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Subsurface Soil and Groundwater Investigation Work Plan 4900 E.Mariposa Road Stockton,California Page 2 Underground Services Alert (USA). The proposed boring locations will be marked with white paint and USA will be notified at least 48 hours in advance of the fieldwork to locate and identify underground utilities in and near the work area. Prior to initiating fieldwork at the Site,all field personnel will familiarize themselves with the Site-Specific Health and Safety Plan (HASP) and a tailgate safety meeting will be held on location prior to commencement of fieldwork. The HASP pertains to field activities and includes information on potential hazards expected to be encountered at the Site, personal protective equipment, and directions to and telephone numbers for the nearest hospital.A copy of the HASP is included in Appendix B. 4.2 SOIL SAMPLING METHODOLOGY Condor proposes drilling up to four (4) direct push borings to collect soil samples at the locations of the leach fields. Soil borings will be advanced using a Geoprobe direct push drilling company licensed by the State of California (C-57 license). Soil samples will be collected at selected intervals based on field observations. In addition, one (1) groundwater sample will be collected for laboratory analysis. Groundwater is anticipated to be encountered at approximately 50 feet bgs. Soil samples will be driven into clear acetate sleeves. The ends of selected sections of the sample sleeves will be covered with Teflon sheeting and closed with end caps for handling and transportation. Soil samples will be field screened with a photoionization detector (PID) and will be described in general accordance with the Unified Soil Classification System(USCS). Each soil sample retained for laboratory analyses will be capped at each end with Teflon® sheeting and plastic end caps. Soil samples and groundwater samples will be labeled, placed in chilled coolers, and transported under chain-of-custody procedures to McCampbell Analytical (ELAP# 1644) in Pittsburg, California for analysis. 4.3 GROUNDWATER SAMPLING METHODOLOGY Condor will use Hydropunch®or equivalent sampling techniques to collect groundwater data to assess the dissolved phase concentrations of volatile organic constituents (VOCs) and total petroleum hydrocarbons (TPH) in groundwater. A direct-push sampling rig will be used to advance the drill rods at the selected location. The drilling rods will be advanced to groundwater, at which point a groundwater sample will be collected using a Hydropunch®or similar sampler. A groundwater sample will be collected by driving the device to the desired sampling depth, exposing the sampling screen to allow groundwater into the device, and collecting the groundwater with a bailer. A water level meter will be lowered into the rod string to ensure that the rod connections and seals are watertight and groundwater has not leaked into the sampler prior to retracting the outer rod string and exposing the Hydropunch® screen. 5.0 LABORATORY ANALYSES Soil samples will be analyzed for VOCs by EPA Method 8260B, TPH as motor oil (TPH-MO), gasoline (TPH-G), and diesel (TPH-D) by EPA Method 8015B, and CAM 17 Metals by EPA 6000/7000 series Methods. The collected groundwater sample will be analyzed for VOCs and TPH by the same methods. Laboratory detection limits will be sufficient for comparison to regulatory thresholds. A 5-day laboratory turnaround time will be requested. The sampling plan is summarized in Table 1, on the following page. lkk� 41 CONDOR