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A.J. 4.'aldron February 17, 1995 Re: 1993 and 1994 Annual Hydrologic Reports and schedu:e in effect from ?}ay 1994 to the present by Technical Revision \o. 20, April 4, 1994. Decision date Piny 2, 1994, effective date Play 12, 1994, copy enclosed. In an attempt to simplify the monitoring program for the operating level at the mine, Jim Stover sent a memo to the mine Nay 5, 1994, copy enclosed. I was hired as environmental coordinator on Play 16, 1994, and we have been caorlcing to ensure compliance with the monitoring program. We have expended extraordinary effort and resources to achieve the goal of meeting the Division requirements, including hand-carrying the bulky groundwater monitoring equipment from the highway to the r-•ell sites through the snow and ice conditions in December; travelling through mud, snow, and ice on foot and breaking ice to obtain field measurements and water samples at surface water sites; snd accessing the Hubbard Creek sites on foot to make the ~reek]y inspections. ?lino, Revision Vo. 24 incorporated the concerns for ensuring continued compl.ir+uce with the monitoring program, while it also recognized there may be some conditions when monitoring is not practical. Decision date June 7, 1994, effective date June 17, 1994, copy enclosed. Even though T was successful in Navin;' Delta County make some improvement to the Hubbard Creels road during Xoc~mher, on Xovember 29 I came close to going over the erlge of the road r.hile my pickup slid backwards and sideways dor•n the slide area. When the Division was notified of this safety concern b>• letter dated Xovember 30, 1994, copy enclosed, you responded r;ith a letter dated December 30, 1994, copy enclosed. "I+'hy are the flow values for P:F-1 and \'F-2 identical but yet the cuslity values vets differe;7t^ (Sept-Dec 94)" As stated in the 159.1 Annual Hydrologic Report, page 2, copy enclosed, flow in the Xorth Porl: of the Gunnison is obtained from the USGS gauging station, located upstream from the Sanborn Creek mine near the Hao:k's \est west site. Also included in the 1994 Annual hydrologic Report was the data sheet obtained from the CSGS, copy enclosed, and the Sanborn Creek ?line discharge meter readings and flow v~_lues, to which i have added an additional column for flow in cfs, copy enclosed. ~s can be seen, the Sanborn Creek Mine discharge, the only flor,~ to enter the Sorth Fork of the Gunnison between \F-1 and \F-2, averr.ged 0.}5 cfs, with a low of 0 when the discharge was shut down for clcanin•o the mine water pond during part of the week endin; .~uoust 29, 1991, to a high avcra~e of 0.61 cfs for the week ending December 19, 1991. Compared to the forth Fork of the Gunnison, inflow from the mine is small. 8