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2015-05-18_HYDROLOGY - M1983067
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2015-05-18_HYDROLOGY - M1983067
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Last modified
4/21/2025 2:14:46 PM
Creation date
5/19/2015 7:46:44 AM
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Template:
DRMS Permit Index
Permit No
M1983067
IBM Index Class Name
HYDROLOGY
Doc Date
5/18/2015
Doc Name
Six-month update
From
Environment, Inc.
To
DRMS
Email Name
TOD
Media Type
D
Archive
No
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Environment, Inc. Page 2 <br />May 12, 2015 <br />an average of 439 gallons per minuet (1.45 Aft/day for a total of <br />317.5 Aft from 9/6/14 to 4/23/15. Table 3 shows the data collected <br />on the lake elevation changes. <br />The second Project was to improve the groundwater drain ditch <br />located on the Worthing Pit and to allow for direct flow back to <br />the river. This was to lower the groundwater on the Worthing Pit <br />and provide a means for water that may mound along the edge of the <br />backfill in that mine to stabilize at the historic elevation for <br />that site. This was complete in early January 2015. <br />We have seen progress in reducing the groundwater elevations <br />in all of the wells that vary from 9.57 inches in MW#7 to 24.36 <br />inches in MW#2. In particular MW#8 has dropped 12.13 inches and we <br />believe it will continue to drop as the groundwater level begins to <br />equalize now that the ditch is at its final elevation. Some of <br />this drop may be associated with the natural seasonal changes to <br />the ground water table. <br />In addition, Albert Frei and Sons has commissioned a study <br />from Deere & Ault Engineers to do a historic seepage study for the <br />area, to determine historic groundwater flows thru the Stagecoach <br />Pit. <br />Since there has been positive progress made we believe it is <br />warranted to continue monitor the wells for another 6 months to <br />compile a 12one year cycles to see if the changes are permanent. <br />We also understand there may be additional changes depending on <br />what occurs at other mines in the vicinity that may help further <br />reduce the up -gradient groundwater loading we are seeing. This <br />would further lower the ground water elevation and allow us to <br />evaluate what if any additional steps are needed. <br />If you have any questions please call me at 303-423-7297. <br />Respectfully Submitted, <br />Environment, Inc. <br />C�7� 4�?i <br />Stevan L. O'Brian <br />President <br />cc Albert Frei & Sons, Inc. <br />Tyler O'Donnell via e-mail <br />file <br />enclosures <br />
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