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Winterization Plan Forward Landfill 1991-1992 FACILITY DRAINAGE PROCEDURES Waste Management Units WASTE MANAGEMENT UNIT A (WMU-A) Surface water flow from WMU-A enters an east by west curb and gutter system along the northern property boundary paralleling the main entrance road. A six foot wide valley gutter was installed across the main entrance road to join the flowline of the curb and gutter. At the western end of the curb and gutter, water is channeled into the storm water retention basin north of WMU-D:89. The access road that lies between WMU-A and the retention basin are graded at 2%, directing all surface water to drain into the retention basin. Additionally, a drainage culvert was installed along the western boundary of WMU-A for surface water collection and diversion to the storm water retentionbasinnorth of WMU-D:89. WASTE MANAGEMENT UNIT B AND D-87 Surface water runoff from WMU-B and WMU-D:87 is directed to the south through a series of ridge and swale valleys into corrugated metal down drains. The down drains collect and divert surface water to the storm water retention basin located in the southwest portion ofthe facility. WASTE MANAGEMENT UNIT D-88 SOUTH AND E WMU-D:88 south, all surface water is directed through mass sheeting to a central collection culvert along the western portion of the pit. From the culvert, water travels north into a central collection depression (181x14'x4') where it is temporarily held. The water is then transferred to the Leachate Evaporation pond via a PVC piping system. WMU-E, all surface water is contained within the waste management unit and collected through the Leachate Collection Recovery System (LCRS). WASTE MANAGEMENT UNIT D-88 NORTH All surface water is directed to the west through mass sheeting. At that point, the water is channeled into a down drain and directed to a culvert. The culvert transfers the water into the southwest retention basin. 2