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Recelsed DEER <br /> OFFICE <br /> June 1996 Monthly Report/2nd Quarter Report <br /> Page 5 Durango field Office <br /> Division of Unorals&Geology <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 ug/l. <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 data: <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 /> Sincerely, <br /> Larry Perino <br /> Reclamation Manager <br /> cc: EPA, Compliance Branch <br /> Wally Erickson, DMG <br />