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HYDROLOGY IMPACTS 1987 <br />SURFACE WATER - EXISTING MONITORING AND IMPACTS <br />• <br /> <br /> <br />Streams: <br />During 1987, CWI monitored seven Parshall flume and 30-day continuous recorder <br />stations in the Terror Creek, Roatcap Creek and Steven's Gulch drainages. These <br />were stream gauges Nos. SW-1, SW-2, SW-5, SW-6, SW-10, SW-I1 and SW-12 (see Map <br />4-I). One crest stage gauge station (SW-4) was also monitored in the upper Ter- <br />ror Creek drainage. Flows and field parameters were measured monthly and sam- <br />ples were collected quarterly for laboratory analysis. CWI continues to utilize <br />the services of ACZ, Inc. for analysis of water samples. <br />Flows in the West Fork of Terror Creek (SW-1) were similar to those recorded in <br />1984 and lower than the flows of the past two years. Maximum flow occurred in <br />May. Because these monitoring stations are located north of the mine plan area <br />and the drainage area has not been undermined, the lower flows may be attributed <br />to climatic conditions rather than from mining. No change in the chemical char- <br />acteristics of the water was evident. As expected, the pH, electroconductivity, <br />hardness and total dissolved solids increased as flows decreased. Chemical pa- <br />rameters remained consistent with past years. <br />Similarly, flows in the East Fork of Terror Creek (SW-2) were lower than in past <br />years and may be attributed to climatic conditions. Field and chemical parame- <br />ters fluctuated as flows decreased and increased. <br />Flows in Steven's Gulch (SW-5) were consistent with those recorded in past <br />years. As in the other drainages, pH, electroconductivity and total dissolved <br />solids increased as flows decreased. <br />Flows in both East and Main Roatcap Creeks (SW-6 and SW-11) were also similar to <br />past years. Higher flows than in the past years in the Roatcap Creeks occurred <br />in April and May with lower flows in the months following. The early runoff may <br />be a result of a warming trend and precipitation during these months. These <br />higher flows may have also been due to greater flows diverted from Overland <br />Ditch during early runoff to relieve the Overland Reservoir which was under con- <br />struction, from rising water levels. <br />Similar to past years, the pH, electroconductivity and total dissolved solids <br />increased during the low flows of Fall. Concentrations of the major chemical <br />ions also increased for the most part as flows decreased as could be expected. <br />Flows in the Roberts-Stucker Ditch (SW-12) and the Terror Ditch (SW-10) were <br />regulated at the head gates on the ditches by the respective ditch companies. <br />These flows were similar to past years. Field parameters and chemical charac- <br />teristics were nearly the same as the originating streams. <br />Ponds: <br />In 1987, CWI monitored 27 ponds as part of the 1987 monitoring program. These <br />included Pond Nos. 81 through 89; 6-5; 7-2, 7-7, and 7-11; 8-4; 12-1, 12-2, <br />12-9, 12-10 and 12-11; 13-2, 13-4, 13-7 and 13-8; 17-1; 18-1 and 18-4; and 19-1 <br />(see Map 4-1 ). Fourteen of these are fed to some degree by a spring or seep in <br />addition Co runoff. <br />Statistical calculations of field electroconductivity, field pH, calcium, mag- <br />nesium, sodium, sulfate and total dissolved solids were compieted on eleven rep- <br />resentative ponds. These were Pond Nos. 81 through 83, 85 through 89, 13-7, <br />~,,. ~1 ~~ <br />