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San Joaquin Workplan <br /> 1.0 INTRODUCTION <br /> Augeas Corporation has prepared a workplan for the installation of three <br /> groundwater monitoring wells at the California Natural Products facility <br /> located at 1250 East Lathrop Road in Lathrop, California. The following <br /> proposal summarizes the details of our workplan. <br /> 2.0 PROJECT HISTORY <br /> The subject property is situated at 1250 East Lathrop Road in Lathrop, <br /> California. Lathrop is a small rural community located in the southern San <br /> Joaquin county.The subject property is situated in an area of mixed residential <br /> and commercial development. The property is owned by Dr. Cheryl Mitchell <br /> and her husband,Pat Mitchell and has been in the Mitchell family since 1948. <br /> The site contains both producing farmland and a food processing facility on <br /> approximately 14 acres of land in Section 26,Township 1 South,Range 6 East. <br /> In July of 1990,during a site renovation,one 1,000 gallon aboveground storage <br /> tank and associated product piping were removed.A spill report was filed with <br /> San Joaquin County Department of Environmental Health and with Antonia <br /> Vorster of the California Regional Water Quality Control Board.A groundwa- <br /> ter and soil contamination assessment workplan was prepared and submitted to <br /> the San Joaquin County Health Department in early August 1990. <br /> Near surface soils in the vicinity of the former tank contain levels of adsorbed <br /> gasoline.Assessment of the areal extent of soil contamination was completed <br /> in September of 1990.Figure 1 shows the location of soil borings,monitoring <br /> wells and an oval shaped area of contamination over 240 feet long by 180 feet <br /> wide. The contaminated zone begins at a depth of approximately 5 feet and <br /> extends downward to the water table, generally at a depth of 15 feet below the <br /> surface. <br /> Three groundwater monitoring wells were installed during this investigation <br /> near the margins of the zone of contamination. Water samples collected from <br /> the two groundwater monitoring wells (MW-1 and MW-3) contained detect- <br /> able levels of aromatic hydrocarbon compounds. <br /> Although the areal and vertical extent of the soil contamination has been <br /> determined, the areal extent of groundwater contamination has not been <br /> completely defined. <br /> Project Number: JOAQ22192 Page 1 of 11 <br />