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LAWRENCE G . WHITE P . E . II I III I II I II IIII III Fri Ju 1 16 1993 it :25 am Page 1 of 2 sss ,~ July 16, 1993 IAfdRF71CE 6. fRiITE P.E. lose n stllEer PtlIROSE, wI.oRADO a]249 [7191 372-G4G1 Mr. Dan Hernandez Diuision of ninerals 8 Geology 1313 Sherman Street, Room Z15 Denuer, Colorado 80203 Re: Twin Pines no. 2 Mine, Permit no. C-83-e5R: notice of Violation no. C-93-104, dated June 29, 1993 Dear Mr. Hernandez: Reference is made to subject "notice of Violation" and our telephone conuersation of July 15, 1993. I feel it is necessary to clarify some of the background and thinking in development and permitting of the spoil area. The intent was to reclaim to area that was strip mined several years ago. It was understood at that time that control of drainage from the pile during construction was difficult due to the highwall draining from aboue. It was originally proposed to construct a diversion ditch aboue the area to diuert runoff from aboue away from the pile. Rfter discussion with the Diuision it was determined that the slope aboue was too steep and rough for construction of a ditch, From that point the plan was to diuert runoff from aboue over the spoil pile to and down the access road to the bench sedimentation pond. The evidence of the apparent runoff from the pile and down the slope that you observed during your inspection occurred during the major storm event which occurred Rugust 15, 1992. (The storm and resulting damage was reported to the Diuision in my letter to Catherine Begej, dated August 24, 1992]. Rfter your inspection some grading work was done on the pile to facilitate drainage to the access road. the mine experienced a large storm event during the evening of July 14, 1993. (The storm is estimated at approximately 2" in less than an hour). The remedial work on the pile was not sufficient to preuent flow over the slope. During inspection of the site the day after the storm, it was noted that a large amount of water is being diverted into the area by an old road adjacent to the power line to the north of the pile. It appears that the road is collecting runoff from slopes to the Morth of the pile. At this time steps have been taken to force runoff from the pile to the access road by construction a ditch across the pile. Plans are being developed to begin reclamation of the down slopes, provide more positive drainage facilities, and preuent water form the old power line road from entering the pile. Rs I stated in our telephone conuersation, the future need for the spoil pile will be determined by the middle of next week and final plans can be formulated.