were evaluated based on monitoring of the vacuum zone of influence, landfill gas flow rate, methane (CH4), oxygen (O2), nitrogen (N2) and carbon dioxide (CO2) data, using a GM 5000 field instrument. The vacuum measurements were made using a Magnehelic gauge at 50-foot (15m) intervals along the length of the trench. As presented in Figure 5, the vacuum along the trench decreased from 4.5-2.9 inches (114 to 74 mm) of water column (WC) in the traditional LFG collector as compared to 1.5-0.88 inches (38 to 22 mm) of WC in the minitube blanket. Therefore, a vacuum loss was higher in the traditional LFG collector as compared with the minitube blanket (65% versus 58%), indicating a better distribution of vacuum along the trench by the minitube. FIGURE 5 Vacuum dissipation along trench www.GeosyntheticsMagazine.com 21http://www.winfabusa.com http://www.GeosyntheticsMagazine.com