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alum <br />4 VALMUMMI <br />,, aWrnrccQlur_ <br />(rH U UC I 2U 2UUb 1 1 .23/51.11 , 2U/N0. 6333050714 P 5 <br />515 Alder Court, <br />Benicia, CA 94510 <br />Ph.: 707 7719009 <br />�--- Fax : 707 747 9996 <br />August 14, 2006 <br />Mr. Lochlin Caffey <br />Operations Manager <br />Keller Canyon Landfall <br />901 Hailey Road <br />Pittsburg CA 945+5 <br />Forward Landfill Inc. Leachate Pond Oyeslj <br />Leachate Collection and Reeovery System (LCRS) Gas Test <br />On August 10, 2006, Value Engineering conducted an LCRS Gas Test at the Leachate <br />Ponca (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 hexafluoride 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 bas 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 layur 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 Ramiercz of your staff was requested to pump all liquids from the <br />1, CRS 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 swap extraction pipe. If <br />gas is extracted and detected, the test passes. If no gas is detected from the LCRS sump <br />the test fails. The test is conducted in two phases: the Gas injection phase, and the Gas <br />Detection phase. All testing information was recorded on the attached LCRS Gas Testing <br />Form. <br />www.valuengineering.ua <br />