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L= E�G (E� I�iIsDD <br /> TC 1117 Lone Palm Avenue, Suite n <br /> O C I _ Modesto, CA 95351 <br /> 3 2007 www.atcassociates.com <br /> 209-579-2221 <br /> A S S O C I A T E S I N C . f, 209-579-2221 <br /> HEALTH Fax 209-579-2225 <br /> Environmental, Geotechnical and Materials Engineers <br /> ~F1 ' �I ' � 1dRVI�E$ 1 , <br /> October 2, 2007 <br /> 54.28349.0001 <br /> Ms. Lori Duncan <br /> San Joaquin County <br /> Environmental Health Department <br /> 600 East Main Street <br /> Stockton, California 95202 <br /> r <br /> Subject: Subsurface Investigation Workplan, Former Stockton City Taxi Cab Company, 2085 <br /> East Fremont Street, Stockton, California <br /> Dear Ms. Duncan : <br /> ATC Associates Inc . (ATC) has prepared this workplan, on behalf of Mr. Ernest Foppiano, describing <br /> proposed subsurface investigation activities to be conducted in association with the above referenced <br /> site (Figures I and 2) . The purpose of the subsurface investigation is to evaluate the horizontal and <br /> vertical extent of petroleum impacted groundwater off-site to the southeast. This workplan was <br /> prepared in response to your correspondence dated July 23 , 2007. <br /> The scope of work includes installing four off-site monitoring wells and preparing a report describing <br /> the investigation activities and making recommendations for additional site activities, if warranted. <br /> The scope of work is described in detail in the following paragraphs. <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, B1 and 132, 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 I <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 MW 1 through MW4. <br /> 5:\Enviro=ental\28349\wkp.doe 1 ATC Associates Inc. <br />