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i <br /> Foothill sanitary Landfill Preliminary Closure Plan <br /> Revision #1 May 6, 1994 <br /> LEACHATE CONTROL MEASURES <br /> A dendritic Leachate Collection and Removal System will be <br /> installed in all future modules. The system will be constructed <br /> as each module is excavated. It will consist of 2' of clay (1. 0 <br /> X 10-7 cm/sec permeability) overlain by a High Density <br /> Polyethylene (HDPE) liner, a geonet, leachate collection pipes, <br /> and a leachate collection sump. <br /> 6 . COST <br /> Although the leachate collection and removal system <br /> will be installed before closure, additional work will <br /> be required, such as leachate treatment, monitoring, <br /> and maintenance. <br /> Treatment, monitoring, maintenance = $10, 000 <br /> DRAINAGE SYSTEM INSTALLATION <br /> The drainage system will consist of perimeter ditching and <br /> natural finished drainage contours on the landfill surface. <br /> Since drainage features will be constructed as the site is <br /> developed,. it is estimated that to provide closure drainage at <br /> any time in the landfill life would require a modified drainage <br /> system design. It is estimated that approximately 1, 500 feet of <br /> ditch would be sufficient to complete the drainage system. It is <br /> estimated that a $1, 500 a day construction crew could grade about <br /> 500 feet of ditch per day. A crew would probably consist of a <br /> motorgrader, Caterpillar tractor, scraper, 2 operators, 1 <br /> , laborer, and 1 grade setter. <br /> 7 . COST <br /> Construction: <br /> ($1, 500 X 1, 500ft/500 ft/day) _ $4,500 <br /> 24 <br />