1998-08-17_REPORT - C1981038 (8)

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HYDROLOGY IMPACTS 1989 SURFACE WATER-EXISTING MONITORING AND IMPACTS Streams- During 1989 , seven Parshall flume and 30-day continuous recorder stations in the Terror Creek, Roatcap Creek, and Steven' s Gulch drainages were monitored. These were stream gauge Nos. SW-1, SW- 2 , SW-5, SW-6, SW-10, SW-11, and SW-12 . One crest stage gauge station (SW-4) was also monitored in the upper Terror Creek drainage. Flows in all the streams were lower than previous years especially in the late summer and fall. Zero flows were recorded in Steven' s Gulch from June through the end of monitoring in October. • Flows in the Roberts-Stucker Ditch (SW-12) and the Terror Ditch (SW-10) were regulated at the headgates on the ditches by the respective ditch companies. These flows were lower than the past years, especially in the Roberts-Stucker Ditch. Similar to past years, the pH, electroconductivity, and total dissolved solids increased during the low flows of Fall (Figures 1 & 2) . Concentrations of the major chemical ions also increased for the most part as flows decreased as could be expected. This was particularly pronounced in East Roatcap Creek. Ponds In 1988 , 44 ponds were monitored as part of the monitoring program Twenty-one of these are fed to some degree by a spring or seep in addition to runoff. Changes in chemical parameters throughout the year were dependent on amount of runoff throughout the year, amount of inflow if any from springs or seems, and the amount of evaporation. In general pond water quality had higher dissolved solids levels in 1989 than in previous years due to decreased precipitation. No evidence of impact due to mining was indicated in the 1989 data.