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~ ~ ,~ iii iiiiiiiiiiiiiii <br />• <br />MEMORANDUM <br />T0: <br />FROM: <br />SUBJECT: <br />February 5, 1982 <br />United States Department of the Interior <br />OFFICE OF SURFACE MINING <br />Reclamation and Enforcement <br />BROOKS TOWERS <br />1020 15TH STREET <br />DENVER, COLORADO 80202 <br />Bennett Young <br />R. T. Hurr <br />Mine Plan Review--Review of the Colorado Mined Land Reclamation <br />TEA for the McClave Canyon Mine, Garfield County, Colorado. <br />I have reviewed the subject TEA for ground-water hydrology and impacts as <br />you requested. I saw no particular problems with the State's evaluation. <br />The mine is essentially dry so there would be little or no direct effect on <br />the ground-water. Surface-water runoff has the potential of effecting <br />alluvial aquifiers downstream from the mine, but the mine plan calls for <br />containing or mitigating all runoff, so the actual effect would be negligible. <br />Stipulation 3 on mapping and measuring ground water in the mine if it is <br />encountered, seems reasonable. Stipulation 4 on monitoring wells GW-1 and \ <br />GW-4 in the alluvium of Salt Creek is also a good idea, but the quarterly <br />measurements may result in no data being collected or ong perlo s o lme <br />because of drv wells. The TEA (last sentance, p. 12) indicates that frequentl <br />the alluvium is dry. Presumedly the occurrence of water in the alluvium <br />corresponds to surface runoff events. Perhaps the monitoring schedule for <br />Stipulation 4 should allow for some flexibility to also have some monitoring <br />that_corresoonds with the runoff hydrograph or following flood events. <br />• <br />r 1 <br />L_J <br />