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�I Fortner Countryside Market,Stockton,California Feasibility Study and Interim Remedial Action Plan May 20,2013 Concurrent with permitting/approvals, all necessary remedial equipment will a coordinated and procured for delivery and installation at the Site. SGI will coordinate/oversee remedial installation by a selected contractor, which will include connecting AS wells to the compressed air conveyance lines, as well as connecting to the existing utilities. Further details of this work are detailed in subsequent sections. All construction-related work will be completed according to acceptable practices and local building codes. The following scope of work is proposed for installation, startup, and operation of the sparge system: ➢ Install a total of approximately 21 on-Site and off-site AS wells (Figur 3 8); Install a total of approximately four observation wells (two on-Site and two off-site) to monitor sparge system performance/effectiveness (Figure 8); ➢ Install one on-Site vapor well (VW-1) in the former UST area for po ential use as a vadose zone remediation well and/or as a shallow soil gas monitoring point during sparge system operations (Figure 8); ➢ Install a treatment compound, located in the northeastern portion of the Site. The compound will be placed on a concrete slab, fenced with sound proofing and/or enclosed via a shed (as needed), and placarded with hazard and emergency information in accordance with state and federal regulations; ➢ Utilize above-ground and below-ground sparge conveyance/carrier�iping; ➢ Install at least one air compressor that will operate between 5 to 30 pounds per square inch (psi) and provide between 0.5 to 10 scfm air flow per well; ➢ Utilize in-line compressed air particulate, coalescing, and oil vapor filters; ➢ Utilize at least one control panel that will include an air-proving switch and timer(s). The systems will completely shutdown during any substantial pressure drop that would be caused by a broken line, line leak, or other system malfunction; ➢ Provide power to operate the remediation equipment; ➢ Initiate startup of the treatment system. ➢ Evaluate system performance and environmental data, including gas injection pressure, and injection flow-rates in individual AS wells. In addition, bioremediation and geochemical indicator data will be collected in observation and/or groundwater monitoring Wells; and ➢ Present recommendations, as needed, for modification/augmentation of the proposed system and/or propose implementation of another treatment technology in conjunction or in sequence with sparging as part of a final RAP for the Site. Prior to any subsurface exploration, the work areas will be clearly del'neated for subsurface utility clearance. Underground Services Alert (USA) will be contacted a minin um of 48 hours prior to any subsurface exploration to allow underground utilities (where present) to a marked by USA members, and a private utility subcontractor will be utilized to clear each drilling locati n. Following approval of this IRAP by the CRWQCB and completion of the proposed feasibility testing/data collection activities, SGI will engineer the remediation system to provide detailed specifications for final Feasibility Study and!Feasibility Study&IW Ted Finat.dw 7-3 The Source Group,Inc.