEET C-3. 06 CONSTRUCT 4" THICK CONCRETE WALKWAY SURFACE PER ARCH. PLANS. 07 CONSTRUCT CRIB WALLS AT SLOPE PER ARCH. AND STRUCTURAL PLANS. WALL H=4'. 08 CONSTRUCT 12" X 12" GRATE TYPE CATCH BASIN WITH ROCK/GRAVEL BOTTOM AS SHOWN PER DETAIL NO. 3 ON SHEET 3. 09 CONSTRUCT 4" DIA PVC DRAINAGE PIPE AS SHOWN PER PLAN. 10 PROVIDE FILL AND GRADE AREA PER SOILS REPORT RECOMMENDATIONS. 11 CONSTRUCT ROCK RIPRAP AS SHOWN PER PLAN & DETAIL NO. 4 ON SHEET C-3. PUBLIC WORKS DEPARTMENT F D I A M O N D B A R STATE OF CALIFORNIA IDAVID G. LIU, P.E. CITY ENGINEER RCE 44053 DATE I PLANS REVIEWED FOR THE CITY OF DIAMOND BAR BY: PRELIMINARY GRADING PLAN DATE LEGAL DESCRIPTION PARCEL 2 OF TPM NO. 83773 AND PORTION OF ADJUSTED LOT 62 PER LLA-18-79, DATED 12/13/19 APN: 8713-004-016 OWNER: MR. & MRS. ARUN JAIN SITE ADDRESS: 23901 RIDGE LINE ROAD DIAMOND BAR, CA. 91765 DRAWN BY EJ CHECKED BY JMA SCALE: 1 "=20' DRAWING NO. C-2 SHEET 2 OF 4 Page 65 of 70 q DL S/PL STREET 170 165 160 155 150 145 140 135 130 185 180 175 170 165 160 155 150 145 140 NO WORK SHALL BE DONE ON THIS SITE UNTIL BELOW AGENCY IS NOTIFIED OF INTENTION TO GRADE OR EXCAVATE. DIGALERT CALL 811 or 1-800-422-4133 2 Working Days Before You Dig WWW.CALL81 l.COM 170 165 160 155 150 145 140 135 130 SECTION A -A HORIZ.: 1 "=20' VERT.: 1 "=10' B DG W/PL w I I DL N/PL 14' 25' 60' 10' TO E PL I I I LS 1 I GARAGE SFR FI I I / I � I I MIDDLE FF=171.75 GFF=170.75 166.00 6 _ _ FL EG — 160 0 �o --------- FLI -- --- ` I - -I RET WALL PER ARCH PLANS I EG I SECTION B-B HORIZ.: 1 "=20' VERT.: 1 "=10' BENCH MARK: ELEV. 200' (ASSUMED) FD. BOLT 2" DN ON THE INTERSECTION OF DERRINGER LANE AND RIDGE LINE ROAD. TOPOGRAPHIC SURVEY SOURCE: SURVEYOR: GOLDEN LAND ENGINEERING INC. TEL: (714) 671-1050 XT16 DATE: 1 1-05-2016 185 180 175 170 165 160 155 150 145 140 REVISION L=10' RIP —RAP CMU RET. WALL ° e.\\ \ \\\� 6" CONIC CURB \�\ 4" THICK FL PER PLAN 4" PVC DRAIN PIPE \� CONC. SWALE \\ " 8 DIA. ROCKS FL PER PLAN \\= " W/2" MAX. SPACINGS \� 2 EXIST GROUND 1% MIN_ FLOW LINE 1� % MIN FIG tmr=_7F p S=Od50% MINI— 4" THICK CONC. SWALE WITH 6X6-10/10 WFF REINFORCEMENT �\ 12" THICK GUNITE RETAINING WALL 90% COMPACTED SOIL BACK DRAINAGE DETAIL NO. 1 N.T.S. RIP -RAP - DETAIL NO. 4 N.T.S. a a a as III —III— IIII I (— NOTE: WEAKENED PLAN JOINTS IN CONCRETE PAVEMENT SHALL BE SAWED JOINTS AND SHALL HAVE 10' MAXIMUM SPACING. SAW CUT - CONTROL JOINT (TRANSVERSE OR LONGITUDINAL) a #3 0 18" O.C. EW a a ae e a a a a a a a 4 :07. COMPACTED SUBGRADE DRIVEWAY CONCRETE PAVEMENT DETAIL NO.2 N.T.S. PRECAST 12"X12" CATCH BASIN ALHAMBRA FOUNDRY NO. A-2012 OR EQUAL. SET TO GRADE WITHOUT CONC. BASE 1 % MIN. 001 4" PVC DRAIN PIPE METAL GRATE COVER FOSSIL FILTER FLO—GARD CATCH BASIN INSERT, MODEL FF-18D OR EQUAL 