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1 <br /> iBased on analytical results of the water sample collected from GAC #1 on <br />' November 2, 2001, ASE became aware that hydrocarbons had broken <br /> through the first carbon vessel The GAC #2 sample collected on that day <br /> and the remainder of the month showed no breakthrough All of the <br />' samples collected from GAC #2 during the month of December showed no <br /> hydrocarbon concentrations in the water samples, and thus no <br />' breakthrough from GAC #2 At no time during the month of December <br /> 2001 were any petroleum hydrocarbons discharged to the Manteca <br /> Sanitary Sewer Line See the analytical reports attached in Appendix B <br /> Flow Rate <br /> During the month of December 2001, the system treated 94,730 gallons <br />' of groundwater While operating, the system extracted, on average, <br /> approximately 4 gallons of contaminated groundwater per minute <br /> EFFLUENT AND INFLUENT SAMPLE COLLECTION AND ANALYSES <br />' Effluent Water .Saml2le.s <br /> Water samples were collected and analyzed on a weekly basis by ASE to <br /> determine the performance of the GAC vessels, per the City of Manteca <br /> lie Sewer Discharge Permit The samples were collected from the effluent <br /> side of the various GAC vessels When GAC #1 and GAC #2 were sampled, <br /> ASE also collected a sample from the next vessel in series and placed it on <br />' HOLD at the laboratory, as a back-up in case the sample being analyzed <br /> showed breakthrough All of these samples were analyzed by Kiff <br /> I Analytical of Davis, California (ELAP #2236) for total petroleum <br /> hydrocarbons as gasoline (TPH-G), benzene, toluene, ethylbenzene, and <br /> xylenes (collectively known as BTEX), the five fuel oxygenates and lead <br /> scavengers by EPA Method 8260B At no time during this month' s <br /> operation, did the effluent entering the sewer line contain any detectable <br /> concentrations of any of the compounds tested The effluent water <br /> sample analytical reports and chain of custody records are attached in <br /> Appendix B <br /> Influent Water Sample <br /> On December 14, 2001, ASE collected an influent water sample (INF 12- <br /> 14-01) This sample was analyzed by Krff Analytical of Davis, California <br /> (ELAP #2236) for TPH-G, BTEX, the five fuel oxygenates, and lead <br /> scavengers by EPA Method 8260B The analytical results for this sample <br /> are tabulated in the Tables Section of this report as Table One The <br /> • influent water sample analytical report and chain of custody record is <br /> attached in Appendix B A graph showing the historical TPH-G <br /> Prank's One Stop Remediation System Monthly Report — December 2001 <br /> -2- <br />