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Interim Remediation Work Plan - September 2003 HERMAN AND HELEN'S MARINA 15135 Eight Mile Road, Stockton, California 1.0. INTRODUCTION At the request of Andrew Smith of Herman and Helen's Marina,Advanced GeoEnvironmental,Inc. (AGE)has prepared this work plan for interim ground water remediation at 15135 Eight Mile Road, Stockton,California.The scope ofwork includes installation of an interim ground water`pump-and- treat' remediation system at the site. The location of the site is illustrated on Figure 1. A plan of the site is illustrated on Figure 2. In a letter dated 11 August 2003,the California Regional Water Quality Control Board(CRWQCB), requested the preparation of a work plan for installation of interim ground water remediation utilizing a`pump-and-treat'technology in the area of the highest methyl tertiary butyl ether(MTBE) contamination. The purpose of this work plan is to detail the design, installation and operation of a ground water `pump-and-treat' system utilizing granulated activated charcoal (GAC) and MTBE- hydroscopic synthesized filter media(Sunsolve©). 2.0. BACKGROUND The site is located immediately south of the Little Connection slough, San Joaquin County, California,at the end of Eight Mile Road and it is presently occupied by Herman and Helens Marina, a marina and boat fueling station. Improvements to the property include a floating office and mooring docks, a ramp from the levee to the docks, large asphalt parking lot and two above ground storage tanks (AST). Additional site background information can be found in Appendix A. 3.0. SCOPE OF WORK Based on the ground water aquifer pumping test results found in the AGE-prepared Ground Water Extraction Feasibility Test Report dated 24 July 2003,AGE proposes to install,operate and maintain an interim ground water pump-and-treat remediation system utilizing existing ground water extraction well EW-1. Interim remediation field activities will consist of the following tasks: • Permitting and pre-field work activities; • Installation of underground remediation piping system; • Installation of ground water pump-and-treat system; • Interim remediation start-up period; Advanced GwEnvironmental,Inc.