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October 1998 Monthly Report <br /> Page 3 <br /> - Mainstem Stream Monitoring and Reference Point Stream <br /> Monitoring <br /> Sunnyside sampled the reference point (A-72) and the three <br /> mainstem gaging stations (A68, M34, and C48) on October 7, <br /> 1998. The results from these samples are attached. <br /> The provisional flow on October 7, 1998 at A-72 was 113 <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 401 ug/l. <br /> The index number for the October sample is calculated as <br /> follows: <br /> Xi= 401 <br /> Xc= 399 <br /> Sf= 144 <br /> Ni= (Xi - Xf) /Sf <br /> Ni= (401 - 399) /144 <br /> Ni= +0.014 <br /> The index number graph and updated reporting table are <br /> attached. <br /> Evaluation of the normalized data: <br /> The index value of +0.014 for October, 1998 indicates that the <br /> dissolved zinc concentration at the reference point A-72 was <br /> very close to the mean value of the data for the intermediate <br /> flow class. In comparison to the October 8, 1997 sample <br /> result, the 401 ug/1 is almost the same (401 ug/l verses 365 <br /> ug/1) but the flow was also significantly lower 113 cfs verses <br /> 212 cfs)which would lead to a prediction of a higher zinc <br /> concentration. <br />