1 % MIN. CV 2-4" PERFORATED PIPES NONWOVEN GEO TEXTILE FABRIC DODO O UNDISTURBED SOIL MODIFIED GRAVEL BOTTOM CATCH BASIN DETAIL NO. 3 N.T.S. PLANS PREPARED BY: ff, CIVIL TRANS INC ENGINEERING, PLANNING, SURVEYING 732 NO. Diamond Bar Blvd., Suite 128 Diamond Bar, California 91765 (909) 396-1131 /QROFESS/pN /���•OPJP\D M G9 NO. 32779 TF p I V \�= p� �pF C A�-� 4" PVC INLET CITY0F C I T Y DIAMOND BAR C A L I F 0 R N I A GEOTECHNICAL ENGINEER'S STATEMENT OF COMPLIANCE SOIL ENGINEER RCE DATE PUBLIC WORKS DEPARTMENT O F D I A M O N D STATE OF CALIFORNIA DAVID G. LIU, P.E. CITY ENGINEER RCE 44053 DATE PLANS REVIEWED FOR THE CITY OF DIAMOND BAR BY: ENGINEER GEOLOGIST RCE DATE I SECTIONS AND DETAILS LEGAL DESCRIPTION PARCEL 2 OF TPN1 NO. 83773 AND PORTION OF ADJUSTED LOT 62 PER LLA-18-79, DATED 12/13/19 APN: 8713 004 016 OWNER: MR. & MRS. ARUN JAIN SITE ADDRESS: 23901 RIDGE LINE ROAD DIAMOND BAR, CA. 91765 DATE DRAWN BY EJ CHECKED BY JIMA SCALE: 1 "=20' DRAWING N0. C_3 SHEET 3 OF 4 JAVAID M. ASLAM RCE NO. 32779 DATE: Page 66 of 70 NO WORK SHALL BE DONE ON THIS SITE UNTIL BELOW AGENCY IS NOTIFIED OF INTENTION TO GRADE OR EXCAVATE. DIGAI�ERT CALL 811 or 1— 800— 422— 4133 2 Working Days Before You Dig WWW.CALL81 l .COM _-_----- PL Iomnr i i�ir N i i NLW KLIAININU WALL NEW DRIVEWAY TW 162.00 BW 158.00 6, ; FILL L TW 155.00 MIDDLE FF 172. BW 151.00 25' 6, �// TW 149.00 -' PL BW 145.00 TW 143.00 BW 139.00 /%/�/�/%/� ,,--'" 40' NJ SLOPE 36% CAISSON DEPTH FOR DAYLIGHT REQ. AVERAGE SLOPE 35% DAYLIGHT 40 FT HORIZ 154 3=51.33 FT MAX 40 FT BENCH MARK: ELEV. 200' (ASSUMED) FD. BOLT 2" DN ON THE INTERSECTION OF DERRINGER LANE AND RIDGE LINE ROAD. TOPOGRAPHIC SURVEY SOURCE: SURVEYOR: GOLDEN LAND ENGINEERING INC. TEL: (714) 671-1050 XT16 DATE: 1 1-05-2016 REVISION SECTION C-C HORIZ.: 1 "=20' VERT.: 1 "=20' CIVIL TRANS INC ENGINEERING, PLANNING, SURVEYING 732 NO. Diamond Bar Blvd., Suite 128 Diamond Bar, California 91765 (909) 396-1131 /QROFESS/pN D M NO. 32779 C I T V 0 F c DIAMOND BAR C A L I F 0 R N I A GEOTECHNICAL ENGINEER'S STATEMENT OF COMPLIANCE SOIL ENGINEER RCE 185 180 175 170 165 160 155 150 145 140 135 130 125 120 115 110 105 100 95 90 85 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 0 PUBLIC WORKS DEPARTMENT I T Y O F D I A M O N D B A R STATE OF CALIFORNIA DATE LEGAL DESCRIPTION PARCEL 2 OF TPM NO. 83773 AND PORTION OF ADJUSTED LOT 62 DAVID G. LIU, P.E. CITY ENGINEER RCE 44053 DATE PER LLA-18-79, DATED 12/13/19 PLANS REVIEWED FOR THE CITY OF DIAMOND BAR BY: W ' IWi1Ff9•Q01LIZQ�111 OWNER: MR. & MRS. ARUN JAIN SITE ADDRESS: 23901 RIDGE LINE ROAD DIAMOND BAR, CA. 91765 JAVAID M. ASLAM RCE NO. 32779 DATE: ENGINEER GEOLOGIST RCE DATE SLOPE SETBACK SECTION DATE DRAWN BY EJ CHECKED BY JMA SCALE: 1 "=20' DRAWING