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WORK PLAN FOR GAS PROBE INSTALLATION <br /> FRENCH CAMP LANDFILL <br /> SAN JOAQUIN COUNTY, CALIFORNIA <br /> 1.0 INTRODUCTION <br /> This work plan is for the installation of eight gas probes at the <br /> Austin Road Landfill, San Joaquin County, California. Preparation <br /> of this work plan was authorized by the City of Stockton. <br /> This work plan was prepared by the Environmental Services Division <br /> of The Twining Laboratories, Inc. (Twining) in Modesto, California. <br /> 2 .0 PURPOSE AND SCOPE <br /> The purpose of this project is to install eight soil gas probes to <br /> a depth of approximately 15 feet below site grade (BSG) . Twining <br /> understands that the probes are intended to be used for quarterly <br /> soil gas monitoring in compliance with Subtitle D of the Resource <br /> Conservation and Recovery Act (RCRA) . The following scope of work <br /> is proposed to achieve the above referenced objective: <br /> 0 Drill eight soil borings to 15 feet below site grade (BSG) and <br /> collect soil samples for lithology purposes; <br /> 0 Complete borings as one-inch diameter gas probes using 1/4- <br /> inch outside diameter, 3/16-inch inside diameter Teflon TM <br /> tubing for sampling; <br /> 0 Measure initial methane concentrations; and <br /> 0 Prepare a report documenting field activities with a site <br /> location map, site plan showing probe locations, final boring <br /> logs, and probe construction diagrams . <br /> 3 .0 BACKGROUND <br /> A description of the site, the geologic and hydrologic <br /> characteristics, and the project history are summarized in the <br /> following subsections. <br /> 3. 1 Site Description <br /> The French Camp Landfill (site) , a former burn dump for <br /> agricultural vegetative matter, is located south of the city of <br /> Stockton, California, west of Manthey Road and between Walker and <br /> French Camp Sloughs (Drawing 1) . <br />