2014-10-10_PERMIT FILE - C1996083 ‎(2)‎

• Permit No: C1996083
• IBM Index Class Name: Permit File
• Doc Date: 10/10/2014
• Doc Name: WWE Subsidence Impact Evaluation - PR14 Spruce Stomp
• Section_Exhibit Name: Volume IIIB Exhibit 23 Spruce Stomp Subsidence Evaluation
• Media Type: D
• Archive: No

TABLE 7
Potential Aquatic Life Impacts Summary Table
Type of
Surface
Potential Stress to
Preliminary Aniticipated Outcome
Baseline Data Used To Assess Expected
Monitoring Data Needed for Early Detection
Aquatic Life
Impacts /Stress
of Impacts/Stress
Impact
Minor. At the panel centers the maximum
expected change in stream slope is 1.5%
Elevation information and structural habitat
Collection of stream survey and biologic
Change in stream
(compared to average stream slopes of 5-
observations to identify stream characteristics.
monitoring to identify if structural habitat is
structural habitat
10 %). Subsidence transitions are expected to
Review of existing biologic data to identify current
undergoing changes and if these changes are
be gradual and may not be easily recognized
community and expected habitat requirements.
eliciting a shift in the biologic community.
without survey.
Minor. Some areas could see minimal
Consideration of flow volume and velocity paired with
Monitoring of flow volume and velocity as well
Subsidence of
Changes in stream
increased or decreased water velocity due to
precipitation data as well as review of hydrology
as precipitation. Periodic comparison of data to
areas
hydrology
slight grade changes. Stormwater runoff and
characteristics of nearby creeks underlain by
historic record would identify shifts in hydrologic
underlain by
shallow groundwater hydrology changes are
subsidence mining.
regime.
mining panel
expected to be minimal.
Elevation and survey information in the vicinity of the
Collection of elevation and survey information to
Minor. Certain areas within the stream or
stream channel. Soil and outcrop mapping with
identify areas which are becoming steeper.
Increased erosion and
adjacent terrain may become steeper by up to
erosion potential Water quality data including TSS
.
Periodic visits to site to identify new areas of
sediment transport
o
approximately 1.5% which could increase rates
and turbidity. Consideration observed impacts a
erosion and monitor existing erosion areas.
of erosion and sediment transport.
nearby stream underlain by subsidence mining. .
y
Regular water quality monitoring to include
analysis of TSS and turbidity.
Increased percolation
Geologic analysis of colluvial thickness within
Monitoring of surface water flows in conjunction
of water into subsurface
None to minor. Based on geologic analysis,
Potential Project to identify possible exposure of
with monitoring potential water seepage into the
material which would
fractures are expected to "heal" rapidly.
bedrock fractures to shallow groundwater.
mine. Use data to identify if pre- mining
reduce flows, es eciall
p Y
Consideration of studies from nearby streams
Y
characteristics are changing e. changing
9 9( 9•. 9 9
Fractures in
low flows
underlain by subsidence mining.
from gaining to losing stream).
bedrock at or
nearthe
surface
Changes in water
None to minor. From what we know of the
Geologic mapping to identify types of rock that could
chemistry due to
g eolo gy' the material that could be exposed as
be exposed to surface water following fracturing.
Ongoing water quality monitorin to identify if
increased rate of
weathering of
a result of fracturing is not likely to undergo
Existing water quality data for metals and other
any chemical parameters begin to increase
previously unexposed
significantly higher rates of weathering leading
chemicals which are encountered during mining
following the commencement of mining.
material
to dramatic water chemistry changes.
activities in this part of Colorado.