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carbon vessels were placed in-line as GAC #2 and GAC #3 Hyd,Qcarbon Breakthrough Based on analytical results of the water sample collected from GAC #1 on January 24, 2001, ASE became aware that TBA and MTBE had broken through the first carbon vessel Based on analytical results of the water sample collected from GAC #2 on that same day, no hydrocarbons or ' oxygenates were released to the Manteca Sanitary Sewer Line Based o n analytical results of the water sample collected from GAC #2 on February 7, 2001, ASE became aware that MTBE had broken through the second ' carbon vessel Based on analytical results of the water sample collected from GAC #3 on that same day, no hydrocarbons or oxygenates were released to the Manteca Sanitary Sewer Line I Flow. Rate During the month of February 2001, the system treated 219,220 gallons of groundwater Pumping was mainly concentrated on recovery wells RW-1, RW-2 and RW-3 due to the location of the plume on the site Recovery wells RW-4 and RW-5 were at times off or pumping less than 1 gpm The system was off due to a power failure in the third week of t h e month In general, each well in operation typically removed 1 5 to 1 8 gallons of groundwater per minute FEELTIEN1 AND INFLUENT SAMPLE COLLECTION AND ANAI,ySEs Effluent Water Samples 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 o n 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 I 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 B Frank's One Stop Remediation System Monthly Report — February 2001 - 2-