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Manteca Unified School District <br /> ' Agricultural Shop Building <br /> 2901 E. Louise Avenue, Manteca, California <br /> ' Soil and Groundwater Investigation Report <br /> g P <br /> ' 1 0 PROJECT IDENTIFICATION <br /> ' San Joaquin County Environmental Health Department (SJCEHD), in a February 9, 2001 <br /> letter, required an additional investigation to define the extent of contaminants disclosed <br /> in a March 1997 tank removal and confirmed in a 1998 study by others (Kleinfelder, <br /> November 1998) at the Manteca Unified School District Agriculture facility SJCEHD <br /> directed that a work plan to define the vertical and horizontal extent of the soil and <br /> ' groundwater contamination be prepared and submitted for review and approval . <br /> SJCEHD noted that a known domestic drinking water well is located to the south of the <br /> former underground storage tank location SJCEHD also indicated that 2000-foot radius <br /> survey of water wells and an estimate of the mass of the contamination in soil and <br /> groundwater will required before the site can be considered for closure <br /> In a February 2001 meeting, SJCEHD staff proposed the installation of three <br /> groundwater-monitoring wells as an appropriate scope of work for the required site <br /> investigation The objectives of the scope of work were the characterization of the <br /> ' extent, magnitude, and movement of the contaminated soil and groundwater in the area of <br /> the former diesel underground tank Three exploratory borings were advanced to a depth <br /> of 30 feet and soil and groundwater samples were collected for laboratory analysis The <br /> ' direction and magnitude of groundwater flow were calculated and a survey of water wells <br /> located within a 2000-foot radius conducted and well details, as available, obtained <br /> ' 1 1 Site Description and History <br /> ' Previous studies (Kleinfelder, November 1998) report that on March 18, 1997 a <br /> 250-gallon underground storage tank (UST) was removed from an area adjacent <br /> to a Manteca Unified School District, Agricultural Shop Building Reportedly, <br /> ' eight yards of soil were excavated from the tank cavity and stockpiled onsite Two <br /> soil samples were collected by GeoAnalytical Laboratories of Modesto, California <br /> and analyzed for Benzene, Toluene, Ethyl-benzene and Xylenes (BTEX), and <br /> ' Total Petroleum Hydrocarbons - Diesel (TPH-D) The soil samples were collected <br /> . from the stockpiled soil (SP) and from the bottom of the excavation at a depth of <br /> approximately 7 feet below surface grade (bgs) BTEX constituents were not <br /> 1 <br />