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February Monthly Report <br /> Page 3 <br /> The February 1999 monitoring results for; dissolved metals <br /> in the AT-004 discharge; Cement Creek diverted for <br /> treatment (CC-1B) ; American Tunnel flow before treatment <br /> (AT-INFEL) ; and Cement Creek below the AT-004 discharge <br /> point (CC-20) are attached to this report. <br /> Mainstem Stream Monitoring and Reference Point Stream <br /> Monitoring <br /> Sunnyside sampled the reference point (A-72) and the <br /> mainstem gaging stations (A68, M34, and C48) on February <br /> 4, 1999. The results from these samples are attached. <br /> The provisional flow on February 4, 1999 at A-72 was <100 <br /> cfs which places this sample result in the low flow <br /> category (Q<100 cfs) . Ice in the channel had built to the <br /> point that gage readings were inaccurate. The dissolved <br /> zinc value for this sample, obtained by averaging the <br /> results from two labs, was 650 ug/l. <br /> The index number for the February sample is calculated as <br /> follows: <br /> Xi= 650 <br /> Xc= 519 <br /> Sf= 124 <br /> Ni= (Xi - Xf) /Sf <br /> Ni= (650 - 519) /124 <br /> Ni= +1. 06 <br /> The index number graph and updated reporting table are <br /> attached. <br /> Evaluation of the normalized data: <br /> The index value of +1. 06 for February, 1999 indicates that the <br /> dissolved zinc concentration at the reference point A-72 was <br /> significantly higher than the mean value of the data for the <br />