2010-12-17_REVISION - C1981019 ‎(108)‎

• Permit No: C1981019
• IBM Index Class Name: Revision
• Doc Date: 12/17/2010
• Doc Name: Rule 2.05 Operation and Reclamation Plans
• Type & Sequence: PR3
• Media Type: D
• Archive: No

RULE 2 PERMITS
SAR > 15 = 111.2 feet
Se >0.3 =0feet
B > 5.0 = 0 feet
Sat <25 or >80 = 68.3 feet
Mo > 1.0 = 0 feet
Total Drill Hole Depth = 663.3 feet
Total Percentage of unsuitable material:
SAR = 111.2 feet/663.3 feet = 16.764661541%
Se = N/A
B = N/A
Sat = 68.3 feet /663.3 feet = 10.296999849%
Mo = N/A
Drill Hole C -04 -36
Unsuitability range in feet:
SAR > 15 =19.9 feet
Se >0.3 =5.15 feet
B > 5.0 = 0 feet
Sat <25 or >80 = 85.6 feet
Mo > 1.0 = 0 feet
Total Drill Hole Depth = 610.6 feet
Total Percentage of unsuitable material:
SAR = 19.9 feet/610.6 feet = 3.2590894202%
Se = 5.15 feet/610.6 feet = 0.84343268916%
B = N/A
Sat = 85.6 feet/610.6 feet = 14.018997707%
Mo = N/A
No Special Handling Procedures will be required for the overburden in the Collom Area. It was discussed
between the Division of Reclamation, Mining and Safety (DRMS) and Colowyo that suspect levels of the
Sodium Adsorption Ration (SAR), Selenium (Se), Boron (B), Saturation % (Sat), and Molybdenum (Mo)
need to be addressed in more detail to determine that Special Handling Procedures, that are outside the
normal pit operational procedures, will not be needed in the Collom expansion area. Review of the
analysis spreadsheets in Exhibit 6, Item 9 demonstrate minimal instances of analyses for pH, electrical
conductivity, nitrate as N and Acid -Base potential being outside of the suitable range for the four drill
holes analyzed above.
Based on similarities between overburden suitability analysis results in the Colowyo existing permit area
and the Collom permit expansion area, and on previous discussions between CDRMS and Colowyo,
suspect levels of Sodium Adsorption Ratio (SAR), Selenium (Se), Boron (B), Saturation percent (Sat),
and Molybdenum (Mo) will not need to be addressed in more detail to determine if Special Handling
Procedures, that are outside the normal pit operational procedures, will be needed in the Collom area.
Historically, beginning around 1983, Colowyo initiated overburden monitoring in both the pit
(truck/shovel materials) and on regraded overburden. See CDRMS Permit Exhibit 6, Item 4 as described
in the associated January 4, 1983 Colowyo memo to Dan Mathews, CDRMS, for an overview of this
initial program. Starting in 1990, Colowyo eliminated the in -pit sampling program. Sufficient data had
been collected to indicate that all weathered overburden material (ie within — 50 fee of the ground
surface) was suitable for replacement onto the reclaimed surface prior to topsoil replacement. Three
Collom — Rule 2, Page 97 Revision Date: 1/23/09
Revision No.: PR -03