2016-02-03_PERMIT FILE - C1981038 ‎(2)‎

• Permit No: C1981038
• IBM Index Class Name: Permit File
• Doc Date: 2/3/2016
• Section_Exhibit Name: Volume 1 2.04 Environmental Resources
• Media Type: D
• Archive: No

42.04 APPLICATION FOR PERMIT FOR SURFACE OR UNDERGROUND MINING ACTIVITIES --
~ MINIMDM REQUIREMENTS FOR INFORMATION ON ENVIRONMENTAL RESOIIRCES.
2,04,7 Hydrology Description.
(1) (b) (Cont'd J
features, where presumably near surface groundwater
flow saturates the regolith, resulting in slump struc-
tures with attendant springs and seeps and infiltrates
back into the colluvium. Cumulative discharge repre-
sents a small fraction of total run-off, and most of
the available near surface groundwater is believed to
be transpired by native vegetation. bTymore (1974)
states, "that natural plant associations have normal
evapotranspiration rates that far exceed normal precip-
itation during the growing season, which effectively
prevents deep percolation losses during most of the
year" for the Piceance and Yellow Creek watersheds of
West-Central Colorado. For specific information re-
garding origin, use, and field parameters for each
spring, consult the Ground Water Appendix, Volune 4.
The contribution of spring discharge to stream flow in
individual watersheds on a monthly basis is insignifi-
cant; typically, stream flow is many orders of magnitude
• greater than spring discharge. Spring flow is ambigu-
ously highest during peak stream flow due to super
saturation and very near surface flow in the colluvium
(refer to hydrology monitoring graphs in Volume 4).
The significance of spring discharges to maintaining
stream flow is virtually nonexistent, as demonstrated in
Volinne SA. The evapotranspiration demands of vegeta-
tion, small cumulative discharge, and gain-loss data
presented by Brooks (1982) indicates that streams tra-
versing the permit area are losing flow, and spring
discharge does not enhance the ephemeral nature of
streamflow. The significance of springs to maintaining
the land use patterns of the area is described in the
Probable Hydrologic Impact, Section 2.05.6. Generally,
Coll w ial springs are marginally suitable for human
consumption with the exception of fecal coliform levels
which typically rise due to livestock pollution and are
acceptable for Livestock use. Small discharges pre-
clude any agricultural or aquatic use.
Colluvial springs are typically characterized by total
dissolved solids values less than 1,000 mg/1 and are
• Added 12/26/84
Revised 12/26/84
Revised 10/12/86
Revised 10/01/87
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