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9M <br />September 27.201 l <br />Ni1r. Don Litchfield <br />.L-ti%,iroiiiiienttil.tM&ti,,iger <br />ForwardLa tid ri It <br />9999 S. Austin Road <br />j 'vnn, f, �e <br />ca CA 9.5136 <br />743 Kearney Street, <br />Benicia, CA 94510 <br />Ph.: 707 7719009 <br />Fax: 707 747 9996 <br />Forward Landfill Inc. Leachate Ponj( Mlesjt <br />Leachate Collection and RecovenSystein (LCRS) Gas Test <br />near Ar. Litchfield: <br />On ALIgUSt 5, 20 11 '. VI[Ue Engineering conducted an f .('RS Gas '('est at the Leachate <br />Pond (West) tat Forward I.Andfill inWanteca, California. Attached with this letter are the <br />results of the test. The test conducted was a Pass indicating that all open-air conduit is <br />present across the LCRS ti :wit. <br />The test consists of injcctinga high concentration ot'sulfur hexa fluoride gas into the far <br />side of the LCRS system and allowing; the gas to migratte through flic unit to settle in the <br />low point of the LCRS stump. The non-toxic sulfur liexafluoride gicis is heavier than air <br />ttiatitiloi,vsittoi.tilgraLetothe lt)vvestpoint ofthe stamp. Once the gas has migrated <br />through the system, it can be extracted and detected from fie sump extraction pipe <br />hiclicating taint an open-air conduit is present through the unit. If excessive liquid is <br />backed tip into the drainzige layer of the LCRS, flic gas will not be able to migrate to the <br />sump. If as significant amount of liquid is in the LCRS unip, the liquid will block the <br />stamp extraction pipe ay.d no gas can be extracted or detected from Nit, system. Prior to <br />the test, your staff vas requested to pUtripall liquids from the I.,C*RS sump. <br />The LCRS gas test is a qualitative test turd determines if in 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. '[Iie test is conducted in bwo phases- the Gas Irijection please, and the Gas <br />Detection phase. All testing information was recorded on the attached LCRS Gas Testing <br />Form. <br />...... . ... <br />,www.valuenginee ri ngiis <br />