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iii iiiiiiiiiiiuiii <br />999 <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1713 Sherman St., Room 215 <br />Denver, CO 80203 <br />Phone: (3031 866-3567 <br />FAX: (3031832-8106 <br />January 21, 1993 <br />TO: Susan Morrison ,. '~' <br />FM: Shawn Smithy ~ ~ <br />Re: PAR Review of Hydrology data in TR 26 <br />Seneca II Mine (C-80-005) <br />OF COr_ <br />ti`s'. ~ `O*~ <br />H <br />~~~~ <br />Roy Romer <br />Governor <br />Michael B. LOnR <br />Division Director <br />This is the second comment on PAR issues addressed in TR 26 <br />concerning hydrology concerns that were itemized on a memo dated <br />1/15/93. <br />From our joint discussion on the best way to approach the newly <br />submitted hydrological data from 1986 to 1992, most of the concerns <br />noted on 1/15/93's memo are a moot issue should you recommend that <br />the information submitted be inserted into the permit with a new <br />PHC. This would not entail a rewrite of the original PHC as <br />previously assumed to bring the current data up to date. <br />Therefore, there remain only two issues of the original memo. <br />These are: <br />1. That a separate and newly organized PHC be drafted that <br />incorporates the following: <br />- Trends noted over the past 10 years of mining in both <br />surface and ground water wells be made to encompass a <br />historical record of past and present observations; <br />- That based on the above, predictions as to future <br />scenarios be made; especially with regard to TDS; <br />- All new data from 1986 to 1992 be referenced as a source <br />of information somewhere in the original PHC, preferably <br />at the beginning. <br />2. Regarding Cow Camp Creek; an explanation be provided that <br />explains why TDS levels are higher in downstream well GW-S69 <br />than in GW-S46 despite low alluvial aquifer transmissivity. <br />The trend shows GW-S69 to be increasing while GW-546 is <br />decreasing since 1986, despite spoils spring #5 with a TDS <br />high of 14,600 being upstream from GW-546. <br />The results are contrary to mine impact, since Pond 004 which <br />discharges into the vicinity of GW-S46 should be impacting GW- <br />546 with higher TDS levels than GW-S69 which is downstream. <br />phcsenca <br />