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Manteca Unified School District <br /> 660 Mikesell Avenue, Manteca, California <br /> Subsurface Soil and Groundwater Investigation <br /> Report II <br /> 1.0 PROJECT IDENTIFICATION <br /> MJ Kloberdanz and Associates conducted a subsurface investigation to further <br /> characterize the petroleum contamination disclosed during the underground tank removal <br /> at the above referenced property. San Joaquin County Environmental Health Department <br /> (SJCEHD), in their letter dated February 9, 2001, required an additional investigation of <br /> the contaminants disclosed in the November 1998 tank removal and MJ Kloberdanz and <br /> Associates December 2000 findings at the Manteca Unified School District's Grounds <br /> Shop facility. SJCEHD requested a scope of work that would define the vertical and <br /> horizontal extent of the soil and groundwater contamination and provide the mass of the <br /> contamination in the soil and groundwater. In addition a 2000 foot radius survey of water <br /> wells including construction details was requested. <br /> The 2000 foot radius survey for water wells was conducted in December 2006. In an <br /> April 30, 2007 letter, SJCEHD requested a modification of the 2001 work plan for three <br /> soil borings to include laboratory analyses for polynuclear aromatics (PNA's). A <br /> Geoprobe was used to obtain soil and ground water samples for the additional <br /> characterization of the lateral and vertical extent of contamination. <br /> `r 1.1 Site Description and History <br /> Two underground fuel tanks were removed under permit in November 1998 by SEMCO. <br /> Moderately high levels of diesel were present in the sample (Diesel D-2 @ 3') obtained <br /> from three feet in depth under the diesel fuel dispenser. Samples collected from the <br /> diesel and gasoline tank excavation and the gasoline dispenser were non-detect for the <br /> compounds analyzed. <br /> Table of Laboratory Sample Results (November 1998) <br /> 1� <br /> Sample I.D. Gasoline Diesel Benzene I Toluene I E-Benzene Xylenes 1 8260 Lea <br /> Gas D-1 3' ND NA ND ND ND ND ND 46 <br /> Diesel D-2@3' NA 1100 ND ND ND ND NA NA <br /> West 1 10' ND NA ND ND ND ND ND 8 <br /> West 2@9.5' NA ND ND ND ND ND NA NA <br /> SP-1 ND NA ND NDND ND ND 11 <br /> SP-2 NA I ND ND ND ND ND ND NA <br /> ND=Non Detect NA=Not Analyzed Gasoline&Lea d in in 9 BTEX&8260 inµg/Kg <br /> r.r <br />