2007-07-30_PERMIT FILE - C1981008A ‎(43)‎

• Permit No: C1981008A
• IBM Index Class Name: Permit File
• Doc Date: 7/30/2007
• Section_Exhibit Name: Section 2.04.6 Geology Description
• Media Type: D
• Archive: Yes

Table 2.04.6-10
• Chemical And Physical Properties Of Overburden, Interburden
And Underburden For Phase I And Phase ii Samples Collected In The
New Horizon 2 Study Area, Montrose County, Colorado
•
f, J
LITHOLOGIC UNIT'
PARAMETER 1 2 3 4 5 Meant
(UNITS)
PH 7.2 6.7 7.5 6.0 7.6 7.1
EC, 3.2 2.9 2.1 4.6 1.5 3.1
mmhos/cm 36.4 37.8 29.3 32.4 31.0 35.7
Sp, % 63.1 67.9 71.3 68.0 76.2 64.5
sand, % 24.8 22.7 22.1 23.6 17.5 24.3
Silt, % 12.1 9.4 6.6 8.4 6.3 11.2
Clay, % 14.5 7.1 7.8 15.5 5.6 13.2
Ca, meq/I 17.0 5.9 4.7 16.1 3.0 14.8
Mg, meq/I 8.7 9.2 6.5 13.7 5.1 6.7
Na, meq/I 4.5 12.0 6.6 6.4 2.7 5.4
SAR 3.2 2.7 3.9 <1.4 3.2 <3.2
ALK, meq/I 40.9 38.7 21.2 61.5 14.6 39.5
504, meq/I 13.6 27.5 4.2 32.2 3.3 14.6
AP' 37.4 9.1 20.5 8.0 21.5 32.1
NP' 23.8 -18.4 16.3 -24.2 18.2 17.5
ABP' 2.9 2.2 2.6 1.5 1.9 2.7
N03, ppm 31.3 46.9 3t.5 50.7 24.3 33.4
NH4, ppm 0.6 0.3 0.3 0.5 0.3 0.5
B, ppm <0.02 <0.03 <0.02 <0.03 <0.02 <0.02
Se, ppm <0.07 <0.09 0.13 0.20 0.09 <0.08
Mo, ppm 12.4 58.2 11.8 69.5 10.8 18.6
Fe, ppm 1.5 2.1 2.6 3.1 0.6 1.7
Mn, ppm
' Lithologic units are identified in Attachment 2.04.6-1 (previously Peabody Appendix 6-1)
and discussed earlier in the Overburden, Interburden, and Underburden Characteristics section.
2 Weighted mean value only includes Lithologic Units 1, 2, 3, and 4 which will all be disturbed
by 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, respectively.
' AP -acid potential, NP -neutralization potential, ABP -acid-base potential; Units are tons of
CaC03 required per acre furrow slice; AP and ABP were calculated predominantly from
total sulfur. Pyritic sulfur values were utilized to calculate AP and ABP whenever
sulfur fractionation analyses were available.
REVISED Avguat 2006
2.04.6-42