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3.2 Treatment Plant <br />The stored water will be pumped to the water treatment trailer, which has been designed <br />to operate at 20 GPM or less. This treatment rate is approximately three times the <br />minimum size requirement for the estimated steady-state flow conditions when the mine <br />is not operating. This will allow for sufficient flexibility to operate the plant on an as <br />need basis and will not require weekend operations of the plant if so desired. <br />The treatment plant; shown on Drawing 07017-G-Ol Rev 1, is a fully self-contained <br />treatment unit, complete with mix tanks, reaction tanks, and reagent storage. Electrical <br />power may be supplied by a generator or line feed. <br />Chemicals from the reagent mix tanks aze added to the untreated water as it is pumped <br />from the Untreated Water Tank to the two, 335-gallon reaction tanks. The reaction tanks <br />are sized to allow for at least 17 minutes of retention time per tank. Design calculations <br />indicate that only one tank is needed; the second tank provides flexibility of operation <br />and the potential for treating higher flows if needed. <br />The trailer has three (3) reagent mix/storage tanks; each tank has approximately 300 <br />gallons of storage. The first two tanks are for barium chloride and the third tank is for <br />ferric sulfate. One of the two barium chloride tanks can be converted to a lime tank, if <br />lime addition is required in the future. Each tank is equipped with an agitator to properly <br />mix each reagent. The operator will first fill the tank with water and then add the <br />appropriate weight of reagent. The agitators within each tank will be operated constantly <br />to ensure proper mixing or suspension of reagent. Reagents will be fed (metered) into the <br />water at the designed dose rate. The reagent dosing pumps are adjustable to provide more <br />or less dosing depending on flow rates and water quality. The projected initial dose rate <br />for each reagent is shown in table 3.1: <br />To insure adequate contact with the water and the reagents, the dosed water is fed into an <br />inline static mixer. The chemical reactions start in the static mixer and continue as the <br />water and reagents mix in the reaction tanks. The reaction tanks aze fed via the pump in <br />the Untreated Water Tank; the first reaction tank will overflow by gravity into the second <br />tank. The final treated water will dischazge from the second reaction tank by gravity and <br />flow into the Settling Tank. <br />3.3 Settling and Polish Tanks <br />The treated water discharges from the trailer via gravity flow into a Settling Tank for <br />collection of the precipitated sludge. The precipitate formed by the addition of barium <br />chloride and ferric sulfide is an insoluble solid (sludge) that naturally settles and <br />sepazates from the treated water. To insure complete sepazation of the solids from the <br />treated water, the water gravity flows into a second small tank (Polish Tank) before being <br />dischazged. The water in the Polish Tank is dischazged to the neazby drainage via a <br />HDPE pipe. <br />9 <br />