LOCATION HOLLENBECK CAEstablished Series
TAXONOMIC CLASS: Fine, smectitic, thermic Chromic Haploxererts
TYPICAL PEDON: Hollenbeck silty clay - on a 1 percent slope in a fallow dry bean field at an elevation of 70 feet. (Colors are for dry soil unless otherwise stated. When described on October 28, 1980, the soil was moist throughout).
Ap--0 to 10 inches; dark grayish brown (10YR 4/2) silty clay, very dark grayish brown (10YR 3/2) moist; strong medium subangular blocky structure; extremely hard, very firm, very sticky and very plastic; common very fine roots; common very fine tubular pores; neutral (pH 7.0); abrupt smooth boundary. (8 to 11 inches thick).
Bss1--10 to 27 inches; brown (10YR 4/3) clay, very dark grayish brown (10YR 3/2) moist; moderate very coarse angular blocky structure; extremely hard, very firm, very sticky and very plastic; common very fine roots; common very fine tubular pores; many intersecting slickensides and wedge shaped aggregates; neutral (pH 7.0); gradual wavy boundary. (17 to 30 inches thick).
Bss2--27 to 37 inches; brown (10YR 4/3) clay, dark brown (10YR 3/3) moist; moderate coarse angular blocky structure; extremely hard, very firm, very sticky and very plastic; few fine roots; few very fine tubular pores; many intersecting slickensides and wedge shaped aggregates; few fine manganese concretions; mildly alkaline (pH 8.5); clear wavy boundary. (10 to 15 inches thick).
Bk--37 to 42 inches; grayish brown (10YR 5/2) silty clay loam, brown (10YR 4/3) moist; moderate coarse angular blocky structure; hard, firm, sticky and plastic; few very fine tubular pores; strongly effervescent with common fine rounded soft masses of lime; moderately alkaline (pH 8.0); abrupt smooth boundary. (5 to 14 inches thick).
Bkqm--42 to 60 inches; light yellowish brown (10YR 6/4) strongly cemented duripan, brown (10YR 4/3) moist; massive; brittle; continuous indurated laminar capping 1 to 2 mm thick; strongly effervescent with many fine soft masses of lime.
TYPE LOCATION: San Joaquin County, California; about 5 miles southwest of Peters; about 40 feet east and 1280 feet north of the SW corner of section 16, T.1 N., R.8 E., MDB&M Peters quadrangle.
RANGE IN CHARACTERISTICS: Depth to duripan and combined thickness of the A, Bss and Bk horizons is 40 to 60 inches. The soils have 1 to 4 cm wide cracks that open and close at least once each year and remain open from June to October, unless irrigated. The mean annual soil temperature is estimated to range from 62 degrees to 63 degrees F. Manganese concretions and stains are few to common below the Ap.
The A and Bss horizons are 10YR 5/2, 4/2, 4/3, 3/2; 7.5Y 5/2, 4/2 and moist colors is 10YR 3/2, 3/3; or 7.5YR 3/2. They are clay, silty clay, or silty clay loam. Reaction is neutral to moderately alkaline.
The Bk horizon is 10YR 4/2, 4/3, 4/4, 5/2, 5/3; 7.5Y 4/4 and moist color is 10YR 3/2, 3/3, 4/3; or 7.5YR 3/4. It is silty clay loam or clay loam. Reaction is neutral to moderately alkaline. Lime is in concretions or soft masses.
The Bkqm horizon is 10YR 4/3, 4/4, 5/3, 5/4 or 6/4 and moist color is 10YR 4/2, 4/3, or 5/2.
COMPETING SERIES: These are the Alo, Altamont, Asbill, Asolt, Auld, Ayar, Capay, Centerville, Chinapoint (T), Cibo, Galt, Lostpoint (T), Porterville and Seville series. Alo, Asbill and Centerville soils have a paralithic contact at depths of less than 40 inches. Altamont soils are on complex slopes of more than 9 percent and have a paralithic contact at depths of more than 40 inches. Asolt soils have lithic contacts at depths of more than 40 inches. Auld soils have hue of 5YR or 2.5YR. Ayar soils are well drained and have slopes of more than 9 percent. Capay soils lack a duripan below 40 inches. Cibo soils have lithic contacts at depths of less than 40 inches. Porterville soils have hue of 5YR or 7.5YR. Galt and Seville soils have cemented pans at depths of less than 40 inches.
GEOGRAPHIC SETTING: Hollenbeck soils are on inter fan basins and basin rims at elevations of 20 to 125 feet. They formed in moderately fine and fine textured alluvium derived from mixed rock sources. Slopes are 0 to 3 percent. The soils are in a dry climate of relatively hot dry summers and cool moist winters. Dense ground fog often occurs during the winter months. Mean annual precipitation is 14 to 20 inches. Mean January temperature is 45 degrees F., mean July temperature is 77 degrees F, mean annual temperature is 60 to 63 degrees F. Frost-free season is 260 to 290 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Cogna (T), Galt and Stockton (T) soils. Cogna soils are fine-silty. Galt soils have a duripan at depths less than 40 inches. Stockton soils are on lower positions and have chroma of less than 1.5.
DRAINAGE AND PERMEABILITY: Moderately well drained; slow or slow runoff; slow permeability.
USE AND VEGETATION: Used for growing irrigated crops such as tomatoes, sugar beets, beans or grain sorghum, dry farmed to small grains, and irrigated pasture. Native vegetation is annual grasses and forbs with a few scattered California White Oaks.
DISTRIBUTION AND EXTENT: Northeastern San Joaquin Valley. The soil is moderately extensive in MLRA-17.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES PROPOSED: San Joaquin County, California, 1989.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - the zone from the surface to a depth of 27 inches (Ap, A horizons).
Duripan - the zone from a depth of 42 to 60 inches (Bkqm horizon).
Particle size control section - the zone from 10 to 40 inches.
Series reclassified on June 1996. Competing series not reviewed at that time.