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Mr. Wes Johnson Project 16038-700.000 <br /> June 29, 1999 <br /> Page 4 <br /> The installation of additional groundwater monitoring wells in.either the shallow or deep <br /> zone could be considered an inordinately more expensive and less expedient method of <br /> exploration. It is apparent that leachate and groundwater migration is not the mode of <br /> release of VOCs from the landfill. The mode of release of VOCs from the landfill is <br /> transport by landfill gas, which consist mainly of methane and carbon dioxide. <br /> The control and remediation of the VOCs is through the control and remediation of the <br /> transport gas (i.e., methane and carbon dioxide). The most practical and expedient <br /> method of landfill gas control is through extraction at the landfill. <br /> Please call if you have any questions on this subject. <br /> Sincerely, <br /> EMCON <br /> 0 <br /> J. C. s am Ray Kaminsky <br /> ology Manager Senior Environmental Chemist <br /> Attachments: Table 1 - Predicted and Measured Soil Vapor and Groundwater VOC <br /> Concentrations <br /> Emcon <br /> SAC:\J:\PROJECTS\PJ6\60387000.AS-98\cbell:I Rev.0,06/29/1999 <br /> 16038-700.000 <br />