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4.3.3.9 Construction of Surfa~;e Facilities <br />NCIG will use construction materials adequate for the engineering • <br />parameters to support and/or enclose all structures with more than <br />required margins of safety. Tc minimize impacts to the hydrologic <br />balance and to control potenti,~l minor impacts from assorted coal <br />preparation reagents, the fc•undations and other construction <br />parameters of the surface facilities will be as follows: <br />4.3.3.9.1 Preparation Plant <br />Heavy equipment and the supporting structures may require concrete <br />footings built over pylons. Once the footings and necessary <br />plumbing and electrical piping are in place, a layer of clay <br />(synthetic material) will be )laced and compacted to form a low <br />permeability membrane, followed by a concrete foundation. <br />Internal drainage will be established to a centralized sump or <br />collecting system where pumps can recycle coal or rock fines and/or <br />reagents for appropriate discharge back to the <br />preparation/dewatering circuit. The facility will have wash down <br />capabilities through this collection and recycling mode. The wash <br />down will reduce the quantity of fines released to the atmosphere. <br />4.3.3.9.2 Thickener <br />The thickener will be constructed of concrete or concrete, steel <br />and synthetic materials. Prior to the construction of the thick- <br />ener the site will be prepared with a local clay base to minimize <br />seepage and prevent contamination of the local )~ydrology. <br />The concrete base will be sloped to a central sump where pumps will <br />remove the effluent stream and direct it to the belt/filter presses <br />NCIG - Coal Ridge #1 4-34 ABC/1145/910509 • <br />