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4th Quarter/December Monthly Report <br /> Page 4 <br /> The November and December, 1998 monitoring results for; <br /> dissolved metals in the AT-004 discharge; Cement Creek <br /> diverted for treatment (CC-1B) ; American Tunnel flow before <br /> treatment (AT-INFEL) ; and Cement Creek below the AT-004 <br /> discharge 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 December <br /> 2 , 1998. The results from these samples are attached. <br /> The provisional flow on December 2, 1998 at A-72 was 95 <br /> cfs which places this sample result in the low flow <br /> category (Q<100 cfs) . The dissolved zinc value for this <br /> sample obtained by averaging the results from two labs was <br /> 571 ug/l. <br /> The index number for the November sample is calculated as <br /> follows: <br /> Xi= 571 <br /> Xc= 519 <br /> Sf= 124 <br /> Ni= (Xi - Xf) /Sf <br /> Ni= (571 - 519) /124 <br /> Ni= +0.42 <br /> The index number graph and updated reporting table are <br /> attached. <br /> Please note that in the November, 1998 report the index number <br /> calculation shows a value of +0. 089. This is in error, the <br /> value should have been +0.89. The index number graph and <br /> reporting table were correct. <br /> Evaluation of the normalized data: <br /> The index value of +0.42 for December, 1998 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 />