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W _ <br /> Y <br /> MURRAY & ASSOCIATES <br /> ENVIRONMENTAL SERVICES <br /> November 24, 1990 <br /> Lambert Barnum <br /> P.O. Box 1071 <br /> San Andreas, CA 95249 <br /> Dear Mr. Barnum: <br /> Re: Final Report - Stan Mori Ford Dealership, Tracy, California <br /> This letter report summarizes our work for the source removal and sampling activities at <br /> the subject site, and presents the results of all laboratory testing completed to date. The <br /> purpose of this work was to implement our Final Remedial Plan (FRP) and to obtain <br /> verification samples from the walls of the most recent excavation. Composite soil samples <br /> were also collected from the stockpile of contaminated soil to evaluate disposal options. <br /> { FIELD ACTIVITIES AND OBSERVATIONS <br /> Auger Borings <br /> To accomplish the tasks outlined in the FRP, five large diameter (10 and 30 inch) auger <br /> borings were drilled to a depth of approximately 15 feet to remove the remaining waste <br /> oil contaminated soil found adjacent to the service garage. A'�; cinity map showing the site <br /> location is presented in Figure 1. A Site Plan showing auger hole locations relative to the <br /> former underground waste oil tank is shown in Figure 2. All five of the auger borings <br /> encountered contaminated soil at a depth of approximately 7 to 12 feet below the surface. <br /> Borings AH-4 and AH-5, encountered the Ieast amount of contaminated soil and actually <br /> intersected clean fill material from the former tank excavation. Borings AH-1,AH-2 and <br /> AH-3, however removed approximately 6P yd-' of contaminated soil from a depth of 7 to <br /> nearly 12 feet below the surface. 6.o Y.(., <br /> The borings were drilled using a truck mounted hydrodigger equipped with 10 and 30-inch <br /> diameter solid flyte augers. Holes AH-1, AH-2, and AH-3 were drilled using the 30-inch <br /> diameter auger. Borings AH-4 and AH-5 were drilled at the intersections of AH-1 and <br /> ---_—_ ----- —AH-3;and AH-3-and-AH-2-respectively-with +he-10-:nch-auger: -—--- ---- -- -- , <br /> The drilling and soil removal activities were performed under the supervision of a <br /> California Registered Geologist who selected the boring locations and collected the <br /> verification soil samples. Approximately 75 cubic yards,of soil contaminated with primarily <br /> oil and grease was removed for subsequent off-site disposal.. <br /> 2252 Fort Point Drive,Gold River, CA 95670 (916)535-0839 FAX(916)852-1411 <br /> y: <br />