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cu. ft. or 134,640 gallons of water. The overall retention time is <br />calculated to be 3.6 hours per pond. Assuming lime and ferric sul- <br />fate are added to the circuit, sludge builds up at the rate of 0.205 <br />tons per day (TPD) and is removed and shipped to Cotter's Mill at Canon <br />City about once every six months. However, this period of time has <br />been extended significantly due to the elimination of lime and ferric <br />sulfate additions to the circuit since October, 1976. <br />*Earthen Pond No. 1 <br />This pond is constructed of clay and crushed rock, and measures <br />125 ft. long x 50 ft. wide x 4 ft. deep for a volume of 25,000 cu. ft. <br />or 187,000 gallons. The overflow of 620 gpm from Pond 1 or ?empties <br />into this unit which provides a retention time of five hours. The pond <br />berms are approximately 4 ft. at the top. Solids buildup is at the rate <br />of 0.151 TPD. <br />*Underground Pond Storage <br />If the overflow from Earthen Pond No. 1 climbs in ppm solids, <br />this stream is diverted to two underground storage areas. Tlie total <br />volume of these areas is approximately 8300 cu. ft. or 62,000 gallons. <br />This provides an extra retention time of 1.7 hours which is <.;ufficient <br />to lower the solids content by 30Y. The ponds are old mine workings <br />or stopes enclosed on four sides by solid Precambrian rock. When <br />one area becomes inactive, another one can be employed. The~;e so- <br />called ponds are only used periodically and when in use pump; are <br />employed to transfer solutions. <br />*Earthen Pond tJo. 2 <br />The overflow from Earthen Pond i•io. 1 or the underground ponds, <br />• as the case may be, is directed into Earthen Pond No. 2. Th~s pond <br />is 100 ft. long x 60 ft. wide x 4 ft. deep and will hold 24,000 cu. ft. or <br />D-13 <br />