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. TABLE 2.04.6-10 <br /> CHE MICAL AND PHYSICAL PROPERTIES OF OVERBURDEN , INTERBURDEN <br /> AND UNDERBURDEN FOR PHASE I AND PHASE II SAMPLES C OLLECTED IN THE <br /> NEW HORIZON 2 STUDY AREA, MONTROSE COUNTY, COLORADO <br /> LITHOLOGIC UNIT' <br /> PARAMETER 1 2 3 4 5 Meant <br /> (UNITS) <br /> PH 7.2 6.7 7.5 6.0 7.6 7.1 <br /> EC, mmhos/cm 3.2 2.9 2.1 4.6 1.5 3.1 <br /> Sp, °/ 36.4 37.8 29.3 32.4 31.0 35.7 <br /> sand, % 63.1 67.9 71.3 68.0 76.2 64.5 <br /> Silt, % 24.8 22.7 22.1 23.6 17.5 24.3 <br /> Clay, % 12.1 9.4 6.6 8.4 6.3 11.2 <br /> Ca, meq/I 14.5 7.1 7.8 15.5 5.6 13.2 <br /> Mg, meq/I 17.0 5.9 4.7 16.1 3.0 14.8 <br /> Na, meq/I 8.7 9.2 6.5 13.7 5.1 8.7 <br /> SAR 4.5 12.0 6.6 6.4 2.7 5.4 <br /> ALK, meq/I 3.2 2.7 3.9 <7.4 3.2 <3.2 <br /> SO4, meq/I 40.9 38.7 21.2 61.5 14.6 39.5 <br /> AP' 13.6 27.5 4.2 32.2 3.3 14.6 <br /> NP' 37.4 9.1 20.5 8.0 21.5 32.1 <br /> ABP' 23.8 -18.4 16.3 -24.2 18.2 17.5 <br /> N03, ppm 2.9 2.2 2.6 1.5 1.9 2.7 <br /> NH4, ppm 37.3 46.9 31.5 50.7 24.3 33.4 <br /> B, ppm 0.6 0.3 0.3 0.5 0.3 0.5 <br /> Se, ppm <0.02 <0.03 <0.02 <0.03 <0.02 <0.02 <br /> Mo, ppm <0.07 <0.09 0.13 0.20 0.09 <0.08 <br /> Fe, ppm 12.4 58.2 11.8 69.5 10.8 18.6 <br /> Mn, ppm 1.5 2.1 2.6 3.1 0.6 1.7 <br />Lithologic units are identified in PeabodyAppendix 6-1 and discussed earlier in the Overburden, <br />Interburden, and Underburden Characteristics section. <br />Weighted mean value only includes Lithologic Units 1, 2, 3, and 4 which will all be disturbed by <br />mining. Mean thickness of Lithologic Units 1, 2, 3, 4, and 6 is 55.9, 6.5, 7.1, 2.7, and 9.7 feet, <br />respectively. <br />AP -acid potential, NP -neutralization potential, ABP -acid-base potential; Units are tons of <br />CaC03 required per acre furrow slice; AP and ABP were calculated predominantly from total <br />sulfur. Pyritic sulfur values were utilized to calculate AP and ABP whenever sulfurfractionation <br />analyses were available. <br />• Revised 27 Aug 2002 36 <br />