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' � 1 I Quarterly Report - Fourth Quarter2008 FIVE STAR MARINA (WEST) ' 345 Yosemite Street, Stockton, California I 1.0. INTRODUCTION At the request of Mr. Terry McDonald of Five Star Marina, Advanced GeoEnvironmental, Inc. (AGE)has prepared this quarterly report for the property located at 345 Yosemite Street, Stockton, California(site). The scope of work included performance of a quarterly ground water monitoring event and preparation of this report. The location of the site and the-surrounding area is illustrated on Figure 1; structures, former underground storage tank (UST).locations, and soil boring and monitoring well locations are illustrated on Figure 2. I j In accordance with the San Joaquin County Environmental HealthDepartment (SJCEHD) email directive, dated August 2008, the former Five Star Marina project,was divided into two project investigations to individually assess the eastern and western unauthorized tank releases located at the site. sk Site history and findings from previous investigations andilmonitoring events are provided in Appendix A. Results of previous ground water monitoring events are included in the tables of this report. Ground water monitoring was performed in accordance with Appendix A -Reports, Tri-Regional Board Staff Recommendations for Preliminary Investigation and Evaluation of Underground Storage Tanks,dated 16 April 2004,prepared by the Central Valley Regional Water Quality Control { Board. 2.0. PROCEDURES On 10 October 2008,the quarterly ground water monitoring event was conducted utilizing site wells MW-I through MW-4; monitoring was performed in accordance with AGE's standard monitoring and sampling procedures,provided in Appendix B. Field data and logs are provided in Appendix C. No exceptions to AGE's standard procedures were noted. 3.0. FINDINGS i Ground water elevation, flow direction, and gradient were determined from field data collected on 10 October 2008; contaminant impact to ground water was quantified by the laboratory analytical data. Findings are as follows: • Depths to ground water ranged from 8.34 feet (MW-2) below the tops of the well casings (btoc) to 9.23 feet(MW-3)btoc (Table 1). Ground water elevations at the site ranged from Advanced GeoEnvironmental,Inc.