2007-10-29_PERMIT FILE - C1981022A

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.~ EXHIBIT 2.05-E7 Monitoring Plans for Evaluation of Hydrologic Consequences - OMLLC currently maintains, and will continue, a comprehensive program to monitor surface and groundwater quality and quantity for the duration of the proposed mining and reclamation operations. The monitoring program serves as an integral pan of OMLLC's efforts to protect the hydrologic balance by providing an accurate and timely method of identifying and quantifying any possible concerns with respect to surface and ground water resources. The hydrologic monitoring plan provides for a frequency and distribution of both baseline and operational monitoring data collection adequate to identify and document baseline conditions and uends and fluctuations in the quantity and quality of surface water, the level and quality of ground water, and the overall effects of muting and reclamation activities on the hydrologic balance. Water quality parameters include field measurements for pFf, specific conductance, and temperature and laboratory measurements for general water quality characteristics such as TSB, TDB, major ions, and selected trace metals. Both surface and ground water quality samples are collected, labeled and transported to a qualified analytical laboratory for analyses. Proper sample collection, preservation, handling, and storage methods will be utilized at all times to preserve the integrity of the samples and assure the validity of the analytical results. The monitoring data and resulting evaluations are used to identify any potential problems and develop any necessarysupplexnental mitigation measures in a timelymamier. The baseline hydrologic information presented in Section 2.04.7, Hydrologic Description, of this pemut application includes identification of surface drainages and general flow characteristics; information on corresponding peak flows and annual runoff volumes; identification of ground water aquifers; and a general description of aquifer characteristics including ground water levels, movements, and recharge/discharge/storage characteristics. The baseline hydrologic information fom~s the basis and serves as a reference for the ongoing hydrologic monitoring program The operational monitoring network consists of 2 spring/seep locations, 8 ground water wells, 1 mine water discharge, and 12 stream locations summarized as follows: Site Designation Borings/Sees SP-8 SP-9 Ground Water Wells Well SG 1 Well SG3 Well BG 1 Well H-10 Well EG 14 Well EG 15 Well D2B Site Description Oliver Spring Lower Spring Rollins SS -Sanborn Creek D-Seam-Sanborn Creek Alluvium/Colluvium -Bear Creek B-Seam -Upper Hubbard Creek Alluvium/Colluvium -Elk Creek Alluvium/Colluvium -Elk Creek B-Seam -Water Transfer Well- Elk Creek Area Well D2B2 B-Seam -Water Transfer Well -Hubbard Fan Area Mine Water Discharne Outfa11015 Elk Creek Mine Discharge Streams Site G 1 Coal Gulch Site HN 1 Lower Hawks Nest Creek Site S-1 Upper Sanborn Creek Site E-1 Lower Elk Creek Site E-2 Upper Elk Creek Site B-1 Lower Bear Creek Site B-2 Mid Bear Creek Site B-3 Upper Bear Creek Site H-1 Lower Hubbard Creek Site NF-1 North Fork above Sanborn Creek Site NF-3 North Fork at Fire Mountain Headgate USGS Gage North Fork upstream of Somerset The spring/seep locations and monitoring wells are used to evaluate the occurrence of ground water, hydraulic characteristics of ground water aquifers, and fluctuations in the elevation and quality of ground MR-76 1 Revised March 2006