LOCATION HAVA WAEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, isotic, mesic Andic Oxyaquic Dystrudepts
TYPICAL PEDON: Hava extremely gravelly medial sandy loam-forestland, on a 30 percent north-northeasterly aspect at an elevation of 760 feet in a western hemlock/Oregon-grape-swordfern plant association. (When described on October 17, 1994, the soil was dry throughout. Colors are for moist soil unless otherwise stated.)
Oi--0 to 2 inches; slightly decomposed needles, leaves, twigs, and cone fragments; abrupt smooth boundary. (1 to 3 inches thick)
Oe--2 to 3 inches; moderately decomposed organic materials; abrupt smooth boundary. (0.5 to 1.5 inches thick)
A--3 to 9 inches; dark yellowish brown (10YR 3/4) extremely gravelly medial sandy loam, yellowish brown (10YR 5/4) dry; weak very fine and fine subangular blocky and weak very fine and fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; weakly smeary; many very fine, fine, medium, and coarse roots; many very fine and fine irregular pores; 50 percent gravel, 15 percent cobbles; moderately acid (pH 6.0); clear smooth boundary. (5 to 7 inches thick)
Bw1--9 to 16 inches; strong brown (7.5YR 4/6) extremely gravelly medial sandy loam, reddish yellow (7.5YR 6/6) dry; weak very fine and fine subangular blocky and weak very fine and fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; weakly smeary; many very fine and fine and common medium and coarse roots; many very fine and fine irregular pores; 45 percent gravel, 20 percent cobbles; moderately acid (pH 6.0); clear wavy boundary.(3 to 13 inches thick)
Bw2--16 to 24 inches; dark yellowish brown (10YR 3/6) extremely gravelly sandy loam, brownish yellow (10YR 6/6) dry; weak very fine and fine subangular blocky and weak very fine and fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine and common fine, medium, and coarse roots; common very fine and fine irregular pores; 50 percent gravel 20 percent cobbles; moderately acid (pH 6.0); clear wavy boundary. (8 to 16 inches thick)
BC--24 to 45 inches; olive brown (2.5Y 4/4) extremely cobbly sandy loam, light yellowish brown (2.5Y 6/4) dry; weak very fine and fine subangular blocky and weak very fine and fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine, fine, medium, and coarse roots; common very fine and fine irregular pores; 30 percent gravel, 30 percent cobbles, and 15 percent stones; slightly acid (pH 6.2); abrupt wavy boundary. (20 to 24 inches thick)
Cdt--45 to 63 inches; olive brown (2.5Y 4/4) extremely gravelly sandy loam, light yellowish brown (2.5Y 6/4) dry; massive; hard, brittle, slightly sticky and slightly plastic; common distinct dark brown (7.5Y 4/4) clay films on the upper surface of the dense layer; few fine faint olive brown (2.5Y 4/3) iron depletions on ped faces; 50 percent gravel, 15 percent cobbles; slightly acid (pH 6.4). (20 inches to many feet thick)
TYPE LOCATION: Clallam County, Washington, about 2 1/3 miles east of McDonald Mountain, about 2,290 feet west and 1,585 feet south of the northeast corner of Section 36, T. 30 N., R. 7 W. (Latitude 48 degrees, 03 minutes, 11 seconds N., Longitude 123 degrees, 30 minutes, 42 seconds W.)
RANGE IN CHARACTERISTICS: Mean annual soil temperature is 50 to 52 degrees F. These soils are usually moist, and are dry 30 to 45 consecutive days in the soil moisture control section. Depth to dense till is 40 to 60 inches. The upper 7 to 20 inches of the solum has a moist bulk density of 0.90 to 1.00 g/cc and acid oxalate extractable aluminum plus one-half iron percentages of 1.0 and 2.0 percent. The particle-size control section has 50 to 85 percent rock fragments by volume, and greater than 60 percent sand. Depth to a perched water table is 30 to 40 inches and is present for over 30 cumulative days (Oxyaquic). Base saturation is 35 to 50 percent throughout the solum.
The A horizon has hue of 10YR or 7.5YR moist and dry, value of 3 or 4 moist and 5 or 6 dry, and chroma of 3 or 4 moist. It has 4 to 7 percent organic matter.
The Bw horizon has hue of 7.5YR or 10YR moist and dry, value of 3 or 4 moist, and chroma of 4 or 6 moist. It is extremely gravelly sandy loam, extremely cobbly sandy loam, or very gravelly sandy loam. It has 1 to 6 percent organic matter. It has 10 to 18 percent clay.
The BC horizon has hue of 2.5Y or 10YR moist and dry and chroma of 3 or 4 moist and 4 or 6 dry. It is extremely cobbly sandy loam, extremely gravelly sandy loam, or extremely gravelly loamy sand. It has 5 to 15 percent clay.
The Cd horizon has hue of 2.5Y or 5Y moist and dry and chroma of 3 or 4 moist. It is extremely gravelly sandy loam or extremely gravelly loamy sand. Moist bulk density is 1.50 to 2.00 g/cc.
COMPETING SERIES: These are the Aschoff, Damewood, Hoodview, Indianpass, Ketland, Nicklund, Nordby and Sahalie series. Aschoff soils have a umbric epipedon and lack the densic material. Damewood and Indianpas soils are 20 to 40 inches to bedrock. Hoodview and Nordby soils are over 60 inches deep. Ketland soils are on mountain slopes and have less than 60 percent sand in the particle-size control section. Nicklund soils are 20 to 40 inches to densic material. Sahalie soils are on mountains and lack the densic material.
GEOGRAPHIC SETTING: Hava soils are on ground moraines. Slopes are 10 to 40 percent. The soils formed in continental glacial till. Elevations are 900 to 1,700 feet. Average annual precipitation is 45 to 55 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 Stormking, and Wyecreek soils. Stormking soils are on mountain slopes. Wyecreek soils are predominantly on mountain headwalls and glaciated mountain slopes. Stormking, and Wyecreek soils are well drained.
DRAINAGE AND PERMEABILITY: Moderately well drained; moderately rapid over slow permeability. Hava soils have a perched zone of saturation above the dense till from November through April.
USE AND VEGETATION: Timber production, wildlife habitat, recreation, and watershed. Native vegetation is Douglas-fir, western hemlock, western redcedar, grand fir, western swordfern, Oregon-grape, salal, northern twinflower, starflower, and sweetscented bedstraw.
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 - 9 to 45 inches (Bw1, Bw2, and BC subhorizons)
Densic contact - 45 to 63 inches (Cd layer)
PSCS - 13 to 43 inches (Bw1, Bw2, and BC subhorizons)
Oxyaquic subgroup criteria is met.
All depths to diagnostic horizon and other features are measured from the top of the first mineral horizon.