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material (broken concrete and asphalt) for continuous access during <br />inclement weather. Landfill equipment haul roads will also be provid- <br />ed where needed within the excavation and on refuse fill surfaces. <br />4.8 UTILITIES <br />Electrical power will be required for building and area lighting, <br />building heating, communications, pumping, and power tools. Power <br />will be provided from the existing utility lines along Harney Lane. <br />Utility companies operating in the area should be contacted to deter- <br />mine various utility requirements for the project. <br />Sufficient on-site water in the existing pond in Module 9 will be <br />maintained so that dust -control and fire -protection vehicles can be <br />rapidly filled. Potable water will be made available by emplacing on- <br />site wells. Wastewater from the site will be discharged into an on- <br />site septic tank system. <br />4.9 LANDFILL SLOPES AND FINAL SOIL COVER <br />Final landfill slopes will be constructed no steeper than 12 percent. <br />Minimum final surface slopes of 3 percent (after settlement) will be <br />used to provide sufficient slope for surface -water runoff. Drainage <br />swales will be necessary at three locations and will be constructed <br />and maintained at a minimum 2 percent slope to divert surface drainage <br />away from covered wastes. <br />The completed landfill will be covered with at least 4.5 feet of cover <br />material consisting of the following: <br />• A minimum 24 -inch foundation layer of compacted interme- <br />diate soil cover placed over selected waste fill <br />• A minimum 12 -inch layer of clayey soil compacted to <br />achieve a hydraulic conductivity of 1 x 10-6 cm/sec or <br />less, placed over the foundation layer <br />PJ9 9390209A.00D 21 <br />