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r rgranulated activated carbon (GAC) canisters, a carbon changeout was • completed on July 20, 2001 At that time, GAC canisters #1 and #2 were ' replaced with 2,000 pounds each of virgin carbon, and GAC vessel #1 was replaced with a new vessel ' Hvdrar.arhon Breakthrough Based on analytical results of the water sample collected from GAC #1 on ' June 20, 2001, ASE became aware that TBA had broken through the first carbon vessel Based on analytical results of the water sample collected from GAC #2 on July 20, 2001, ASE became aware that TPH-G had b r o k e n ' through the second carbon vessel The GAC #3 sample on July 31, 2001 showed no breakthrough At no time during the month of July 2001 were any petroleum hydrocarbons discharged to the Manteca Sanitary Sewer ' Line ' Flow Rate During the month of July 2001, the system treated 213,950 gallons of groundwater While operating, the system extracted, on average, ' approximately 5 gallons of contaminated groundwater per minute • EFFLUENT AND INFLUENT SAMPLE C_'CfT.i.F,,('UON AND ANALYSES Effluent Water Sample.1 Water samples were collected and analyzed on a weekly basis by ASE to ' determine the performance of the GAC vessels, per the City of Manteca Sewer Discharge Permit The samples were collected from the effluent ' side of the various GAC vessels When GAC #1 and GAC #2 were sampled, ASE also collected a sample from the next vessel in series and placed it on HOLD at the laboratory, as a back-up in case the sample being analyzed ' showed breakthrough All of these samples were analyzed by Kiff Analytical of Davis, California (FLAP #2236) for a full scan EPA Method ' 8260B, which includes total petroleum hydrocarbons as gasoline (TPH-G), benzene, toluene, ethylbenzene, and xylenes (collectively known as BTEX), and the seven fuel oxygenates, and for TPH as diesel by EPA Method 8015 ' At no time during this month's operation, did the effluent entering the sewer line contain any detectable concentrations of any of the compounds tested The effluent water sample analytical reports and chain of custody ' records are attached in Appendix B ' Influent Water SanjpL On July 18, 2001, ASE collected an influent water sample (INF 07- 18-01 ) This sample was analyzed by KYff Analytical of Davis, California (EE.AP ' #2236) for a full scan EPA Method 8260B and for TPH as diesel by EPA Frank's One Stop Remediation System Monthly Report — July 2001 ' -2-