LOCATION TUMAC WA
Established Series
Rev. TJJ/TLA/TDT
09/2019
TUMAC SERIES
Landscape--mountains, plateaus
Landform--mountain slopes, structural benches
Slope--2 to 65 percent
Parent material--colluvium derived from basalt and andesite mixed with volcanic ash
Mean annual precipitation--about 1150 mm
Mean annual air temperature--about 6 degrees C
Depth class--very deep
Drainage class--well drained
Soil moisture regime--xeric
Soil temperature regime--frigid
Soil moisture subclass--typic
TAXONOMIC CLASS: Ashy-skeletal, mixed, frigid Humic Vitrixerands
TYPICAL PEDON: Tumac stony ashy sandy loam, forested
Oe--0 to 5 cm; moderately decomposed forest litter
A1--5 to 15 cm; stony ashy sandy loam, brown (10YR 5/3) dry, dark brown (10YR 3/3) moist; weak very fine granular structure; soft, very friable, nonsticky and nonplastic; weakly smeary; few very fine and common fine roots; 20 percent gravel and 10 percent stones; moderately acid (pH 6.0); abrupt smooth boundary
A2--15 to 43 cm; very gravelly ashy loam, brown (10YR 5/3) dry, dark brown (10YR 3/3) moist; moderate fine granular structure; soft, very friable, slightly sticky and slightly plastic; weakly smeary; common very fine, fine, and medium roots; 40 percent gravel; moderately acid (pH 5.8); abrupt wavy boundary
Bw1--43 to 81 cm; very gravelly ashy loam, yellowish brown (10YR 5/4) dry, dark brown (7.5YR 3/4) moist; common very fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; weakly smeary; few very fine and common fine roots; 45 percent gravel and 5 percent cobbles; moderately acid (pH 5.8); clear wavy boundary
Bw2--81 to 132 cm; extremely gravelly ashy loam, yellowish brown (10YR 5/4) dry, dark yellowish brown (10YR 3/4) moist; common fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; weakly smeary; few fine roots; 55 percent gravel and 10 percent cobbles; moderately acid (pH 6.0); clear wavy boundary
Bw3--132 to 157 cm; extremely gravelly ashy loam, strong brown (7.5YR 5/6) dry, dark yellowish brown (10YR 3/6) moist; common very fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; weakly smeary; 60 percent gravel and 5 percent cobbles; moderately acid (pH 5.8)
TYPE LOCATION: Yakima County, Washington; about 19 km south of the Rimrock Lake spillway; about 60 m east and 30 m south of the northwest corner of section 27, T. 12 N., R. 12 E., Willamette Meridian
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--7 to 8 degrees C
Soil moisture control section--usually moist, but dry in all parts 60 to 75 consecutive days following summer solstice
Thickness of umbric epipedon--25 to 38 cm
Average rock fragment content in particle-size control section--35 to 70 percent gravel and cobbles
Reaction--5.6 to 7.3 throughout
0- to 100-cm particle-size control section
*Moist bulk density--0.60 to 0.90 g/cm3
*Volcanic glass content--5 to 30 percent
*Acid oxalate aluminum plus one-half iron--2 to 3 percent
*Phosphorus retention--85 to 98 percent
*15-bar water retention--8 to 12 percent
Oe horizon
Thickness--3 to 5 cm
A horizon
Hue--10YR to 5YR
Value--3 to 5 dry, 2 or 3 moist
Chroma--2 or 3 dry or moist
Texture--stony ashy sandy loam, very stony ashy sandy loam, gravelly ashy sandy loam, very gravelly ashy loam
Combined thickness--25 to 38 cm
Bw horizon
Hue--7.5YR, 10YR
Value--5 or 6 dry, 3 or 4 moist
Chroma--3 to 6 moist
Texture--extremely gravelly ashy sandy loam, very gravelly ashy sandy loam, very gravelly ashy loam, extremely gravelly ashy loam, very cobbly ashy sandy loam, extremely stony ashy loam, extremely stony ashy sandy loam, extremely cobbly ashy loam, extremely cobbly ashy sandy loam, extremely cobbly ashy fine sandy loam
Combined thickness--greater than 107 cm
COMPETING SERIES:
Badgerwash--50 to 100 cm (moderately deep) to a duripan
Kaat--dry 45 to 60 days following summer solstice
Nankwala--50 to 100 cm (moderately deep) to a lithic contact (basalt)
Slicklog--mollic epipedon; dry 45 to 60 days following summer solstice
GEOGRAPHIC SETTING:
Elevation--610 to 1575 m; highest elevations on south-facing slopes
Climate--warm, dry summers; cool, moist winters
Mean annual precipitation--760 to 1525 mm
Mean January air temperature--about -4 degrees C
Mean July air temperature--about 19 degrees C
Mean annual air temperature--about 6 to 7 degrees C
Frost-free season--70 to 100 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Loneridge--clayey-skeletal particle-size class; argillic horizon; on mountain side slopes, summits, and benches
Naxing--cryic soil temperature regime; on mountain side slopes, summits, and benches
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturated hydraulic conductivity (Ksat)--high
USE AND VEGETATION:
Use--timber production, livestock grazing, recreation, wildlife habitat, watershed
Native vegetation--mainly Douglas-fir and ponderosa pine, some lodgepole pine and western larch, elk sedge, pinegrass, creambush oceanspray, lupine, snowbrush ceanothus, Idaho fescue, Oregon grape
DISTRIBUTION AND EXTENT: South-central Washington; MLRA 6; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Yakima County, Washington; 1979
REMARKS:
Diagnostic horizon and other features recognized in this pedon
*Umbric epipedon--zone from 5 to 43 cm
*Cambic horizon--zone from 43 to 157 cm
*Andic soil properties--zone from 5 to 157 cm
*Particle-size control section--zone from 5 to 105 cm
National Cooperative Soil Survey
U.S.A.