LOCATION EGTUK                   AK

Established Series
SAS/TJR/SJN
02/2022

EGTUK SERIES

The Egtuk series consists of very deep, poorly drained soils formed in eolian deposits on plain talfs. Slopes range from 1 to 5 percent. Mean annual precipitation is about 750 millimeters and the mean annual air temperature is about 0.6 degrees C.

TAXONOMIC CLASS: Coarse-loamy, isotic Oxyaquic Dystrocryepts

TYPICAL PEDON: Egtuk highly organic very fine sandy loam located on a plain with a slope of 5 percent and elevation of 40 meters; when described on August 1st, 2006 the soil was moist from 0 to 25 cm and wet throughout the rest of the profile (Colors are for moist soil unless otherwise noted)

Oe--0 to 2 centimeters; moderately decomposed plant material; many very fine and fine roots, common medium roots and few coarse roots; very strongly acid, pH 4.6; clear wavy boundary

A--2 to 4 centimeters; very dark gray (7.5YR 3/1) highly organic very fine sandy loam; 50 percent sand; 44 percent silt; 6 percent clay; weak fine granular structure; friable, nonsticky, nonplastic; many very fine and fine roots, many medium roots, and few coarse roots; moderately acid, pH 5.6; abrupt wavy boundary

Bw--4 to 25 centimeters; brown (10YR 4/3) very fine sandy loam; 50 percent sand; 45 percent silt; 5 percent clay; moderate medium subangular blocky structure; friable, nonsticky, nonplastic; common very fine and fine roots, common medium roots, and few coarse roots; moderately acid, pH 5.6; gradual wavy boundary

C--25 to 183 centimeters; dark yellowish brown (10YR 4/4) very fine sandy loam; 50 percent sand; 45 percent silt; 5 percent clay; massive; nonsticky, nonplastic; common very fine and fine roots, common medium roots, and few coarse roots; moderately acid, pH 5.6

TYPE LOCATION: Dillingham Census Area, Alaska. 3 kilometers north-northwest of the Village of Ekwok, Alaska; 59.3736111 degrees north latitude, 157.4605556 degrees west longitude.

RANGE IN CHARACTERISTICS:
Mean annual soil temperature - 0.6 to 1.8 degrees C (cryic soil temperature regime)
Soil moisture control section - Dry less than 45 consecutive days from June to October (udic soil moisture regime)
Thickness of ochric epipedon - 4 to 25 cm
Thickness of cambic horizon - 21 to 75 cm

All mineral horizons-
Reaction - 4.6 to 5.8

Particle-size control section-
Clay content - 4 to 7 percent
Rock fragments - 0 to 25 percent

Oe horizon
Thickness - 2 to 17 cm

A horizon
Hue - 7.5YR or 10YR
Value - 2 or 3
Chroma - 1 or 2
Fine earth texture - Highly organic very fine sandy loam or silt loam
Clay content - 4 to 8 percent
Reaction - 4.6 to 5.6
Rock fragments - 0 to 27 percent subangular channers
Thickness - 2 to 22 cm

Bw horizon
Hue - 10YR or 2.5Y
Value - 4 or 5
Chroma - 2 to 4
Fine earth texture - Very fine sandy loam or stratified silt loam
Clay content - 4 to 7 percent
Reaction - 4.9 to 5.8
Rock fragments - 0 to 12 percent subrounded gravels
Thickness - 21 to 75 cm

C horizon
Hue - 10YR or 2.5Y
Value - 4 or 5
Chroma - 4
Fine earth texture - Very fine sandy loam or silt loam
Clay content - 4 to 7 percent
Reaction - 4.6 to 5.6
Rock fragments - 0 to 25 percent subrounded gravels
Thickness - 83 to 158 cm

COMPETING SERIES: None

GEOGRAPHIC SETTING:
Parent material - Mossy organic material over coarse-loamy eolian deposits
Landform - Talfs on plains
Slope - 1 to 5 percent
Elevation - 10 to 113 meters
Climate - Cool summers; cold winters, August and September are the wettest months
Mean annual precipitation - 608 to 860 mm
Mean annual air temperature - 0.2 to 0.7 degrees C
Frost free duration - 85 to 140 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Klutuk - Well drained; rises and talfs on plains, and on hills
Pellernarquq - Very poorly drained; plain dips and talfs
Kumla - Permafrost; plain talfs
Kemuk - Poorly drained; plain talfs
Tunravik - Well drained; terrace treads

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: (Ksat)
Drainage class - Moderately well drained
Saturation in normal years - Within 100 cm of the soil surface
Ksat - Moderately high throughout the mineral soil material

USE AND VEGETATION:
Use - Wildlife habitat, subsistence hunting and berry picking
Potential natural vegetation - Western maritime ericaceous scrubland composed of labrador tea, dwarf birch, bog blueberry, lingonberry, crowberry, sedges, and lichens

DISTRIBUTION AND EXTENT: Bristol Bay Lowlands, Alaska; MLRA 236; small extent.

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

SERIES ESTABLISHED: Nushagak Mulchatna Watershed, Dillingham Census Area, Alaska, 2019

REMARKS:
Particle-size control section - 27 to 102 cm
Ochric epipedon
Soil moisture regime - Udic
Cambic horizon - Bw horizon

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National Cooperative Soil Survey
U.S.A.