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f <br /> I <br /> © Wright <br /> ECENED � Environmental <br /> DEC <br /> 1 0 2007 <br /> ENVIRONMENT HEALTH Services, Inc. <br /> KHMTT/SE"`E J 2395 East Pescadero Avenue <br /> Tracy,CA 95304 <br /> December 10, 2007 <br /> Project No. 4529 <br /> City of Tracy <br /> 560 Tracy Boulevard <br /> Tracy, CA 95376 <br /> Attn.: Mr. Paul Verma <br /> Re: Limited Phase I1 Site lwvestiga ien,WQfWfX_AfJ <br /> Soil and Groundwater Assessment Boyd Service Center, Bldg. C <br /> Wright Project No. 4529-D PHS EHD Site Code 1421 <br /> Dear Mr. Verma <br /> Wright Environmental Services, Inc. (Wright) is pleased to provide you with this workplan for <br /> the Limited Phase I Site Investigation at the above referenced site (city corporation yard) located <br /> at 520 Tracy Boulevard, Tracy, California (see Figure 1). The purpose of this work is to <br /> ascertain the depth to groundwater, identify suspected petroleum contaminants in soil and <br /> groundwater and install monitoring wells around the former tank area as required by the San <br /> Joaquin County Public Health Services Environmental Health Division (PHS EHD) in their <br /> letters dated January 25, 1999 and October 17, 2007. <br /> 1.0 Background <br /> The Boyd Service Center corporation yard is adjacent to an area formerly used by the railroad for <br /> bulk locomotive fuel storage. Aerial photographs show that large surface tanks stored fuel for <br /> decades and leakage has occurred. Prior to acquiring the property for the corporation yard, the <br /> property shared a common boundary to this railroad fuel storage area and automotive fuels also <br /> may have been stored in this area. Sampling for the presence of contamination has not been <br /> performed in this immediate vicinity however, other areas of former bulk railroad fuel storage <br /> areas in Tracy has revealed contaminated soil and groundwater. The Service Center used three <br /> underground fuel storage tanks on-site (Tank #1 5,000 diesel; Tank #2 8,000 gallon gasoline; <br /> Tank #3 8,000 gallon gasoline) until their removal from the site on December 22, 1998 (see <br /> Figures 1, 2 and 3). Soil excavated from the tank pit was stockpiled on-site and soil samples <br /> were collected from beneath the tanks (two samples each at 15 feet) and dispensers (one sample <br /> Page 1 of 6 <br /> t <br />