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rKum <br />(rH U oc I 2U 2UUb 11 :22/S I. 11 : 20/N0. 6333050714 P 2 <br />515 Alder Court, <br />Benicia, CA 94510 <br />Ph.: 707 7719009 <br />..:.> ® Fax : 707 747 9 <br />August 14, 2006 <br />Mr. Loci -Ain Caffey <br />Operations Manager <br />Keller Canyon Landfill <br />901 Bailey Road <br />Pittsburg CA 94565 <br />Forward Landfill Inc. Evaporation Basin MMIJ I1 <br />Leachate Collection and Recovery System (LCRS) Cas Teat <br />On August 10, 2006, Value Engineering conducted an LCRS Gas Test at the 1.0 acre <br />Evaporation 'in at the Forward Landfill in Manteca, California. Attached with this <br />letter are the resu the test. The test conducted was a Pass indicating that an open-air <br />conduit is present across t e CRS unit. <br />The test consists of injecting a high concentration of sulfur hexafluoride gag into the far <br />side of the LCRS system and al lowing 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 layer 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 Ramierez 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 from the LCRS sump <br />the test fails. The test is conducted in two phase! the Gas injection phase, and the Gas <br />Detection phase. All testing information was record d on the attached LCRS Gas Testing <br />Form. <br />www.valuengineering.us <br />