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iii iiiiiiiiiiii STATE OF CUI.Ui~O Roy Romer, Gove~ DEPARTMENT OF NATURAL RESOURCES MINED LAND RECLAMATION DIVISION FRED R. BANTA, Dlreetor GATE: August 9, 1989 T0: Tony Waldron f1 \~ FROM: Bi I1 CricK ~~~ M~ RE: Colowyo (C-81-019) Request for Minor Revision to I~od:i-fy Ground Water s Plblti_tDrin~ of Goodspring CreelgAlluvium ~ Colowyo proposed to replace existing wells 66005 and 6600N, located just upstream and downstream respectively from the Streeter fill, with new monitoring points in the Goodspring Creels alluvium. The new upstream well is existing well A-3, in the southeastern corner of the permit area, and they plan to install a new well about 1,200 feet downstream of 6600N. There will be no change to the monitoring frequency or parameters list, so the longer review and public comment period associated with a Technical Revision are probably not necessary. I agree witn the statement in the revision that samples from well 66005 may no longer be representative of undisturbed conditions, as it is located downgradient from Gulch A and discharge point 004. Well A-3 is located as far upgradient as is possible in Colowyo's permit area. There is baseline water quality data available for A-3, and it appears very similar to that of samples from 66005. The proposed new well would be near the downstream limit of the permit boundary, and should serve quite well as a downgradient monitoring point. It would be more representative of ground water leaving the permit area than is well 6600N. The revision does not address whether the existing monitoring wells will be left in or reclaimed. It would be advisable to leave them in at least until it is clear that the new wells are yielding representative samples. /en cc: Jim Stevens 8777E 215 Centennial Building, 1313 Sherman Street Denver, Colorado 80203-2273 Tel. (303) 866.3567