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Wright <br /> Environmental <br /> Services, Inc. <br /> 2395 East Pescadero Avenue <br /> TracCA 95304 <br /> April 2009 • . :"\Vjrc, L� <br /> Project No. 4509-T <br /> . APR 0 2 2009 <br /> City of Tracy ENVIRON,1EN( 'HEALTH <br /> 325 Civic Center Plaza PERN1iT./SERVICES <br /> Tracy, California 95376 <br /> Attn.: Mr. Paul Verma <br /> Re: Limited Phase H Site Investigation <br /> Groundwater Monitoring Well Installation and Sampling Report <br /> Delta Disposal, 99 Sixth Street, Tracy, CA PHS EHD Site Code#2183 <br /> Dear Mr. Verma, <br /> Wright Environmental Services, Inc. (Wright) has prepared this Limited Phase II Site <br /> Investigation Groundwater Monitoring Well Installation and Sampling Report on behalf of City <br /> of Tracy (property owner) for the public right of way South of the above referenced site. This <br /> work is in response to letter dated October 17, 2007 from the San Joaquin County, <br /> Environmental Health Division (SJC/EHD) for additional site assessment. The City and <br /> SJC/EHD held a meeting regarding the next step in the assessment process as discussed in the <br /> Wright workplan dated December 10, 2007 that had been prepared for the groundwater <br /> monitoring well installation and initial monitoring well sampling for the site. <br /> 1.0 Background <br /> Two underground fuel storage tanks were removed in 1985 from a locatioZ-glallon <br /> later became a <br /> portion of Sixth Street. The two tanks (one 350-gallon diesel and one gasoline) <br /> locations were excavated in May 1990 and soil samples collected at the west end of the <br /> excavation at that time showed 18,000 parts per million (ppm) of Total Petroleum Hydrocarbons <br /> as Diesel (TPHD). As a result of that information, SJC/EHD requested additional site <br /> assessment. Three exploratory borings were drilled and sampled by Wright around the former <br /> underground tank pits in Sixth Street in February 2003. Soil boring samples collected in <br /> February 2003 showed that contaminants contained TPHG and TPHD in soil samples near the <br /> capillary fringe, with the highest values in B-2. Groundwater samples from the borings showed <br /> TPHG and TPHD in Borings B-2 and B-3. These samples together with the inferred northerly <br /> Page 1 of 11 <br />