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2007-11-07_HYDROLOGY - M1977300
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2007-11-07_HYDROLOGY - M1977300
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Last modified
8/24/2016 3:18:19 PM
Creation date
12/3/2007 4:13:29 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1977300
IBM Index Class Name
HYDROLOGY
Doc Date
11/7/2007
Doc Name
Hydrologic evaluation of mine closure & reclamation
From
Whetstone Associates
To
Cotter Corpoartion
Media Type
D
Archive
No
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Schwartzwalder Kline -Hydrologic Evaluation of Mine Closure and Reclamation 14 <br />45.00 <br /> <br />40 <br />00 i <br />. ~ - <br />35.00 - - <br />30.00 _ _ <br />~ - <br />V <br />k+ 25,00 - - <br /> - - <br /> <br />3 <br />20.00 - - - - _~ _ . <br />o ~ <br /> <br />LL - - <br />1s.oo - - - _ - - <br />- <br />- -- <br />~- - <br />~ <br /> <br />10.00 <br />-- <br />- 1 <br />_~ , <br />s oo - - - - <br /> <br />- ,. <br /> ~ ., <br /> SWUP SW-UC SW-A001 SW-BDIS SW-PL SW-OS SW-BOS SWGS SW-BPL <br />~ Od-98 t 74 2 33 1.70 2.34 2 08 4.37 2.03 2.71 2 54 <br />-~ Nov-98 . 2 23 2.96 I 2.22 1 98 6.26 2 01 4 95 3 99 <br />Dec-98 t 70 2.09 2.32 <br />~ 2 53 d 37 1 99 _ <br />3 16 2.47 <br />- ~- Jan-99 t 64 ~ 3.20 2.96 2.34 3 18 2127 1 83 5 40 3 99 <br />~- Feh-99 3 47 2,09 6.10 2 09 1.98 _ 5.75 - <br />1 87 5 04 3 99 <br />t Mar-99 , 3 47 320 12 38 - 4 97 3.16 21.27 ~ 2.01 5 85 5 80 <br />+ qpr-99 16 70 19 72 15 51 - 9.45 34 59 3 10 29 a0 10 67 <br />-~ May99 , 31 47 22.04 35 09 36 00 34 14 38 58 33.32 3 t 36 32 95 <br />-Jul-99 2,89 8 42 1 59 6.66 8 55 6.32 4 66 ~ 6 21 6.53 <br />- Aug-99 16 70 i 16 24 2244 t6 56 17 50 19.41 - 5.81 t 5 70 <br />Sep-99 6 34 13 63 12 38 10 24 8 55 27 93 1 08 7 64 9 08 <br />Figure 8. Flow Rates Measured in Ralston Creek near the Schwartzwalder Mine, by <br /> Station, 1998 - 1999 <br />The following observations are made based on the flows measured at gaging stations near the mine and <br />above Ralston Reservoir from October 1998 to September 1999: <br />• Flow in Ralston Creek is relatively constant (within the precision of the measurements) from above the <br />mine (station SW-UC) to below the mine property (station SW'-fiPl.), indicating that the measured <br />reaches are neither gaining nor losing. No large catchments are tributary to Ralston Creek within this <br />stretch. The discharge from the water treatment plant to the creek during the study period averaged ' I ~ <br />gpm (0.-17 cts). which is within the precision of the measurements. The added flow from the treatment <br />plant discharge is not manifested as an increase in measured tlows between stations SW-A001 and SW- <br />BDIS. <br />• The rating curve developed for station SW-OS appears to slightly overestimate tlows during low Clow <br />(~ - i cts) and high Clow (35 cfs) periods. The rating curve overestimates are even greater during <br />intermediate tlow periods (6 - 30 cts) at station SW-OS. However, when evaluated in combination, the <br />flow measurements and rating curves (Appendix A) from all nine stations provide a reasonably <br />accurate assessment of flow in Ralston Creek near the mine site. <br />• I"he stream flow in Ralston Creek was below normal during the monitoring period. The daily Clow data <br />measured by Denver Water was less than the monthly average during I 1 of the I _' gaging events ("fable <br />J I !19 R.07 I I l ~, Whetstone Associates • <br />
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