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

The highest monthly total flow occurred in May, 1984. Flow in
• East Roatcap Creek can be impacted by the Overland Ditch located
in the upper reaches of the drainage. Due to access problems to
the flume installed (SW-9) on East Roatcap Creek below the
Overland Ditch, it is difficult to evaluate the influence of this
ditch on the flow in East Roatcap Creek.
In past seasons the Roberts-Stucker ditch diverted flows to
East Roatcap Creek from the Overland Ditch in Section 3, R92W,
T13S. This 1986 season no water from the Overland Ditch was
discharged into East Roatcap Creek. More discussion of the
interaction of the Overland Ditch with East Roatcap Creek can be
found in "Detailed Description of the Overland Ditch Mitigation
Plan" in the existing permit to mine.
Water quality monitoring of East Roatcap Creek at station
SW-6 indicates the surface water in this stream is of
bicarbonate, sulfate type with relatively low total dissolved
solids content ranging from 40 to 380 mg/1. Higher
mineralizations typically occur during a period from January
through June and lower in August and September. Comparison of
the water quality samples taken simultaneously (August through
September, 1983) at stations SW-9 and SW-6 indicate that the
amount of total dissolved solids in East Roatcap Creek
approximately doubles from the upstream to the downstream
station.
• Numerous stock ponds and several springs are located in the
East Roatcap Creek watershed; all of these are upstream of the
proposed construction site. A reconnaissance study of the ponds
indicated that most collect runoff and seepage from colluvium.
Most of these man-made ponds are used for stock and wildlife
watering.
Water quality in the six monitored ponds is very similar to
that described for East Roatcap Creek. Water in the monitored
spring No. 30 has a slighly higher total dissolved solids content
(155 - 400 mg/1) than the ponds or East Roatcap Creek, however,
this water is also of bicarbonate, sulfate type. The range of pH
for all surface water samples within the East Roatcap Creek
drainage are between 6.5 and 8.4, averaging approximately 7.5.
2.5.1 Recommendations for Future Surface Water
Monitoring
In addition to the ongoing surface water monitoring program
as discussed in Section 2.5, we recommend including the following
additional monitoring:
o Collection of monthly water quality samples
at station SW-6A prior and during
`. construction;
o Daily flow measurement at station SW-6A for
at least 40 days prior to construction;
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