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2.0 LANDFILL GAS CHARACTERIZATION <br />The landfill gas characterization is based on analyses of samples <br />obtained from monitoring wells within the landfill and integrated <br />surface walks. This section describes the well and surface walk loca- <br />tions, well details, integrated surface walk equipment, sampling and <br />analysis procedures, and analytical results. <br />2.1 SAMPLING LOCATIONS <br />2.1.1 Landfill Ea W 11 <br />Five new monitoring wells were installed specifically for this ASWAT <br />study. Figure 1 shows the location of the monitoring wells. The <br />wells proposed in the ASWAT proposal were repositioned based on more <br />accurate site information obtained during the test program. The <br />southern boundary of the refuse was found to be further south than <br />indicated in the ASWAT proposal. Wells W-1, W-2, and W-5 were reposi- <br />tioned southward to cover more of this area. Well W-3 was reposi- <br />tioned northward since the original location was in the way of truck <br />traffic. <br />WTUMMUM-RXIVO <br />The surface of the Foothill Sanitary Landfill was investigated to <br />determine locations of potential gas seepage through the landfill <br />cover. A 50,000 -square -foot grid was plotted for the walking pattern <br />to be used while collecting surface air samples. Figure 1 shows the <br />location of the two grids for the integrated surface walks (SW -1 and <br />SW -2), and Figure 5 of Appendix A illustrates a typical walking <br />pattern. <br />One surface walk (SW -1) was originally proposed to sample the air over <br />the active landfill area as shown in Figure 2 of Appendix A. A second <br />surface walk (SW -2) was added during the test program to sample air <br />PJ9 9390405.00D 2-1 Rev. 0 09/07/88 <br />Emon Associates <br />