LOCATION IMURUK                  AK

Established Series
Rev. MHC/DLM
05/2022

IMURUK SERIES

Depth class: very deep
Drainage class: somewhat excessively drained
Landforms: hills, outwash plains
Parent material: silty eolian deposits over gravelly outwash
Elevation: 404 to 778 feet
Slope: 0 to 30 percent
Annual precipitation: 22 to 29 inches
Annual temperature: 24.8 degrees F
Frost-free period: 60 to 90 days

TAXONOMIC CLASS: Sandy-skeletal, mixed, subgelic Typic Haplogelods

TYPICAL PEDON: Imuruk silt loam - on a slope of 28 percent under ericaceous shrub/lichen dwarf scrub. (All colors are for moist soil)

Oi--0 to 1 inches; very dusky red (2.5YR 2.5/2) slightly decomposed plant material; many very fine and fine and few medium roots; extremely acid (pH 3.9); abrupt smooth boundary.

E--1 to 2 inches; dark reddish brown (5YR 3/2) silt loam; very friable, nonsticky and nonplastic; many very fine and fine and few medium roots; 2 percent gravel; very strongly acid (pH 4.6); abrupt wavy boundary.

2Bs--2 to 7 inches; dark reddish brown (2.5YR 3/4) and reddish brown (5YR 4/4) gravelly loamy coarse sand; loose, nonsticky and nonplastic; common very fine and fine roots; 15 percent gravel; strongly acid (pH 5.4); clear wavy boundary.

2BC--7 to 18 inches; dark yellowish brown (10YR 4/4) very cobbly coarse sand; loose, nonsticky and nonplastic; common very fine and fine roots; 30 percent gravel, 20 percent cobbles; strongly acid (pH 5.4); gradual smooth boundary.

2C1--18 to 28 inches; brown (10YR 4/3) very cobbly coarse sand; loose, nonsticky and nonplastic; few very fine and fine roots; 30 percent gravel, 20 percent cobbles; moderately acid (pH 5.8); diffuse smooth boundary.

2C2--28 to 60 inches; brown (10YR 4/3) very cobbly coarse sand; loose, nonsticky and nonplastic; 30 percent gravel, 20 percent cobbles; moderately acid (pH 5.8).

TYPE LOCATION: Steward River Training Site Area, Alaska; UTM coordinates: Zone 3, Easting 469984, Northing 7189250

RANGE IN CHARACTERISTICS:
Soil moisture class: udic
Average annual soil temperature: about 29 degrees F
Mean summer soil temperature: about 35 degrees F.
Depth to strongly contrasting textural stratification: 2 to 11 inches

Oi horizon:
Hue: 2.5YR to 7.5YR
Value: 2 to 3
Chroma: 2 to 4
Organic matter content: 65 to 90 percent
Reaction: ultra acid to very strongly acid

A horizon:
Value: 2 or 3
Chroma: 2 or 3
Clay content: 0 to 10 percent
Silt content: 55 to 75 percent
Sand content: 15 to 35 percent
Organic matter content: 2 to 4 percent
Rock fragments: 0 to 5 percent rounded indurated gravel, 0 to 2 percent rounded indurated cobbles
Reaction: extremely acid to strongly acid

E horizon:
Hue: 5YR, to 10YR
Value: 4 or 5
Chroma: 2 or 3
Clay content: 0 to 10 percent
Silt content: 55 to 75 percent
Sand content: 15 to 35 percent
Organic matter content: 2 to 4 percent
Rock fragments: 0 to 5 percent rounded indurated gravel, 0 to 2 percent rounded indurated cobbles
Reaction: extremely acid to strongly acid

2Bs, 2BC horizon:
Hue: 2.5YR to 7.5YR
Value: 3 or 4
Chroma: 4 to 6
Texture: very cobbly coarse sand, very gravelly coarse loamy sand, extremely gravelly coarse sand, gravelly loamy sand
Clay content: 0 to 5 percent
Silt content: 0 to 15 percent
Sand content: 80 to 95 percent
Organic matter content: 0 to 2 percent
Rock fragments: 20 to 50 percent rounded indurated gravel, 10 to 35 percent rounded indurated cobbles
Reaction: very strongly acid to moderately acid

2C horizon:
Hue: variegated, 10YR or 2.5Y
Value: 3 or 4
Chroma: 1 to 3
Texture: very cobbly coarse sand, very gravelly coarse sand, extremely gravelly coarse sand
Clay content: 0 to 5 percent
Silt content: 0 to 15 percent
Sand content: 80 to 95 percent
Rock fragments: 20 to 50 percent rounded indurated gravel, 10 to 35 percent rounded indurated cobbles
Reaction: strongly acid to moderately acid

COMPETING SERIES: This is the Schleyer series. Schleyer soils have a mean summer soil temperature warmer than 36 degrees F.

GEOGRAPHIC SETTING:
Landforms: hills, outwash plains
Parent material: silty eolian deposits over gravelly outwash
Elevation: 404 to 778 feet
Slope: 0 to 30 percent
Annual precipitation: 22 to 29 inches
Annual temperature: 24.8 degrees F
Frost-free period: 60 to 90 days

GEOGRAPHICALLY ASSOCIATED SOILS: These include Dirrant, Kuzitrin, and Tisuk soils. Dirrant soils are very poorly drained, shallow to permafrost, and occur on till plains. Kuzitrin soils are somewhat poorly drained, very deep, and occur on swales on mountains and swales on till plains. Tisuk soils are well drained, very deep, and occur on mountains, hills, and till plains.

DRAINAGE AND PERMEABILITY: Somewhat excessive drained, high runoff. Saturated hydraulic conductivity is moderately high to high in the loess mantle and high to very high in the gravelly outwash.

USE AND VEGETATION: Used for military use and wildlife habitat. Native vegetation is ericaceous shrub/lichen dwarf scrub.

DISTRIBUTION AND EXTENT: MLRA 240, Nulato Hills-Southern Seward Peninsula Highlands, Alaska. The series is of small extent.

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: WASILLA, ALASKA

SERIES ESTABLISHED: Steward River Training Site, Alaska, 2005

REMARKS: Diagnostic features and horizons recognized in this profile include:
Albic horizon: 0.5 to 2 inches. (E horizon)
Spodic horizon: 2 to 7 inches. (2Bs horizon)
Sandy-skeletal particle size control section: 10 to 40 inches
Temperature regime: cryic.

ADDITIONAL DATA:

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National Cooperative Soil Survey
U.S.A.