Loading...
HomeMy WebLinkAbout20200909113114014en .0n e0 qifteefiq' C aC Inca July 22, 1996 Mr. Ken Bailey DIAMOND BAR EAST PARTNERS 3480 Torrance Boulevard, Suite 300 Torrance, California 90503 Subject: Final Geotechnical Report for 2828 Bentley Way, Lot 6, Tract 47851, Crystal Ridge Estates, Diamond Bar, California HGEI Project No. 91-02-0109A-6 References: See Attached List Dear Mr. Bailey: This letter/report presents a summary of observations and testing performed by Harrington Geotechnical Engineering, Inc. on the subject lot since the completion of tract rough grading. This work was performed on an as -called basis as scheduled by your personnel. Exterior Utility Trench Backfills Following the placement and compaction of the exterior utility trench backfills, the entire lengths of the water, sewer and common trenches were probed with a smooth steel rod for uniformity and randomly tested for compaction. The approximate trench locations are shown on the attached Trench/Test Location Plan, Plate A, and test results are summarized in Table II. Maximum Dry Unit Weight/Optimum Moisture Maximum dry unit weight/optimum moisture relations were established in the laboratory in accordance with ASTM Test Method D1557 for the materials tested at the site. Results obtained are summarized in Table I. Field Unit Weight/Relative Compaction In -place dry unit weights for the compacted backfills were determined by the drive -cylinder method (ASTM D2937). Test results are summarized in Table II. These results were compared to the maximum dry unit weights obtained in the laboratory to determine the relative compaction values listed in the table. The approximate test locations are shown on the attached Trench/Test Location Plan, Plate A. 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 HGEI Project No. 91-02-0109A-6 July 22, 1996 Page 2 Conclusion Based upon the observations and/or results of tests performed by representatives of this firm and reported herein, it appears that the trench backfills described herein are in general conformity with our recommendations and are therefore deemed adequate for the various intended uses. Limitations/Closure Members of our staff were present at various times to perform observations and tests as reported herein. This service was performed in accordance with generally accepted geotechnical engineering principles and standards of practice. No further warranty, express or implied, is offered. In addition, no opinion is expressed or implied related to items of work not observed and/or tested by representatives of this firm. Our last visit to the site was on January 3, 1996, and we assume no responsibility for additional geotechnical-related work performed subsequent to this date. We appreciate this opportunity to be of service and trust this report meets your immediate requirements. Please do not hesitate to contact our office in the event you have any questions or require further assistance at this time. Very truly yours, HARRINGTON GEOTECHNICAL ENGINEERING, INC. Prepared By: r J. Stanley Schweitzer, P. E. Senior Geotechnical Engineer JSS/DPH:ld Attachments Reviewed By: Don P. Harrington, Sr., P.E. President Distribution: Addressee (3) City of Diamond Bar, Engineering Department (3) Attn: Rose Manela CAD0CSADBAR\0109A-8. FN L DIAMOND BAR EAST PARTNERS HGEI Project No. 91-02-0109A-6 July 22, 1996 o-n- NOTES: DC = Drive -Cylinder Method, ASTM D2937. W = Water Line Trench C = Common Trench S = Sewer Line Trench J DIAMOND BAR EAST PARTNERS HGEI Project No. 91-02-0109A-6 July 22, 1996 Page 4 ooi 1) "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. 2) "Results of Expansive Index and Water Soluble Sulfate Tests for Lots in Vesting Tentative Tract 47851, Diamond Bar, California," Dated December 11, 1995, Prepared by HGEI, Project No. 91-02-0109A. 3) Geotechnical Review of Precise Grading Plan for the Subject Lot, Dated October 13, 1995, Prepared by HGEI, Project No. 91-02-0109A-6. 4) Precise Grading Plan for the Subject Lot, Dated September 14, 1995, Prepared by Pfeiler & Associates, Inc. Job No. 87J01613-006A. fit':"': j luuu. 0 Ln Ui03, 0 Cu 0 ir M 00mlz 11 ro ci cY 0 n lac EXIST. 301-01' L-J i EASEMENT FOR SLOPE PA D EL luCt- AND DRAINAGE MAINT, PURPOSES TO BE ON RESERVED IN DOCS. Alf N 49'325'0'?, E RESTRICTED FRONT SETBACK LOT 7 PAD EL:999,1 LEGEND 0 APPROX. TEST LOCATION C COMMON S SEWER W WATER REF: GRADING PLAN BY PFEILER & ASSOCIATES ENGINEERS Ve0T2= nn8. its M8 N. Batavia &- &c. N - Orwl8c. C& T&5 (714) 6373093 SCALE: 1" =20'± 2828 BENTLEY WAY DRAWN By 4ByDATE: JULY 196 LOT 6, TRACT 47851 REVISED RAwr, TRENCH/ TEST LOCATION PLAN DRAWING NUMBER PROJECT NO. 91-02-0109A-6 PLATE A 17 x 22 MINTED ON No. l000m cLEARPRiNT