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04/13/1995 08:37 <br />the mine. <br />303-782-0390 <br />II•I <br />~Ji' <br />CDH W~CD W~CC <br />s <br />PAGE 04 <br />From the flume house the water flows into one or both of two <br />polishing ponds to allow additional time to settle suspended <br />solids. The polishing ponds are also used for pH adjustment. If <br />the treated water pH is not within apecifleations, a sulfur;lc acid <br />(or equivalent) drip is used at the discharge to lower the: pH to <br />acceptable levels. <br />Wastewater is also collected from various surface facilities and <br />sent to a conventional activated sludge wastewater treatment plant. <br />The discharge water from this process (outfall Hend 003) iii mixed <br />with the treated water from underground at one of the po:Liahing <br />ponds. Used ethylene glycol from mine equipment is periodically <br />metered into the activated sludge plant, where it is brokE:n down <br />during the treatment process. <br />From the discharge of the second pond, the treated water :Le sent <br />through a pipeline to the adjacent (Urad) valley. The di~acharge <br />from the pipeline flows through a 24" measuring flume and is <br />designated outfall HUT. The water flows through one mores small <br />settling basin and then out into the Lower Urad Reservoir. This <br />discharge into Lower Urad Reservoir is designated outfal]. HESBO <br />(Hend 001). The Lower Urad reservoir (segment 7) is con~9idered <br />State waters and is not considered as part of the treatment system <br />for Henderson mine water. <br />The second polishing pond has an emergency spillway which is <br />designated as outfall Hend 002. Discharges from outfall Hand 002 <br />would be to the West Fork of Clear Creek (segment 4) , above the <br />Wood's Creek confluence. <br />2 <br />