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<br />June 1996 Monthly Report/2nd Quarter Report <br />Page 5 <br />Reference point monitoring (A-72) was started on June 18, 1996 <br />for Project Period monitoring. The provisional flow :based on <br />the current rating chart and USGS gaging station gage reading <br />was 515 cfs. This will put this result in the high flow <br />category ()300 cfs). The reported dissolved zinc value was <br />280 mq/1. <br />Index number calculation <br />Xi = 280 <br />Xf = 306 <br />Sf = 104 <br />Ni = (Xi - Xf)/Sf <br />Ni = (280 - 306)/104 <br />Ni = -0.25 <br />The index number graph is attached. <br />Evaluation of the normalized~rj8~a: <br />` The index value is -0.25 which would indicate that this result <br />~ was lower than the mean value of the reference data for this <br />flow class. Therefore no further evaluation or sampling is <br />required. <br />Please contact me if you have any questions or require additional <br />information, <br />a <br />'r <br />L <br />cc: EPA, Compliance Branch <br />Wally Erickson, DMG <br />_.. <br />Sincerely, <br />Larry Perino <br />Reclamation Manager <br /> <br />