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The discharge into Pond No. 1 pis through a perforated pipe which runs along the east side of <br /> the pond. A brown sludge precipitates as water moves from east to west in Pond No. 1. The <br /> Sludge settles out before it reachirs the discharge pipe at the west end. The cleaning of Pond No. <br /> 1 occurs about every seven weeps and takes about one week to complete. Discharge is diverted <br /> to Pond No. 2 while Pond No. 1 is being cleaned. Pond No. 2 is cleaned once every year. All <br /> sludge is transported in tanker trucks to the tailings facility near the Mayflower Mill. <br /> The discharge from Pond No. 4 is directed through a Parshall flume before it reaches Cement <br /> Creek. Flow rate and water quality samples are taken at the flume every week and reported to <br /> the Colorado Department of Hel dth (CDH) once a month as required by the mine's NPDES <br /> permit. The rocks just below the flume outlet and the inside walls of the flume are coated with <br /> a black precipitate. This precipitate is probably derived from the manganese in the water which <br /> is not included in the treatment equirements of the mine's NPDES permit. For the last three <br /> years since the mine has been mo itor,ng the treated discharge water from the American Tunnel, <br /> all discharge requirements have teen met except for aquatic toxicity. The reason for the failure <br /> of the aquatic toxicity test is unkl own. This is the prevailing condition throughout the Silverton <br /> Caldera including the water sup Fly for Silverton. <br /> Cement Creek is monitored for water quality and flow rate at two locations on a monthly basis <br /> pursuant to Colorado Mined LanJ Reclamation (MLR) requirements. The typical pH values at <br /> these two sites also are presente in Appendix C. <br /> sanjuan\sunny\11 0361\oct9l.Rpt 48 Rev.2/11/92 <br /> a simon 0000 o 0000 <br />