Laserfiche WebLink
II I I II I II I II IIII III <br /> 999 <br /> �-r STATE OF COLORADO <br /> DIVISION OF MINERALS AND GEOLOGY <br /> Department of Natural Resources <br /> 1313 Sherman St.,Room 215 �'! <br /> Denver,Colorado 80203 �4e D 1 V I S 1 O N O F <br /> Phone.(303)866-3567 'b,. ,.`.,y:� ; ..r MIN &RA L S <br /> FAX:(303)832-8106 OCT 3 J <br /> (, ' GEOLOGY <br /> Q��(!,�/� 0 9 �oo7-�-•�--�- RECLAMATION <br /> DATE: October 2, LVl7"loft%pet8%q� `; p ` 'A � MINING-SAFETY <br /> TO: LarryPerino, SGC Reclamation Manager Bill Owens <br /> g fcry Governor <br /> Andrew M. Voss, CDPHE-WQCD Greg E.Walcher <br /> Executive Director <br /> FROM: Wally Erickson rQ 101-2 MichaelDivision <br /> B.D Long <br /> Division Director <br /> RE: Project Completion Inspection Tailings Pond No. 4, Upland Groundwater <br /> Diversion Project, CDPS Permit No. CO-0044768, Consent Decree and <br /> Order, Case 94 CV 5459, Sunnyside Gold Corporation (SGC), Sunnyside <br /> Mine, DMG Permit No. M-1977-378. <br /> Pursuant to CDPHE-WQCD request, dated July 18, 2001 , DMG conducted a project <br /> completion inspection of the Upland Groundwater Diversion Project for Tailings Pond 4 at <br /> the Mayflower Mill facility. <br /> Inspection Date: May 11, 2001 <br /> SGC Representative: Larry Perino <br /> DMG Inspector: Wally Erickson <br /> Observations: Construction of approximately 1100 feet of upland groundwater <br /> intercept ditch, located along the northeast end of Tailings Pond 4, had been recently <br /> completed. The newly completed section of ditch ties into the previously constructed <br /> surface and groundwater diversion structures and extends the diversion structure across <br /> all upland areas for Tailings Pond 4. <br /> DMG previously inspected the area on October 19, 1999 and September 26, 2000. <br /> During its September 26, 2000 inspection, DMG noted that construction of the diversion <br /> ditch had been completed and that the ditch appeared to be functioning as designed. <br /> However, isolated portions of the PVC liner had been exposed by erosion of the earthen <br /> cover material. The PVC ditch liner appeared intact and not damaged by the erosion but <br /> minor grading of the cover material was necessary to ensure its stability. <br /> During the May 11, 2001 inspection, DMG observed that regrading had occurred to result <br /> in gentle slopes which blended with surrounding topography and directed upland drainage <br /> to the ditch. The PVC ditch liner was not exposed at any portion of the newly completed <br /> ditch. Subsurface drainage from upland areas was observed seeping into the ditch. Ditch <br /> flow appeared controlled by the mild gradient of the ditch and the rock/soil cover over the <br />