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j ~. <br />Richard D. Lamm <br />Governor <br />,l, C~ ; ~-~ L~ v <br />~;~ 5~ovv -~% o° <br />DEPARTMENT OF NATURAL RE OURCES <br />David H. Getches~x cutive Director O ~ ~ U OU <br />MINS~D i~N~~tE~LAMATIbN DIVISION <br />DAVID~I SrH ELTO~N~D~ector ,(~`7/ OO U <br />~q- <br />i:J <br />~ September 3, 1986JLt~ ~~ / ~ ~~~ ~ ~IC ~tl <br />~ ,~,~- ~~ ~~~UOU `7C ~f-~ ADD ~-~`i'~ ~a~~ c~xrl <br />3 Mr. Jim Kiger <br />Senior Reclamation Specialist <br />Colowyo Coal Company _~li ~~,~/ <br />5731 State Highway 13 <br />~~ Meeker, Colorado 81641 <br />~~ <br />Re: Draft Preliminary Adequacy Comments on Permit Renewal Application for the <br />~ Hayden Gulch Mine - File No. C-80-003 ~~~U I <br />Dear Mr. Kiger: ~ j .,~1 <br />2 ~ <br />I have quickly perused the permit renewal application for the Hayden Gulch <br />~ ~ tdine and have some preliminary comments on hydrology-related issues. I <br />~ thought I would forward these to you to provide additional time for <br />preparation of responses. My current timetable for review of the application <br />and preparation of Findings is as follows: <br />~ Preliminary Adequacy Review September 30, 1986 <br />Deadline for Operator Response <br />~ to PAR October 31, 1986 <br />Draft Findings Document November 14, 1986 <br />CMLRD Review Deadline December 10, 1986 <br />Permit Renewal Date January 2, 1987 <br />Please let me know if you will have difficulty with any of these deadlines. <br />Comments on hydrology follow: <br />Rule 2.05.6(3) Protection of Hydrologic Balance <br />1. Please revise the probable hydrology consequences (PHC) section to <br />address spoils spring development at the mine. Develop projections about <br />the following issues using climatological and infiltration information <br />and permeability data from both the backfilled spoils and the surrounding <br />bedrock: <br />c/a. Where do you expect spoils springs to form? <br />b. How may years will it take before all the backfill areas <br />simultaneously discharge spoils water? How long will it take for the <br />high concentrations of spoils salts to be flushed from the system? 1 n/~ <br />c~~ (~ ~5 -~ ~, I <br />-~~~`k. haP~'~d Ao~ <br />423 Centennial Building3 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567 <br />III IIIIIIIIIIIIIIII <br />