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Carbon ChanjeLaut <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 August 9, 2001 At that time, GAC canisters #1 and #2 were <br /> replaced with 2,000 pounds each of virgin carbon When it was <br /> discovered that GAC #1's interior bottom manifold had ruptured, the <br /> influent was redirected to GAC #2, and GAC #1 was taken out of the <br /> process loop <br /> Hydrocarbon Breakthrough <br /> Based on analytical results of the water sample collected from GAC #1 on <br /> August 9, 2001, ASE became aware that TPH-G and xylenes had broken <br /> through the first carbon vessel The GAC #2 and/or GAC#3 samples <br /> collected the remainder of the month showed no breakthrough At no <br /> time during the month of August 2001 were any petroleum hydrocarbons <br /> discharged to the Manteca Sanitary Sewer Line <br /> Flow Rate <br /> During the month of August 2001, the system treated 196,764 gallons of <br /> groundwater While operating, the system extracted, on average, <br /> approximately 4 4 gallons of contaminated groundwater per minute <br /> • <br /> EFFLUENT AND INFLUENT SAMPLE COLLECTION AND ANALYSES <br /> Effluent Water Sample� <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 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 /> Frank's One Stop Remediation System Monthly Report — August 2001 <br /> -2- <br />