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Additional Site Assessment Work Plan VAN BUSKIRK GOLF COURSE FACILITY 1740 Houston Avenue, Stockton, California 1.0. INTRODUCTION At the request of the City of Stockton,Advanced GeoEnvironmental, Inc. (AGE) has prepared the enclosed additional site assessment work plan for Van Buskirk Golf Course maintenance facility (site) located at 1740 Houston Avenue, Stockton, California(Figure 1). The work plan includes the advancement of two paired, cone penetrometer testing (CPT) soil borings for the collection of ground water samples and to characterize lithology,model potential contaminant migration pathways and to assess the vertical extent of MTBE-impacted ground water. The location of the site is illustrated on Figure 1. A plan of the site is illustrated on Figure 2. This work plan was prepared at the request of the San Joaquin County Environmental Health Department (EHD), by letter dated IS May 2003 (Appendix A), to assess the vertical and lateral extent of dissolved MTBE north of the USTs, near wells MW-4 and MW-6 and at monitoring well MW-10 (Figure 2). The work plan was prepared in accordance with California Regional Water Quality Control Board - Central Valley Region (CVRWQCB) guidelines for the investigation of underground storage tank(UST)sites.Site background information and historical ground water data are included in Appendix B and Tables 1 and 2, respectively. 2.0. SCOPE OF WORK To assess the vertical and lateral extent of MTBE-impacted ground water on the site, completion of the following tasks is required: • Permitting and pre-field work activities; • CPT drilling and sample collection; • Laboratory analysis of samples • Preparation of a report of findings. 2.1. PERMITTING AND PRE-FIELD WORK ACTIVITIES A site assessment boring permit will be obtained from the EHD for boring locations and encroachment permits will be obtained from the City of Stockton Public Work Department, if necessary. An update to the health and safety plan presently on-file will be prepared in accordance with Occupational Safety and Health Guidance Manual for Hazardous Waste Site Activities (National Institute for Occupational Safety and Health Administration, U.S. Coast Guard and U.S. Environmental Protection Agency, 1985).Prior to mobilization,the area of excavation will be clearly marked and a utility clearance obtained through Underground Service Alert. Advanced GeoEnvironmental.Inc.