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. Hydrocarbon Breakthrough Based on analytical results of the water sample collected from GAC #1 on December 13, 2000, ASE became aware that MTBE had broken through the first carbon vessel Based on analytical results of the water sample collected from GAC #2 on December 22, 2000, ASE became aware that several compounds had broken through the second carbon vessel After the breakthrough of hydrocarbons at GAC #2, vessels GAC #1 and #2 were scheduled for recycling and changeout during the first week of January 2001 Based on samples collected from GAC #3, which had been re- charged on December 13, 2000, at no time did the system allow any compounds to be pumped to the Manteca Sewer Line Flow Rate Based on the hours of operation and flowmeter readings taken during the month, the system typically removed approximately 8 gallons of groundwater per minute EFFLUENT AND INFLUENTSAMPLE COLLECTION AND ANALYSES F7.uent. Water Same. Water samples were collected and analyzed on a weekly basis by ASE to idetermine 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 the 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 LnfLaeat Yater Sarno On December 16, 2000, ASE collected an influent water sample (INF 12- 16-00) This sample was analyzed by Kiff Analytical of Davis, California (ELAP #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 i n the Tables Section of this report as Table One The influent water sample analytical report and chain of custody record is attached in Appendix B Frank's One Stop Remediation System Monthly Report — December 2000 -2-