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Austin Road Landfill Landfill GG_Qration and Control Evaluation <br /> III. LFG Control Options <br /> Two general approaches to the expansion of the gas extraction system were considered. <br /> Alternative 1: Installation of perimeter extraction wells along the northern boundary on the east <br /> side of the site with a separate treatment unit such as a flare or catalytic device. <br /> Alternative 2: Installation of perimeter extraction wells along the northern boundary at the same <br /> locations considered for Alternative 1,with those wells tied into the existing system. <br /> The precise location of the perimeter extraction wells will be identified during the design phase of <br /> the project. Itis anticipated that the wells will be sufficiently south of the landfill boundary to be <br /> installed through the full extent of the waste fill below ground surface. The objective is to provide <br /> control,or containment,of LFG migration offsite and to extract relatively high quality gas,in terms <br /> of BTU value,by limiting the draw of oxygen into the system. <br /> A summary of the evaluation of the two alternatives is provided below in Table 4. Evaluation <br /> criteria are defined as follows: <br /> 1. Effectiveness of the modified system to control LFG migration. <br /> 2. System ease of operability in terms of integrating the two operational objectives— <br /> perimeter control and maximizing energy recovery. <br /> 3. Cost of construction and operation of the expanded system. <br /> Table 4 <br /> Alternative Evaluation <br /> Migration Control Operability Cost <br /> Effectiveness <br /> 1. Perimeter wells in Highly effective as a gas Complex operation with High cost with new <br /> the northeast extraction system two independent well treatment units. <br /> portion of the site devoted to perimeter fields in the same Requires permitting new <br /> with new treatment control. landfill. treatment facilities <br /> unit. through the San Joaquin <br /> Valley Unified Air <br /> Pollution Control District. <br /> 2. Perimeter wells in Effective as gas Relatively easy to Relatively low cost-no <br /> the northeast withdrawal is increased operate as the new new treatment facilities <br /> portion of the site at points of non- wells are part of an required. <br /> tied into existing compliance. existing system and will <br /> system. run continuously. <br /> CDM Camp Dresser&McKee 4 <br /> W98/2500/015 <br />