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URS <br /> Mr. Robert McClellon <br /> July 14,2005 <br /> Page 3 <br /> These results will be used to prepare a flow vacuum response curve to identify potential ranges of flow <br /> rate and vacuum (in inches of water) for system operation. The oxidizer chart recorder will record the <br /> system flow rate; however, it is likely that this measurement will include make-up air as well as landfill <br /> gas. These data will not be included in the test results. <br /> Sampling Protocol <br /> Methane, oxygen, and carbon dioxide concentrations in the landfill gas extraction wells will be <br /> measured using a hand-held, portable GEM 2000 landfill gas monitor immediately before, during, and <br /> after the pilot test. <br /> At or near the completion of the first sustained test, vapor samples will be collected from the inlet and <br /> from the stack/discharge of the thermal oxidizer using summa canisters (or equivalent). At or near the <br /> completion of the second sustained test, a vapor sample will be collected from the inlet to the thermal <br /> oxidizer. These samples will be sent for analysis to the Air Toxics Laboratories and analyzed using EPA <br /> method TO-15 (for VOCs)and ASTM method D-1945 (for speciated light hydrocarbons). Sampling for <br /> VOCs will assist in assessing whether trace constituents are present in the landfill gas at the Site. <br /> Methane, oxygen, and carbon dioxide concentrations in the site monitoring wells will be measured <br /> before and immediately after the pilot test. <br /> Proposed Schedule <br /> As noted, we would like to begin this pilot test within 2 to 3 weeks following your approval and the <br /> concurrence of the San Joaquin Valley Air Pollution Control District(SJVAPCD). The analytical results <br /> for the collected vapor samples are expected within 2 to 3 weeks following the completion of the field <br /> activities. The results of this test (both process data and analytical data) will be transmitted to you and <br /> SJVAPCD within 30 days of the receipt of the analytical results. <br /> If you have any questions or require any additional information,please call me at(916)679-2081. <br /> Sincerely, <br /> URS Corporation Americas <br /> ay mine <br /> S i r Civil Engineer <br /> sures: Figure 1 —Site Plan <br /> Table 1 —Summary of Results <br /> cc: Fred Cruz(SJVAPCD) <br /> Judy McCampbell(RadioShack) <br /> Tony Garvin(Morgan,Lewis &Bockius) <br /> K:\Wprocess\25532\WorldEnterprise\GWMPIR\Ietter.doc <br />