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1 � <br /> the designed rate due to fouling of the carbon with a bio slime The b i o <br /> slime was coating the upper surface of the carbon and thereby reducing <br />' the flow of water through the GAC vessel Once ASE discovered the cause <br /> of the switch activation, measures were taken to remove the bio slime in <br />' GAC #1 to help minimize the shut-downs ASE's current scheduled <br /> maintenance activities include removing the bio slime from the transfer <br /> tank on a more regular basis in an effort to reduce the bio-fouling of t h e <br />' carbon canisters The system also automatically shut off one time due to <br /> a blown fuse on the vacuum pump <br />' Hy,�Locarhon Breakthrough <br /> Based on analytical results of the water sample collected from GAC #1 on <br /> October 17, 2000, ASE became aware that MTBE had broken through t h e <br /> first carbon vessel Based on analytical results of the water sample <br /> collected from GAC #2 on October 30, 2000, ASE became aware that <br /> several compounds had broken through the second carbon vessel After <br /> the breakthrough of hydrocarbons at GAC #2, vessels GAC #1 and #2 were <br /> I refilled with new carbon and GAC #3 was moved into the GAC #1 position <br /> On November 29, 2000, ASE was made aware that MTBE had broken <br /> through GAC #1 Based on samples collected from the effluent side of the <br /> next carbon vessel in-line, at no time did the system allow any compounds <br /> to be pumped to the Manteca Sewer Line <br /> Ghon Changeout <br /> On November 14, 2000, GAC vessels #1 and #2 were re-charged with 2000 <br /> I pounds each of virgin coconut shell 12 x 30 mesh activated carbon The <br /> spent carbon was removed by the new carbon supplier, Barneby Sutcliff <br /> The flow of contaminated groundwater was re-routed so that the new <br /> Icarbon vessels were in second and third place <br /> Flow Rate <br /> IBased on the hours of operation and flowmeter readings taken during the <br /> month, the system typically removed between 8 5 and 9 25 gallons of <br /> groundwater per minute <br /> I <br /> EV Zu,-nt Water SamRl_e <br /> Water samples were collected and analyzed on a weekly basis by ASE to <br /> Idetermine 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 /> Frank's One Stop Remediation system Monthly Report — November 2000 <br /> r -2 <br />