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October 2000 -39- <br />(2) Barrier Layer Thickness <br />003-2191 <br />The thickness of the clay liner will be a minimum of three feet of re-compacted clays <br />compacted per the specifications described th Appendix 6. If needed, a GCL liner <br />system will be installed per the manufacturer specifications set forth in Appendix 6. <br />(3) Bamer Layer Porosity <br />Porosity is the void space in a rock or soil not occupied by rock material. Porosity n, is <br />expressed as the percentage of the volume of voids divided by the total volume of soil. <br />The tests results of the clay analysis in Appendix 14 provides an estimate of porosity for <br />the re-compacted clay liner of approximately 40%. Specifications for a GCL liner <br />system have been discussed in Appendix 6. <br />(4) Slope of the Barrier Layer <br />• <br />The barrier layer on the floor will be graded to slope from 4% to 6%, averaging 5%. <br />The natural strata dips to the west at approximately 3% based on the elevations of the <br />marker sand shown as the "A" sand in Appendix 1B. The base grade of the facility has <br />been shown on Drawing 3. In no case is the proposed slope of the barrier layer less <br />than 4% which will promote drainage of any leachate. <br />(5) Hydraulic Head on the Barrier Layer <br />The hydraulic head on the barrier layer will be no more than 1 foot. This is ensured by <br />low leachate rates because of the climate of the site and the spacing of leachate <br />collection pipes at approximately 150 feet. The slope of the system including the liner <br />and the leachate collection system will be installed to utilize grades of more than 4%. <br />This will also limit the hydraulic head that could form on the liner system. See the <br />• leachate collection system. <br />VW/!191/1191SW~IisPeemi~l000,doc Sedalia Recycling Center and Repository <br />