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Annual Ground Water Monitoring Report - Third Quarter 2009 ERNIE'S GENERAL STORE 4407 East Waterloo Road, Stockton, California 1.0. INTRODUCTION At the request of Mr. Ernest P. Giannecchini,Advanced GeoEnviromnental, Inc. (AGE) prepared this annual report for the property located at 4407 East Waterloo Road, Stockton, California. The scope of work included performance of the annual ground water monitoring event and preparation of this report. The site and the surrounding area are illustrated in Figure 1. On-site structures and monitoring well locations are illustrated in Figure 2. Site background information is summarized in Appendix A,which includes historical soil analytical tables. Field work was performed in accordance with guidelines established by the California Regional Water Quality Control Board - Central Valley Region (Regional Board) for the investigation of underground storage tank(UST)sites and the San Joaquin County Environmental Health Department (SJCEHD) for the sampling of ground water monitoring wells. Note that previous reports have referred to the construction of wells MW-1 through MW-4 as screened from 60 feet below surface grade (bsg) to 80 feet bsg; however, the actual depth of well MW-1 through MW-4 is 85 feet bsg with a screen interval of 65 feet bsg to 85 feet bsg. Well construction details are summarized in Table 1. 2.0. PROCEDURES On 29 September 2009,the annual groundwater monitoring event was conducted utilizing site wells MW-1 through MW-5; wells MW-1 through MW-4 were sampled. Well MW-5 did not contain sufficient water to collect a ground water sample. Monitoring was performed in accordance with AGE's standard monitoring and sampling procedures,provided in Appendix B. No exceptions to AGE's standard procedures were noted. Field data and logs are provided in Appendix C. 3.0. FINDINGS Groundwater elevation,flow direction and gradient were determined from field data collected on29 September 2009.Contaminant-impact to ground water was quantified by laboratory analytical data. At the time of the September 2009 sampling event: • Depths to ground water ranged between 76.32 feet (MW-3) below the tops of the well casings (btoc) and 76.65 feet (MW-4) btoc (Table 2). Ground water elevations at the site ranged between 43.25 feet(MW-2)below North American Vertical Datum(NAVD88)and 43.73 feet(off-site well MW-5)below NAVD. Advanced GcoEnvironmental,Inc.