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' ' • • <br />Four sites downstream from disturbed areas along Foidel Creek were monitored <br />during 1986: Sites 33, 12, 09243800 and 2/2005. i4ining during 1986 occurred <br />in areas Si and 61. Area 51 drains into the south fork of Foidel Creek near <br />site 12, above Pond A, while Area 61 drains into Pond 0 above sites 8/2005. <br />Both monitoring sites showed large increases in dissolved solids over the <br />historic record, and both sites reflected impacts associated with different <br />phases of mining: development, blasting, leveling, teosoil replacement and <br />reveaetation, and spoils spring disr_harges. Site 8/2005 also monitors mine <br />discharge from the Foidel Creek underground mine. <br />Table 1: Foidel Creek 1986 Water Quality <br />Parameter <br />Site 74 <br />Site 12 <br />Site 8/2005 <br />Standard <br />TDS <br />693 <br />388-968 <br />1612 <br />836-2154 <br />1912 <br />1068-3138 <br />1460 <br />Fe Mn SO4 <br />1.8 0.25 359 <br />0.36-5.6 0.07-0.54 155-580 <br />1.0 0.64 733.5 <br />0.15-3.46 0.03-1.07 330-1511 <br />NO2 <br />0.002 <br />0.35 <br />0.005-2.69 <br />0.0?? <br />0.02-0.05 <br />0.05 <br />All values are presented as <br />1.5ZZ 0.45 1138 <br />0.36-6.00 0.08-0.37 605-Zi27 <br />1.0 1.0 250 <br />mean <br />min-ma;c and are measured as mo/1. <br />Total suspended solids (TSSI levels exceeded the maximum permissable <br />concentrations allowed under the discharge permit far the ponds approximately <br />once per year. The levels of exceeaarces were not greatly higher than the <br />standard and total settleable solids ~dere within the accented range. Frequent <br />exceedances in dissolved manganese concentrations v+ere observed from <br />impoundments fed by spoils springs. The manganese standard is .a secondary <br />drinking water standard whose objective is to prevent discoloration of water <br />and subsequent staining of household fixtures. The operator is working with <br />the Department of Health to re-classify the stream segment. <br />Cyprus implemented an annual spring and seep survey and monitoring plan during <br />1986 to better characterize the spoils contribution to the hydrologic system. <br />Twenty-four springs were identified and peak flows in the upper Foidel Creel <br />basin averaged 17.63 cfs while average flows during the flood irrigation <br />season (June 1 - August 31) averaged 0.87 cfs. As salinity levels stay <br />relatively consistent throughout the year, spoils contributions to the surface <br />drainage system result in river basins being very highly vulnerable to <br />salinity impacts in both the spring and late summer of low-flaw years. Flaws <br />observed during 1986 were within ranges predicted during the preparation of <br />the CHIS. <br />