2005-05-23_REVISION - M1977424 - Laserfiche WebLink

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Logan Wash Mine 7R No. 6 1.0 Introduction This technical revision (TR) has been prepared to present proposed changes to the original Logan Wash Reclamation Plan (Plan), specifically with regazd to mine drainage from the Reseazch Mine portal. The original Plan was prepared in 1978 and updated in 1981. Technical Revision No. 4, submitted in February 2004, addressed multiple revisions to the Plan, including the portal closure at the Research Mine portal. Portal closure activities that occurred at the Reseazch Mine in 2003 and 2004 were considered interim measures. Activities proposed in this TR represent the final permanent action for portal closure at the mine. In interest of completing mine closure, Western Water & Land Inc., consultant for Glenn Springs Holdings, Inc., property manager for Occidental Oil Shale, Inc. (OOSI), is submitting this TR to propose a permanent mine drainage structure for the Research Mine. This technical revision describes the construction activities associated with a permanent pipeline that allows free drainage from the Research Mine to an existing natural drainage upgradient of and consistent with regulations for an existing National Pollution Discharge Elimination System (NPDES) outfall at the mine, Outfa11001. This TR presents background information in Section 2.0, construction activities in Section 3.0, and monitoring in Section 4.0. 2.0 Background Information TR No. 4 discussed the Research Mine portal and mine workings in detail and presented interim closure actions. To provide a more comprehensive report, this section provides the following excerpts of background information originally presented in TR No. 4. 2.1 General Background The Research Mine was the first underground workings to be established at the Logan Wash Mine facility. The mine tunnel was constructed on the boundary of OOSI and BLM land in the Mahogany Ledge outcrop at an elevation of approximately 7,700 ft. The portal is located immediately west of the gully forming the northeast-most head of Logan Wash (SE '/< NE Y< Sec 25, T. 7 S. R. 97 W.). The portal entrance is approximately 9-ft high and 16-ft wide. The portal is accessible by way of the main mine access road which passes over the existing Research Mine waste-rock dump. The Research Mine is the only underground working at the mine site that has discharged mine water from the portal to the ground surface. This discharge occurs seasonally and is permitted under a NPDES permit (No. COG600452) with the Colorado Department of Public Health and Environment (CDPHE). The Research Mine workings consist of two subparallel drifts with various side drifts and rooms (see Attachment A). The two drifts have separate portals that daylight on the south-facing outcrop, separated by a distance of approximately 150 fr. The drifts are joined underground by a side drift approximately 80 feet inside the east portal. The west Western Water $ Land, Inc.