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� 1 EXECUTIVE SUMMARY FOR THE 1, FINAL REMEDIATION PLAN, r ARCO FACILITY 2093, TRACY, SAN JOAQUIN i + SITE CODE 1416 ARCO Products Company (ARCO) proposes to remediate gasoline contaminated soil and groundwater at ARCO Facility 2093, located at 3425 Tracy Boulevard in Tracy, California. Soil contamination is concentrated in the capillary fringe and will be remediated by extraction of vapors from contaminated areas. Extracted soil vapors will be treated by catalytic oxidation. Groundwater is contaminated by low concentrations of petroleum hydrocarbons which will be remediated by sparging, in conjunction with vapor extraction. Groundwater will only be extracted if sparging is not successful in remediating the contamination, or if there is a need to lower the groundwater table to facilitate vapor extraction. If groundwater is extracted, it will be treated using granulated activated carbon (GAC). Air discharges will be regulated under a permit to be issued by the San Joaquin County (w.; Valley Unified Air Pollution Control District. Groundwater discharge, if needed, will be regulated under a National Pollutant Discharge Elimination System (NPDES) and local permits as required. An NPDES application is on file with the California Regional Water Quality Control Board, Central Valley Region and can be finalized if necessary. Twelve single completion groundwater monitoring wells(ATR-1 through ATR-12),one dual completion groundwater monitoring/air sparge well (SMW-1), seven dual completion soil vapor extraction/air sparge wells (VES-1 through VES-7), three air sparge wells (S-1 through S-3), and one groundwater extraction well (TEX-1) exist at the site. All of the groundwater monitoring wells are currently sampled on a quarterly basis. During remediation nine of these wells will continue to be sampled on a quarterly basis. The effectiveness of the remediation will be measured by the concentration of constituents in these wells. t