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P.O. Box 576981-6981 <br /> M.J. Kloberdanz bC Associates %-4dodesto, California 95357 <br /> Environmental Assessment Phone: (209) 577-8186 <br /> Fax: (209) 577-8158 <br /> July 26, 2001 <br /> Mr. Jeff Wong, REHS F� <br /> San Joaquin County <br /> Environmental Health Division G-D <br /> P.O. Box 2009 V__4 <br /> r..3 <br /> Stockton, California 95201 <br /> RE: �• <br /> Work Plan <br /> Subsurface Soil and Groundwater Investigation <br /> Agricultural Shop Building, Manteca Unified School District <br /> 2901 E. Louise Avenue, Manteca, California <br /> M.J. Kloberdanz and Associates are pleased to submit a work plan to define the vertical <br /> and lateral extent of soil and groundwater contamination associated with a release from <br /> an underground storage tank at 2901 E. Louise Avenue, Manteca, California. The work <br /> plan has been prepared on behalf of the Manteca Unified School District in response to <br /> the February 9, 2001 directive of the San Joaquin County Environmental Health <br /> Department. <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 objective of the scope of work is to characterize the extent, <br /> magnitude, and movement of the contaminated soil and groundwater in the area of the <br /> former diesel underground tank. Three exploratory borings will be advanced to a depth of <br /> 35 feet and soil and groundwater samples will be collected for laboratory analysis. The <br /> direction and magnitude of groundwater flow will be calculated. A survey of water wells <br />