PERMFILE116948

• Permit No: C1981022
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: DISCUSSION ON HYROLOGY SOMERSET MINE
• Section_Exhibit Name: Exhibit 2.04-E4 Part 2
• Media Type: D
• Archive: No

2.13 During the normal
the quantity of "low flow" month
water diverted has of August,
varied from
a low of l~.i~ cfs in 1974, 1976. 1977, and 1979
to a high of U.4U!i cfs in 197'x. The 30 year
average is ~~.1~• c fs during July. The diversion
records do not indicate any detect able impact
as a result of mi ne inflows in 1981 and 1982.
2.2 Deertrail Ditch
x.21 The Deertrail Ditch has a decreed capacity of
J,BJ cfs and a diversion capacity of 3.S~~cfs.
2.~2 The 1972-I9H2 diversion records of the Division
of Water Resources indicate a year round use
of ci to 1.5 cfs and an irrigation season requirement
of approximately 1.0 to 4.ii cfs (including year
round use).
2.~3 The diversion quantity varied from a high of
5.0l~ cfs recorded in May of 1974 to a low of
i~.Q in August 1977. The records show that the
ma::imum diversion of water occurs during the
hiyh flow months of May and June with decreasing
quantities during July, August, and September.
During the "dry" years of 1976 and 1977 the volume
• of water diverted was e::tremely low due to a
lacL: of creel: water caused by two successive
dry years. The ~ 4Jest Main entries did not e:<tend
under Hubbard Creel; until 1981 and could not
have had any irt~pact during these "dry" years.
Examination of the diversion records for both ditches show
that the water diverted from Hubbard Creel:: varies considerably
within the irrigation season and widely from year to year.
The amount of water diverted appears to be related to the
available water stored in the snowpacl: in the higher elevations
and the rate of snow melt. Any impact from the underground
worLings would be minimal compared to variations in the
available water.
3. Hubbard Creel; has a fairly steep gradient 1n the area overlying
and near the mine workings, Measurements by U. S. Steel
Mining Co. indicate an average velocity of 104 ft, per
minute in the some ~!i!i0 ft. of creek 1n this area. based
on this measured velocity the water in the stream would
have a "dwell time" of '~9 minutes in the area near the
mine workings. This short "dwell time" near the mine workings
reduces the opportunity for diversion of water to the under-
ground warV.ings.
• It is the Operator's opinton that an enterception of the Hubbard
Greek flow into the mine would result in a mayor increase of
the inflow to the mine in this area and the chemical water analysis
2