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III. REGULATIONS <br /> In June, 1990, the California Integrated Waste Management Board <br /> (CIWMB) issued Regulations governing closure and postclosure of <br /> solid waste disposal facilities. These regulations require that <br /> a landfill gas monitoring network be installed at solid waste <br /> landfills. It is further required that the landfill gas be <br /> monitored to determine if gas is migrating off site. This Gas <br /> Monitoring Plan is designed to comply with the CIWMB's regulations <br /> for closure and postclosure. <br /> IV. SPECIFIC PLANS <br /> Twelve gas monitoring wells will be installed around the perimeter <br /> of the Harney Lane Sanitary Landfill. The proposed locations of <br /> the monitoring wells are shown on figure 3 (attached) . The wells <br /> will be spaced no more than 1000 feet apart and will be more <br /> concentrated on the west side of the landfill between the site and <br /> the Labor Camp. <br /> Each Monitoring well will contain three monitoring probes which <br /> will be placed at different depths (figure 4) . Each well bore will <br /> be a minimum of 30 feet deep and 611 in diameter. One monitoring <br /> probe will be placed at the maximum depth of the well bore, one at <br /> approximately one half the depth of the well bore, and one at <br /> approximately 5 feet below the ground surface. The depth of each <br /> probe maybe adjusted depending on the subsurface environment which <br /> can be determined during drilling. <br /> 5 <br />