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I <br /> i <br /> i <br /> W * <br /> Wright <br /> Environmental <br /> Services, Inc. <br /> 2395 East Pescadero A-.,--nue <br /> Tracy, CA 95304 <br /> May 5,2009 <br /> Project No. 4889 <br /> City of Tracy <br /> 325 Civic Center Drive <br /> Tracy, California 95376 <br /> Attn.: Mr. Paul Venna <br /> Ile: Groundwater Monitoring Well Installation and Sampling Workplan <br /> City of Tracy,Waste Water Control Facility,3900'Ilolly Drive,'Tracy,CA <br /> PHS EH.D Site Code#2330 <br /> Dear Mr. Venn a, <br /> Wright Environmental Services, Inc. (Wright)has prepared this report on behalf of City of Tracy <br /> (City) for the above referenced site. This work is in response to a directive dated February 24, <br /> 2009, from the San Joaquin County, .Environmental .Health Division (SJC/EHD) for installing <br /> groundwater monitoring wells. The purpose of the work is to address contaminants from an <br /> underground diesel fuel storage tank on the site and to further define the vertical and horizontal <br /> extent of the Diesel fuel dissolved plume. Wright has completed an assessment of the area <br /> presented in our report dated January 1.4,2009. <br /> 1.0 Background and Previous Site Assessment Summary <br /> One underground storage tank containing diesel fuel for a backup generator at the Waste Water <br /> Control Facility (WWC.F)was removed from the site in January 1.998 under SJC/EHD pen-nits. <br /> One above ground tank containing diesel is located on the north side of the generator building <br /> 50-feet from the former tank pit. Soil and groundwater samples collected as a part of the tank <br /> removal revealed Total Petroleum Hydrocarbons as Diesel (TPHD) in soil at 11 milligrams per <br /> kilogram (mg/kg) and 580 rni.11igrams per liter(mg/1) in groundwater. On the basis of this data, <br /> SJC/EH.D requested additional site investigation. The former tank pit is located within the <br /> W WCF between several large treatment ponds. Tank.removal data from 1.998 showed low levels <br /> of TPHD in soil and groundwater samples. <br /> i <br /> Page 1 of 5 <br /> i <br /> i <br /> I <br />