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Groundwater Monitoring Report — Second Quarter 2014 IDEALEASE - STOCKTON 1137 South Stockton Street, Stockton, California 1.0. INTRODUCTION At the request of Idealease of Stockton, Advanced GeoEnvironmental, Inc. (AGE) has prepared this quarterly report for 1137 South Stockton Street, Stockton, California (the site). The scope of work included groundwater monitoring and sampling of wells MW-1 through MW-4 in April 2014, submission of monitoring and analytical data to the Water Resources Control Board's GeoTracker information management system and preparation of this report. The site and the surrounding area are illustrated in Figure 1. Structure, boring and well locations are illustrated in Figure 2. Background information is included in Appendix A. 2.0. PROCEDURES On 15 April 2014, a groundwater monitoring event was conducted at the site. Depth to groundwater measurements and groundwater samples were collected from monitoring wells MW-1 through MW-4. The wells were sampled in accordance with AGE's standard monitoring and sampling procedures, described in Appendix B. Field data and logs are provided in Appendix C. Groundwater monitoring well construction details are summarized in Table 1. 3.0. FINDINGS The groundwater elevation, flow direction, and gradient were determined from field data collected on 15 April 2014; the contaminant impact to groundwater was quantified by the laboratory analytical data. • At the time of the April 2014 monitoring event, depths to groundwater ranged from 13.37 feet (MW-1) to 14.92 feet (MW-3) below the tops of the well casings (btoc). Groundwater elevation at the site ranged from 5.18 feet (MW-3) to 5.33 feet (MW-4) below North American Vertical Datum (NAVD88) and averaged approximately 5.23 feet below NAVD88. Depth to groundwater and groundwater elevation data is included in Table 2. • Groundwater flow direction was determined from groundwater elevation data collected from wells MW-1 through MW-4. Groundwater was inferred to be flowing radially towards a groundwater depression centered at well MW-4, at hydraulic gradients of 0.002 foot per foot (ft/ft) and 0.003 ft/ft. Figure 3 illustrates the contoured groundwater elevations as measured on 15 April 2014. Advanced GeoEnvironmental Inc.