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Wright <br /> s t Environmental <br /> Services Inc. <br /> 2395 East Pescadero Avenue <br /> Tracy,CA 95304 <br /> December 10, 2007 <br /> Project No. 4889 <br /> City of Tracy <br /> 3900 Holly Drive <br /> Tracy, California 95376 <br /> Attn.: Mr. Paul Verma <br /> Re: Limited Phase II Investigation <br /> Additional Soil and Groundwater Site Workplan <br /> City of Tracy Wastewater Plant,3900 Holly Drive, Tracy, CA <br /> PHS EHD Site Code#2330 <br /> Dear Mr. Verma, <br /> Wright Environmental Services, Inc. (Wright) has prepared this report on behalf of City of Tracy <br /> (property owner) for the above referenced site. This work is in response to letter dated October <br /> 17, 2007 from the San Joaquin Public Health Services Environmental Health Division <br /> (SJC/EHD) for additional site assessment. The purpose of the work is to address contaminants <br /> from an underground diesel fuel storage tank on the site and to further define the vertical and <br /> horizontal extent of the Diesel fuel dissolved plume. <br /> 1.0 Background <br /> One underground storage tank containing diesel fuel for a backup generator at the Treatment <br /> Plant was removed from the site in January 1998 under SJC/EHD permits. One surface diesel <br /> storage tank is located adjacent to the former tank pit. Soil and groundwater samples collected as <br /> a part of the tank removal revealed Total Petroleum Hydrocarbons as Diesel (TPHD) in soil at 11 <br /> milligrams per kilogram (mg/kg) and 580 milligrams per liter (mg/1) in groundwater. On the <br /> basis of this data, SJC/EHD requested additional site investigation. The former tank pit is located <br /> within the Wastewater Plant operation between several large treatment ponds. Tank removal data <br /> from 1998 showed low levels of TPHD in soil and groundwater samples. <br /> Page 1 of 4 <br /> i <br />