2010-12-17_REVISION - C1981019 (103)

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RU 2 PERMITS MA ...�..,w:. %r�re'.;�_r4".dS ?Y9 z a691s wFdd ibdre n r.i�u�. " e`�,s y, are distributed sufficiently to meet this criterion for the Collom Lite pit with some coverage for the Little Collom X pit. Overburden and interburden samples from drill holes 97 -06, 97 -09, 97 -15, 99 -02, 99 -04, 99 -09, 00 -03, and 00 -08 were collected from cuttings obtained during the drilling of each hole. The holes were drilled with air. When a water source was encountered during drilling, water was injected to help flush the cuttings from the holes. This continued until cuttings were no longer obtainable. Overburden samples from drill holes C- 04 -04, C- 04 -14, C- 04 -25, C- 04 -36, C- 05 -26, and C -05 -32 were obtained from core samples. Drilling depths ranged from ground surface to between approximately 450 feet and 818 feet in depth. Samples were collected from intervals based on the material properties such as color and texture or were collected at regular predefined intervals. Sample intervals ranged from approximately one foot to 15 feet and averaged 5 feet. A total of 619 discrete samples were collected and analyzed to characterize approximately 4,212 feet of overburden. Coal seams within the drill holes were also analyzed but are not included in this section because coal will not be used as reclamation material. The following analyses and sample preparation were performed on overburden and coal samples: Physicochemical Analysis and Methods • pH, sat paste • Electrical Conductivity @ 25 C • Saturation • Texture • Ca (sat paste) • Mg (sat paste) • Na (sat paste) • SAR • Cation Exchange Capacity • Exchangeable Na • Exchangeable Sodium percent • Se (hot water) • B (hot water) • NO2 -NO3 (paste) • Mo (NH4 oxalate) • As, Hg, Pb, Zn, Fe, and Mn (AB -DTPA Extractable) • NP as CaCO3 USDA No.60 (21A) EPA Method M120.1- meter,w /sat paste USDA No. 60 (2) ASTM D 422 Hydrometer EPA Method M6010 ICP EPA Method M6010 ICP EPA Method M6010 ICP calculation NH USDA No. 60 (19) NH extractable, M601 0B ICP Exchangeable Na/CEC SM3500 -Se.0 EPA Method M6010 ICP EPA Method M353.2- automated EPA Method M6010 ICP EPA Method M6010 ICP EPA Method M600/2 -78 -054 3.2.3 • Total Sulfur • Sulfur Forms in percent EPA Method M600/2 -78 -054 3.2.4 • Acid Generation Potential (AGP), Acid Neutralization Potential (ANP) and Acid Base Potential (ABP) EPA Method M600/2 -78 -054 1.3 • AGP:ANP calculation Sample Preparation Methods • Air Dry @ 34° C USDA No. 1, 1972 Collom — Rule 2, Page 30 Revision Date: 1/23/09 Revision No.: PR -03