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<br />London Mountain Clean Up <br />July 2025 <br /> <br /> <br />G2-6 <br />Colorado DRMS Station DRMS-L-5 - South Mosquito Creek midway through London Mine <br />property <br />• Water Quality Portal Direct Access: <br />https://www.waterqualitydata.us/provider/STORET/DRMS/DRMS-L-5/ <br />• Data Download URL: <br />https://www.waterqualitydata.us/data/Result/search?siteid=DRMS-L5&mimeType=csv <br />Supporting Information <br />• USGS Science In Your Watershed: https://water.usgs.gov/wsc/map_index.html <br />• EPA Surf Your Watershed: https://cfpub.epa.gov/surf/locate/index.cfm <br />• Colorado Water Quality Control Division: https://cCDPHE.colorado.gov/wqcd <br />• Colorado Division of Reclamation, Mining and Safety: https://drms.colorado.gov/ <br />Data Retrieved <br />All water quality data were downloaded on July 16, 2025, representing the most current available <br />information from each monitoring station as of that date. Regional background data from <br />unimpacted streams in the South Platte headwaters typically show zinc concentrations <0.005 <br />mg/L, cadmium <0.0001 mg/L, and lead <0.001 mg/L, emphasizing the elevated levels observed <br />in the Mosquito Creek system. <br /> <br />This appendix provides comprehensive historical water quality data analysis supporting the <br />London Mountain Clean Up 112D permit application. The data demonstrates existing <br />contamination conditions that the proposed remediation project will address. <br /> <br /> <br />