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2008-05-29_REVISION - M1977285
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2008-05-29_REVISION - M1977285
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Last modified
6/15/2021 10:32:51 AM
Creation date
10/28/2008 12:22:24 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1977285
IBM Index Class Name
REVISION
Doc Date
5/29/2008
Doc Name
Drainage report for Sunday Mines Group
From
Denison Mines
To
DRMS
Type & Sequence
AD1
Email Name
RCO
Media Type
D
Archive
No
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Section 4 <br />St. Jude Mine <br />4.1 Existing Drainage Conditions <br />St. Jude Mine has a drainage area of approximately 12.7 acres. Surface drainage flows <br />northeast to an earthen berm, which directs the flow to the northwest into a <br />temporary sediment basin on the northwest side of the site. The basin discharges to <br />the north into an unnamed tributary of Big Gypsum Creek, located approximately 3/4 <br />mile north of the mine workings area. <br />4.2 Drainage Plan <br />CDM delineated five basins based on the existing mine surface as illustrated in <br />Exhibit C-1: <br />1. Basin 1 - Surface water run-on from offsite southwest of the surface mine <br /> facilities. <br />2. Basin 2 - Surface water run-on from offsite southeast of the surface mine facilities. <br />3. Basin 3 - Surface facilities area. <br />4. Basin 4 - North WRA slope. <br />5. Basin 5 - East WRA slope. <br />4.3 Peak Discharge Estimate <br />CDM estimated the 100-year peak discharge using the following USGS regionalized <br />flood-frequency equations for Colorado (USGS 2000): <br />Qioo - -118.4(A) 0.715 <br />where : <br />Qioo =100-year peak flow in cfs <br />A = drainage area in square miles <br />As discussed previously, CDM increased the calculated discharge from the flood- <br />frequency equation by the standard error or 78 percent. Table 4-1 presents CDM's <br />estimated 100-year peak discharges for each basin of the St. Jude Mine. CDM used the <br />100-year peak discharges to design the surface water drainage structures. <br />t? <br />4-1 <br />0: 84986 - Denison\Task Order 1 - Sunday Mines Drainage Study\ReportlFinal ReportVinal Sunday Mines Drainage Repori_052208.doc
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