Laserfiche WebLink
Corral Hollow LFG System Audit and Upgrade Report ' <br /> Summary <br /> The existing LFG system and the newly-installed LFG extraction wells are able to capture LFG, ' <br /> provide site-wide source control and prevent any additional LFG from migrating into the vadose <br /> zone or groundwater. Steps have been taken to modify the physical components or operating ' <br /> elements of the landfill gas system to prevent landfill gas, to the extent possible, from entering <br /> groundwater throughout the entire footprint of the landfill and surrounding vadose zone adjacent <br /> to and beneath the landfill. ' <br /> During our field inspection, a negative vacuum was measured at all GCCS extraction points. <br /> Our review of operating data suggests the County has procedures in place to provide and ' <br /> maintain,to the extent possible, continued negative pressure in each well. <br /> The potential for LFG generation at the Corral Hollow Landfill is past its peak and declining , <br /> with time. Our review showed that a comprehensive GCCS is in place and that installation of <br /> additional extraction points is not warranted due to the relatively low gas generation potential <br /> and limitations on existing gas destruction equipment to accommodate additional low quality <br /> gas. <br /> The County has implemented operation and monitoring procedures in attempt to optimize LFG , <br /> collection (Appendix B). While the system is currently being operated to provide negative <br /> pressure at all extraction points, some wellfield adjustments continue to be made by the County <br /> to optimize LFG extraction capabilities and minimize flare downtime in the short- to medium , <br /> term. We recommend that the County continue to rebalances the wellfield monthly to maintain <br /> vacuum at all points, and optimize methane content at all in-fill extraction wells as described <br /> herein. <br /> 1 <br /> 1 <br /> 12 December 2013 <br />