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4 <br />' March 7, 2001, ASE became aware that TBA and MTBE had broken through <br /> the first carbon vessel Based on analytical results of the water sample <br /> collected from GAC #2 on that same day, no hydrocarbons or oxygenates <br /> were released to the Manteca Sanitary Sewer Line Based on analytical <br />' results of the water sample collected from GAC #2 on March 16, 2001 , <br /> ASE became aware that methanol had broken through the second carbon <br /> vessel ASE believed that this methanol concentration was due to a <br /> contamination of the sample bottles Our laboratory, Kiff Analytical, <br /> suggested washing out the preservative from the bottles prior to sampling <br /> Our theory was confirmed when the following week's sample was <br />' collected in un-preserved bottles and the results were non-detectable for <br /> all compounds tested ASE did not alert the City of Manteca personnel of <br /> the breakthrough because of our belief of the sample bottle <br /> contamination Based on analytical results of the water samples collected <br /> from GAC #2 for the last two weeks of the month, no hydrocarbons o r <br /> oxygenates were released to the Manteca Sanitary Sewer Line <br /> Flow Rote <br /> During the month of March 2001, the system treated 200,420 gallons of <br /> groundwater The system was found off during a visit in the middle of t h e <br /> month due to a pressure buildup in GAC #1, which was subsequently <br /> backflushed to relieve the problem All of the recovery wells were surged <br /> and evacuated to clear the wells of suspected bioslime ASE removed <br /> approximately 10 gallons of bioslime and water from each recovery well <br /> Flow rates increased measurably after the surging and evacuation of the <br /> bioslime The system extracted, on average, approximately 45 gallons of <br /> contaminated groundwater per minute <br /> EFFLUENT AND INFLUENT SAMPLE COLLECTION AND ANAI,ySgsFffluent Water SampleI <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 /> I 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 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 S 015 <br /> At no time during this month's operation, did the effluent entering t h e <br /> Frank's One Stop Remediation System Monthly Report — March 2001 <br /> 2 <br />