N0. C-'4 SHEET 4 OF 4 Page 67 of 70 Agenda Item #: 6.1 Meeting Date: September 8, 2026 PLANNING COMMISSION AGENDA REPORT TO: Chair and Members of the Planning Commission FROM: Greg Gubman, Community Development Director SUBJECT: Project Status Report RECOMMENDATION: Staff recommends the Planning Commission receive and file the Project Status Report dated September 8, 2026. BACKGROUND/DISCUSSION: The Project Status Report has been prepared and is being processed for receipt and filing. PREPARED BY: Arlene Laviera, Administrative Coordinator, Community Development ATTACHMENTS: 09-8-26 Project Status Report Page 68 of 70 Project Status Report September 8, 2026 CITY OF DIAMOND BAR COMMUNITY DEVELOPMENT DEPARTMENT PROPERTY LOCATION PLANNING COMMISSION REVIEW File # AP Applicant PC 09/8/26 CC 09/15/26 PC 09/22/26 CC 10/6/26 PC 10/13/26 CC 10/20/26 23901 Ridge Line (2-lot Subdivision) TPM PL2022-119 MN Pete Volbeda PH PH 667 Brea Canyon (Adult Learning Center) CUP PL2026-31 MN Mosaic Support Center PH 701 Brea Canyon (Fitness Studio) CUP PL2026-37 RL Ashley Vierra Fitness PH ADMINISTRATIVE REVIEW PENDING ITEMS Property Location File # AP Applicant Status 721 & 725 Brea Canyon (Children's Learning Center) CUP PL2026-30 MN Lifetastic Learning Under review 2720 Broken Feather (New Single -Family Residence) DR PL2025-34 MN Yao Pan Second incomplete letter sent 6/12/26 — waiting for additional information 1200 Chisolm Trail New single-family residence DR PL2026-12 RL Bo Sundius Second incomplete letter sent 7/24/26 — waiting for additional information 1741 Derringer Lane (New Single -Family Residence) DR PL2025-62 MN Ralph Poon First incomplete letter sent 9/11/25 — waiting for additional information 2001 Derringer Lane 2-lot subdivision TPM 83036 PL2021-46 MN Gurbachan S. Juneja Under review 2845 S. Diamond Bar (Car wash) DR, CUP, CSP PL2026-36 MN PM Design, Inc. First incomplete letter sent 7/30/26 — waiting for additional information 2583 Indian Creek New single-family residence DR PL2025-67 RL Mike Lou Third incomplete letter sent 5/5/26 — waiting for additional information 2595 Indian Creek New single-family residence DR PL2025-66 RL Mike Lou Third incomplete letter sent 5/6/26 — waiting for additional information 1400 Montefino Ave (49-unit for -sale development) GPA, ZC, TTM, DR, & CUP PL2025-29 MN Sarah Klaustermeier Under review LEGEND PH = PUBLIC HEARING AP = ASSIGNED PLANNER PC = PLANNING COMMISSION CC = CITY COUNCIL D = DISCUSSION ITEM Page 69 of 70 Project Status Report CITY OF DIAMOND BAR Page 2 September 8, 2026 PENDING ITEMS (continued) Property Location File # AP Applicant Status SB9 & Reasonable Accommodations DCA PL2019-43 MN City of Diamond Bar Under Review Ordinance Page 70 of 70