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

2.04 APFLICl+,TICti FCIt PF~tND:T F'OIt SORFl1CE CR ODIDIItL3~D@ID MIIZING ACS'14ITIFS -
2~NIMDDI RDQIIII2II~NP8 ECR IIgCIt~4~R'ICN CN FNVIIM23~lfAL RF:SOf1RG~3.
• 2.04.7 Hydrology Description.
(2) Surface Water Information.
(a) aryl (b) (Cont'd.)
moderately steep to rather gentle terrain with an average stream
gradient of 11$. Of the total drainage area, 3133.8 acres or
61.7$ are in the permit area.
During the 1983 field study, CWI located arxl described 34
hydrology features. Representative features are currently
monitored when accessible for flora rates and water quality
parameters in accordance with Volume 4, Tables 2 and 3. Refer
to Specific Basin Descriptions, Volume 5, for additional
information.
East Roatcap Creek is an ephemeral stream which drains an area
of 3.6 square miles (2304 acres). In the extreme northwestern
portion of the East Roatcap watershed, runoff is captured by the
Overland Ditch. Overall stream gradient is approximately 12%,
although steeper portions are located immediately upstream of
the confluence of Fast and West Roatcap Creeks. Peak stream
flows occur during March through June, with augmented flow from
diversion of irrigation water from the Overland Ditch during
• July through October. Per stipulation to Lease #C-37210, CWI
cong~leted construction of an Overlarxl Ditch diversion into West
Roatcap Creek during late summer of 1986. Irrigation flows to
water users below the lease and permit area would be diverted
into West Roatcap Creek from Overland Ditch, instead of East
Roatcap. Existing natural flows and some Overland Ditch
overflow would remain in East Roatcap Creek. The dendritic
drainage pattern of East Roatcap Creek may be modified by
geologic structures (faults or fracture systems). Of the total
drainage area, 85.80, or approximately 1978 acres, are in the
permit area. Topography of the East Roatcap Creek drainage is
characterized by moderately steep to steep terrain with isolated
areas of flat to gentle meadows. During the 1983 and 1991 field
studies, 31 hydrologic resources were located and characterized.
Representative features are currently monitored when accessible
for flow rates and water quality parameters >n accordance with
Volume 4, Tables 2 and 3.
The Orchard Valley West Mine site is located in the East Roatcap
drainage. Quality and quantity information have been obtained
in this drainage for several years. As part of the hydrologic
studies in the Orchard Valley West area, an additional temporary
stream flow flume was constructed arxi, with SW-6 results, gives
an indication of the loss/gain of East Roatcap Creek in the
Orchard Valley West portal area. CWI will monitor the stream
flow within Fast Roatcap when accessible. Quality information
will be gathered in accordance with Volume 4, Table 1.
TR 93-24 Revised 12/10/93
50