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IV 4 minimize the possibility of groundwater and surface water contamination at the landfill, water from tributary drainage areas is diverted around solid waste deposition areas. The landfill surface is to be properly graded to avoid pockets of standing water which could leach through the disposed waste, and should be adequately sloped to promote surface runoff. A network of landfill surface drainage swales/berms has been shown on the Operating Sequence Plans. These drainage swales/berms are to be constructed a minimum of one-half percent grade on intermediate or final cover, as appropriate, as soon as the designated area is brought to the grades shown. It is very important for proper surface water runoff, that future landfill sideslopes be constructed with the terraces shown on Figures 3-3 and 3-4 of the infill segment permit application. On interim working surfaces between terraces, a minimum slope of 2 percent should be used with daily cover to encourage surface runoff. Permanent letdown pipes and inlet riser will be installed as each portion of the landfill undergoes formal closure. Berms are an essential element in preventing stormwater runon from outside the landfill, and to provide the sideslopes of many of the major ditches and ponds. Berms also provide controlled storage within the stormwater pond and delineate the south, north, and west perimeter ditches. Minor berms are grassed on the top surface and sodded with Pensacola bahia grass on the sideslopes from the top of the slope to the normal design water level. The top surface of perimeter berms and other major berms are used as roads. Most sideslopes are 3:1 slopes or 4:1 slopes. The berms should be closely inspected at least quarterly to insure that no erosion, undermining, or sloughing has occurred. Any holes or breaks in the soil cement roads should be promptly repaired. F-36 :