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<br />London Mountain Clean Up <br />July 2025 <br /> <br /> <br />G2-5 <br />Representativeness <br />Hydrologic Conditions: The limited number of sampling events (3 per station for Colorado <br />agencies) may not capture the full range of hydrologic conditions that affect metals transport. <br />However, the sampling does represent different seasonal conditions and flow regimes typical of <br />the high-elevation environment. <br />Spatial Coverage: The three-station network provides good spatial coverage from upstream <br />baseline conditions (USGS), through the primary contamination source (DRMS on-site), to <br />downstream impact assessment (CDPHE). This configuration allows for source attribution and <br />impact assessment, making the dataset highly relevant for remediation planning despite <br />temporal limitations. <br /> <br />6. Data Sources and References <br />Water Quality Data Portals <br />EPA Water Quality Portal: https://www.waterqualitydata.us/ <br />• Primary portal for accessing water quality data from multiple agencies <br />• Used for downloading data from all three monitoring stations <br />USGS Station 06693800 - Mosquito Creek Near Alma, CO <br />• USGS Water Data for the Nation: https://waterdata.usgs.gov/monitoring- <br />location/06693800/ <br />• USGS Water Services API: https://waterservices.usgs.gov/nwis/site/? <br />format=rdb&sites=06693800&agencyCd=USGS&siteOutput=expanded&siteStatus=all <br />• Water Quality Portal Station Page: <br />https://www.waterqualitydata.us/provider/NWIS/USGSCO/USGS-06693800/ <br />CDPHE Station 21COL001_WQX-5988A5 - Mosquito Creek D/S N. London Mine <br />• Water Quality Portal Direct Access: <br />https://www.waterqualitydata.us/provider/STORET/21COL001_WQX/21COL001_WQX <br />-5988A5/ <br />• Data Download URL: https://www.waterqualitydata.us/data/Result/search? <br />siteid=21COL001_WQX-5988A5&mimeType=csv