PERMFILE57625

• Permit No: C1982056
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: Exhibit 04e-10 Surface & Ground Water Hydrological Study
• Media Type: D
• Archive: No

-~ 12
Although diversions for irrigation were established on Fish and Middle
f Creeks in previous years, most have fallen into disuse and rigorous irrigated
agriculture is not practiced in the immediate area. Some of the old structures
do cause minor amounts of water to be diverted during high flow periods. No
special irrigation practices were observed in the intensive study area or
adjacent areas during the field investigations. The area Water Commissioner
of Division 6, District 57, Division of Water Resources of the Colorado
J Department of Natural Resources also indicated per telephone conversation
that the diversion structures discovered had been principally abandoned.
__- Climate of the area of interest is probably best characterized by the
record at Hayden, Colorado. Mean precipitation and temperature data for the
Hayden station are presented in Table 4. Solar radiation data and rain and
snow components of precipitation are also listed in Table 4. The precipita-
tion values in Table 4 are expected to be slightly on the low side for the
mine site because Hayden is somewhat lower in elevation. The elevation of
the station at Hayden is 6375 feet while the elevation of the Fish Creek
Mine area ranges from approximately 6610 feet to 7070 feet.
RUNOFF CHARACTERISTICS
As part of this study stream gaging stations were installed on Fish
and Middle Creeks. In addition several alluvial monitoring wells and
surface water quality stations were installed. Exhibit 1 shows the locations
of these stations. Data were also available for two USGS and three SEA-AR
gaging stations in the immediate area and the locations of these stations
are also included on Exhibit 1. The designation of stations uses the
following convention: FI, F0, and MI refer to Fish Creek, Foidel Creek,
and Middle Greek, respectively with a, b,..., referring to gaging stations
beginning at the upstream end of the reach. Numbers following the watershed
designation refer to alluvial wells, beginning with number 1 at the up-
stream end of the reach of interest. Capital letters A, B,..., following
the watershed designation refer to surface water sample collection points.
Stations MI-a and FO-a are actually USGS gaging stations with numbers
09243700 and 09243900, respectively. Similarly, station FI-a is actually
SEA-AR station number 1002.
Annual runoff from the Fish Creek, Foidel Creek, and Middle Creek
watersheds is dominated by snowmelt. Hydrographs depicting the seasonal
runoff characteristics for the period October 1, 1979 to December 31, 1980,
for stations AR-1001, FI-a, and AR-1003 are shown in Exhibit 4. Station