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ERL has concluded that P304C area impacts are the result of landfill gas <br /> effects. This situation is similar to P-320 area where contaminants are observed <br /> in deeper horizons of the outwash deposit. As previously noted the P304C well is <br /> screened 40-50 below the groundwater surface and located more than 500 feet <br /> from an unlined area of the landfill. Landfill gas effects are more common for <br /> water table wells in proximity to unlined landfill areas. The results for gas probe, <br /> GP-17 which is located directly adjacent to P304C, show no detectable levels of <br /> methane for monitoring conducted in recent years. Tetrahydrofuran and ethyl <br /> ether, which are signature parameters for leachate impacts for PC 17C, show <br /> increasing trends. The evidence for P304C indicates that leachate impacts are <br /> also occurring. <br /> P314C is located in a sidegradient orientation to P304C and the source <br /> area for groundwater at P314C may involve more extensive contamination. The <br /> screen position for nearby well P303C is roughly 20 feet in elevation above the <br /> screen elevation for P314C and may be missing potential contamination in the <br /> deeper portion of the outwash at this location. ERL must conduct additional <br /> contaminant investigation and monitoring in the vicinity of P304C, P320 and an <br /> area southeast of P314C. This approach is supported with emphasis on evaluating <br /> the deeper outwash. <br /> 14.) Dust,Noise, and Odor. Fugitive dust emissions off-site shall be controlled <br /> at the Landfill Site as necessary by undertaking the following: road surfaces <br /> within the Landfill Site shall be wetted with water or an appropriate chemical <br /> whenever off-site dust levels become unreasonable as determined by the City <br /> Environmental Administrator. Dust pollutives shall be utilized to the extent <br /> necessary on cover material such as stockpiles to reduce wind erosion as well as <br /> on other exposed surfaces as appropriate. Cover compaction and revegetation <br /> activities shall be undertaken promptly on the completion of various fill areas and <br /> vegetative cover capable of quick growth shall be utilized. Plantings of bushes <br /> and trees shall be installed if needed to buffer the Landfill Site and minimize wind <br /> erosion. <br /> All equipment and vehicles utilized at the Landfill Site shall be <br /> periodically inspected and maintained to minimize noise. Vegetative barriers <br /> along the boundaries of the Landfill Site shall be utilized to minimize off-site <br /> noise impacts. Applicable state standards for noise pollution may not be exceeded <br /> by the Landfill operation, equipment, vehicles, or machinery. <br /> Licensee agrees that it will use best management practices to control against <br /> odors. The Environmental Administrator may make recommendations regarding <br /> possible odor controls. If a verified odor problem is ongoing, both parties agree <br /> to institute good faith negotiations to minimize the odor problem. If in the event <br /> that the City receives ten or more complaints within a six-hour period relating to a <br /> single odor description and this odor complaint has been verified by both City and <br /> Licensee and identified as coming from the Facility, the Licensee shall cease such <br /> 18 <br />