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<br />depicted on Map 137. The stations include: SWl-1, Stall-1, SW12-1, <br />^9V~+11-2, SW6-1, SW3?'1, SW33-1, SW23-1, SW24-1. <br />b. Five of the stations are crest stage gauges designed to measure the crest <br />of flow events and collect samples from, these events. Four stations are <br />grab sample collectors for water quality analysis only. <br />c. Crest gauge and sample collection samples will be monitored quarterly. <br />d. Surface water quality parameters include: <br />Field Measurements <br />Discharge <br />pH <br />Specific Conductance <br />Temperature <br />Laborator~Analysis <br />Ammonia <br />Bicarbonate <br />Boron <br />Calcium <br />Carbonate <br />Chloride <br />Copper, Total <br />Fluoride <br />Iron, Total <br />Lead, Total <br />Magnesium <br />Manganese, Total <br />Nickel, Total <br />Nitrate <br />Potassium <br />Selenium, Tots] <br />Sodium <br />Sulfate <br />Total Suspended Solids <br />Total Dissolved Solids <br />Total Volatile Solids <br />Sodium Adsorption Rate <br />D. Probable Hydrologic Consequences <br />The projected hydrologic impacts of mining Federal Coal Leases C-23703, <br />D-047201, C-0126669, C-8424, and C-8425 have been added to the discussion of <br />cumulative impacts for all mine-related activities. <br />1. Impact of the Mining Operation on Surface Water <br />Impacts to the hydrologic balance will occur as a result of the mine. Short- <br />term impacts which will occur as a result of surface facilities appurtenant to <br />the underground mine include reduction of water yield from the mine area to <br />the White River, increased sediment loads from disturbed areas, and water <br />quality degradation from the refuse disposal area and mine water discharge. <br />Long-term impacts will center on the effects of subsidence under Scullion <br />Gulch and Red Wash. Seethe subsidence section of this document for further <br />discussion of subsidence impacts. <br />Small, short-term surface water losses will occur as a result of two factors: <br />retention of water in ponds and removal of water from the White River <br />Lagoon. Runoff from disturbed areas will be muted through sedimentation <br />ponds, thereby reducing the amount of flow to the White River. Evaporation <br />losses will occur because the ponds will not discharge runoff until some of the <br />~;~ <br />14 <br />