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~~;. • • III IIIIIIIIIIIII III 999 SNOWMASS COAL COMPANY i "~~ Mine O/lice: P.D. BOX 989 Carbontlale, Colorado 87623 (303) 963.3dd0 ~~i~ -8 1GrJ5 Denver Ollice: Suite 2300 470 Seventeenth Street ~) '."~~ ~•Cj`~ - ~ ~ T ~ r~;• I~~~ Denver, Colorado 00202 ,. .:._~., .i._ i,. ~ ,,~i01~ (3031825-1966 April 4, 1985 Mr. Robert Liddle Reclamation Specialist Colorado Mined Land Reclamation 1313 Sherman Street, Room 423 Denver, CO 80203-2273 RE: North Thompson Creek Mines Augmentation Plan Dear Mr. Liddle: As you know, Snowmass Coal Company has agreed to file an augmentation plan to mitigate any depletions to North and Middle Thompson Creeks caused by our mining operations. Snowmass has agreed to file this plan in 1985 after we have col- lected low flow data from our stream flumes. To date, Snowmass has installed the upstream and downstream recording devices on North Thompson Creek. Work will soon begin on the Middle Thompson Creek flumes so that we can begin recording flows less than 30 cfs when spring runoff subsides. Snowmass will have data from these devices for the summer and fall of 1985. Snowmass is concerned that these few months of data will not give us a complete representation of possible stream depletions. Snowmass would like to obtain data from these flumes in 1985 and 1986 before we submit a formal augmentation plan. This will allow us to obtain a more complete picture of what is happening to the stream flows in this area. Snowmass feels that this extension for filing an augmentation plan will not affect any senior water right holders because of the following reasons: 1) Since July 26, 1985, Snowmass Coal Company has temporarily ceased all mining operations. Our wash plant and longwall (two of the biggest consumptive water users) have been shut down. Approximately 200,000 GPD of water is being pumped from the mines daily to North Thompson Creek; therefore, there are no depletions of North and Middle Thompson Creeks taking place at this time. It now appears that Snowmass will be idle through 1985 and possibly through 1986. Consequently, Snowmass will continue to pump approximately 200,000 GPD of water into North Thompson Creek through 1986. 2) Snowmass has received approval from the CMLRD and the State Engineers Office to enact a temporary augmentation plan. This plan calls for the discharge of 64,800 GPD of water into North Thompson Creek. This figure was based on