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September 1998 Monthly/3rd Quarter Report <br /> Page 3 <br /> Attached are September, 1998 monitoring results for; <br /> dissolved metals in the AT-004 discharge; Cement Creek <br /> diverted for treatment (CC-1B) ; American Tunnel flow <br /> before treatment (AT-INFEL) ; and Cement Creek below the <br /> AT-004 discharge point (CC-20) . <br /> Mainstem Stream Monitoring and Reference Point Stream <br /> Monitoring <br /> Sunnyside sampled the reference point (A-72) on September <br /> 9, 1998. The sample results for this sample is attached. <br /> The Bureau of Reclamation sampled the three mainstem <br /> gauging stations (A68, M34, and C48) in September. <br /> The provisional flow on September 9, 1998 at A-72 was 187 <br /> cfs which places this sample result in the intermediate <br /> flow category (100 cfs < Q < 300 cfs) . The dissolved zinc <br /> value for this sample obtained by averaging the results <br /> from two labs was 314 ug/l. <br /> The index number for the September sample is calculated as <br /> follows: <br /> Xi= 314 <br /> Xc= 399 <br /> Sf= 144 <br /> Ni= (Xi - Xf) /Sf <br /> Ni= (314 - 399) /144 <br /> Ni= -0. 590 <br /> The index number graph and updated reporting table are <br /> attached. <br /> Evaluation of the normalized data: <br /> The index value of -0. 590 for September, 1998 indicates that <br /> the dissolved zinc concentration at the reference point A-72 <br /> was significantly lower than the mean value of the data for the <br /> intermediate flow class. In comparison to the September 10, <br />