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.--- � P.O. Box 576981-6981 <br /> - ` ``�M.J. Kloberdanz <br /> Associates "Modesto, California 95357 <br /> a, Environmental Assessment Phone: (209) 577-8186 <br /> Fax: (209) 5T;-8158 <br /> 1 <br /> July 26, 2001,, <br /> Jeff Wong, RENS <br /> San Joaquin County f <br /> Environmental Health Division <br /> t <br /> P.O. Box 2009 <br /> Stockton, California 95201 j <br /> I <br /> RE: <br /> Work Plan ! <br /> Subsurface Soil and Groundwater Investigation <br /> Manteca Unified School District, 660 Mikesell Avenue <br /> Manteca, California <br /> I <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 /> two underground storage tanks at 660 Mikesell Avenue, Manteca, California. The work <br /> plan has been prepared on behalf of the Manteca Unified School District in response to j <br /> the February 9, 2001 directive of the San Joaquin County Environmental Health <br /> Department. <br /> i <br /> i <br /> 1.0 PROJECT IDENTIFICATION <br /> San Joaquin County Environmental Health Department (SJCEHD), in-a February 9, 2001 1 <br /> letter, required an additional investigation to define the extent of contaminants disclosed <br /> in a November 1998 tank removal and confirmed by M.J. Kloberdanz and Associates in <br /> our December 2000 findings at the Manteca Unified School District Grounds Shop <br /> facility. SJCEHD directed that a work plan to define the vertical and horizontal extent of <br /> the`soil and groundwater contamination be prepared and submitted for review and <br /> approval. SJCEHD noted that a 2000-foot radius survey of water wells and an estimate <br /> of the mass of the contamination in soil and groundwater will required before the site can <br /> be considered for closure. <br /> In a February 2001 meeting, SJCEHD staff proposed the use of a Geoprobe for soil <br /> borings in lieu of monitoring well installation. The objective of this scope of work will . <br /> be to characterize the contaminated soil and groundwater in the area of the by obtaining <br /> soil and groundwater samples for analysis. The objective of the scope of work is to <br /> characterize the extent, magnitude, and movement of the contaminated soil and <br /> groundwater in the area of the former diesel dispenser and diesel underground storage <br /> tank. Three exploratory borings will be advanced to a depth of 35 to740 feet and soil and <br /> groundwater samples be collected for laboratory analysis. The direction and magnitude of <br /> 'I <br />