1998-03-24_HYDROLOGY - M1977378 - Laserfiche WebLink

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February 1998 Monthly Report Page 2 1997 and may be related to water temperature changes. If the pH reacts the same as last year, it will start to rise around the start of summer without action by Sunnyside. Sunnyside will continue to monitor these parameters. "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 February. The entire flow of Cement Creek was diverted for treatment. The flows in February ranged from 188 G.P.M. to 229 G.P.M. Attached are February 1997, 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 February 4, 1998 as well as the other three mainstem gaging stations (A68, M34 and C48) . These results are attached. 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 584 ug/l . The index number for the February sample is calculated as follows: Xi = 584 Xf = 519 Sf = 124