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• Sanborn Creek Mine 1995 Annual Hydrologic Report <br />The conclusions of the study are that the Sanborn Creek Mine has a <br />minimal effect on stream macroinvertebrates in general, that the <br />discharge has little, if any, effect on the overall food base for <br />fish, and that the use of the river for fishing has not been <br />impaired. Somerset Mining Company agreed, and Oxbow Carbon & <br />Minerals, Inc. agrees with the conclusions of the report. <br />Further, as a result of the report, additional "WET" testing <br />following the report, and a record of compliance during routine <br />testing, the CDPS discharge permit was amended. Monitoring <br />frequency has been reduced, and the "WET" test is now required for <br />fathead minnows only. <br />Spring monitoring points SP-1 through SP-11 are designed to monitor <br />the springs and correlate the data with the prior monitoring data <br />presented on pages 2.04-29vii through 2.04-29xvii of the permit <br />document. One year prior to retreat mining under Springs 1 through <br />6, monitoring will recommence and the data will be interpreted and <br />correlated. A significant change in the quality or quantity of <br />flow from the springs after retreat mining would indicate that the <br />mine may be having an impact on the springs. Springs 1 through 6 <br />are located above the mine workings and are separated from the mine <br />by over 2,000 feet of overburden. <br />The spring monitoring data, Springs 1 through 11, interpretation <br />• and correlation with past monitoring was submitted with the 1992, <br />1993, and with the 1994 annual hydrologic reports. No mining will <br />be performed within the angle of draw of Springs 1 through 6 or <br />Springs 10 and 11 until the baseline monitoring and interpretation <br />of the data is complete and approved by the Division. Baseline <br />monitoring was completed in June 1994. Interpretation and <br />correlation of the data was submitted to the Division on September <br />ISr 1994: <br />Springs 1-6 have continued to be monitored pending approval of the <br />report by the Division. Weather and road conditions prevented <br />monitoring Springs 1-6 in April, and Springs 4 & 5 in May. 1995 <br />monitoring data for Springs 1-11 are included in this report. <br />When the present spring monitoring was begun in June 1993, effort <br />was made to locate the springs as marked on the Monitoring Location <br />Map from Western Slope Carbon Hawk's Nest Mine included in the <br />permit documents as page 2.04-SOxviii. The legend indicates the <br />marking to be Approximate Spring Location. Actual monitoring <br />locations have been marked on the ground, and monitored at the same <br />locations since. <br />Spring 1 is a depression near a grove of aspen trees. The <br />depression may have contained water when it was monitored previous <br />to 1993. Data have not recorded a flow. The other field <br />6 <br />C~ <br />