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Home My WebLink About20210901121149160.pdf.pdfENVIRONMENTAL GEOTECHNOLOGY LABORATORY, INC. r° .., S & W Development` T1-Eti e1y June 29, 2000 20547 Walnut Drive, Suite D Walnut, California 91789 Attention: Mr. Simon Shum Subject: Response to the City Review Letter dated June 23, 2000, to Report of Geotechnical Engineering and Geological Investigation 2501 Crowfoot Lane, City of Diamond Bar, California EGL Project No.: 99-181-006EG References: 1. Response to the City Review Letter dated May 19, 2000 for the subject site, by EGL, Proejct No.: 99-181-006EGR, dated May 30, 2000 2. Response to the City Review Letter dated March 21, 2000 for the subject site, by EGL, Proejct No.: 99-181-006EGR, dated April 12, 2000 3. Reports of Geotechnical Engineering and Geological Investigation for the subject site by EGL, Project No.: 99-181-006EG dated August 30, 1999 4. "Final As -Graded Geologic Report, Rough Grading Completed, Tract 30577, Diamond Bar, California", by Robert Stone & Associates, Job No.: 1-68-303-44 dated September 24, 1971 5. "Redesign of Proposed Buttress Grading, Crowfoot Lane, Lot 61 and 62, Tract 30577, Diamond Bar, County of Los Angeles", by Robert Stone & Associates, Inc., Job No.: 1-68-303-33, dated June 11, 1970 Dear Mr. Shum: This addendum provides EGL`s response to the City of Diamond Bar Soil/Geology Review letter, dated June 23, 2000, for the subject site. For your reference, the review letter is attached and the responses to each item are presented below. Item 1 Based on the referenced No. 5 report, a shear key and stabilization fill was placed in 1970 to stabilize the existing north-northeast facing slope. The along bedding shear strength parameters provided in the referenced No. 5 report are lower than the values obtained from our investigation results. The boring, B-1 (referenced No. 2 report) encountered approximately 9 feet of slopewash should be compacted fill) which coincides with the previous grading work.. It is believed that the existing shear key and stabilization fill would provide necessary slope stability of the existing slope. 11823 Slauson Avenue, Unit 18, Santa Fe Springs, CA 90670; Phone: 562-945-0689; Fax: 562-945-0364 E-MAIL: EGL88@AOL.COM S & W Development Page 2 EGL Project Number: 99-181-006EGR1 June 29, 2000 Item 2 The recommended key location was placed according to the grading plan prepared by EGL Associates, Inc. The depth of the key was 6 to 8' below existing grade (in lieu of 3' recommended in the grading plan). The key was deepened due to the disturbance and loosening near the surface. The key was placed in the previous stabilization fill which consists predominantly siltstone fragments in sandy matrix. A 4" perforated PVC subdrain pipe was placed according to our recommendations and the grading plan. The outlet of the pipe was not constructed at this stage. A riser pipe was placed to indicate the end of the subdrain pipe. Item 3 Comply This opportunity to be of service is sincerely appreciated, and if you have any questions or need any clarifications pertaining to this report, please call the undersigned. Respectfully submitted, Environmental Geotechnology Laboratory Inc. (EGL) Hank H. Jong, Ph.D., tEG 1646, RGE 2305 Principal QROHSSO r N0.2305 Exp. j21$/cZ Eat•----- TEC KN G Q 9TFOF CAO F OF CA1 -i 11823 Slauson Avenue, Unit 18, Santa Fe Springs, California 90670; Phone: (562) 945-0689; Fax: (562) 945-0364 E-MAIL: EGL88@AOL.COM furl co o3 ui: lop L.aru of uiamona bar :JU8-Ub1-3117 P. 1 GEOTECHNICAL REVIEW SHEET LEIGHTON AND AR OCIATES, INC. O CITY OF DIAMOND BAR DEPARTMENT OF ENGINEERING Tract(s) Lot 6I Tract 30577 Date June 23, 2000 Parent Tract