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Requirement Regulation Comment <br /> K. Basic Standards CWQCC Surface water sites PRS 1 and PRS 4 are monitored semiannualy <br /> for Surface Water Regulation 31 see section L below: Instream Numeric Standards. <br /> New Elk Mine is subject to the water quality standards on <br /> the Arkansas River Basin, Segment 5b for the Middle Fork <br /> of the Purgatoire River. <br /> L. Instream New Elk Mine's discharges from NPDES outfalls are based <br /> Numeric CWQCC on constituents in its effluent likely to cause an <br /> Standards Regulations 32 exceedence of numeric standards. Discharges in 2019 <br /> and 2020 appeared to comply with discharge limitations <br /> set as per the NPDES permit. It is reasonable to conclude <br /> that New Elk Mine's discharges did not violate Segment <br /> 5b for the Middle Fork of the Purgatoire River instream <br /> numeric standards. <br /> Upon completion of mining,New Elk's pond network will be <br /> M. Prevention of reclaimed as they do not hold consistent water throughout the <br /> impacts to year. The post mining land use is rangeland/wildlife. <br /> surface water CDRMS No pond discharges occurred thus no exceedances of standards <br /> adversely regulation occurred in either year 2019 or 2020. <br /> impacting the 4.05.1(2) <br /> postmining land Dewatering discharge is treated before release to the <br /> use Purgatoire River. The expectation of impacts comprises an <br /> average increase in TDS downstream of the mine. <br /> N. Adequacy of CDRMS <br /> surface water regulation Adequate <br /> monitoring 4.05.13(2) <br /> program <br /> Three Refuse Disposal Area(RDA),monitoring wells(TH O1, <br /> TH 02 and TH 03),are monitored quarterly for depth of water. <br /> 0. Sampling Table 4.8-13a Groundwater wells PAW 1,PAW 8,PAW 9 and mine water <br /> frequency of of CDRMS wells New 2,New 4,NE 1-10 and New 3 are monitored <br /> groundwater mining permit semiannually. PAW 2 is a ground water well located <br /> monitoring wells C-81-010 downstream of a backfill located in a short reach of the Middle <br /> Fork of the Purgatoire River channel is a calcium bicarbonate <br /> water and is monitored semi annualy. <br /> The monitoning frequency was met. <br /> Required groundwater parameter sampling comprise: As <br /> (mg/1),HCO3 (mg/1),total B (mg/1),dissolved Ca(mg/1), <br /> P. Parameters to be Table 4.8-13 of CaCO3 (alkalinity and hardness),dissolved Cd(mg/1),Cl- <br /> groundwater t CDRMS (mg/1),total Cr(mg/1),dissolved Cu(mg/1),Fe total,dissolved <br /> er mining permit and total recoverable (mg/1),total Hg(mg/1),K(mg/1),Mg <br /> samples C-81-010 (mg/l)dissolved,Mn total and dissolved(mg/1),dissolved Na <br /> (mg/1),dissolved Se(mg/1), Sulfate,dissolved Zn(mg/1),TDS <br /> and TSS. <br /> Page 2 <br />