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999 <br /> STATE OF COLOMDO <br /> DIVISION OF MINERALS AND GEOLOGY <br /> Department of Natural Resources <br /> 1313 Sherman St., Room 215 <br /> Denver,Colorado 80203 <br /> Phone:(303)866-3567 DENVER OFFICE <br /> FAX:(303)832-8106 <br /> PUBLIC FILE COPY NATURAL <br /> --GATE: November 11 , 1997 FILE `7 37�,.. RESOURCES <br /> SITE. •..7unnI rafit etG Roy Romer <br /> �0: Larry Perino, SGC Reclamation Manager . — y�,{ Governor <br /> James 5 Lochhead <br /> Executive Director <br /> /FROM: Wally Erickson Michael B.Long <br /> / Division Director <br /> RE: Final In ection, Longfellow Koehler Mine Waste Project MRP, <br /> CDPS Permit o. - 4 8, Consent Decree an rder, <br /> Case No. 94 CV 5459, DMG Permit No. M-77-378. <br /> Pursuant to CDPHE WQCD request, submitted 10/3/97, DMG conducted final inspection <br /> of the Longfellow Koehler Mine Waste Project MRP. <br /> Inspection Date: 10/3/97 <br /> SGC Representative: Larry Perino <br /> DMG Inspector: Wally Erickson <br /> Observations: Koehler dump material had been neutralized with high pH material and <br /> relocated to Mayflower Pond #4. Operator indicated that approximately 28,000 cy of <br /> dump material had been removed. Areas affected by removal of Koehler dump material <br /> had been covered by limestone, lime kiln dust and overburden material, graded to stable <br /> configuration which blended with natural slopes, mulched and seeded. Koehler portal <br /> shed had been reconstructed with timbers, access into portal was controlled by locked <br /> steel gate closure. Drain pipe extended from Koehler portal. Koehler portal drainage was <br /> routed to the sediment pond located between the Koehler and Longfellow sites. <br /> Longfellow shaft dump material had been graded to stable slope configuration and <br /> capped with limestone, lime kiln dust and overburden material, mulched and seeded. <br /> Final configuration of the reclaimed dump provided positive drainage, slopes appeared to <br /> be no steeper than 3H:1 V slope. Historic structures associated with Longfellow shaft <br /> remained intact, SGC personnel had reinforced one of the failing walls of the historic <br /> structure. Upland drainage had been routed around the Longfellow site by lined ditches. <br /> Upland diversion ditches were lined with PVC fabric with gravel surface layer. Diversion <br /> ditches appeared well constructed, stable and of sufficient capacity to function as <br /> intended. <br />