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Carbon Chan geout <br /> Based on the analytical results of the weekly samples collected from the <br /> granulated activated carbon (GAC) canisters, a carbon changeout was <br /> completed on September S, 2001 At that time, each GAC canister was <br />' replaced with 2,000 pounds of virgin carbon <br /> Hydrocarbon Breakthrough <br />' Based on analytical results of the water sample collected from GAC #1 on <br /> September 7, 2001, ASE became aware that TPH-G had broken through the <br /> first carbon vessel The GAC #2 samples collected the remainder of the <br />' month showed no breakthrough At no time during the month o f <br /> September 2001 were any petroleum hydrocarbons discharged to the <br />' Manteca Sanitary Sewer Line <br /> Flow Rate <br />' During the month of September 2001, the system treated 170,186 gallons <br /> of groundwater While operating, the system extracted, on average, <br /> approximately 4 gallons of contaminated groundwater per minute The j <br />' total gallons treated during the month was less than previous months <br /> this was because ASE decreased the flow within the recovery wells because <br /> lie <br /> only two of the three GAC canisters were treating the water <br /> EFFLUENT AND INFLUENT SAMPLE COLLECTION AND SFS <br />' Fluent Water Sam.Ples <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 /> 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 o n <br /> HOLD at the laboratory, as a back-up 1n 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 five fuel oxygenates At no time during this month's operation, <br /> 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 /> I <br /> Frank's One Stop Remediation System Monthly Report — September 2001 <br /> I -2 <br />