REP04258 - Laserfiche WebLink

Home Browse Search

• • • Average daily flow measurements (including mean, maximum, and minimum Flows) for the five MCC gauges are summarized in Appendix A. One of the stilling wells froze in October, three in November, and one in December. Thawing began in Febtuazy, but it was mid-Mazch before all stilling wells had thawed. Nearly three months of flow information was not acquired due to sedi- ment below the flume in Sylvester Gulch. Flow data are available from the two USGS monitoring stations (these stations are on Minnesota Creek downstream of the Dry Fork, and on the North Fork of the Gun- nison River near Somerset, Colorado. The North Fork station is located approximately ~/ -mile upstream of the mine site). Because the USGS gauging stations are heated, they were unaffected by freezing temperatures. WY 1993 data for these sites are presented in Appendix B and Appendix C, respec- tively. Seasonal (three times per year, scheduled for start and peak spring runoff, and fall low flow) water samples were planned to be taken and analyzed for water quality at the eight surface water monitoring stations. Measured field parameters included pH, conductivity, temperature, dissolved oxygen, and turbidity. Samples were sent to a labo- ratory and analyzed for pH, conductivity, total dissolved solids, total suspended solids, total iron, and total manganese. In addition to these parameters from samples obtained three times each year, field water quality measurements of pH, conductivity, tempera- ture, dissolved oxygen and turbidity were taken during monthly flow measurements of the MCC stations. Testing was accom- plished by ACZ Laboratories, Inc. (Steam- boat Springs). Water analyses report are on File at the West Elk Mine. Sampling results are summarized in Appendix D. Monthly Monvoring Acrtvinrs average minimum and maximum values for the baseline monitoring period are compared with WY 1993 data for the Sylvester Gulch and North Fork Gunnison statiotu in Ap- pendix E. Spring Water Monitoring Seven established spring stations were monitored throughout WY 1993, and baseline monitoring was initiated in the third quarter of 1993 at 19 additional stations for the collection of baseline data for the Jumbo Mountain expansion. Monitoring of three springs was renewed in Lone Pine Gulch at the same time. The monitoring program for these 26 spring monitoring stations is sutmarized in Table 2. Their locations are shown on Exhibits 1 and 4. All known springs in the permit area aze shown on Map 34 in Volume 5 of the M and R Plan. Seasonal (three times per year) samples were scheduled at the seven springs. Field measurements of flow, pH, conductivity, temperature, dissolved oxygen, and turbidity, and the results of laboratory analyses for pH, conductivity, total dissolved solids, total suspended solids, iron, and manganese are presented in Appendix F. Maximum and minimum values for the baseline monitoring period are compared with WY 1993 data in Appendix E for the seven established springs. Bar graphs depicting the seven spring flows from 1979 to the present are at Appendix G. Baseline data for the nineteen new springs will be established during the monitoring period September 1993 through August 1994. MCC informally monitors USFS water resources shown in Exhibit 2. Table 3 3 Reused O<wbet 9, 4996