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Review of 2019 Annual Hydrology Report <br /> Mine: Trapper Mine Date of review: 2021 April <br /> Permit No.: C-1981-010 DRMS reviewer: P.Lennberg(Groundwater) <br /> R.Reilley(Surface Water) <br /> Report Year: 2019 Submitted by: DRMS <br /> Date received by Division: March 19,2020 <br /> Requirement Regulation Reviewed Comment <br /> A. Filing frequency CDRMS <br /> of hydrology regulation Yes <br /> report 4.05.13(4)(c) <br /> March 15 <br /> according to The report was filed three days late.March 15,2020 was a <br /> B. Timely filing of Sections Sunday and March 19 was a Thursday. The Division date <br /> hydrology report 4.8.5.1 and Comment stamp on the report is March 19 but the letter <br /> 4.8.5.2 <br /> permit C-81- accompanying the report is dated March 16. <br /> O10 <br /> C. Filing frequency <br /> of NPDES NPDES <br /> Discharge permit CO- Yes Filing frequency was met. <br /> Monitoring 0032115 <br /> Reports <br /> D. Timely filing of NPDES <br /> Discharge permit CO- Yes Filing of reports was timely <br /> Monitoring 0032115 <br /> Reports <br /> The Trapper Mine discharged from ponds 001, 002, 0011, <br /> E. NPDES NPDES and 020 in 2019. Exceedances of TSS and total iron at <br /> discharge permit CO- outfalls 011 and 020 were noted and appeared to be in <br /> limitations 0032115 response to warming weather(Q2),that increased the rate of <br /> snowmelt,however,alternate limitations for settleable solids <br /> take precedence in spring precipitation events. <br /> F. Basic Standards CWQCC <br /> for Surface Water Regulation Comment See section G below: Instream Numeric Standards. <br /> 31 <br /> Trappers discharges from several NPDES outfalls drain to <br /> Segment 3b of the Lower Yampa River. Trapper's <br /> NPDES discharge limitations are based on constituents in <br /> G. Instream CWQCC Trappers effluent likely to cause an exceedance of <br /> Numeric Regulations Comment Segment 3b'snumeric standards. Discharges in 2019 <br /> Standards 31 and 37 appeared to comply with discharge limitations set as <br /> per the NPDES permit. It is reasonable to conclude that <br /> Trapper's discharges did not violate Segment 3b's <br /> instream numeric standards. <br /> H. Antidegradation CWCC Trapper is not subject to the Antidegradation Rule because <br /> Rule for Surface regulations 3.1. NA the receiving waters(Segment 3b of Lower Yampa River) <br /> 3.3.0 <br /> Water . and are designated"Use-Protected." <br /> L Interim Narrative CWQCC <br /> Standard for regulation Yes <br /> Ground Water 41.5.C.6 <br /> Page 1 <br />