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Quarterly Monitoring and sampling Report(Q4 2001) 3 Ranch Market,23569 Santa Fe Road Riverbank,Cahfomia January 3,2002 is 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 dlbromide (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 imgation and domestic use All parties interviewed indicated they were drinking bottled water Replacement of Domestic Well DW-2 On January 11, 2001, SECOR oversaw destruction of domestic well DW-2, located south of Ranch Market (Figure 2) Details of the well destruction are described in SECOR's DW-2 Well Destruction Report, dated January 23, 2001 On December 20, 2000, SECOR began oversight of the installation of domestic well DW-2R, the replacement domestic well for DW-2 From December 28, 2000 to January 5, 2001, the File Ranch MarketlReporMverbank-01-4Q