COMPLIANCE INFO_1968-2006 - Laserfiche WebLink

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A 30amil chlorinated polyethylene (CPE ) membrane was in- stalled beneath the main concession building within the struc- tural slab (see Figure 3) . The slab is supported on concrete caissons which extend through the landfill to natural soil . Tne CPE membrane acts as backup protection for the concession buila- ing during active control system downtime. An automatic gas detection system was installed in the concession building to pr;,- vide continuous monitoring of the building interior to ensure that conditions remain safe for occupancy. y Subslab monitoring probes were installed beneath the main concession building to allow testing to verify that the LFG extraction system is providing adequate on-site control (see Figure 3) . Monitoring is also performed at cracks which may occur on the site surface to determine if vertical venting of LFA has been adequately controlled . A series of vertical monitoring wells were installed in native soils around the perimeter of the site to verify off-site subsurface LFG migration control effectiveness. Subslab probes , the perimeter monitoring wells , and site surface inspection/ testing program were designed to provide data for periodic adjustment of the active gas extraction system. The cost of LFG control systems is a function of many fac- tors , including landfill size , depth, and number and size of on- site structures requiring protection . The installed cost for control facilities at the drive-in theater site was about $10,000 per acre ( 1980 dollars) . Truck Sales/Service Center Site LFG control facilities installed at the truck sales/service center site are composed of the same basic components (and oper- ate using the same principles ) as those described above for the drive-in theater site. Fourteen extraction wells provide control of vertical venting of LFG (see Figure 4) . A CPE membrane in- stalled within the sales/service center building structural slab (supported on piles) provides backup protection during active system downtime. LFG is collected and continuously disposed of in a ground flare. The installed cost for the LFG control facilities at this site was about $15 ,000 per acre ( 1979 dollars ) . The higher cost per acre (as compared to costs for the drive-in theater site) is the result of similar fixed costs for ground flare and pump sta- tion components for a smaller landfill site. OPERATION AND MAINTENANCE A system operation monitoring and maintenance manual was provided with each design . Continuous operation and routine inspection and maintenance of LFG control facilities are required at both sites for continued occupancy. Responsibilities for LFG-70