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03/16/99 TUE 12:46 FAX 510 686 3099 SECOR CONCORD IM002 <br /> SECOR <br /> March 16, 1999 international lnco or ited <br /> Ms.Margaret Lagorio <br /> San Joaquin County Environmental Health Division <br /> 1601 East Hazelton Avenue <br /> Stockton,California 95201 <br /> Re: Work Plan-Soil Investigation <br /> William Lyon Homes,Inc.Stonebridge Development,Lathrop <br /> Dear Ms.Lagorio: <br /> Secor International Incorporated(SECOR) is pleased to present this work plan to perform a soil <br /> investigation in a proposed residential development at the William Lyon Homes,Inc. property in <br /> Lathrop, California (WLH development). This Work Plan addresses drilling, soil sampling, and <br /> reporting activities associated with the above mentioned property. This Work Plan is submitted <br /> to the San Joaquin County Environmental Health Division(SJCEHD)on behalf of WLH. <br /> Scope of Work <br /> Task 1: pre-Field Activities <br /> Following approval of this Work Plan and issuance of drilling permits by the SJCEHD, SECOR <br /> will proceed with preliminary field activities. SECOR will prepare a Site-specific Health and <br /> Safety Plan (HASP)to address the proposed scope of work. The proposed boring locations will <br /> be cleared by the land owner and Underground Services Alert(USA)will be notified. <br /> Task 2:Drilling and Sampling Activities <br /> To investigate the soil beneath the site, a total of approximately ten (10)soil orings cored for <br /> will be <br /> advanced to a maximum depth of 20 feet below ground surface(bgs) Y <br /> lithologic description. Soil encountered will be logged by a SECOR geologist according to the <br /> Unified Soil Classification System(USCS),and soil samples will be screened in the field for the <br /> presence of volatile organic compounds (VOCs) using a Photoionization Detector (PID). Soil <br /> samples will be selected for chemical analysis based on PID readings and iithologic conditions. <br /> Soil borings may be advanced deeper based on field observations; however, borings will not be <br /> advanced beyond the water table. <br /> In order to collect soil samples, borings will be advanced utilizing a hydraulically and <br /> pneumatically driven direct-push sampler. The direct-push sampler will be equipped with a 1-518 <br /> inch outside diameter core barrel. As the drive casing is advanced,soil is driven into a 1-518 inch <br /> i diameter, three-foot-long sample barrel. Soil samples will either be collected in e fittedinside the <br /> 1-1/2 inch <br /> diameter by six-inch long stainless steel tubes or a three-foot long butyrate <br /> sample barrel. After being driven three feet, the sampling rods are removed from the borehole <br /> with a hydraulic winch. The tubes containing the soil samples will be removed from the drive <br /> sampler and retained for possible chemical analysis by covering the ends with Teflon tape and <br /> plastic end caps and placed in a cooler containing ice for transportation to the analytical <br /> laboratory. Soil samples selected for chemical analysis will be analyzed for volatile organic <br /> compounds(VOCs) in accordance with EPA method 8260. We estimate that approximately ten <br /> H.-V athrop DetWopment4ork plamdoc' <br /> I <br /> I 1390 willow Faris Road,Suite 360,Concord, CA 94520-5250 (925)686-9780 (:925)686-311.99 FAX www.xecorcrm <br />