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Y Q.) ` <br /> Wright <br /> Environmental <br /> 7 Services, Inc. <br /> :a . <br /> 2395 East Pescadero Avenue <br /> v Tracy,CA 95304 <br /> September 17, 2010 ` <br /> Project No. 4889 - <br /> City of Tracy cap ' <br /> 520 Tracy Boulevard <br /> Tracy, California 95376 <br /> vtn <br /> Attn.: Mr. Paul Ver-na <br /> Re: Groundwater Monitoring Well Sampling and Chemical Analysis, 3rd Quarter 2010 <br /> City of Tracy Wastewater Treatment Plant, 3900 Holly Drive, Tracy, CA: EHD Site <br /> Code#2330 <br /> Dear Mr. Verma, <br /> Wright Environmental Services, Inc. (Wright) has prepared this Groundwater Monitoring Well <br /> Sampling and Chemical Analysis, 3`d Quarter 2010, Report on behalf of City of Tracy (property !, <br /> owner) for the above referenced site. This work is in response to letters dated October 17� 2007 <br /> and February 24, 2009 from the San Joaquin County Environmental Health Division (EHD) for <br /> additional site assessment. The purpose of the work is to address contaminants from an <br /> underground diesel fuel storage tank at the ,;Wastewater Treatment (WWTP) on the site to <br /> monitor the Diesel fuel dissolved plume (see References). - - <br /> 1.0 Background <br /> One (1) underground storage tank containing diesel fuel for a backup generator at the WWTP <br /> was removed from the site in January 1998 under EHD permits. One (1) surface diesel storage <br /> tank is located adjacent to the former tank pit. Soil and groundwater samples collected as a part <br /> of the tank removal revealed Total Petroleum Hydrocarbons .as Diesel (TPHD) in soil at I1 <br /> milligrams per kilogram (mg/kg) and 580 milligrams per liter (mg/1) in groundwater. On the <br /> basis of this data, EHD requested additional site investigation. The former tank pit is located <br /> within the WWTP operation between several large treatment ponds. Tank removal data froi <br /> 1998 showed low levels of TPHD in soil and groundwater samples. ` <br /> Four (4) exploratory borings (B-1, B-2, B-3 and B-4) were drilled and sampled in April 2003 <br /> around the former underground tank pit at theWWTP. The soil samples collected showed that <br /> contaminants were not detected. Groundwater samples showed very low levels of dissolved <br /> Page 1 of 7 <br />