PERMFILE67666

• Permit No: C1981013
• IBM Index Class Name: Permit File
• Doc Date: 7/3/2003
• Section_Exhibit Name: Section 2.04 Site Description and Land Use Information
• Media Type: D
• Archive: No

Surface Water Monitoring
i WFC has been gathering stream flow and water quality
baseline data from the Purqatoire River and side-canyon areas
since February, 1984. This data has been gathered as per the
requirements of permit stipulations and the previous year's data
is presented in Exhibit 10, Annual Hydrology Report.
During the spring of 1984, flume stations were
constructed and Stevens Type F continuous recorders were
calibrated and placed in operation on Apache and Santistevan
Canyons on April 5 and 20, respectively. These stations were
maintained for a period of 14 months until sufficient data was
collected to differentiate seasonal flow variations. Also,
Ciruela Canyon stream flow has been monitored quarterly at two
surface stations, one above the Golden Eagle Mine and one at the
confluence with the Purgatoire River below the Golden Eagle
• Mine. Baseline studies of Lopez, Wet and Cherry Canyons began
in July, 1988. All data collected from these canyons is
summarized below.
Santistevan Canvon. During the flume monitoring period
of April, 1984, through August, 1985, flows ranged from 0.014 to
greater than 30.4 cfs with an average 24 hour mean of 0.096 cfs.
Monthly visits to the station began again in January, 1989, and
showed that the station was dry during the winter and spring
period. Runoff calculations indicate an annual discharge of 148
acre-ft. The majority of this runoff was recorded during the
summer months in the form of heavy localized thunderstorms.
These storms produced extreme spikes in the hydrograph, two of
which exceed the recording limits of the flume station. A
relatively constant flow was observed during the fall and winter
seasons dictated by snow and the freeze-thaw cycle, and limited
vegetation growth eliminating evapotranspiration water loss.

2.04-22 (Revised 09/01/89)