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'0IEE & PIERCE inA <br /> consulting Engineers <br /> CIVIL• ENVIRONMENTAL•AGRICULTURAL <br /> 546 ABBOTT ST,STE 20 135 SOUTH FIFTH AVE,STE C <br /> SALINAS,CA.93901-4373 OAKDALE,CA.953614092 <br /> (831)758-0096 PHONE (209)848-8270 PHONE <br /> (831)758-1213 FAX (209)848-8274 FAX <br /> boelichWeeandoierce.com Ilane(aleeandoierce.com <br /> October 15,2010 <br /> Ms. Lori Duncan RECIE vn ED <br /> San Joaquin County <br /> Environmental Health Department <br /> 600 East Main Street OCT 1 8 2010 <br /> Stockton, CA 95202-3029 <br /> EIVVihsOivacNT HEALTH <br /> PERMIT/SERVICES <br /> Subject: Work Plan for Subsurface Investigation <br /> 2911 East Fremont Street, Stockton, CA <br /> Dear Ms. Duncan: <br /> Lee & Pierce, Inc. (L&P) has been contracted by Fremont Gate LLC to conduct a subsurface investigation <br /> at the United Rentals facility at 2911 East Fremont Street, Stockton, California to further evaluate <br /> petroleum hydrocarbon contituents discovered in soil samples collected during a previous investigation at <br /> the site. <br /> Site Description <br /> The property consists of roughly 3.84 acres encompassing San Joaquin County Assessor's Parcel Numbers <br /> (APNs) 143-080-55 and 143-080-57. The property is relatively flat and sits at an elevation of <br /> approximately 25 feet above mean sea level, in an area of Stockton, California zoned for commercial, <br /> business. Figure 1 presents the site location. <br /> The property currently houses an equipment rental service company, United Rentals, and includes a <br /> structure of approximately 30,000 square feet, an exterior storage yard, paved parking areas, and <br /> landscaped grounds. The structure contains an inactive equipment wash area with associated drains and a <br /> clarifier in the southernmost '/3 of the building, and an active wash rack, drains and a clarifier in the <br /> northernmost '/3 of the building. The wash racks, drains, and clarifiers are reportedly connected to the <br /> municipal sewer system. Figure 2 presents a site plan/aerial photograph showing the primary features of <br /> the site. <br /> The area to be investigated is near the inactive clarifier and wash drains in the southernmost %3 of the <br /> building, <br /> Regional Geology and Hydrogeology <br /> The subject site is located within the San Joaquin Valley, a broad structural trough bounded by the Sierra <br /> Nevada and Coast Ranges of California. The San Joaquin Valley, which comprises the southern portion of <br /> the Great Valley of California, has been filled with up to 30,000 feet of sedimentary deposits ranging in age <br /> from Jurassic to Holocene. Sediments in the eastern valley, derived from the erosion of the Sierra Nevada, <br /> EN10759 WP1010 <br />