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An aluminum-based drill stem joint lubricant was used at all 1991 Phase II sample sites. • <br />The four holes were drilled exclusively with air since good circulation was maintained. <br />Sites 30488, 30498, and 30518 were ell dry holes. ~Sita 30508 was dry to 24.8 feet and_~ <br />artesian water was encountered below this depth. <br />The core drilling and sampling methods were identical to those previously described for <br />Phase I. Overburden cuttings (chip samples) were collected exclusively with air from all <br />four holes. Chip samples were collected on two-foot vertical increments from the soil <br />surface to the top of coal for Sites 30488, 30498, end 30518. Core samples were collected <br />at Site 30508 from 24.8 feet to 91.8 feet once ground water was encountered. Chip samples <br />were collected with sampling buckets by using a 4-3/4-inch Tricone rock bit. A <br />geophysical log which included density, resistivity, end natural gamma was also completed <br />for each hole. The core end chip samples were described in the field by the driller and <br />subsequently by a soil scientist. The li thalogy for these sites is presented in Appendix <br />b-1. Chip samples were composited in the field according to the lithologic and <br />stratigraphic descriptions. Once ell chip samples end cores were drilled, sampled, <br />described, and boxed, they were shipped by truck to InterNountein Lab in Farmington, Neu <br />Mexico. • <br />Parameter Selection - Phase f. The Phase 1 overburden sampling and analyses plan for <br />Yoast was developed after en extensive review of recent literature, consultation with <br />CMLRD end OSMRE, and previous sampl in9 conducted at the Seneca II and II-N Mines. The <br />Phase I plan was implemented prior to existing Colorado guidelines (CMLRD, 1982) and prior <br />to developing the Current proposed permit boundary. <br />The following chemical end physical parameters were determined for the Phase I evaluation <br />of overburden material in the Toast study area: <br />- Paste pN <br />- Paste extract conductivity (EC) in nxnhoslcm at 25°C <br />- Saturation Percentage (SP) <br />- Particle Size (X sand, silt, and clay) <br />- Nater Soluble Cations Calcium (Ca), Magnesium (Ng), and Sodium (Na) <br />- Sodium Adsorption Ratio (SAR) <br />- Not water extractable Boron (8) and Selenium (Se) <br />- Ammonium oxalate extractable Molybdenum (MO) • <br />- Sulfur (S) or Acid Potential (AP) <br />16 <br />