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FROM (FROOCT 20 2006 11 :23/ST. 11 :20/N0. 6333050714 P 6 <br /> 515 Aider Court, <br /> dVALU Benicia, CA 94510 <br /> Ph. : 707 7719009 <br /> .�.- ENGINEERING Fax :707 747 9996 <br /> August 14,2006 <br /> Mr. Lochlin Caffey <br /> Operations Manager <br /> Keller Canyon Landfill <br /> 901 Bailey Road <br /> Pittsburg CA 94565 <br /> Forward Landfill Inc.Leachate Pond est <br /> Leaebate Collection and Recovea Swstem (LCRS) Gas Test <br /> On August 10, 2006, Value Engineering conducted an LCRS Gas Test at the Leachate <br /> Pond (West)at Forward Landfill in Manteca, California. Attached with this letter are the <br /> results of the test. The test conducted was a Pass indicating that an open-air conduit is <br /> present across the LCRS unit. <br /> The test consists of injecting a high concentration of sulfur hexafluoridc gas into the far <br /> side of the LCRS system and allowing the gas to migrate through the unit to settle in the <br /> low point of the LCRS sump. The non-toxic sulfur hexafluoride gas is heavier than air <br /> that allows it to migrate to the lowest point of the sump. Once the gas has migrated <br /> through the system, it can be extracted and detected from the sump extraction pipe <br /> indicating that an open-air conduit is present through the unit. If excessive liquid is <br /> backed up into the drainage flyer of the LCRS, the gas will not be able to migrate to the <br /> sump. If a significant amount of liquid is in the LCRS sump, the liquid will block the <br /> sump extraction pipe and no gas can be extracted or detected from the system. Prior to <br /> the test,Mr. Rueben Ramicrez of your staff, was requested to pump all liquids from the <br /> LCRS sump. <br /> The; LCRS gas test is a qualitative test and determines if an open-air conduit exists <br /> through the unit and if liquid present in the sump is blocking the sump extraction pipe. If <br /> gas is extracted and detected, the test passes. If no gas is detected-frons the.LCRS sump <br /> the test fails. The test is conducted in two phases: the Gas Injection phase, and the Cras <br /> Detection phase. All testing information was recorded on the attached LCRS Gas Testing <br /> Form. <br /> www.valuengineering.us <br />