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• • iiiiuiiiiiiiiuiii <br />STATE OF COLORADO <br />Roy Romer, Govei <br />DEPARTMENT OF NATURAL RESOURCES <br />MINED LAND RECLAMATION DIVISION <br />DAVID C. SHELTON, Director <br />DATE: August 25, 1987 <br />T0: Jim Pendleton <br />FROM: Cathy Beget (a~~l~ ~~-) <br />RE: 1987 HYDROLOGY INSPECTIONS, TWENTYMILE PARK <br />During the 1987 F(ydrology Inspections of Twentymile Park, I tried to ascertain <br />the impact of low flows on salinity values in the stream and adjacent <br />alluvia. Snowpack in the Upper Yampa River Basin had been 40 percent below <br />average, and I expected_xhat flows would be considerably lower than normal. <br />It is too early to determine how low these flows actually will be at this <br />time. Unfortunately, on August 16, 1987, two days before we started sampling, <br />the Steamboat area received 0.5 inches of rain, and rainfall for the month is <br />running slightly above normal. Absolute low flow will probably be in early <br />September. <br />The sites presented below are ordered upstream to downstream. Foidel Creek <br />only began to flow at Site 84, the outflow of Pond D, which treats the mine <br />inflow effluent from Foidel Creek underground mine. Mine inflow effluent is <br />discharging at its peak permitted flow rate. <br />Conductivity values recorded below represent an average between those recorded <br />'by Rich Hughes (CYVCC) and ourselves. We usually differed by 200 umhos/clm2 <br />on analyses greater than 1,000 umhos/cm. Alluvial well salinity values were <br />considerably lower than those observed in the surface water, suggesting that <br />the alluvium was not being recharged by the low flow streamflow at this time. <br />We11 008-AW-3, immediately adjacent to the tipple is impacted by bond-released <br />Mine 3 spoils. This may be impacting the AVF immediately above the confluence <br />of Fish and Trout Creeks. <br />CONDUCTIVITIES IN TWENTYMILE PARK DURING 1987 MLRD HYDROLOGY INSPECTION <br /> <br />Stream Surface Water Da te Sampled Flow EC Adjacent <br /> Site (cfs) (umhos/cm) Alluv. Well <br />Trout Creek 301 8/18/87 7 536 <br />Foidel Creek 84 8/19/87 0.33 2840 001-5-5 <br /> 09243900 8/19/87 <0.22 2535 008-AV-2 <br />Middle Creek 29 8/18/87 7 2425 008-AY-1 <br />Trout Creek 69 8/20/87 ~ 20 410 <br />Fish Creek 27 8/18/87 <0.8 817 A11Series <br /> 008-AW-3 <br /> 1003 8/18/87 ! 2 1236 <br />Trout Creek Below Fish 8/20/87 < 22 475 <br /> Creek Confluence <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203-2273 Tel. (303) 888-3587 <br />EC <br />(umhos/cm) <br />1305 <br />1201 <br />644 <br />1154 <br />3080 <br />~! <br />