2011-06-17_REPORT - C1981014

• Permit No: C1981014
• IBM Index Class Name: Report
• Doc Date: 6/17/2011
• Doc Name: 2010 Annual Hydrology Report
• From: Energy Fuels Coal Inc
• To: DRMS
• Annual Report Year: 2010
• Permit Index Doc Type: Hydrology Report
• Email Name: JHB
• Media Type: D
• Archive: No

EFCI Southfield Mine - 2010 Annual Hydrology Report May 30, 2011
3.3 Surface Water Monitoring Results
Mine Area
The mine and adjacent areas fall within the lower portions of the Magpie and Newlin Creek
drainages and encompass the central portion of the Second Alkali Creek drainage, all of which are
tributary to the Arkansas River. Newlin Creek is a perennial drainage above the mine permit area
and to the diversion point for the City of Florence Municipal Water Supply. Within the mine permit
boundary, flows in Newlin, Magpie, and Second Alkali Creeks are all ephemeral (refer to Section
2.04.7 of the Southfield permit application for more details). EFCI monitors any significant stream
flows in Newlin, Magpie, and Second Alkali Creeks, and also monitors any storm water runoff
discharge from the two remaining sedimentation structures.
In the mine site area, the current surface water monitoring program includes the following
monitoring stations, located as shown on Figure 1, Mine Monitoring Locations:
Station Location Designation
NC-2 E'hSE'/4, Sec 26 Newlin Creek (Upper)
NC-1 W'/ONE'/4, Sec 19 Newlin Creek (Lower)
MC-1 E'/2NW'/4, Sec 30 Magpie Creek (Upper)
MC-2 W'/2NE'/4, Sec 30 Magpie Creek (Lower)
SA-1 E'/ZNW'/4, Sec 24 Second Alkali Creek, near MW-65
NPDES 002 E%2NW'/, Sec 30 Pond 4 (outfall to Newlin Creek)
NPDES 004 W%zSE'/4, Sec 19 Pond 5 (outfall to Magpie Creek)
Two sediment ponds and associated stations (001 and 003) were removed and reclaimed in
conjunction with final mine reclamation activities. In Addition, EFCI no longer includes previous
monitoring data from the single monitoring point that existed on Newlin Creek prior to second
quarter of 1997, when the two current monitoring points were established.
Surface water monitoring is conducted on a semi-annual basis, typically in April and December.
Field and laboratory analysis data for surface water monitoring stations are summarized in the
following discussions. Stream flow measurements since 1999 are provided in Table 8, and field and
laboratory data for the reporting period are provided in Appendix B. No NPDES discharges from
ponds occurred in 2010 so there is no corresponding field or analytical data enclosed.
Spring rain/snowfall events provided relatively small, short duration flows in Newlin Creek, and
water samples were obtained. Dry creek beds prevailed in Magpie Creek and in Second Alkali
Creek throughout the reporting period. Historic field and laboratory water quality data for the
surface water monitoring stations on Newlin, Magpie, and Second Alkali Creeks are summarized in
Tables 9, 10, 11, 1.2 and 13. The two sedimentation ponds (Ponds 4 and 5) did not fill to the point of
discharge during 2010, but did contain small pools in the 2" d and 3rd quarters from rain events.
A review of the April sample data from both Newlin Creek monitoring points indicates missing data
for total calcium, magnesium, manganese, sodium, and iron (see Tables 9 and 10). These same
parameters were missing from the analytical results for Oak Creek samples taken in May 2008, and
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