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Visual oil zinc WET (acute) <br />and grease <br />Whole Effluent Toxicity (WET) testing for Chronic Biomonitoring is required for <br />outfall 003. <br />The sewage treatment ponds (outfa11023) require analysis fot oil and <br />grease (visual), residual chlorine, pH, and flow rate weekly, plus BOD <br />(five-day), suspended solids, and fecal coliform, monthly. Total dissolved <br />solids are analyzed quarterly. Outfa11023 is exempt from WET testing <br />requirements. <br />F. Probable Hydrologic Consequences <br />Proiected Impacts <br />Section 2.05 of the permit application includes an assessment of the <br />probable hydrologic consequences of the mining operation. Those <br />consequences are summarized as: <br />1) Maximum inflow of ground water into the mines during mining will be <br />an estimated 2490 gpm. <br />2) Continued drawdown in the Middle Sandstone will be the most <br />significant impact caused by Mines 5 and 6. <br />3) About one-half squaze mile of the Twentymile Sandstone will be <br />undermined by longwall mining in the E and F seams. Impacts to the <br />Twentymile Sandstone aze very unlikely. No significant dewatering of <br />the Twentymile is expected. Twentymile water quality will not be <br />impacted. It is unlikely any open fractures will extend from the <br />longwall areas up to the Twentymile Sandstone. <br />4) Mining in the 5 and 9 Mines will not impact the only domestic well <br />near the permit azea that may be completed in the Twentymile <br />Sandstone (Lux well). <br />5) During mining, mine dewatering discharge will cause a net increase in <br />stream flow in the Williams Fork River. <br />6) Underground mining in the Eagle Mines will not directly affect ground <br />water in the Williams Fork River alluvium. <br />7) Underground entries in the Eagle Mines that are beneath alluvium will <br />not directly affect ground water in the Yampa River alluvium. <br />21 <br />