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not have an operational spillway since excess runoff is recycled <br />into the hydraulic mining processes. Accumulated sediment will be <br />removed when 60 percent of the volume accumulates to ensure that <br />the pond provides adequate storage at all times. <br />As discussed in Section 4.3.3.3 (Operation Plan--Permit Area), the <br />water system is essentially closed. All process water and inter- <br />cepted ground water is treated and recycled for use in the hy- <br />draulic mine. There are no planned discharges of this water, <br />accidental spills or overflows will be collected in Sediment Pond <br />A. Domestic waste water will be treated to meet applicable regu- <br />lations prior to discharge. <br />Several very small disturbed areas exist outside of the drainage <br />and sediment collection system. These include the powder magazine <br />(0.1 acre), west topsoil stockpile (1 acre), two topsoil stockpiles <br />at the north end of the site (total 1.05 acres), the pump house <br />(.002 acres), waterline (apprx. 1/3 acre), and the escape and <br />ventilation sites (total less than .001 acres). Due to the <br />gradient of the site, flow and sediment from these areas can not be <br />routed by gravity to Pond A. However, all of these sites will be <br />reclaimed and/or stabilized during the post-construction reclama- <br />tion period (soon after construction), except the waterline <br />corridor (25 feet wide). The placement of the waterline has not <br />disturbed the natural vegetation and soil which means that there <br />will be no change in the rate of runoff and Sediment production <br />from this corridor. Therefore, this area should be exempt from any <br />additional sediment control measures. The rate of runoff and <br />sediment production of the other areas will be low and comparable <br />to that of undisturbed areas. The runoff volume from each of these <br />sites during the 10-year, 24-hour event is provided in Exhibit 4.6- <br />1. The small amount of runoff from these miscellaneous areas can <br />be controlled by low berms on the down gradient sides of each <br />feature, which NCIG commits to maintaining at the design <br />capacities. The design capacities are provided in Exhibit 4.6-1. <br />NCIG - Coal Ridge #1 4-79 ABC/1145/910830 <br />