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In accordance with the Closure Regulations Section 17783 . 3 (a) (2) <br /> A-F, the gas monitoring network was designed to account for the <br /> following: <br /> A. Local soil and rock conditions. <br /> B. Hydrogeological conditions at the facility. <br /> C. Location of buildings and structures relative to the <br /> waste deposit area. <br /> D. Adjacent land use, and inhabitable structures within 1000 <br /> feet of the landfill property boundary. <br /> E. Man-made pathways, such as underground construction. <br /> F. The nature and age of waste and its potential to generate <br /> landfill gas. <br /> Local soil conditions show a mixture of sand, silt, and clay <br /> layers. It was attempted to place probes in sand or silt layers. <br /> Data gathered from the four groundwater monitoring wells at the <br /> landfill indicates average groundwater elevation (taken from the <br /> 1st 1/4 Monitoring Report) is approximately -21 feet. The deepest <br /> gas monitoring probe is at approximately elevation 45 which is <br /> approximately 66 feet above the groundwater table. <br /> The gas wells are more concentrated on the west side of the <br /> landfill because of the proximity of the Labor Camp and the <br /> adjacent farmer's shed. As shown in Table 1, spacing between gas <br /> wells does not exceed 1000 feet. <br /> 9 <br />