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Air Sparging Pilot Test Related Activities Report and Remedial Action Work Plan Former Countryside Market, Stockton, California April 30, 2015 Toluene was detected above the laboratory reporting limits in five soil samples analyzed at concentrations ranging from 0.0061 mg/kg in OBS-1-106 to 220 mg/kg in VW-1-40; Ethylbenzene was detected above the laboratory reporting limits in six soil samples at concentrations ranging from 0.0026 mg/kg in OBS-1-106 to 130 mg/kg in VW-1-40; Total xylenes were detected above the laboratory reporting limits in six soil samples at concentrations ranging from 0.014 mg/kg in OBS-1-106 to 720 mg/kg in VW-1-40; Naphthalene was detected above the laboratory reporting limits in six soil samples at concentrations ranging from 0.0032 mg/kg in OBS-1-06 to 96 mg/kg in VW-1-40; and EDB and 1,2-DCA were detected at concentrations of 0.0026 and 0.044 mg/kg respectively in AS-2-95. Soil sample results are provided in Table 1 and illustrated on Figure 3. Laboratory analytical reports are included in Appendix E. 3.6.2 Soil Sample Physical Properties To facilitate remedial design, two soil samples were collected from OBS-1 at 110.5 feet bgs and VW-1 at 45 feet bgs. The retrieved stainless steel sleeves were capped with Teflon® tape, labeled, sealed in a Ziploc® bag. Sample identifications were recorded on a chain-of-custody (COO) and delivered to PTS Laboratories, Inc. of Santa Fe Springs, California, at the end of drilling activities. Sample V1N-1 collected at 45 feet bgs was analyzed for vadose zone soil properties by methods API RP 40 and ASTM D2216 and sample OBS-1 collected at 110.5 feet bgs was analyzed for hydraulic conductivity properties by methods API RP 40, ASTM D2216 and EPA 9100. Soil sample physical properties sample results are summarized in Table 2. Complete laboratory data is included in Appendix E. 3-4 The Source Group, Inc.