1998-02-23_HYDROLOGY - M1977378 - Laserfiche WebLink

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e January 1998 Monthly Report Page 2 "B List" Projects - Columbus Mine Portals -Mine Waste Dumps - London Mine Portals - Waste Dumps Work, permitting or arrangement for access is not planned until it becomes evident that the work plans for these projects require implementation. - Cement Creek Diversion and Water Treatment Cement Creek diversion and water treatment was active continuously throughout January. The entire flow of Cement Creek was diverted for treatment. The flows in January ranged from 250 G.P.M. to 375 G.P.M. Attached are December 1997, and January 1998 monitoring results for; dissolved metals in the AT-004 discharge; Cement Creek diverted for treatment (CC-1B) ; American Tunnel flow before treatment (AT-INFEL) ; and Cement Creek below the AT-004 discharge point (CC-20) . - Mainstem Stream Monitoring and Reference Point Stream Monitoring Sunnyside sampled the reference point (A-72) on January 7, 1998 . These results are attached. The Bureau of Reclamation sampled the other three mainstream gaging stations (A-68, M-34 and C-48) in January according to the alternating month schedule that is currently being followed. Sunnyside will sample these sites in February. The stream channel at A-72 was ice choked to the point that gage readings were useless. Sunnyside has estimated the flow to be less than 100 cfs and will update this estimate when the USGS completes their flow records for this site. The provisional flow being less than 100 cfs places this sample result in the low flow category (Q< 100 cfs) . The reported dissolved zinc value which is an average of the results from two labs was 586 ug/l. The index number for the January sample is calculated as follows: Xi = 586 Xf = 519 Sf = 124 Ni=(Xi-Xf)/Sf Ni=(586-519)/124 Ni= +0.54