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Semi-Annual Groundwater Monitoring Report - Third Quarter 2013 STALLWORTH AUTO SALES 602 North California Street, Stockton, California 1.0. INTRODUCTION At the request of Mr. Gary Stallworth, Advanced Geo Environmental, Inc. (AGE) has prepared this groundwater monitoring report for the property located at 602 North California Street, Stockton, California (site). The scope of work included the performance of a groundwater monitoring event in Sj temb_Q[2Q1 and preparation of this report. The site and 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. Field work was performed in accordance with guidelines established by the Central Valley Regional Water Quality Control Board for the investigation of underground storage tank (UST) sites and the San Joaquin County Environmental Health Department (EHD) for the sampling of groundwater monitoring wells. 2.0. PROCEDURES n 23 September 2013, a semi-annual groundwater monitoring event was performed on all of the site wells, with the ex tp ion of well MW__1D; monitoring well MW-10 was not � .`0 'accessible for the monit5ring even. Gro dwater am es were collected or laboratory analyses from wells MW-1A, MW'1C, M�6, MW-7, MW/-,9,and M��„Monitoring and sampling was performed in accordance with AGE's standard monitoring sampling procedures (Appendix'8). Field data and logs are provided in Appendix C. new - S 3.0. FINDINGS " w 9 Ori-g 1 V r w - I'VI Groundwater elevation, flow direction, and gradient were determined from field data collected on 23 September 2013; contaminant impact to groundwater was quantified by laboratory analytical data. At the time of the 23 September 2013 sampling event: Water Table Zone: 20 to 50 feet below surface grade (bsg) • Depths to groundwater within the water table zone ranged tween 25.21 feet �tO �,5 (MW-1A) below the top of the well casing (btoc) and 26.59 feet (MW-3) bjo (Table 1). Groundwater elevations in the water table zone ranged between 11.58 feet (MW-2) below the North American Vertical Datum (NAVD88) and 11.95 feet (MW-3) below NAVD88. �� Advanced GeoEnvironmental,Inc.