PERMFILE61423

• Permit No: C1982056
• IBM Index Class Name: Permit File
• Doc Date: 9/14/2005
• Section_Exhibit Name: Exhibit 16e 6 Main North Intake Shaft Soils Investigation
• Media Type: D
• Archive: No

Fish Creek Soil Investigation
APPENDIX 3
AABERG SERIES
The Aaberg series consists of moderately deep, moderately well drained or well drained soils
formed in f ne textured sediments weathered from underlying clay shale. Aaberg soils are on
upland hills and ridges. Slopes are 2 to 65 percent. The mean annual precipitation is about 10
inches and the mean annual temperature is about 37 degrees F.
TAXONOMIC CLASS: Fine, smectitic, frigid Leptic Udic Haplusterts
TYPICAL PEDON: Aaberg clay -grassland. (Colors aze for dry soil unless otherwise noted.)
A--O to 4 inches; grayish brown (2.SY 5/2) clay, very dark grayish brown (2.SY 3/2) moist;
strong fine granular structure; soft, friable, sticky and plastic; mildly alkaline (pH 7.6); clear
smooth boundary. (3 to 6 inches thick)
Bw--4 to 23 inches; light olive brown (2.SY 5/3}clay, olive brown (2.SY 4/3)) moist; weak
medium prismatic structure parting to moderate medium angulaz blocks; slightly hazd, friable,
sticky and plastic; peds are extremely hard; few thin glossy patches on faces of peds; cracks 1 to
2 cm. wide when dry; few slickensides; mildly alkaline (pH 7.6); gradual wavy boundary. (10 to
37 inches thick)
BC--2 to 30 inches; light olive brown (2.SY 5/3) clay, olive brown (2.SY 4/3) moist; weak coazse
angular blocky structure; slightly hard, friable, sticky and plastic; peds aze extremely hard; few
slickensides; cracks ] to 2 cm. wide when dry; strongly effervescent; moderately alkaline (pH
8.0); gradual wavy boundary. (0 to 10 inches thick)
TYPE LOCATION: Jackson County, Colorado; ]/4 mile east and I/8 mile north of the south
1/4 corner of Sec. 35, T. 9 N., R. 78 W.
RANGE IN CHARACTERISTICS: Mean annual soil temperatwe is 39 degrees F., and mean
summer soil temperature ranges from 55 to 59 degrees F. Exchangeable sodium ranges from 0 to
15 percent in the control section. The solum is calcazeous in some pedons. Depth to the
paralithic contact ranges from 20 to 40 inches. The particle size control section is typically clay
but averages 35 to 60 percent clay, 15 to 45 percent silt, and 15 to 45 percent sand with more
than 15 percent fine or coarser sand. Rock fragments range from 0 to 15 percent in the major
part of the control section and are mainly 0 to ] 0 inches in diameter. In some pedons
subhorizons redder than 7.SYR occur, but a major part of the solum and C horizons above the
bedrock has hue of 7.SYR or yellower. Mottling ranges from none to few faint mottles. These
soils crack widely on drying and have a high shrink-swell potential.
The A horizon has hue of SY through 7.SYR, value of 5 or 6 dry, and 3 or 4 moist, with chroma
of 2 through 4. It is neutral or mildly alkaline.

Habitat Management, Inc. A3-1 01/06/04