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• ATC Associates Inc. <br /> TC 1117 Lone Palm Avenue, Suite B <br /> Modesto,California 95351 <br /> 209-579-2221 <br /> A s s o C i are s i N c . Fax: 209-579-2225 <br /> ATC Associates Inc. (ATC) has prepared this letter on behalf of Raymond Greer to summarize <br /> analytical data collected from the soil vapor extraction system at time of startup for the above <br /> referenced site. The analytical results support the viability of using vapor extraction as a method <br /> for remediating petroleum impacted soil and groundwater in the vicinity of the former <br /> underground storage tanks (USTs). In order to comply with Authority to Construct Permit No. <br /> N-7256-1-0, sampling was performed in the presence of a San Joaquin Valley Air Pollution <br /> Control District (SJVAPCD) regulator and results of the analytical data are summarized in the <br /> following paragraphs. <br /> Site Location <br /> The site is located on the east side of Steinegul Road and south of Lone Tree Road in Escalon, <br /> • California, as shown on Figure 1 and Figure 2. The location is a residential and agricultural area <br /> and the site is currently occupied by a single-family residence. <br /> Site Background <br /> In May 1987, one 550-gallon gasoline underground storage tank (UST) and one 1,000-gallon <br /> gasoline UST were removed from the site by H&H Ship Service. The USTs were transported <br /> and disposed of at the Levin Metal Corporation disposal site in Richmond, California. A soil <br /> sample collected from beneath the 1,000-gallon UST contained detectable concentrations of <br /> benzene, toluene, ethyl benzene, and xylenes (BTEX) constituents. <br /> In March 1997, WHF, Inc., (WHF) supervised the advancement of one soil boring to 80 feet <br /> below ground surface (bgs). Soil and groundwater samples collected from the soil boring <br /> contained detectable concentrations of total petroleum hydrocarbons as gasoline (TPHg) and <br /> BTEX. A water sample was also collected from the on-site drinking water and it contained no <br /> detectable concentrations of petroleum hydrocarbons. <br /> In December 1998, BSK & Associates (BSK) advanced five borings at the site and completed <br /> four of the borings as groundwater monitoring wells MWl through MW4. Soil samples <br /> collected from borings B2 and MW2 contained detectable concentrations of TPHg and BTEX. <br /> Soil samples collected from soil boring B2 contained detectable concentrations of methyl tertiary <br /> • butyl ether(MTBE). <br /> S:\Enviromental\25291\repom\ctartup.doc 2 <br />