LOCATION HARTILL                 WA

Established Series
Rev. NCD-BDJ-RJS
11/2015

HARTILL SERIES

The Hartill series consists of moderately deep, well drained soils that formed in colluvium over residuum derived from argillite, siltite, phyllite, graywacke, or quartzite with a mantle of volcanic ash. These soils are on ridges, shoulders, and backslopes of mountains. Slopes of 0 to 65 percent. The mean annual precipitation is about 575 mm, and the mean annual air temperature is about 6.7 degrees C.

TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, frigid Andic Haploxerepts

TYPICAL PEDON: Hartill ashy silt loam - woodland. (Colors are for dry soil unless otherwise noted.)

Oi--0 to 3 cm; needles, leaves, and twigs; slightly acid (pH 6.5). (0 to 5 cm thick)

Oe--3 to 5 cm; partially decomposed needles, leaves, and twigs; slightly acid (pH 6.5); abrupt smooth boundary. (0 to 3 cm thick)

E--5 to 6 cm; light gray (10YR 7/1) ashy very fine sandy loam, dark gray (10YR 4/1) moist; weak fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine and fine roots; many very fine and fine pores; neutral (pH 6.6); abrupt wavy boundary. (0 to 3 cm thick)

Bw1--6 to 23 cm; pale brown (10YR 6/3) ashy silt loam, brown (10YR 4/3) moist; weak fine and medium granular structure; soft, very friable, slightly sticky and nonplastic; many fine and medium and few coarse roots; many fine and medium pores; 5 percent channers; neutral (pH 6.6); clear wavy boundary. (10 to 20 cm thick)

Bw2--23 to 35 cm; pale brown (10YR 6/3) channery ashy silt loam, dark yellowish brown (10YR 4/4) moist; weak fine and medium subangular blocky structure; soft, very friable, slightly sticky and nonplastic; many fine and medium and few coarse roots; many fine and medium pores; 15 percent channers; slightly acid (pH 6.4); clear wavy boundary. (10 to 20 cm thick)

2Bw3--35 to 68 cm; very pale brown (10YR 7/4) channery loam, yellowish brown (10YR 5/4) moist; weak fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common fine and medium and few coarse roots; common fine and medium pores; 20 percent channers and 10 percent flagstone; slightly acid (pH 6.4); clear wavy boundary. (25 to 38 cm thick)

2C--68 to 99 cm; pale yellow (2.5Y 7/4) very channery loam, light olive brown (2.5Y 5/4) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; few fine and medium roots; few fine and medium pores; 40 percent channers and 10 percent flagstone; slightly acid (pH 6.4); clear wavy boundary. (25 to 38 cm thick)

2R--99 cm; fractured phyllite with fines in some voids.

TYPE LOCATION: Stevens County, Washington; 365 meters south and 550 meters west of the northeast corner of section 23, T. 30 N., R. 41 E., WM. Latitude - 48 degrees, 5 minutes, 18.32 seconds North, Longitude - 117 degrees, 35 minutes, 38.04 seconds West. USGS Deer Lake Quadrangle.

RANGE IN CHARACTERISTICS:
Depth to a lithic contact - 50 to 100 cm
Mean annual soil temperature - 6.0 to 8.0 degrees C
Soil moisture - usually moist in all horizons but is dry in all parts between depths of 10 to 30 cm for 45 to 60 consecutive days following the summer solstice
Volcanic ash layer
Thickness - 18 to 36 cm
Volcanic glass content - 30 to 60 percent
Bulk density - 0.65 to 0.85g/cc (estimated)
Acid-oxalate extractable Al + 1/2 Fe - 1.0 to 2.0 percent
15 bar water (air dried) - 5 to 12 percent
Rock fragments - average 35 to 50 percent in the particle-size control section

E horizon (where present):
Value - 6 or 7 dry, 4 to 6 moist
Chroma - 1 or 2 dry or moist
Texture - ashy silt loam, ashy loam , ashy very fine sandy loam
Clay content - 5 to 15 percent
Rock fragments - 0 to 15 percent channers
Reaction - 6.1 to 7.3
Note: The E horizon in this pedon is volcanic ash from Mount St. Helens. Mount St. Helens ash may be absent in some pedons.

Bw1, Bw2 horizons:
Hue - 10YR or 7.5YR
Value - 5 or 6 dry, 3 to 5 moist
Chroma - 2 to 4 moist, 3 or 4 dry
Textures - ashy silt loam or ashy loam
Rock fragments - 5 to 15 percent channers
Reaction - 6.1 to 7.3

2Bw3 horizon:
Hue - 10YR or 2.5Y
Value - 5 through 7 dry, 4 or 5 moist
Chroma - 3 or 4 moist or dry
Textures - loam or sandy loam
Rock fragments - 15 to 50 percent channers, 3 to 10 percent flagstones. 15 to 60 percent total rock fragment content
Reaction - 6.1 to 7.3


2C horizons:
Hue - 10YR or 2.5Y
Value - 6 or 7 dry, 4 through 6 moist
Chroma - 3 or 4, dry or moist
Textures - loam or sandy loam
Rock fragments - 25 to 50 percent channers, 5 to 25 percent flagstones, 35 to 60 percent total rock fragment content

COMPETING SERIES:
Belzar (WA) - are slightly alkaline or moderately alkaline in the 2C horizon
Kloochman (WA) - are dry for 60 to 75 consecutive days
Newbell (WA) - are very deep
Ohscow (WA) - are very deep
Talls (WA) - are very deep
Threemile (WA) - are deep to a lithic contact
Wilmont (WA) - are very deep

GEOGRAPHIC SETTING:
Landform - ridges, shoulders, and backslopes of mountains
Elevation - 600 to 1,475 meters
Slopes - 0 to 65 percent
Parent material - colluvium over residuum derived from argillite, siltite, phyllite, graywacke, or quartzite with a mantle of volcanic ash
Mean annual precipitation - 500 to 900 mm.
Mean annual air temperature - 3.8 to 7.8 degrees C.
Frost-free period - 90 to 120 days

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Aits, Elbowlake, Huckleberry, Nevine, and Raisio soils, and the competing Oxerine and Wilmont soils. Aits, Elbowlake, and Nevine soils are deeper than 150 cm to bedrock. In addition, Elbowlake and Nevine soils have a mantle of volcanic ash more than 36 cm thick. Huckleberry soils are cryic and medial over loamy-skeletal. Raisio soils have a mollic epipedon and are mesic.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained; moderately high saturated hydraulic conductivity.

USE AND VEGETATION: Used for timber production, grazing, wildlife habitat, and watershed. Some small areas are cleared and used for pasture and hay or dryland crops. The natural vegetation is Douglas-fir, ponderosa pine, western larch, and grand fir, with an understory of common snowberry, willow, huckleberry, redstem ceanothus, pinegrass, creambush oceanspray, white spirea, pachystima and rose.

DISTRIBUTION AND EXTENT: Northeastern Washington. The series is of moderate extent. MLRA 43A.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana

SERIES ESTABLISHED: Stevens County, Washington, l978.

REMARKS: Diagnostic horizons and features recognized in this pedon are: Ochric epipedon - from 0 to 6 cm (Oi, Oe, A horizons);
Cambic horizon - from 6 to 68 cm (Bw1, Bw2, 2Bw3 horizons);
Andic soil properties - from 5 to 35 cm (E, Bw1 and Bw2 horizons); and
Particle Size Control Section - from 30 to 99 cm (part of Bw2, 2Bw3, 2C horizons).

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National Cooperative Soil Survey
U.S.A.