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CAMP DRESSER & McKEE <br /> Dr. William F. Pilkington <br /> July 27, 1990 <br /> page 3 <br /> <br /> We feel that the most cost effective means of controlling thc methane migration <br /> problems at thc Cabarrus County Landfill is to install a methane gas cut-off vent <br /> trench along thc areas showt~ in the accompanying map. A typical design cross- <br /> section of this type of U'ench is shown in Exhibit A. For the trench to be effective, <br /> it must go below thc low seasonal water table. A PVC or HDPE sidewall curtain <br /> is used to prevent gas migration to the outside of the trenched area. <br /> <br /> If thc County concurs with this recommendation, it is recommended that plans and <br /> specifications for thc trench be developed and thc project be competitively bid out. <br /> If you have any questions or need any additional information, please do not hesitate <br /> to call mc. <br /> <br />Camp Dresser & McKee appreciates this oppo~unity to assist Cabarms County with <br />your solid waste management program. <br /> <br />Very truly yours, <br /> <br />CAMP DRESSER & McKEE <br /> <br />Joseph F. Wiseman, Jr., P.E. <br /> <br />JFW/tas <br /> <br />Enclosures <br /> <br /> <br />