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that increased mine water inflow to Pond 2 was resulting in turbulence <br />which interfered with settling of suspended solids from process water, and <br />possible scour and re-suspension of sediments from the pond basin. EFCI <br />solved the problem by bypassing Pond 2 and routing gravity discharge <br />directly from Pond 3 to discharge point 003. Pond 2 became a closed <br />system with the process plant and effluent water quality returned to <br />acceptable levels. <br />While discharge from Pond 3 flows through the water treatment tanks. no <br />chemicals are utilized for water treatment, the water treatment system is <br />not currently utilized, and there are no plans for future water treatment. <br />Upon completion of mining, the water treatment tanks will either be <br />salvaged or demolished, any resulting debris will be disposed of in a <br />designated area, and the associated disturbed area will be reclaimed in <br />conjunction with reclamation of Pond 2. <br />Ponds. Impoundments and Diversions <br />• There are currently five (5) ponds and one (1) stream diversion within the <br />Southfield mine area and two (2) ponds within the Southfield loadout area <br />as shown by the Mine Surface Facilities Map, (Map 18) and the Loadout Area <br />Surface and Groundwater Hydrology Map, (Map 13), respectively. All ponds <br />were constructed by Dorchester prior to EFCI's purchase of mining and <br />loadout operations in early 1985. EFCI has subsequently modified the two <br />(2) ponds in the loadout area to improve their effectiveness and bring <br />them into compliance with applicable regulatory standards. <br />The five (5) ponds located in the Southfield mine area include, Freshwater <br />Pond No. 3 located adjacent to the coal refuse stockpile, Water Treatment <br />and Recycle Pond No. 2 located in the mine facilities area, and <br />Sedimentation Ponds No. 1, 4 and 5. Ponds Nos. 1 and 5 are located in the <br />mine facilities area and Pond 4 is located adjacent to the coal refuse <br />stockpile. All sedimentation ponds have been designed utilizing standard <br />engineering practices to retain the runoff from a 10-year, 24-hour storm <br />• event and effect compliance with other applicable regulatory standards. <br />C.1 W OR K 1 PR-lbP2MER 6. R E V <br />a~,~~~~ 2.05.3.44R Revised - April 1993 <br />