Laserfiche WebLink
1 <br /> 1117 Lone Palm Avenue, Suite 201 <br /> Modesto, California 95351 <br /> WF A Tkc209-579-2221 <br /> ENVIRONMENTAL • GEOTECHNICAL Fax: 209-579-2225 <br /> BUILDING SCIENCES • MATERIALS TESTING <br /> July 30, 2020 <br /> Z054000014 <br /> Ms. Vera Fischer <br /> Central Valley Regional Water Quality Control Board <br /> 11020 Sun Valley Drive, Suite 200 <br /> Rancho Cordova, California 95370 <br /> Subject: Off-site Groundwater Investigation Workplan, Former Stockton City Taxi Cab <br /> Company, 2085 East Fremont Street, Stockton, California <br /> Dear Ms. Fischer: <br /> ATC Group Services LLC has prepared this workplan on behalf of the Ernest R. Foppiano Family Trust <br /> describing proposed subsurface investigation activities to be conducted in association with the above <br /> referenced site (Figures 1 and 2). The purpose of the subsurface investigation is to evaluate the <br /> horizontal extent of petroleum impacted groundwater off site to the east. The scope of work is described <br /> in detail in the following paragraphs. <br /> The scope of work includes advancing two off-site soil borings, collecting groundwater samples, and <br /> preparing a report describing the investigation activities and making recommendations for additional <br /> site activities, if warranted. The scope of work is described in detail in the following paragraphs. <br /> SITE HISTORY <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 tank <br /> pit and under product piping and analyzed for petroleum hydrocarbons. Analytical testing indicated the <br /> samples collected from the tank pit contained detectable concentrations of petroleum hydrocarbon <br /> constituents. <br /> In February 2000, WHF, Inc. (WHF) advanced two soil borings, B 1 and B2, to depths of approximately <br /> 81.5 and 31.5 feet below ground surface (bgs), respectively. Soil and groundwater samples were <br /> collected from the borings and submitted for laboratory analyses. These soil and groundwater samples <br /> contained detectable concentrations of petroleum hydrocarbon constituents. <br /> In July 2003, WIC 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 MW 1 through MW4. <br /> From November 10 to November 12, 2004 and November 15 to November 17, 2004, an ATC <br /> Associates Inc. (ATC) geologist supervised the installation of monitoring wells MW5 through MW 12. <br /> Soil samples were collected from the boreholes of MW5, MW6, MW7, MW8, MW9, MW 10, MW 11, <br /> s:\enviromental\28349\reports\2020 Offsite WP CPT.doc 1 ATC <br />