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May 1999 Monthly Report <br /> Page 3 <br /> The May 1999 monitoring results for; dissolved metals in the AT-004 discharge; Cement <br /> Creek diverted for treatment (CC-1B); American Tunnel flow before treatment (AT- <br /> INFEL); and Cement Creek below the AT-004 discharge point (CC-20) are attached to <br /> this report. <br /> Mainstem Stream Monitoring and Reference Point Stream Monitoring <br /> Sunnyside sampled the reference point (A-72) on May 6, 1999. The results from this <br /> sample are attached. The Bureau of Reclamation sampled the other three gaging station <br /> (A-68, M-34 and C-48). <br /> The provisional flow on May 6, 1999 at A-72 was 125 cfs which places this sample result <br /> in the intermediate flow category(100cfs <Q<300 cfs). The dissolved zinc value for this <br /> sample, obtained by averaging the results from two labs, was 1013 ug/l. <br /> Sunnyside expedited analysis for the June samples due to the high dissolved zinc value <br /> received from the May sample. Sunnyside sampled the reference point (A-72) and the <br /> three gaging stations (A-68, M-34 and C-48) on June 9, 1999. The results from these <br /> samples are included with this report. <br /> The provisional flow on June 9, 1999 at A-72 was 1090 cfs which places this sample <br /> result in the high flow category (Q>300 cfs). The dissolved zinc value for this sample, <br /> obtained by averaging the results from two labs, was 211 ug/l. <br /> The index number for the May sample is calculated as follows: <br /> Xi = 1013 <br /> Xc = 399 <br /> Sf = 144 <br /> Ni = (Xi —Xf) /Sf <br /> Ni = (1013 —399)/144 <br /> Ni =+4.26 <br /> The index number for the June sample is calculated as follows: <br /> Xi = 211 <br /> Xc= 306 <br /> Sf = 104 <br />