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r <br /> • y <br /> tl <br /> i <br /> PURPOSE AND SCOPE <br /> RAH Environmental, Inc (RAH) , and their driller Western Geo- <br /> Engineers (WEGE) hand augered three soil borings inside the <br /> forklift shop These borings were augered in order to define <br /> the extent of the soil and ground water contamination under the <br /> shop This work was done on February 10, 1995 , as a follow-up to <br /> the work performed by Tri-Valley Growers and their consultant RAH <br /> on November 28 , 1994 <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 projected Section <br /> 3 , T4N, R5E, of the MDB&M at an elevation of approximately 11 <br /> feet 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 Raver See Exceltech, Inc report of <br /> November 9, 1987 for further discussion of geology and for well <br /> reconnaissance . <br /> The soils are made up of unconsolidated clayey salts, salty clay, <br /> sandy clays, clay sands and salty sands Of most importance, at <br /> this site, is the salty sand aquifer between 14 and 19 feet below <br /> the surface It was noted in the log of MW4 , that visible <br /> product had been present at the top of this aquifer During the <br /> maaority of the time when the site had been monitored, the top of <br /> this sand had been below the top of ground water This .indicates <br /> that the aquifer is confined During those time periods that the <br /> ground water had fallen below the top of the sand in MW4 , as a <br /> result of pumping, the reported hydrocarbon concentration levels <br /> have increased. <br /> PREVIOUS WORD AT THE SITE <br /> Two gasoline underground storage tanks were removed from the site <br /> during January and February 1987 Appreciable amounts of <br /> hydrocarbon contamination were found in the soil samples taken <br /> during the tank pull After the tank pull , four ground water <br /> monitor wells were installed by Exceltech Two additional monitor <br /> wells were later installed by Water Work <br /> Of these wells, only MW4 has ever shown a significant amount of <br /> hydrocarbon contamination. The other wells provide an outer <br /> limit to the hydrocarbon contamination on the site <br /> A ground water recovery system was placed into operation on May <br /> 13 , 1991 The system was set to pump water from MW4 <br /> 1 <br />