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NPDES Discharge Sites <br />1. Sites are monitored under the appropriate NPDES discharge <br />permit. <br />Mine Inflow Monitoring <br />1. What is the period for the units million gallons/period? <br />2. Figure 92 is not mine inflow results as specified in the <br />text. <br />3. Past reports have made comparisons between total mine <br />inflows and mine water discharge. Some totaling of mine <br />inflows and mine water discharge should be made, similar <br />to a mine water balance analysis. <br />4. What is the significance of points numbered 9-19 on the <br />mine inflow map? Are points 1-8 missing from the map? <br />Water Ouantitv and Quality <br />Bedrock Wells <br />1. Field pH values are abnormally high for 91M006, <br />91M001, 91M004, 006-BRDH7, 91M005, and 001-83-107 <br />for the 1995 water year. Please explain these - <br />unusually high pH values. - <br />(1994 AHR review comments are included in italics for <br />reference only) <br />1994 comments <br />1. Water levels in the Wadqe overburden in FBRIlA, which is <br />located some 10,000 feet from the subsided area, shows a <br />water level decline of approximately 60 feet starting in <br />1992. At 800 feet from the subsided area at well 91M006, <br />the water level decline is approximate 275 feet. A <br />decrease in TDS in well 91M006 is also noted, possibly <br />due to a gradient reversal due to adjacent underground <br />mining and subsidence. Observed drawdown is within the <br />range predicted in the Probable Hydrologic Consequences <br />(PHC) portion of the approved permit. <br />1995 comments <br />1. The water level in Wadge well FBR-11A has risen to new <br />maximum levels for the period of record. The water level <br />in well 91M006 has not yet recovered, but the declining <br />water level trend appears to have ceased. TDS levels <br />continue to decline slightly from 1994 values. <br />1994 comments <br />