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Rule: 2.04.7 (1) (3) (4) Hydrology Ground Water <br />Hydrology descriptions and Mitigation of Impacts of Mining for the N -pit <br />redisturbance area, are not adequately described as required by Rules <br />2.04.7(1)(b) and 2.05.6(3)(a) and (b). <br />6. Please provide additional text specific to the N -pit. This should meet the <br />requirements of the above stated rules and specifically address these rules in relation <br />to anticipated drawdown due to pit dewatering, anticipated rebound of groundwater <br />elevations, affects to surrounding wells and springs, ground water quality, and <br />storage and recharge capacity. This is a redisturbed area, however the disturbance is <br />going deeper than previously mined and will create a larger volume of disturbance <br />and increased permeability. <br />Rule: 2.04.7 (2) Hvdroloov Surface Water <br />This is a review of the surface water related sections of the Hydrology Conditions <br />and includes: <br />a. Surface water flow rates. <br />b. Water quality information. <br />c. Waterbody locations and discharge into water bodies. <br />The above rule is adequately addressed. However, DRMS possesses the following <br />questions regarding TMI's newly issued NPDES discharge and monitoring <br />requirements as per CDPHE. <br />5. As some discussion is included regarding past NPDES permits, would it be <br />appropriate to discuss on revised page 4-241a the recent changes to monitoring and <br />analyte sampling put in place by CDPHE in 2018? <br />6. Please describe N Pit dewatering regime: <br />a. State where this water will be routed. <br />b. Also, please describe the routing measures to be employed, illustrating routing <br />locations and mechanisms with ditch designs, pumping regime and specifications <br />where appropriate. <br />DRMS notes that Grouse and Sage drainages have no current monitoring <br />requirements. <br />7. Please describe to what extent if any, Grouse and Sage systems will receive water <br />from disturbances associated with haul road construction or other pre mining activity <br />associated with N pit development. <br />DRMS reviewed the as build designs for the following ponds: Please see associated <br />comments and questions under Rule 2.05.3 (4) below. <br />Johnson #6 <br />Johnson #7 <br />Johnson #8 <br />Johnson #9 <br />Johnson #10 <br />Middle Pyeatt #1 <br />Middle Pyeatt #2 <br />Middle Pyeatt #3 <br />No Name #2 <br />No Name #4 <br />No Name #5 <br />Ute Pond <br />Trapper PR9 Preliminary Adequacy Prepared by: R. Reilley, GISP, M.S. Page 3 <br />Date: May 2018 <br />