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CarbQn Changeout <br /> GAC canisters #1 and #2 were evacuated and replenished with virgin <br /> 1 activated carbon on April 19, 2001 <br />' Hy.Ar arhnn Rreakthroueh <br /> Based on analytical results of the water sample collected from GAC #2 o n <br /> April 11, 2001, ASE became aware that TBA had broken through the <br /> second carbon vessel ASE did not receive the analytical results for the <br /> April 11 GAC #2 sample until April 19, 2001, which happened to be the <br /> day that GAC #1 and GAC #2 vessels were replenished with new, virgin <br /> activated carbon Thus, the GAC #3 sample that was collected on April 1 1 <br /> was not requested to be taken from HOLD and analyzed ASE is confident <br /> that the GAC #3 vessel was capable of removing all the petroleum <br /> hydrocarbons from the influent stream prior to discharge to the Manteca <br /> Sanitary Sewer Line <br /> , low _Rata <br /> During the month of April 2001, the system treated 180,270 gallons of <br /> groundwater While operating, the system extracted, on average, <br /> approximately 5 2 gallons of contaminated groundwater per minute <br /> EFFLUENT AND INELITF.NT SAMPLE COLLECTION AND ANALYSES <br /> Effluent Water Samples <br /> Water samples were collected and analyzed on a weekly basis by ASE t o <br /> determine the performance of the GAC vessels, per the City of Manteca <br /> 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 />' Analytical of Davis, California (FLAP #2236) for a full scan EPA Method <br /> 8260B which includes total petroleum hydrocarbons as gasoline (TPH-G), <br /> benzene, toluene, ethylbenzene, and xylenes (collectively known as BTEX), <br /> and the seven fuel oxygenates, and for TPH as diesel by EPA Method 8 015 <br /> At no time during this month's operation, did the effluent entering the <br /> sewer line contain any detectable concentrations of any of the compounds <br /> tested The effluent water sample analytical reports and chain of custody <br /> records are attached in Appendix B <br /> ILaauent Water Sammi <br /> On April 9, 2001, ASE collected an influent water sample (TNF 04-09-01 ) <br /> This sample was analyzed by Kiff Analytical of Davis, California (ELAP <br /> Frank's One Stop Remediation System Monthly Report — April 2001 <br /> -2 <br />