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Former Countryside Market,Stockton,California May 20,2013 Feasibility Study and Interim Remedial Action Plan requirements. PID readings will be taken from observation wells at approximate 30-minute intervals for the first 4 hours and then approximately every one to two hours for the remaining duration of the test (up to 8 hours of injection), via a sample port install at each respective well head. Tedlar bag samples will be collected at the start and end of sampling from select wells using a vacuum pump. Start and end groundwater samples may also be collected, if feasible (i.e. little to no residual pressure is found after the testing and wellhead seals can be removed to allow downwell sampling with a bailer). The vapor and groundwater samples will be submitted under proper chain-of-custody protocol to a State-certified laboratory for analysis by EPA Method 8260 f�r TPHg, BTEX compounds and oxygenates (tert-Amyl Methyl Ether[TAME], tert-Butyl alcohol [TBA], 1 -Dibromoethane[EDB], 1,2- Dichloroethane [1,2-DCA or EDC], Diisopropyl ether [DIPE], Ethyl-tert-Bu I Ether [ETBE] and Methyl- tert-Butyl Ether[MTBE]). 5.2 Background Bioremediation and Geochemical Indicator Data ollection Plan Prior to conducting feasibility testing activities, SGI proposes to collect bioremediation and geochemical indicator data from all of the existing monitoring wells, and proposed wells AS-1, AS-2 and OBS-1, to help determine the extent to which such processes are occurring, and provide baseline data that will be used to monitor and evaluate future remedial effectiveness/confirm the conditions within the plume are favorable for the destruction of petroleum hydrocarbons. Such data will also be critical for evaluating the viability of enhanced bioremediation and chemical oxidation technologies should it be determined that the optimal remedial approach for the Site is to utilize these technologies in conjunction and/or in sequence with sparging. Additionally, the data could also prove useful in the unlikely event that sparging is determined to not be feasible for implem ntation at the Site in which case the results will help to confirm if the existing conditions within the pl me are favorable for the use of one or more alternative technologies. Background field parameters that will be monitored using an In-Sitw, Inc. Troll® 9500 unit (or equivalent) include DO, ORP, conductivity and pH (pH of groundwater has a strong effect on the two primary processes that can most efficiently destroy 1,2-DCA). In addition to field measurements, groundwater samples collected during the next monitoring event will be analyzed for the following: ➢ Ethane, Ethane, Methane and Carbon Dioxide; ➢ Sulfate, Nitrate and Chloride; ➢ Total Organic Carbon (TOC); ➢ Dissolved Iron; ➢ Fatty Acids; and ➢ Iron and Manganese. Feasibility Study and lFettability ShAy 81RAPText Finalbm 5-7 The Source GreUP,hlC.