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Mr. Robert McClellan <br /> December 8, 2008 <br /> Page 6 <br /> structure adjacent to the landfill entrance along the eastern landfill perimeter. As the data in <br /> Table 1 indicate, all probe intervals along the northern landfill boundary are less than 1,000 feet; <br /> thereby providing adequate monitoring of LFG migration in the vicinity of the correctional <br /> facility. It should be noted that LFG monitoring probe data for 2008 to date(through November <br /> 2008) indicates no exceedences of the methane concentration limit of 5 percent(see attached <br /> tables with 2008 monitoring results). Taking into consideration the minor extent of the spacing <br /> exceedences, the nature of adjacent land use, and the recent probe monitoring results,AWI <br /> believes that the potential for adverse impacts on the public health and safety and the <br /> environment from the current spacing is negligible, and requests that an exemption be granted <br /> for the three probe intervals previously listed. <br /> Regarding the interval along the western landfill boundary(between probes GP-1 and GP-25, <br /> AWI believes the installation of an additional probe is warranted due to the proximity of the <br /> residence, as shown on Figure 3. The proposed location of the new probe is approximately 390 <br /> feet north of GP-1 and 615 feet south of GP-25,which brings these probes into compliance with <br /> the 1,000 foot minimum spacing requirement. This location is approximately in line with the <br /> northern extent of the adjacent residential structures. The balance of this report consists of a <br /> work plan for installation of the proposed new probe. <br />