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Wright <br /> Erlviro mental <br /> Services, Inc. <br /> 2395 East Pescadero.Avenue <br /> Tracy,CA 95304 <br /> January 14, 2009 <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 I Investigation <br /> Additional Soil and Groundwater Site Assessment <br /> City of Tracy Wastewater Treatment 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 County .Environmental Health Division(SJC/EHD) for additional <br /> site assessment. The purpose of the work is toaddress contaminants from a former underground <br /> diesel fuel storage tank on.the site and to further define the vertical and horizontal extent of the <br /> Diesel. fuel. dissolved plume initially mapped in 2003. Five additional borings were placed on- <br /> site to further define the dissolved contaminant plume as discussed in WES workplan dated <br /> December 10, 2007. <br /> 1.0 Background <br /> One underground storage tank containing diesel. fuel for a backup generator at the Wastewater <br /> Treatment Plant (WWTP) was removed from the site in January 1998 under SJC/EHD permits. <br /> Soil and groundwater samples collected as a part of the tank removal revealed Total Petroleum <br /> Hydrocarbons as Diesel (TPHD) in soil at 1.1. milligrams per kilogram (mg/kg) and 580 <br /> milligrams per liter (mg/1) in groundwater. On the basis of this data, SJC/.EHD requested <br /> additional site investigation. The former tank pit is located within the WWTP operation between <br /> several large ponds to the North and recently constructed treatment structures to the South that <br /> have altered the area. <br /> Page 1 of 9 <br />