SITE INFORMATION AND CORRESPONDENCE

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J 0 • Lopez Property Page 2 1601 Turnpike Road June 29, 2011 Stockton, California 95206 (2) Feasibility Study Report (FSR) AGE presents a omparison of groundwater and soil remedial methods to determine the most cost-e ective remedial method to mitigate the petroleum hydrocarbon contaminants at t iis site. • Soil remedial methods evaluated included ex-situ (excavation) and soil vapor extraction:(SVE); • Groundwater remedial methods evaluated included groundwater extraction (GWE) an in-situ chemical oxidation through ozone injection. (3) Final Remediation Plan (FRP) Based on the results from the studies listed above, AGE proposes to conduct an in-situ ozone sparging ( OS) pilot study and install and operate an SVE remedial system at this site. The proposed remediation systems will include the installation of four SVE — wells, VW-1 though VW-4, screened between 5 and 20 feet bsg; six shallow IOS wells, -F OW-1 through OW-6, screened between 30 and 32 feet bsg; and six intermediate water-bearing zone IOS wells, OW-7 through OW-12, screened between 60 and 65 feet bsg at locati ns illustrated on Figure 13 of the CAP. During advancement of the soil borings, AGE proposes to collect soil samples continuously from surface to total ---- depth for lithologic evaluation and select soil samples will be analyzed for TPH-g; benzene, toluene ethylbenzene, and total xylenes (BTEX); methyl tertiary-butyl ether (MTBE), ethyl tertiary-butyl ether (ETBE), tertiary amyl methyl ether (TAME), di- isopropyl ether ( IPE), tertiary butyl alcohol (TBA), 1,2-dichloroethane (1,2-DCA), 1,2- dibromoethane (EDB) and total lead. AGE proposes to operate the SVE system using SVE wells VW-1 through VW-4 and monitoring well MWA. During the first week of operation of the SVE system, AGE proposes to collect influent and effluent vapor samples daily and analyze the vapor samples for TPH g, BTEX, and MTBE. Following the first week, AGE proposes to collect vapor samples monthly for chemical analysis while continuing to monitor the SVE system weekly. AGE proposes to operate the IOS pilot test for six months. During the first month of operation, AGE proposes to monitor the ozone system weekly, which includes collection of groundwater samples for chemical analysis and identification of harmful byproducts generated by ozone injection. If detected, AGE proposes to terminate the pilot test and monitor wells until concentrations of chemicals of concern return to background cond tions. The EHD approves the proposed installation and operation of the SVE system and the IOS pilot test, pending approval from the California Regional Water Quality Control Board Central Valley Region of NOtiGE of Intent to comply with the terms of General Waste Discharge Requirements, and the Iv onitoring and Reporting Program No. R5-2008-0149-010.