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<br /> ulks
<br /> Mr. Robert McClellon
<br /> February 28, 2006
<br /> Page 2
<br /> FIELD ACTIVITIES
<br /> From December 5, 2005 through December 9, 2005, URS conducted the vapor extraction pilot test at the
<br /> World Enterprises site. On December 5, 2005,Mr. Frank Guiardi of SJCEHD and Ms. Christine Babcock
<br /> of SJVAPCD, were met on site during the start of the pilot test.The vapor extraction pilot test field
<br /> activities were conducted in accordance with the activities described in the work plan and work plan
<br /> addendum(step test, sustained test, and optimization)except for the optimization portion of the pilot test.
<br /> Typically,the flow rate from each extraction well limits the maximum treatment rate of the vapor
<br /> extraction system-hence the need to connect multiple extraction wells to the vapor extraction pilot test
<br /> system to assess the maximum performance of the vapor extraction pilot test system. Since the vapor
<br /> extraction pilot test system was not limited by the flow rate from each well,the optimization portion of
<br /> the pilot test was not needed.The flow rate of the vapor extraction pilot system during the sustained
<br /> portion of the pilot test ranged from approximately 76 standard cubic feet per minute(scfm) to 104 scfm.
<br /> Before and after the pilot test, landfill gases (methane, oxygen, and carbon dioxide)concentrations were
<br /> measured from each probe and extraction well. During the pilot test, vapor samples were collected from
<br /> the inlet(influent) and outlet(effluent or discharge)of the thermal oxidizer using 6-liter summa canisters
<br /> during the first portion of the sustained test on December 7, 2005 and from the inlet of the thermal
<br /> oxidizer during the second portion of the sustained test on December 9, 2005. Ms.Christine Babcock of
<br /> SJVAPCD agreed that since an influent and effluent sample of the thermal oxidizer from the extraction
<br /> well with the highest methane concentration was collected during the pilot test, it was not necessary to
<br /> collect an effluent sample from the extraction well with the lowest methane concentration during the pilot
<br /> test.The vapor samples were taken to Air Toxics Laboratories in Folsom,California, for analysis under
<br /> chain-of-custody documentation. The vapor samples were analyzed for natural gas analysis using ASTM
<br /> Method D-1945 and for volatile organic compounds(VOC)by EPA Method TO-l5.
<br /> Following the completion of the pilot test, all equipment was removed from the site.
<br /> RESULTS
<br /> The following two sections provide the field measurements results and laboratory results.
<br /> Field Measurements
<br /> On December 2, 2005 (before the pilot test) and December 19, 2005 (after the pilot test), each probe and
<br /> each extraction well was measured for methane, oxygen, and carbon dioxide using a hand-held portable
<br /> landfill gas monitor(GEM 2000). These measurements were recorded in a field book and are described
<br /> below.
<br /> Before the Pilot Test(December 2, 2005). The methane concentrations in VW-1,VW-2,VW-3, VW-7S,
<br /> VW-7D, VW-8S, VW-9, and VW-10 were 0%. The methane concentrations in VW-4,VW-5S, VW-5D,
<br /> VW-6S,VW-6D, VW-8D, EW-1, and EW-2 were 6.7%, 14.7%, 13.9%, 15.7%, 10.2%, 0.1%, 17.0%, and
<br /> 16.5%,respectively. The oxygen concentration in all probes ranged from 0% to 21.2%.The carbon
<br /> dioxide concentration in all probes ranged from 0.7% to 31.2%.The results for each probe and extraction
<br /> well are summarized in Table 1.
<br /> After the Pilot Test(December 19, 2005). The methane concentrations in VW-1, VW-2,VW-3,VW-7S,
<br /> VW-7D,VW-8S,VW-8D, VW-9, and VW-10 were 0%.The methane concentrations in VW-4,VW-5S,
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