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1st Quarter and March 1999 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) on March 3 , <br /> 1999. The results from this sample are attached. <br /> The provisional flow on March 3, 1999 at A-72 was 64 cfs <br /> which places this sample result in the low flow category <br /> (Q<100 cfs) . The dissolved zinc value for this sample, <br /> obtained by averaging the results from two labs, was 717 <br /> ug/l. <br /> The index number for the March sample is calculated as follows: <br /> Xi= 717 <br /> Xc= 519 <br /> Sf= 124 <br /> Ni= (Xi - Xf) /Sf <br /> Ni= (717 - 519) /124 <br /> Ni= +1. 60 <br /> The index number graph and updated reporting table are <br /> attached. <br /> Evaluation of the normalized data: <br /> The index value of +1.60 for March, 1999 indicates that the <br /> dissolved zinc concentration at the reference point A-72 was <br /> significantly higher than the mean value of the reference data <br />