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Quarterly Monitoring and Sampling Report(Ql 2002) 3 Ranch Market,23569 Santa Fe Road,Riverbank,California April 26,2002 respectively Based on the Induced vacuum response (0 2 inches of water at 40 feet) and the slight rise in groundwater levels in off setting monitoring wells, the SVE radius of Influence was estimated to be 40 feet Although the air sparging did not result in an Immediate Increase in TPHg vapor concentrations, the increase in dissolved oxygen concentration and slight nse in the water table in offsetting wells Indicates a radius of influence of approximately 30 feet Details related to the feasibility test are presented in SECOR's Problem Assessment Report, dated November S, 2000 Final Remediation Plan SECOR submitted a Final Remediation Plan (FRP) on March 2, 2001, which was approved by the California Regional Water Quality Control Board, Central Valley Region, (RWQCB) in a letter dated March 26, 2001 The FRP explained details of the remedial plan, which proposed 10 soil vapor extraction (SVE) wells and 12 ozone sparge wells The SVE wells would be piped to a 500 scfm catalytic oxidizer and the ozone wells would connect to a 20 cfm ozone sparging unit Subsequent to the submittal of the FRP, SECOR expanded the remediation well array to include 11 additional ozone sparge wells, for a total of 23 ozone wells The system was expanded to destroy dissolved petroleum hydrocarbons over a greater area Domestic Wells Four domestic water supply wells are located within 340 feet of the former tank pit(Figure 2) Well# Location from Tank Pit Comments DW-1 90 feet west of tank pit Onsite well DW-2 120 feet south of tank pit Down gradient well (Well destroyed) DW-3 245 feet south of tank pit Down gradient of tank pit DW-4 340 feet south of tank pit Down gradient of tank pit DW-2R 200 feet south of tank pit Down gradient of tank pit (Well installed December, 2000) Water samples collected from domestic wells have been analyzed for the presence of BTEX, TPHg, five oxygenates, 1,2-dichloroethane (1,2-DCA), and ethylene dibrorrude (EDB) Since water samples collected from DW-2 contained reportable concentrations of MtBE, the well was taken out of service On April 6, 2000, SECOR's field technician interviewed the property owners or renters associated with the four domestic water wells and found that water pumped from wells DW-1, DW-3, and DW-4 was used for irrigation and domestic use All parties interviewed indicated they were drinking bottled water File Ranch MarketlReportlRiverbank-02-IQ