GENERAL33297

• Permit No: M1983194
• IBM Index Class Name: General Documents
• Doc Name: COVER SHEET 3 TEXT CHANGES TO DRAFT EIS
• Media Type: D
• Archive: No

3. TEXT CHANGES
4.18.2.2 Water Resources
There would be the potential for ashort-term reduction
in the flow of Yellow Creek (Table 4-3) as a result of
the production of water for use by the mine. This reduction
in flow could exist for many years after the end of mine
life. There would be the potential for along-term impact
[o the water quality of the base of the lower aquifer bequse
of the amount of inaease io the surface area of the base
of the lower aquifer in contact with :aline minerals as a
result of cavity collapse. This potential impact would persist
for the foreseeable future (less than 100 years) and would
be locally significant if the state standard for total dissolved
solids concentration was exceeded.
Page 4-32
(11)
Column 1, paragraph 5, sentence l: "...around the
area would shift to ...:' should read: "...around the
area may shift to ... '•
4.18.4,2 Water Resources
The mine site is approximately 6 miles from the C-a
Prototype Oil Shale Tract. The baseline Cor this environ-
mental impact statemem assumes that C-a tract will be in
production while this mine is operating. The open-pit mine
on Tract C-a would cause very significant impacts to the
groundwater system (USDI, BLM 1985b). The dewatering
that would be required for mine development could change
the rate and duection of flow in the groundwater within
the sodium leases. ALw, dewateriog the pit for C-a could
dramatically lower water level and change water quality
parameters at the sodium mine site. A detailed plan for
the development of Tray C-a is not available. It is therefore
not possible to tell with any accuracy what impacts to the
groundwater, caused by C-a, would extend to the sodium
leases. All that can be said is that these impacts are likely
to be very significant. Impacts to the groundwater from
the proposed sodium mine are analyzed against existing
conditions. The development of Tray C-a, however, could
change existitg conditions in the groundwater system
beneath the sodium leases so dramatically that impacts from
the proposed sodium mine would be undefinable. The
impacts related to the sodium mine are insignificant by
comparison with C-a.
(11)
Column 1, Section 4.18.3.2, Water Resources: Replace
entire section.
4.18.3.2 Water Resources
The water remaining in the cavities alier production ceased
would be unavailable for all other potential other uses for
the foreseeable future. There would be the potential for
an irteversible impact to the water quality of the base of
the lower aquifer because of the amount of increase in the
surface area of the base of the lower aquifer in contact
with saline minerals as a result of cavity collapse. This
potential impact would persist for tine foreseeable future
(less than 100 years) and would be locally significant if
the state standard for total dissolved solids concentration
was exceeded.
Page 4-33
Column 1, Section 4.18.4.2, Water Resources: Replace
entire section.
Page 5-3
Column I, after Lee Stevens add: "Jack Wenderoth
]ob Title: Hydrologist; Water Resources
Education; B.S, 1979, Forest Resources-Science Option,
University of Idaho, Moscow, Idaho
E:perience: Soil Scientist, Soil Conservation Service, 1
1/2 years; Hydrologist, BLM, 4 years; Natural Gas
Production Specialist-Hazardous Materials and Waste,
Department of Defense, 1 year; Hydrologist, BLM, 1 year"
Page 6.6-2
{13)
Column 2, paragraph 1, sentence 1; "...overlying a
Class 11 mine zone ...:' should read: "...overlying
a Class Ill mine zone ...."
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