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• Blue Ribbon Mine - AHR Page 5 <br />HYDROLOGIC IMPACTS <br />The probable hydrologic consequences section of the permit, which begins on page <br />120, discusses the impact the mine might have on the quality of water in Hubbard <br />Creek. The quality of water in Hubbard Creek is influenced by run-off it receives from <br />the mine property. The mine could contribute both dissolved and suspended solids to <br />the run-off from the property. The primary potential sources of detrimental effects on <br />water quality caused by the mining operation are or were: <br />1) Increased erosion from land disturbance; <br />2) Increased oil and grease from use of machinery; and <br />3) Increased salt load due to water seeping through the mine bench which <br />was reconstructed with underground coal mine waste. <br />The erosion from land disturbance should be minimal to nonexistent because the mine <br />was reclaimed and vegetated in 1986 and sedimentation control features are in place <br />and functional. Oil and grease should not be a factor because there is little use of <br />machinery on the property. An increase in the conductivity measurements in <br />downstream Hubbard Creek would indicate an increased salt load. Enclosed is a graph <br />which presents quarterly conductivity measurements in lower Hubbard Creek from 1982 <br />through 2007. The conductivity measurements vary between 70 and 430 umhos/cm <br />but there is no indication the conductivity in downstream Hubbard Creek has increased <br />since 1982. <br />The 2007 hydrologic monitoring data indicates the hydrologic impact from the reclaimed <br />mine site is minimal to nonexistent. <br />• <br />