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;_ <br />~:- , <br />:~; °` ='°`° ., ~TATF. OF COLORADO <br />~•"`'C7.;"' nay Romer, Governor <br />DEPARTtv1ENT OF NATURAL RESOURCES ~;~~~r'~\ <br />MINED LAND RECLAMATION DIVISION ~~-~~; ,<, <br />DAVID C. SHELTO N. Director '~;\ -~'~ A .~ ~c~ <br />DATE: July 17, 1987 <br />T0: Hydrology File - Eckman Park, iaines 1 and 2, File No. C-81-071 <br />FROPi: Cathy 9egej <br />P,E: EVALIlATIO!J OF 1986 AHR - ECKMAlJ PARK COh1PLE;( - FILE PIO. C-81-071 <br />INTRODUCTION <br />IJater quality impacts at the Eckman Park Complex are observed in increased <br />levels or sulfate, TDS and manganese, and appear to be restricted to Foidel <br />Creek. iron concentrations along the entire stream exceed recommended <br />standards far aquatic life but ne correlatien exists be*_ween extant of <br />disturbed watershed and concentration. Rine 2 has had minimal impact on Fish <br />Creep. Sulfate and TDS levels increase below '4ine 2, but concentrations are <br />generally lower than ret:cmmended stanaards. <br />SURFACE !dATER <br />Foidel Creek Drain <br />Foi~iei Creek baseline is best derived from site 14, an upstream site on the <br />north fork or Foidel, The drainage has not been affected by mining. This <br />ephemeral drainage flow has historic flow ranging from 0 - 17.6 cfs with no <br />flow periods occurrina_ in late summer and mid-'sinter. The slightly alkaline <br />calcium sulfate water has a nigh hardness (x = 410 mg/1) and an average <br />salinity of 635 ma/1 TDS. Mean iron, manganese, and sulfate concentrations <br />are higher than material damage suspect levels. Total iron levels average <br />1.4 mg/1 and ranee from 0.01 - 13.80 ma/1, The aquatic life standard is 1 <br />ma/1. Total manganese leveis average O.Z ma/1 and range from 0.01 - 19.2 <br />me/l. The irrigation stcck watering level is 0.2 mg/1, Sulfate levels <br />average 280 me/i and range from 33 - 630 mg/1. <br />The opera*_or sampled at site 111, lccated in the upper reaches of the North <br />Fork or Feidel Creek thirty-four times during 1986. This site is adjacent to <br />the proposed lor_ation for the Little Middle Creek U-ponds. The analyses <br />depicted a water similar to that at site 14 downstream, but with more <br />magnesium and iron. Iron concentrations ranged from 0.49 to 5.40 mg/1 and <br />averaged 1.85 mg/1. <br />a23 Centennial Building, t313 Sherman Street Denver. Colorado 802032273 Tel. (303) 866-3567 <br />