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#NMROf"WNTAL, INC. <br /> PURPOSE AND SCOPE <br /> In response to San Joaquin County, Environmental Health's letter <br /> of June 10, 1994 , Tri-Valley Growers and their consultant RAH <br /> Environmental, Inc. (RAH) , propose to drill a minimum of five soil <br /> borings in order to further define extent of the soil and ground <br /> water contamination at the Plant site. It is hoped that these <br /> borings along with the information gathered from prior <br /> investigations and treatment will allow for the formulation of a <br /> workable remediation plan. <br /> SITE LOCATION AND DESCRIPTION <br /> Tri-Valley Growers Plant T is located at 26200 Nowell Road, <br /> Thornton, California. The site is located in proaected Section <br /> 31 T4N, ME, of MDB&M at an elevation of approximately 11 feet <br /> above mean sea level (see Figures 1 and 2) . <br /> This Tri-Valley site is an operating cannery. <br /> GEOLOGY AND HYDROGEOLOGY <br /> The site is located on recent flood plain and channel deposits <br /> . derived from the Mokelumne River. See Exceltech, Inc. report of <br /> November 9, 1987 for further discussion of geology and for well <br /> reconnaissance. <br /> In the area of interest, the soils are made up of unconsolidated <br /> clayey silts, silty clay, sandy clays, clay sands and silty sands. <br /> Of most importance at this site, is the silty sand aquifer at <br /> between 14 and 19 feet below the surface. It was noted in the log <br /> of MW 4 , that visible product had been present at the top of this <br /> aquifer. During the majority of the time that the site has been <br /> monitored the top of this sand has been below the top of ground <br /> water, indicating that the aquifer is confined. During those time <br /> periods that the ground water has fallen below the top of the <br /> sand in MW4 , as a result of pumping, the reported hydrocarbon <br /> concentration levels had increased. <br /> PREVIOUS WORK AT THE SITE <br /> Two gasoline ur erground storage tanks were removed from the area <br /> of interest, 9 during January and February 1987 . Appreciable <br /> amounts of hydrocarbon contamination were found in the soil samples <br /> taken during the tank pull. After the tank pull four ground water <br /> monitor wells were installed by Exceltech. Two addition monitor <br /> wells were later installed by Water Work. <br /> • <br /> Class A License#592216 Fed I D #68-0219341 <br /> 3310 Swetzer Road Loomis CA 95650 <br /> FAX(916) 652-8955 e Office (916)652-5777 <br />