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rr � H)�drocarbon Breakthrough • Based on analytical results of the water sample collected from GAC #1 on May 2, 2001, ASE became aware that TBA and MTBE had broken th r o u g h the first carbon vessel Based on analytical results of the water sample collected from GAC #2 on May 31, 2001, ASE became aware that TBA had broken through the second carbon vessel The GAC #3 sample on May 31 , 2001 showed no breakthrough At no time during the month of May 2001 were any petroleum hydrocarbons discharged to the Manteca Sanitary Sewer Line Flow Rates During the month of May 2001, the system treated 182,010 gallons of groundwater While operating, the system extracted, on average, approximately 4 gallons of contaminated groundwater per minute The drop in flow rate was due to a biosllme buildup within the recovery wells and piping That material was removed from the wells in the middle of the month, and thus the gpm of each well noticeably increased Removal of the bioslime will become a monthly O&M task F,FFI,IJENT AND INFLUENT SAMELF COLLECTION AND AN T,YSES Effluent B�ater Sample 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 8 015 At no time during this month's operation, did the effluent entering t h e 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 On May 7, 2001, ASE collected an influent water sample (INF 05-07-01 ) This sample was analyzed by Kiff Analytical of Davis, California (FLAP #2236) for a full scan EPA Method 8260B and for TPH as diesel by EPA Method 8015 The analytical results for this sample are tabulated In t h e Frank's One Stop Remediation System Monthly Report — May 2001 - 2-