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999 STATE OF COLORADO DIVISION OF MINERALS AND GEOLOGY Depanmem of Natural Resources 111 3 Sherman SL, Room 215 Denver, Colorado 80203 Phone: (303) 866-3567 Fr%% U03) 832-8106 Date: March 7, 1995 To: Randy Price From: Dan Hernandez~\~ Re: Febniary 27, 1995 Memo Basin Resources, Inc., The Golden Eagle Mine, Permit No. C-81-013 ~~ ~~~~ DEPARTMENT OF NATURAL RESOURCES Roy Romer Governor )amen 5. Lochhead E>.ecutive Duector Michael B Long Drvrsion Director Thanks for your "protocol" memo of February 27, 1995 regarding the investigation of the Tatum stock watering well. I have just a few questions. 1. On the first page, you discuss a seep that was identified at a location 187 feet upslope and to the northwest of the windmill. You stated that "the seep is probably representative of perched aquifers that are common and complicate the groundwater regime." As more and more people move into the Rancho Escondido area, the idea of perched aquifers will no doubt come up again as these folks consider drilling water wells. Could you let me know what our basis is for concluding that perched aquifers are common in the Golden Eagle Mine area? It would really help me out. Thanks. 2. On the second page of the memo, you conclude that using a 29° angle of draw, subsidence would stop at about 300 feet away from the well, and that if a 39° angle of draw were used, subsidence would stop at about 130 feet away from the well. Could you let me know what map was used to determine the horizontal distance between the Tatum well and the longwall panel? Thanks. Also, was the figure for the depth the one that Ralph Lopez provided us? 3. On the second page, it is stated that "the water level in the well is still above the level of the Purgatoire River. This indicates that the river is a gaining (reach?) in this area." I need a little help understanding something here. If the Tatum well were completed in a "perched" aquifer, would this mean the water level in that aquifer would be "perched" above the river's water level? Also, if a well is completed in a perched aquifer, how can the water level in the well be used as an indicator of whether the river is gaining or losing? 4. I had a question with regard to the paragraph discussing the water level in the well and the cone of depression from the mine workings. If the river is "gaming," is any water from the river being drawn back toward the mine? If it is, does this mean the river is "losing"? If the Tatum aquifer is in communication with the river, is it possible that the drawdown from