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Additional Site Assessment Work Plan - Revised August 2003 HERMAN & HELEN'S MARINA 15135 Eight Mile Road, Stockton, California 1.0. INTRODUCTION At the request of Mr. Andrew Smith of Herman &Helen's Marina,Advanced GeoEnvironmental, Inc. (AGE) has prepared this revised work plan for 15135 Eight Mile Road, Stockton, California. The original AGE-prepared Additional Site Assessment Work Plan was prepared in response to the Central Valley Regional Water Quality Control Board's (CVRWQCB) directive, in a letter dated 21 April 2003,to continue the delineation of the lateral and vertical extent of hydrocarbon-impacted soil and groundwater and to determine the source of elevated concentrations of petroleum hydrocarbons in soil and groundwater near MW-6; this revised work plan includes concerns expressed by the C VRWQCB to the original work plan,in a letter dated 16 July 2003(Appendix A). The site and the surrounding area are illustrated in Figure 1. Structures and monitoring well and sampling locations are illustrated on Figure 2.This work plan provides a description of the scope of work and procedures for the advancement of soil probe borings st the site. 2.0. BACKGROUND Site background information is provided in Appendix B.Additional information can be found in the AGE-prepared documents Additional Soil and Ground Water Investigation Report dated 11 April 2003 and Quarterly Report-First Quarter 2003 dated 29 April 2003. 3.0. SCOPE OF WORK AGE proposes to advance four soil probe borings in the area of monitoring well MW-6 and the northern portion of the site to assess impacted soil and ground water. The assessment activities will consist of the following tasks: • Permitting and pre-field work preparations; • Probe boring advancement and sample collection; • Report preparation. Advanced GmEnvironmental,Inc.