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(VYATC <br /> 117 Lone Palm Avenue, Suite B <br /> Modesto, CA 95351 <br /> www.atcasso dates.co m <br /> 209-579-2221 <br /> t - <br /> AS SOCIATE s I N C . 2007 MAR 20 AM lot is Fax 209-579-2225 <br /> Li I✓ironmental, Geotechnical and Materials Engineers <br /> EFNdligo4li1- rq ALl r <br /> March 19, 2007 kts rP r} '` � 7-M&ate <br /> 54.28349.0001 <br /> Ms. Lori Duncan <br /> San Joaquin County <br /> Environmental Health Department <br /> 304 E. Weber Street, Third Floor <br /> Stockton, California 95202 <br /> Subject: Comparative Site Study, Former Stockton City Taxi Cab Company, 2085 East Fremont <br /> Street, Stockton, California <br /> Dear Ms . Duncan : <br /> - ATC Associates Inc . (ATC) has prepared this comparative site study, on behalf of Mr. and Mrs. Ernest <br /> Foppiano, to compare subsurface data associated with the subject site located at 2085 East Fremont <br /> Street, and the former Apache Plastics facility located to the south at 2050 East Fremont Street in <br /> Stockton, California. The locations of these sites are shown in Figures 1 and 2. The purpose of the <br /> study is to evaluate historical analytical data and subsurface hydrogeological characteristics of both <br /> sites to determine if selected groundwater monitoring wells at both sites can be used in concert to <br /> evaluate and monitor the extent of petroleum hydrocarbon impacted groundwater. This comparative <br /> site study was prepared in response to your correspondence dated November 28, 2005 . <br /> BACKGROUND INFORMATION <br /> In 1998, two 10,000-gallon gasoline underground storage tanks (USTs) and associated product piping <br /> were removed from the site by Advanced GeoEnvironmental . Soil samples were collected from the <br /> tank pit and under product piping and analyzed for petroleum hydrocarbons. Analytical testing <br /> indicated the samples collected from the tank pit contained detectable concentrations of petroleum <br /> hydrocarbon constituents. <br /> In February 2000, WHF, Inc. (WHF) advanced two soil borings BI and B2 to depths of <br /> approximately 81 .5 and 31 .5 feet below ground surface (bgs), respectively. Soil and groundwater <br /> samples were collected from the borings and submitted for laboratory analyses. These soil and <br /> groundwater samples contained detectable concentrations of petroleum hydrocarbon constituents. <br /> In July 2003 , WHF advanced six soil borings, four of which were completed as monitoring wells MW 1 <br /> through MW4. Soil samples collected from these borings contained detectable concentrations of <br /> petroleum hydrocarbon constituents. Petroleum hydrocarbons were detected in groundwater samples <br /> collected from MWl through MW4. <br /> S:\Environmental\28349\comparative study.doc 1 ATC Associates Inc. <br />