PERMFILE134290

• Permit No: C1981038
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: VOLUME 4-SURFACE WATER APPENDIX- EAST ROATCAP CREEK
• Media Type: D
• Archive: No

• 2.4 Existing Surface Water Rights
Most of the ponds and springs located within the East
Roatcap Creek watershed and above the proposed construction site
have adjudicated water rights. A complete listing of water
rights can be found in Volume 5 and SA of the existing approved
permit to mine. Because all adjudicated surface water rights in
the East Roatcap Creek drainage area are located upstream of the
new portal bench no potential impacts on these water rights by
the proposed construction is anticipated.
2.5 Ongoing Surface Water Monitoring
Surface water monitoring on East Roatcap Creek was initiated
in September 1982 with the installation of a 3 foot Parshall
flume equipped with a continous recorder. This station, SW-6, is
located on East Roatcap Creek at its exit from the permit area.
Later, in July, 1983, an additional Parshall flume was installed
(SW-9) on East Roatcap Creek below the Overland Ditch headgate.
Monitoring at this station was discontinued due to access denial.
Monitoring of East Roatcap Creek consisted of continuous
flow monitoring and quarterly water quality sample collection.
In addition to stream monitoring, a total of 28 ponds and 4
• springs were identified within the East Roatcap Creek watershed
upstream of the proposed construction. Four of the ponds
(Numbers 86, 87, 88, and 89) and one spring (Number 30) were
regularly monitored since 1983. This monitoring consisted of
flow measurement, if any, and quarterly water quality sample
collection. Continuity of monitoring was limited during winter
months by access problems.
In June, 1986 an additional temporary 2 foot Parshall flume
was installed on East Roatcap Creek (SW-6A), approximately 1,200
feet upstream of the proposed portal bench.. Monitoring at this
flume provided more site specific flow data and allowed us to
establish a relationship between the surface stream and the
shallow (colluvial) aquifer within the construction area.
Monitoring at this flume was discontinued after 40 days and after
consultation with the Colorado Mined Land Reclamation Division.
Location of Surface water monitoring stations are shown on Figure
H-1 and Drawing DO1 50118 in the confidential volume of the
approved permit to mine. Monitoring station summaries are
enclosed in the Hydrology Appendix.
Continuous flow monitoring at station SW-6 indicates that
peak flows occur in April through June of each season in direct
response to snowmelt. Maximum peak flow for a period from
September, 1983 through December, 1985 was recorded on May 15,
. 1985 as 98.83 cfs. However, there is an indication that flow
overtopped the flume in June, 1983. High water marks recorded at
this monitoring site indicate a peak flow of approximately 85
cfs. Monthly total flows of 5.5 to 1,087.5 cf were recorded.
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