Laserfiche WebLink
04/13/1995 08:37 303-782-0390 1 CDH W~CD W~CC t PAGE 02 <br />r ~ ~ IIIIIIIIIIIIIIIIIII -~1~=~~~~ <br />FNndM~on MN~sIMIY <br />Poll OfAw BoY N <br />Emp6e, ColonAO 80439 <br />~~~ a~~~ fMsw ~))~ to- art or snn (3~) ses~aa2t <br />January 16, 1995 <br />Certified Mail No. Z 208 910 782 <br />Ms. Kathleen Kalamen, Enforrxment Engirrcer <br />Colorado Department of Public Health and Environment ~C~~~v~ <br />Water Quality Control Division GG~/ <br />wQCD-PE-B2 r 191995 <br />4300 Cherry Creek Drive South <br />Denver, Colorado 802220 <br />RE: CDPS Permit No. CO-0000230, Henderson Mine and MiU WHO PYttid~ <br />Dear Ms. Kalamen: <br />Currently the underground treatment system is bypassed and backup treatment. is in effect <br />on the surface as stated in the mine side process description. <br />The undcrground treatment system is iwndated with sludge due to the unexpected <br />quantity generated and delays in the receipt of capital equipment required for efficieta handling. <br />It is estimated that the system will be down for two to three months. The surface treatment <br />system works well for short periods; however, extended usage causes sludge handling problems <br />which jeopazdize the performaace of the polishing ponds. <br />Five portable 16,000 gallon tanks have been brought on site to be modified t~ clarifiers <br />to prevent the deterioration of polishing capabilities, while allowing for the additional time <br />required to bring the underground system online. These clarifiers will be located ne:R to the ~Yl <br />shaft hoist house, which contains the sodium hydroxide bulk storage tank and the heat <br />exchangers for the main intake shaft. From this facility the mine water and treatment chemicals <br />can be delivered to the temporary clarification cinnrit. <br />Enclosed is a diagram of the proposed temporary clarification circuit and an updated <br />process deseripdon. <br />Please contact me if I can be of further assistance. <br />Sincerely, <br />~~E Lt/" G~ / /- <br />Mitchell W. Lapp <br />Environmental Coordinau>r <br />Enclosures (2) <br />ce: J. Jones <br />R. Horstmann <br />