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62-701.500(10) STORMWATER MANAGEMENT SYSTEM OPERATION AND MAINTENANCE A description of the existing stormwater system for Segment 1 and Segment 2 prior to the infill expansion is provided in this section. The stormwater modifications required for the infill expansion are discussed in detail. The existing stormwater management system consists of a series of perimeter and internal ditches which are used to convey surface water runoff from solid waste disposal and operational areas to a 16 -acre stormwater pond. The ditches are generally shallow (2 to 5 feet) and vary in width from 10 to 40 feet to provide adequate conveyance. Bottom ditch elevations are from 19 to 25 feet NGVD. Installed conduits consist of 12, 24, and 36 -inch diameter corrugated metal pipe. Runoff from Segments 1 and 2 is conveyed through five sets of double pipes (24 -inch) diameter into the stormwater pond. Runoff from the north central portion of the site is conveyed by ditches to the northwest corner of the stormwater pond. Runoff from the operations building area is routed southward, then westward through an existing wetland area to the southeast corner of the stormwater pond. Stormwater from the C&D debris is conveyed westward, then northward to the culvert on the eastern bank of the stormwater pond. The stormwater pond, located just south of Segment 1 is a former borrow pond. This pond is 20 to 25 feet in depth and is steeply sloped due to its former use. The pond is kept artificially low, compared to the surrounding groundwater table by the pumping drawdown of an adjacent borrow pit pond, located south of the stormwater pond. The stormwater pond runoff is filtered things to soil berm which separates the stormwater pond from the borrow pond. The borrow pond is mined to obtain soil material and shell material for landfill operations and temporary onsite road construction. This pond initiated in 1988, has 41053 AO.Fge,,w�?y F-25 ,M~ itg-ITRir, 7x71 m m m