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San Joaquin County Project Description <br /> charged twice the normal tipping fee. Litter is picked up regularly by landfill <br /> employees,County employee work-program participants, and/or sheriff s inmate <br /> crews on an as-needed basis along public roads leading to the landfill facility. <br /> Litter is also collected from adjacent properties,as needed,with the permission <br /> of the property owner. <br /> Litter control practices, including the requirement that incoming loads must be <br /> covered, would continue under the proposed permit revision. Increased daily <br /> disposal tonnage and increased incoming refuse vehicle trips proposed may <br /> increase the potential for road litter. Increasing the permitted landfill height <br /> would increase the potential for wind-blown litter when refuse is disposed in <br /> windy conditions at higher elevations. These factors would be mitigated by <br /> increased litter collection. 7 <br /> I <br /> Landfill Gas Control <br /> Municipal solid wastes(MSWs)placed in landfills such as the NCRC&SL <br /> undergo natural chemical and biological decomposition. The byproducts of <br /> biological decomposition of organic wastes are solids,liquids, and gases. The <br /> byproducts of aerobic(presence of free oxygen)decomposition of MSWs are <br /> carbon dioxide,water,and nitrates. Typical primary byproducts of anaerobic <br /> (lack of oxygen)decomposition are methane,carbon dioxide,water,organic <br /> acids,nitrogen, ammonia,iron sulfides,manganese,and hydrogen. Landfill gas <br /> (LFG)also contains trace quantities of volatile organic compounds(VOCs). The <br /> percentage by volume of methane in LFG may range from 50%to 60%,and <br /> carbon dioxide may range from 30%to 50%(Boyle 1977). <br /> Methane production from MSW will continue for periods ranging from a few <br /> years to hundreds of years,depending on specific environmental parameters: <br /> refuse composition,oxygen present,moisture content,pH,alkalinity,and <br /> temperature. <br /> Issues associated with LFG are listed below. <br /> ■ Subsurface migration of combustible gas across property boundaries and into <br /> onsite structures. <br /> ■ Potential for groundwater contamination by VOCs. <br /> ■ Emissions of VOCs into the atmosphere. <br /> ■ Odor control. <br /> Subsurface migration of combustible LFG,and the safety of onsite habitable <br /> ,J f structures,is monitored in accordance with the Methane Monitoring Program and <br /> CCR Title 27, Section 20919. To monitor subsurface migration,the County has <br /> installed seven monitoring probes along the perimeter of the landfill facility. <br /> These wells are near the landfill property boundary and consist of triple- <br /> completion wells to monitor at shallow,intermediate,and deep zones. To verify <br /> that onsite structures do not contain combustible gas,onsite structures are <br /> Notice of Preparation for the June 2006 <br /> North County Recycling Center and Sanitary Landfill 1-7 <br /> Permit Revision Jas 06307.06 <br />