Laserfiche WebLink
record is shown on Figure 4-3. The flow rates represent discharge of 692 square miles of <br />the San Juan River Basin. The Colorado Department of Health collected water quality <br />data on the Animas River to classify the stream and set water quality control standards. <br />The Department of Health sampling station was located about one half mile north of the <br />USGS gage station (Map 4-4). A summary of Animas River water quality will be found <br />on Table 4-5. <br />Spring Runoff <br />Carbon Junction Canyon drains approximately 500 acres or0.80 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 indicatesthat 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 4-6. <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 Hydrologic Reports (AHR) <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 CDRMSin 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 weresubmitted to CDRMSthrough final reclamation of the <br />mine and sediment control system. <br />Based on water monitoring, there have been no identifiable impacts to the hydrologic <br />balance as a result of the mining activity to date. As expected, surface flow has <br />dramatically responded to snowmelt runoff and large precipitation events. Otherwise, <br />Abridged Permit Document4-13Permit Renewal RN04 4/2014 <br />