PERMFILE114594

• Permit No: C1981044
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: EXHIBIT 39 PAR 10/17/86 RESPONSES
• Media Type: D
• Archive: No

RESPONSE: SAR is calculated using a formula which is based upon a
• ratio of sodium concentration to the sum of the calcium and
magnesium concentration of a fluid, The mine discharge waters have
a high SAR because the sodium concentration is moderately high and
the calcium and magnesium concentrations are very low. Therefore,
for the SAR to rise significantly the sodium will have to increase.
A decrease in the calcium or magnesium concentration will not cause
an SAR increase in Williams Fork River water because their
concentration is already so small in the discharge waters. This
means that dissolved solids can be used as an indicator for SAR in
this case because it will increase with increasing sodium
concentration. Calcium, magnesium, and sodium do not have to be
measured.
h. Surface Water Legal Availability, 2.04.7-67 - No mention of the
relationship of surface water rights in the area to impacts from
the mine has been noted. A brief discussion should be included in
this section.
RESPONSE: Page 2.04.7-73 has been revised to address this issue.
is The life of mine clan called for underminino of the Williams Fork
AVF and portions of the Williams Fork and Yampa Rivers. However,
this undermining is not included within the 5-year plan except as
already exists in the overlying No. 5 Mine. It should be
emphasized that approval of this permit revision in no way implies
approval of any further active undermining of streams or AVF
systems. These area of underminino should actually be withdrawn
form the life of mine plan.
RESPONSE: The permit term for this revision is five (5) years as
addressed on page 2.01-1 of this application. Empire Energy
• Corporation has included the life of mine operation, outside of the
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