Location/Owner Site Address - 2501 Crow Foot Lane Geologist Environmental Geotechnical Laborato f Developer Soils Engineer Environmental Geotechnical Laborato Engineer/Arch. REVIEW OF: Grading P.C. No, Geologist Report(s) Dated Soils Report(s) Dated X Geology and Soils Report(s) Dated. Mayo, 2000 and subsequent revisions. X Other Grading and drainage plan dated A riI i2.2000 X Previous Submittals Dated Aril 12, 2000 and Au ust 30 1999 ACTION: Plan/Report is geotechnically approved Plan/Report is geotechnically approved subject to conditions below. REVIEW COMMENTS: 2910164-134 X Plan/Report not approved for reasons below X Submit Plan/Report for recheck. Includ a coyy of this review. Previous reports regarding the slope and stability key constructed for Lot 61, Tract 30577, is available in our office and in the City of Diamond Bar files (Stone & Associates, June 11, 1970). The consultant must review this report and comment on the adequacy of the slope stability. Based upon a site visit, it appears that the site is being graded. Has EGL been providing geologic and soils engineering observation and testing? Discuss the geologic conditions exposed. It appears that the previously recommended stability key has been constructed. Was this key mapped and accepted by EGL, as previously recommended? Was subdrainage installed? gun CIO OIJ ui:IUP k uir.0 at uiamona tsar aua--t5t3r--111-1 f .c 2910164-134 We have received several versions of the May 30, 2000, report concerning 2501 Crow Foot Lane. Provide a single revised document incorporating all revisions. Reviewed by Date Jun e 23.2000 David C. Smith Reviewed by e ADate June 23 2000 Philip A. Buchiarelli 2 - GEOTECHNICAL REVIEW SHEET LEIGHTON AND ASSOCIATES, INC. FOR CITY OF DIAMOND BAR DEPARTMENT OF ENGINEERING 2910164-134 Tract(s) Lot 61 Tract 30577 _— Date July 7 2000 Parent Tract Location/Owner Site Address ' 2501 Crow Foot Lane Geologist Environmental Geotechnical Laboratory Developer Soils Engineer Environmental Geotechnicai Laboratory_Engineer/Arch. REVIEW OF: Grading P.C. No. Geologist Report(s) Dated Soils Report(s) Dated X Geology and Soils Report(s) Dated June 29 2000 X Other Grading and drainage plan dated April 12 2000 X Previous Submittals Dated Aril 12 2000 August 30 1999 and May 30 2000 and subse uent revisions ACTION: Plan/Report is geotechnically approved X 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. Show the location of all keys including the key previously constructed on the as -built geotechnical map. O A single, revised document incorporating all versions of May 30, 2000 report was not received. Please provide. Reviewed by 4'z Date Jul 7, 20QQ Philip A. Buchiarelli GCr ", .r/Z- 14,g- &?-,-04 GEOTECHNICAL REVIEW SHEET LEIGHTON AND ASSOCIATES, INC. FOR CITY OF DIAMOND BAR DEPARTMENT OF ENGINEERING 2910164-134 Tract(s) Lot 61 Tract 30577 - Date July 7 2000 Parent Tract Site Address ' 2501 Crow Foot Lane Location/Owner Geologist Environmental Geotechnical Laborato Developer Soils Engineer Environmental Geotechnical Laboratory Engineer/Arch. REVIEW OF: Grading P.C. No. Geologist Report(s) Dated Soils Report(s) Dated X Geology and Soils Report(s) Dated June 29 2000 X Other Grading and drainage plan dated April 12 2000 X Previous Submittals Dated April 12, 2000 August 30, 1999, and May 30, 2000 and subsequent revisions ACTION: Plan/Report is geotechnically approved X 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. Show the location of all keys including the key previously constructed on the as -built geotechnical map. A single, revised document incorporating all versions of May 30, 2000 report was not received. Please provide. r Reviewed by Date Jul 7 2000 hilip A. Buchiarelli