2011-05-11_REPORT - C1980005

• Permit No: C1980005
• IBM Index Class Name: Report
• Doc Date: 5/11/2011
• Doc Name: 2010 AHR Review
• From: DRMS
• To: Hayden Gulch Terminal, Inc
• Annual Report Year: 2010
• Permit Index Doc Type: Hydrology Report
• Email Name: JDM
• Media Type: D
• Archive: No

Based on a Memorandum of
Understanding between the
Division of Reclamation, Mining
and Safety and the Water Quality
Control Division (WQCD), the
WQCD will be responsible for
enforcing CDPS permit conditions.
The manganese standard was
8. Basic Standards for CWQCC regulations YES exceeded twice at Site 008. Based
Surface Water 31.1.11 on CWQCC reg. 31, the standard of
0.2 mg/I, applies to plants grown
in acidic soils (<6.0 pH). In alkaline
soils, as found on the Seneca II
site, the EPA standard would be 10
mg/l. The maximum manganese
value observed at any surface site
was 1.61 mg/I.
9. Instream Numeric CWQCC regulation 33.0 YES Four Seneca II monitoring sites
Standards exist within the Fish Creek
Drainage: The 008 outfall and
SSB12 are on Bond Creek and
discharge into Fish Creek which is
on Segment 13b of the Yampa
River basin. Sites SSF11 and SSF13
are on Fish Creek. The stream
standards for Fish Creek are based
on aquatic life standards. The total
recoverable iron standard (1.0
mg/1) was exceeded at site 008
with a value of 1.01 mg/I in
February and decreased to 0.38
mg/I by March.
10. Interim Narrative CWQCC regulation YES It was determined that bed rock
Standard for Ground 41.5.C.6 groundwater points of compliance
Water are unwarranted at the Seneca II
mine. Well SFAL72 serves as the
Seneca II Mine's Fish Creek Alluvial
ground water point of compliance.
Ambient values for this site were
higher than the Reg. 41 standards
for iron, manganese, nitrate, and
sulfates. The iron standard was
exceeded with values of 4.64 and
3.66 mg/l. It appears that the high
iron values observed at SFAL72 are
not likely the result of discharges