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k Wright <br /> Environmental <br /> Services, Inc. <br /> 2395 East Pescadero Avenue <br /> Tracy,CA 95304 <br /> February 16, 2010 <br /> Project No. 4889 <br /> City of Tracy <br /> 520 Tracy Boulevard <br /> Tracy,California 95376 <br /> Attn.: Mr. Paul Verma <br /> Re: Groundwater Monitoring Well Installation and Initial Groundwater Sampling and <br /> Chemical Analysis, Yd Quarter 2009 City of Tracy Wastewater Treatment Plant, <br /> 3900 Holly Drive,Tracy,CA: PHS EHD Site Code#2330 <br /> Dear Mr. Verma, <br /> Wright Environmental Services, Inc. (Wright) has prepared this Groundwater Monitoring Well <br /> Installation and Initial Sampling and Chemical Analysis, 3d Quarter 2009 Report on behalf of <br /> City of Tracy (property owner) for the above referenced site. This work is in response to letters <br /> dated October 17, 2007 and February 24, 2009 from the San Joaquin Public Health Services <br /> Environmental Health Division (SJC/EHD) for additional site assessment. The purpose of the <br /> work is to address contaminants from an underground diesel fuel storage tank at the Wastewater <br /> Treatment(WWTP)on the site to 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 SJC/EHD permits. One (1) 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 WWTP operation between several large treatment ponds. Tank removal data from <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 the WWTP. The soil samples collected showed that <br /> contaminants were not detected. Groundwater samples showed very low levels of dissolved <br /> Page I of 9 <br />