LOCATION BOGACHIEL WAEstablished Series
TAXONOMIC CLASS: Sandy-skeletal, isotic, mesic Typic Udivitrands
TYPICAL PEDON: Bogachiel extremely gravelly medial sandy loam-forestland, on a 1 percent slope at an elevation of 900 feet in a western hemlock/salal-swordfern plant association. (When described on November 11, 1994, the soil was moist throughout. Colors are for moist soil unless otherwise
stated.)
Oi--0 to 2 inches; slightly decomposed needles, leaves, twigs, and other woody fragments; abrupt smooth boundary. (0 to 3 inches thick)
A--2 to 6 inches; dark brown (10YR 3/3) extremely gravelly medial sandy loam, dark brown (10YR 4/3) dry; weak very fine and fine granular and weak very fine subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; weakly smeary; common very fine, fine, medium, and coarse roots; common very fine and fine irregular pores; 60 percent gravel, 5 percent cobbles; moderately acid (pH 5.6); clear smooth boundary. (3 to 5 inches thick)
Bw1--6 to 14 inches; dark yellowish brown (10YR 3/4) extremely gravelly medial sandy loam, yellowish brown (10YR 5/4) dry; weak very fine subangular blocky and weak very fine and fine granular structure; slightly hard, friable, nonsticky and nonplastic; weakly smeary; common very fine, fine, medium, and coarse roots; common very fine and fine irregular pores; 55 percent gravel, 10 percent cobbles, moderately acid (pH 5.8); clar wavy boundary.
Bw2--14 to 21 inches; dark yellowish brown (10YR 3/6) extremely gravelly medial loam, yellowish brown (10YR 5/6) dry; weak very fine subangular blocky and weak very fine and fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; weakly smeary; common very fine and fine and few medium and coarse roots; common very fine and fine tubular and irregular pores; 55 percent gravel, 15 percent cobbles; moderately acid (pH 6.0); clear wavy boundary. (Combined thickness of the Bw horizons is 11 to 15 inches.)
C1--21 to 28 inches; dark yellowish brown (10YR 3/6) extremely gravelly loamy sand, brownish yellow (10YR 6/6) dry; massive; soft, very friable, nonsticky and nonplastic; few very fine and fine roots; few very fine irregular pores; 55 percent gravel, 20 percent cobbles; moderately acid (pH 6.0); clear wavy boundary. (6 to 12 inches thick)
C2--28 to 62 inches; dark yellowish brown (10YR 3/6) extremely gravelly sand, light yellowish brown (10YR 6/4) dry; single grain; loose, nonsticky and nonplastic; 60 percent gravel, 20 percent cobbles; moderately acid (pH 6.0).
TYPE LOCATION: Clallam County, Washington, about 1.5 miles south of Kloshe Nanich, about 1275 feet west and 310 feet south of the northeast corner of Section 35, T. 30 N., R. 11 W. (Latitude 48 degrees, 03 minutes, 34 seconds N., Longitude 124 degrees, 04 minutes, 26 seconds W.)
RANGE IN CHARACTERISTICS: Mean annual soil temperature is 50 to 52 degrees F. These soils are usually moist, and are dry less than 45 consecutive days in the soil moisture control section; udic moisture regime. The particle-size control section has andic soil properties with a cumulative thickness of 14 to 20 inches and 50 to 90 percent rock fragments by volume. The andic soil material has an estimated moist bulk density of 0.80 to 0.90 g/cc, acid-oxalate extractable aluminum plus one half of the acid-oxalate extractable iron of 2 to 3 percent, phosphate retention of 85 to 100 percent, 15-bar water retention of 12 to 15 percent for air dried samples and 20 to 30 percent for moist samples. Acid oxalate extractable iron is 1.5 to 3.0 percent for the solum.
The A horizon has hue of 10YR, 7.5YR, or 5YR moist and dry, value of 3 or 4 moist and 4 through 6 dry, and chroma of 3 or 4 moist and dry. Reaction is strongly or moderately acid. It has 5 to 10 percent organic matter.
The Bw horizon has hue of 10YR or 7.5YR moist and dry, value of 3 or 4 moist and 5 through 7 dry, and chroma of 4 or 6 moist and dry. It is extremely gravelly medial sandy loam, extremely gravelly medial loam, or very gravelly medial sandy loam. It has 1 to 7 percent organic matter.
The C horizon has hue of 10YR or 2.5Y moist and dry, value of 3 or 4 moist and 5 or 6 dry, and chroma of 3, 4, or 6 moist. It is extremely gravely sand, extremely gravelly loamy sand, or extremely cobbly loamy sand. Reaction is moderately or slightly acid.
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Bogachiel soils are on glacial outwash terraces. Slopes are 1 to 5 percent. The soils formed in continental glacial outwash. Elevations are 900 to 1,200 feet. Average annual precipitation is 90 to 100 inches. Average annual temperature is 48 to 50 degrees F. The frost-free season is 160 to 180 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Ishmael, Nanich, and Solduc soils. All are on glacial outwash terraces. Ishmael soils have a medial-skeletal particle-size control section. Nanich and Solduc soils have an isomesic temperature regime.
DRAINAGE AND PERMEABILITY: Somewhat excessively drained; moderate over rapid permeability.
USE AND VEGETATION: Timber production, wildlife habitat, recreation, and watershed. Native vegetation is western hemlock, Douglas-fir, salal, western swordfern, red huckleberry, and northern twinflower.
DISTRIBUTION AND EXTENT: Clallam County, Washington; MLRA 1. Series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Clallam County, Washington, 2000; Olympic National Forest.
REMARKS: Diagnostic horizons and features recognized in this pedon are the following:
Ochric epipedon
Cambic horizon - 6 to 21 inches
Andic soil properties - 2 to 21 inches
PSCS - 2 to 42 inches (from 2 to 21 inches is medial-skeletal and ferrihydritic and from 21 to 42 inches is sandy-skeletal and isotic). The thickest part is the lower part.
All depths to diagnostic horizons and other features are measured from the top of the first mineral horizon.