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SURFACE WATER MONITORING Quarterly surface water samples for Oow and water quality were taken during April, June, August and October. METUODS During quarterly visits, flow measurements were made using aTeledyne-Gurley Model 622 current meter. Measurements were made by stretching a 100 foot tape across a surveyed cross section of the creek and utilizing the USGS six-tenths depth method. During high Oow periods when the stream canna[ be waded, the culvert width and water depth are measured. Velocity is then estimated by timing objects flowing over J a known distance. in the office, cross sections were drawn to assess changes in stream bed configuration and !lows were calculated. During samplings for water quality, measurements Cor temperature, pH and conductivity were made utilizing an Orion Research Model 399A portable pH meter and Hack Model 16300 portable conductivity meter. Prior to field sampling, meters were calibrated with known standards. All other parameters were collected in precharged bottles and submitted to Chemtech Laboratory in Salt Lake City for analyses. Methods of analyses were consistent with EPA standard testing procedures. RESULTS 1 Results of all surface water Oows and field parameters made during 1986 through 1988 are contained in Table 1. A summary of chemical parameters is presented in Appendix 1. Graphs of major chemical parameters are also included in Appendix 1. Flow data collected on Hubbard Creek (Station II-1) during 1988 indicates a high flow of 92.6 cfs during the month of April. This flow was the result of snow melt runoff in the drainage basin. Flows decreased throughout the summer to a low flow of I.50 cfs recorded in October (fable 1). This was the lowest Ilow recorded over the three year monitoring period. Snowpack and precipitation in the drainage were below normal for the year. Surface water chemistry was observed to be stable over the year and consistent within the previous two years of monitoring. The water is basically calcium-bicarbonate in nature (see Trilinear diagram in Appendix I). The cation/anion balance is low, indicating moderate hardness and ionization. As a result, sodium absorption ratio is low and the water would not pose damage to plants if used for irrigation. Metals concentrations are also within acceptable limits for all parameters tested. Mining operations at the Somerset Mine appear to have had little or no effect on quantity of Hubbard Creek. During 1988, no discharge occurred from outfall point 005 which is the discharge point from sedimentation pond #10 in the Hubbard Creek facilities area. In addition, no discharge occurred during the year in the Elk Creek Cacilities area. All NPDES forms were filed with the Department of Health during each quarterly reporting period. CMLRD also received copies of these reports during each reporting period. Quarterly sedimentation pond inspections were completed for each of the onsite ponds. Each of the four quarterly inspection reports is contained in Appendix 2. No discharges or problems were encountered during 1988.