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Home My WebLink About20200909113038027 (10)Hwilincton eothfkal ineefi , Inc. July 23, 1996 Mr. Kurt Nelson DIAMOND BAR EAST PARTN 3480 Torrance Boulevard, Suil Torrance, CA 90503 SUBJECT: Geotechnical Review of Precise Grading & Foundation Plans for 2832 Bentley Way, Lot 7, Tract 47851, Crystal Ridge Estates, Diamond Bar, California HGEI Project No. 91-02-0109A-7 REFERENCES: 1) Foundation Plan, Sheet 7, for the Subject Lot, Dated July 5, 1996, Prepared by R. Gould & Associates, Inc. and Timothy S. Racisz, A.I.A., Job No. 87J017b-07A 2) Precise Grading Plan for the Subject Lot, Dated July 9, 1996, Prepared by Heiler & Associates, Inc. 3) "Geotechnical Report of Rough Grading for Lots 1-17 and 20-48, Vesting Tentative Tract 47851, Diamond Bar, California," Dated October 11, 1994, Prepared by HGEI, Project No. 91-02-0109A. 4) As -Built Rough Grading Plan, Sheets 1 thru 7, Tract 47851, Revised October 18, 1995, Prepared by Hunsaker & Associates, Inc. 5) Standard Recommendations for Precise Grading, Slope Maintenance and Foundation Design for the Subject Tract, Dated September 20, 1995, Prepared by HGEI, Project No. 91-02-0109A. 6) Results of Expansion Index and Water -Soluble Sulfate Tests for Lots in Vesting Tentative Tract 47851, Diamond Bar, CA," Dated December 11, 1995, Prepared by HGEI, Project No. 91-02-0109A. Dear Mr. Nelson: In response to a request from R. Gould & Associates, we have reviewed the referenced precise grading and foundation plans for Lot 7 of Tract 47851. The referenced plans were reviewed from a geotechnical standpoint for conformance with our recommendations only. The plans were not reviewed as to the accuracy of dimensions, measurements, calculations or any non-geotechnical portion of the design. Based upon our review it appears that the referenced plans are in general conformance with our previous recommendations. During this review the following items were noted: 1. Based upon the comparison of the building pad elevation shown on the precise grading plan with the as -graded elevation shown on the rough grading plan it appears that only Batavia Business Center, 1938 North Batavia Street, Suite N, Orange, CA 92665 (714) 637-3093 - (800) 924-7645 - FAX (714) 637-3096 DIAMOND BAR EAST PARTNERS Project No. 91-02-0109A-7 July 23, 1996 Dino 7 minor cuts of less than one foot within the building area are planned. Minor grading outside the building limits is planned to improve surface drainage around the structure. 2. The graded descending slope at the rear of the property is part of a shear key fill that was constructed in order to increase the stability of the building pad. The building as shown is outside the special foundation setback line shown in Ref. 3 and deepened foundations will not be necessary in order to comply with setback requirements. 3. Tests performed following the completion of rough grading indicated a low expansion potential and negligible water-soluble sulfate concentration for the surface/near-surface soils as defined by the Uniform Building Code (see Ref. 6). 4. Foundation and floor slab design criteria for a Type II system presented in Table A of the rough grading report (Ref. 3) are considered applicable to this lot. 5. Sulfate resistant concrete containing Type V cement is not considered necessary for this lot (see Ref. 6). The note on the foundation plan, Sheet 7, regarding sulfate -resistant concrete may be deleted. 6. No retaining walls are currently shown on the precise grading plan. 7. The homeowner should be informed that future grading to alter the slopes should not be performed without review by a geotechnical consultant familiar with rough grading of the tract. In addition, the homeowner should be informed of the importance of slope landscaping, maintenance and erosion control and should be provided with guidelines that were appended to the referenced rough grading report (Appendix C, Ref. 3) and the standard recommendations (Ref. 5). We trust that this letter/report is adequate for your current needs. We have stamped and signed five copies of the precise grading plan and are returning them to Pfeiler & Associates for submittal to the City of Diamond Bar along with copies of this letter. If you have any questions or require further assistance, please call. Very truly yours, HARRINGTON GEOTECHNICAL ENGINEERING, INC. Prepared By By: Reviewed a 3 , J. Stanley Schweitzer, P E Don P. Harrington, Sr., P.5.— Senior Geotechnical Enginrt President Distribution: Addressee (1) R. Gould & AssociS'(1)` Pfeiler & Associates, Inc. (5) Attn: Lynn Mutch CADOCSMARTLANRV KOT7PRE.GRO GEOTECHNICAL REVIEW SHEET LEIGHTON AND ASSOCIATES, INC. FOR CITY OF DIAMOND BAR DEPARTMENT OF ENGINEERING Tract(s) 47851, Lot 8 Date October 16, 1995 Parent Tract Location/Owner Site Address 2838 Bentley Way Geologist Developer Diamond Bar East Partners Soils Engineer Harrington Geotechnical Engineer/Arch. Hunsaker & Associates REVIEW OF: Grading P.C. No. Geologist Report(s) Dated X Soils Report(s) Dated October 9 1995 Geology and Soils Report(s) Dated ACTION: X Plan/Report is geotechnically approved Plan/Report is geotechnically approved subject to conditions below. REVIEW COMMENTS: Plan/report not approved for reasons below Submit Plan/Report for recheck. Include a copy of this review. Reviewed by Date October 16 1995 David C. Smith Reviewed by I "al`'? Date October 16 1995 Kay St. Peters G A rc R I r'J G T Cp ram! 1'i 'Y) `/ @ P' e Hip LEIGHTON AND ASSOCIATES, INC