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drainage from the waste dump and test whether the discharge was amenable to passive <br />treatment in 1996. <br />It was determined that the metal concentration was too high to economically operate and <br />maintain a passive treatment system. The timber sets that were installed in 1996 will <br />require inspection and movement or burial of the sill spreaders to allow access for <br />construction. It is also known that a cave exists within the tunnel that may require passage <br />tlvough if an acceptable plug site does not exist out-bye of the cave. <br />Identification of Lands <br />The Koehler Tunnel is located at the headwaters of Mineral Creek just off of Highway <br />550 near the summit of Red Mountain Pass in San Juan County, Colorado. See attached <br />location map. <br />Identification of the Waters of [he United States Potentially Affected <br />The headwaters of Mineral Creek, Segment 8 of the Upper Animas River Basin. <br />2. Location Man <br />Attached <br />3. Stormwater Management Controls <br />Sediment catclunents will be installed as needed. The majority of this project's activity . <br />will be underground. <br />Inspection and Record Keeping <br />The Reclamation Manager or a member of the Technical Services Department from SGC <br />will inspect this project on a regular basis until project completion. Quarterly reports <br />with photographs will be submitted by the remediating party to both the Water Quality <br />Control Division ("Divisiou") and the Colorado Division of Minerals and Geology <br />("DMG"). Photographs of the property prior to remediation will be submitted with the <br />first quarterly report. <br />Monitoring <br />Additional monitoring for this project is not contemplated. SGC and/or the Bureau of <br />Reclamation ("BOR") monitors Mineral Creek at the USGS gaging station (M-34) above <br />the confluence with the ,Animas River monthly. SGC will maintain this monitoring <br />station until released from this requirement. BOR monitoring data will adequately <br />characterize changes to Mineral Creek after SGC is released from this monitoring <br />requirement. <br />Reporting <br />The design will be submitted in an acceptable form to the Division. The Division will <br />approve the design prior to construction of the plug. This is not a long-term project. <br />231'115.2 December 3, 2002 B - 3 <br />