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Require- <br /> Require- ment <br />Requirement ment complied Comment <br /> citation with ? (yes <br /> /no <br /> Impacts have not exceeded the impacts predicted in the PHC in <br /> Table 2.05.6(3)1 of the permit application. Some of the more <br /> significant impacts that are possible are: <br /> a) Elevated suspended solids in surface runoff until the <br /> disturbed area is revegetated; <br /> b) Permanent depression of the potentiometric surfaces of the <br /> mined stratigraphic units within and near the pits; <br /> c) Continual formation over a few hundred years of a salty <br /> leachate in the spoil-filled pits as meteoric and irrigation <br />X. Agreement CDMG waters infiltrate the spoil; <br />of observed regulation d) Discharge of the spoil leachate into permeable sandstone <br />hydrologic 2.05.6(2) layers that are in contact with spoil in the low-walls of the <br />impacts with and pits, <br />"probable requireme e) Bedrock invaded by leachate will have minimal change in <br />hydrologic nt to keep yes ground water quality because leachate (after dilution by <br />consequences informatio infiltrating irrigation water) will be similar in quality to <br />" (PHC) n current, pre-mining ground water quality(TDS around 2000 mg/I); <br />projected in CDMG f) Migration of the leachate through bedrock at a rate on the <br />mining regulation order of 0.2 ft per day, <br />permit 2.03.3(1) g) Discharge of the spoil leachate (at a rate of several gallons <br /> per minute) to Calamity Gulch via a spoil spring that may <br /> form in SWI/4- Sec. 36-47N-16W); <br /> h) No detrimental impact to ground water flow rate or aquifer <br /> recharge rate; <br /> i) No impact to the azea's most attractive bedrock aquifer , <br /> the underlying Burro Canyon formation, because of <br /> intervening shale beds that are an aquitard. <br /> Existing monitoring appears adequate. Ground water <br />Y. Adequacy monitoring wells are positioned to intercept leachate flow at the <br />of ground CDMG two locations most likely to be in the leachate flow path, should <br />water 'regulation yes leachate migrate down-gradient from the pits after the pits are <br />monitoring 4.05.13(1) reclaimed. These wells (GW-N44,45,46, and GW-N 16, 17, 18) <br />program are completed in stratigraphic units above, below, and within the <br /> mined coal beds in the Dakota formation. <br />Z. Adequacy of CDMG Existing monitoring appears adequate. Instream monitoring is <br />surface water <br />regulation <br />es conducted downstream from the mining operation on both <br />monitoring <br />4.05.13(2) y streams in the area, Tuttle and Calamity draws. The mine's <br />ro ram dischaz es to those streams are monitored at NPDES outfalls. <br />Page 5 <br />