2007-11-07_HYDROLOGY - M1977300 - Laserfiche WebLink

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Schwartzwalder Kline -Hydrologic Evaluation of Mine Closure and Reclamation 14 45.00 40 00 i . ~ - 35.00 - - 30.00 _ _ ~ - V k+ 25,00 - - - - 3 20.00 - - - - _~ _ . o ~ LL - - 1s.oo - - - _ - - - - -- ~- - ~ 10.00 -- - 1 _~ , s oo - - - - - ,. ~ ., SWUP SW-UC SW-A001 SW-BDIS SW-PL SW-OS SW-BOS SWGS SW-BPL ~ Od-98 t 74 2 33 1.70 2.34 2 08 4.37 2.03 2.71 2 54 -~ Nov-98 . 2 23 2.96 I 2.22 1 98 6.26 2 01 4 95 3 99 Dec-98 t 70 2.09 2.32 ~ 2 53 d 37 1 99 _ 3 16 2.47 - ~- Jan-99 t 64 ~ 3.20 2.96 2.34 3 18 2127 1 83 5 40 3 99 ~- Feh-99 3 47 2,09 6.10 2 09 1.98 _ 5.75 - 1 87 5 04 3 99 t Mar-99 , 3 47 320 12 38 - 4 97 3.16 21.27 ~ 2.01 5 85 5 80 + qpr-99 16 70 19 72 15 51 - 9.45 34 59 3 10 29 a0 10 67 -~ May99 , 31 47 22.04 35 09 36 00 34 14 38 58 33.32 3 t 36 32 95 -Jul-99 2,89 8 42 1 59 6.66 8 55 6.32 4 66 ~ 6 21 6.53 - Aug-99 16 70 i 16 24 2244 t6 56 17 50 19.41 - 5.81 t 5 70 Sep-99 6 34 13 63 12 38 10 24 8 55 27 93 1 08 7 64 9 08 Figure 8. Flow Rates Measured in Ralston Creek near the Schwartzwalder Mine, by Station, 1998 - 1999 The following observations are made based on the flows measured at gaging stations near the mine and above Ralston Reservoir from October 1998 to September 1999: • Flow in Ralston Creek is relatively constant (within the precision of the measurements) from above the mine (station SW-UC) to below the mine property (station SW'-fiPl.), indicating that the measured reaches are neither gaining nor losing. No large catchments are tributary to Ralston Creek within this stretch. The discharge from the water treatment plant to the creek during the study period averaged ' I ~ gpm (0.-17 cts). which is within the precision of the measurements. The added flow from the treatment plant discharge is not manifested as an increase in measured tlows between stations SW-A001 and SW- BDIS. • The rating curve developed for station SW-OS appears to slightly overestimate tlows during low Clow (~ - i cts) and high Clow (35 cfs) periods. The rating curve overestimates are even greater during intermediate tlow periods (6 - 30 cts) at station SW-OS. However, when evaluated in combination, the flow measurements and rating curves (Appendix A) from all nine stations provide a reasonably accurate assessment of flow in Ralston Creek near the mine site. • I"he stream flow in Ralston Creek was below normal during the monitoring period. The daily Clow data measured by Denver Water was less than the monthly average during I 1 of the I _' gaging events ("fable J I !19 R.07 I I l ~, Whetstone Associates •