COMPLIANCE INFO_1968-2006 - Laserfiche WebLink

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Work. at the second site began in 1977 to develop �.5 acres of an 18-acre , 35-ft-deep landfill into a new truck sales ana service center , including service bays , sales offices , and pars- ing areas. Disposal of about 170,000 tons of household and com- mercial solid wastes took place at this site between 1962 an'l 1964 (see Figure 1 ) . In 1976 , a gravel trench barrier system had been designea SCS Engineers and installed at the perimeter of this site to pre- vent subsurface LFG migration to adjacent areas requiring prote;- tion. Additional LFG control measures were identified and subse- quently implemented to protect truck maintenance and sales per- sonnel and structures . Facility construction began in 1979 anc was completed in 1980. In mid-1981 , the site lessee ceased oper- ations due to economic factors not related to the LFG control requirements at the site . SCS currently provides LFG system operation and routine maintenance services to maintain the prop- erty safe for occupancy until a new lessee can be located . LFG CONTROL MEASURES Drive-In Theater Site LFG control elements at the drive-in theater site include LFG extraction wells (drilled through refuse to native soils ) (see Figure 2) . These are spaced throughout the site interior t: prevent gas emissions at the site surface, and to protect on-site structures and appurtenant utilities . The extraction wells are connected via a horizontal header line to a pump station housing an extraction blower and ground flare. An additional 19 LFG extraction wells were installed around the site perimeter to con- trol off-site migration of LFG to adjacent properties . The LFG extraction well field has valving and sampling locations for adjustment of flow rates and vacuums. The collection system was designed with drains for condensate removal and flexibility to accommodate differential settlement resulting from the antici - pated settlement and decomposition of deposited waste mate- rials . The surface of the landfill was graded for drainage , provided a minimum 2-ft cover of soil , and surfaced with a rock and oil coating . Ingress and egress routes for theater patrons are paved with asphalt. The extraction well field is designed to create a neutral pressure or a slight vacuum (via an extraction blower ) within the landfill site. Extraction wells are spaced to distribute this vacuum uniformly throughout the site. System performance requirements include surface LFG emissions (through cracks in the surface) at less than 50 percent of the lower explosive limit (LEL) for methane in air. LFG produced within the radius of influence of an extraction well is drawn toward the well and removed . The LFG is subsequently combusted in a ground flare, which operates 24 hours per day , 7 days per week. LFG-68