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j � <br /> Cri" ha <br /> November 22,2022 <br /> Jacob Dyste <br /> Enforcement Specialist <br /> Clean Water Compliance 8 Enforcement Section <br /> Water Quality Control Division <br /> Colorado Department of Public Health and Environment <br /> 4300 Cherry Creek Drive South <br /> Denver.CO 80246 <br /> Re: October 2022 Sample Results <br /> London Mine Water Tunnel,Permit No.CO-0038334 <br /> Dear Mr.Dyste. <br /> Pursuant to the Consent Order which became effective on November 22, 2016, MineWater <br /> presents electronically to the Division results from the monthly sampling of the receiving water <br /> downstream of the London Mine Site(Site),at SMC003,the concentrations of arsenic,cadmium, <br /> copper,lead,silver,and zinc. <br /> 30-day 30-day Ocher 2016(ug/L) <br /> Average Averege <br /> AnaW C00038334 SMC003 C00038334 SMC003 <br /> pH(su) 7.70 8.44 <br /> As,PD( L) RL< 1.0 RL< 1.0 1.7 1.0 <br /> Cd,PD u L RL<0.5 0.81 8.2 3.0 <br /> Cu,PD u L) 2.0 1.9 55 21 <br /> Pb,PD( /L) RL<0.5 RL<0.5 2.0 1.2 <br /> PD /L RL<0.5 RL<0.5 0.025 0.200 <br /> Zn,PD L) 258 200 2,600 890 <br /> Hardness(CaCO3)1 250 180 <br /> The water samples were collected on 10/05/2022,10/13/2022,10/19/2022,and 10/25/2022. <br /> Note that,for example,the creek flow at SMC003 was 890 ppb zinc in October 2016, compared to 180 <br /> ppb this past October 2022. <br /> The demonstrated efficacy of our work for the past 7 years is evidence of the effectiveness of the <br /> Compliance Order on Consent/Settlement Agreement,the full implementation of which is functionally <br /> the Environmental Protection Plan for the Site. <br /> (a) <br /> This segment of South Mosquito Creek is numbered as 2c, in Regulation#38 Stream Classifications and <br /> Stream Standards of the CDPHE Adopted Rules. Uses of the water in South Mosquito Creek, are defined <br /> as Agriculture,Aquatic Life Cold 1, and Recreation E. See the following table from Regulation#38. <br />