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confluence of Carbon. Junction Canyon with the Animas River (Map 4 -4, Regional <br />Hydrology Map). Mean monthly discharge of the Animas River for the last 30 years of <br />record is shown on Figure 4 -3 The flow rates represent <br />discharge of 692 square miles of the San Juan River Basin. The Colorado Department of <br />Health collected water quality data on the Animas River to classify the stream and set <br />water quality control standards. The Department of Health sampling station was located <br />about one half mile north of the USGS gage station (Map 4 -4). A summary of Animas <br />River water quality will be found on Table 4 -5 t&A4W+M} <br />Spring Runoff <br />Carbon Junction Canyon drains approximately 500 acres or 0.80 square miles of surface. <br />Surface water flow in Carbon Junction Canyon is ephemeral, and flows occur in response <br />to snowmelt and high intensity and/or duration precipitation events. During summer and <br />fall months surface flow is only observed following significant precipitation events. <br />Table 4 -5a contains 1981 flow data. Flow varied from 0.0 to 1.9 gpm. A significant <br />precipitation event occurred on September 13, 1982. A sample of water was taken from <br />the only location still exhibiting sufficient flow ( <1.0 gpm) on September 15, 1982 (Map <br />4 -3). The results of water quality testing are shown on Table 4 -7�. <br />A spring and seep inventory was conducted using aerial photos, water rights information <br />and a field survey. The results of the inventory are shown on Map 4 -3. Spring No. 1 <br />(C.J. Canyon Up) flowed at 5 gpm on September 17, 1982, 5 days after a precipitation <br />event. Spring No. 1 was dry on October 8, 1982 which indicates _that this spring flows in <br />response to precipitation events. On October 8, 1982, samples of Spring No. 3 (REA <br />SPG #3) and Spring No. 4 (CJ -LO -SPG #4) were collected. Results of water quality <br />testing are shown in Table 4- 609eirib* it). <br />Spring No. 3 (REA SPG #3) and Spring No. 4 (CJ -LO -SPG #4) exhibit relatively poor <br />water quality. The electrical conductivity and total dissolved solids concentrations are <br />high on a comparative basis. The sulfate concentrations are also high. The "high" <br />relationship referred to above is on a comparative basis to potable water. <br />Annual HydroloLde Reports LAHR) <br />Oakridge Energy continued surface and groundwater monitoring under the approved <br />monitoring program. In 1996, a complete compilation and summary of water monitoring <br />data was provided to CDRMS in the Carbon Junction. Mine (C -92 -080) Annual <br />Hydrologic Report, 1995 Water Year. Subsequent Annual Hydrologic Reports were <br />prepared and submitted to CDRMS. In 2006, the water monitoring program for the <br />Carbon Junction Mine was terminated with the approval of the CDRMS. Annual <br />Hydrologic Reports addressing the status and inspection of the sediment control system <br />and discharge from the ponds were submitted to CDRMS through final reclamation of <br />the mine and sediment control system. <br />Abridged Permit Document 4 -13 Feb 2013 Permit Renewal <br />