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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 /> 1 <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 /> ' Emon Associates <br />