LOCATION PIERVIEW                CA

Established Series
Rev. RLR/KP/GML/RLR
03/2017

PIERVIEW SERIES

The Pierview series are well drained soils that formed in alluvium weathered from slate and other sedimentary sources. Pierview soils are on remnant alluvial fans and terraces, often in urban areas where surface modification is common. Slopes range from 0 to 12 percent. The mean annual precipitation is about 410 millimeters and the mean annual temperature is about 18 degrees C.

TAXONOMIC CLASS: Fine-loamy, mixed, superactive, thermic Haplic Palexeralfs

TYPICAL PEDON: Pierview loam, on a city park lawn at an elevation of 63 meters. When described the soil was moist at the surface and dry in the subsurface. (Colors are for dry soil unless otherwise noted).

^A--0 to 6 centimeters; brown (7.5YR 5/3) loam, dark brown (7.5YR 3/2) moist; weak coarse subangular blocky structure; hard, friable, moderately sticky and moderately plastic; common very fine roots; common fine tubular pores; slightly alkaline (pH 7.5). (5 to 55 cm thick)

^Cu--6 to 28 centimeters; light brown (7.5YR 6/3) loam, dark brown (7.5YR 3/3) moist; massive; very hard, friable, moderately sticky and moderately plastic; few very fine roots; few fine and very fine tubular pores; 2 percent gravel; 3 percent artifacts; slightly alkaline (pH 7.4). (0 to 40 cm thick)

2Bt1--28 to 90 centimeters; light brown 7.5YR (6/3) loam, brown (7.5YR 4/3) moist; weak medium subangular blocky structure; friable, moderately sticky and moderately plastic; few fine and very fine tubular pores; few distinct clay films on all faces of peds; 2 percent gravel; neutral (pH 7.0).

2Bt2--90 to 130 centimeters; dull brown (7.5YR 5/4) clay loam, brown (7.5YR 4/4) moist; moderate medium subangular blocky structure; firm moderately sticky, moderately plastic; common few very fine and fine tubular pores; common distinct clay films on all faces of peds; 2 percent gravel; neutral (pH 7.0).

2Bt3--130 to 170 centimeters; dull yellowish brown (10YR 5/4) clay loam, dark yellowish brown (10YR 4/4) moist; moderate medium subangular blocky structure; firm, moderately sticky and moderately plastic; common very fine tubular pores; common distinct clay films on all faces of peds; 5 percent gravel; neutral (pH 7.0).

2Bt4--170 to 185 centimeters; dull yellowish brown (10YR 5/4) loam, dark yellowish brown (10YR 4/4) moist; weak medium subangular blocky structure; friable, moderately sticky and moderately plastic; common very fine tubular pores; few distinct clay films on all faces of peds; neutral (pH 7.1). (Combined thickness of the Bt horizons is 115 to 178 cm thick)

TYPE LOCATION: Los Angeles County, California, Douglass Park, Santa Monica, CA, 34 degrees, 2 minutes, 8 seconds North latitude and 118 degrees, 28 minutes, 48 seconds West longitude, WGS84 - U.S.G.S Quad: Beverly Hills

RANGE IN CHARACTERISTICS:

Soil moisture: The soil becomes moist below a depth of about 30 cm some time from October to December and remains moist in some part between depths of about 30 to 90 cm until April or May. It is dry the rest of the year.
Mean annual soil temperature: 17 to 20 degrees C. The soil temperature usually does not go below 8 degrees C.

Rock fragments: 0 to 15 percent gravel throughout.
Reaction: neutral or moderately alkaline.

Clay Content: 18 to 35 percent and no clay decrease of 20 percent or more (relative) from the maximum clay content within 150 cm of the mineral soil surface.

A, ^A(u) horizons:
Dry Color: hue of 10YR or 7.5YR, value of 4 or 5, chroma of 2 or 3
Moist Color: hue of 10YR or 7.5YR, value of 2 to 4, chroma of 2 or 3
Texture: loam, fine sandy loam or silt loam
Rock fragment: 0 to 15 percent gravel
Artifacts: 0 to 10 percent variable construction debris

^C(u) horizons:
Dry Color: hue of 10YR or 7.5YR, value of 4 to 6, chroma of 3 to 6
Moist Color: hue of 10YR or 7.5YR, value of 3 to 5, chroma of 3 to 6
Texture - loam, clay loam, fine sandy loam
Rock fragment: 0 to 15 percent gravel
Artifacts: 0 to 10 percent variable construction debris

2Bt, Btk horizons:
Dry Color: hue of 10YR or 7.5YR, value of 4 to 6, chroma of 3 to 6
Moist Color: hue of 10YR or 7.5YR, value of 3 to 5, chroma of 3 to 6
Texture: loam, clay loam or silty clay loam. Some pedons have clay below the control section
Rock fragment: 0 to 15 percent gravel. Some pedons have a gravelly substratum.

(2)BC horizons: (where present)
Moist Color: hue of 10YR or 7.5YR, value of 4 to 6, chroma of 4 or 6
Texture: loam or clay loam
Rock fragment: 0 to 15 percent gravel. Some pedons are gravelly in the substratum at a depth typically greater than 150 cm.

COMPETING SERIES:This would be the Slideland soil.
Slideland series: have cobbles and stones in the lower argillic horizons and have more than 762 mm of precipitation annually with 160 to 215 frost-free days.

GEOGRAPHIC SETTING:
Landform: highly weathered alluvial fan remnants.
Slopes: 0 to 12 percent and may be modified with construction equipment. Parent material: alluvium weathered from slate and other related sedimentary sources underlying a thin discontinuous layer of human-transported materials at the surface.
Elevation: 0 to 250 meters.
Mean annual precipitation: 300 to 520 millimeters.
Mean annual temperature is 16 to 19 degrees C.
Frost-free season: 320 to 365 days.

GEOGRAPHICALLY ASSOCIATED SOILS:
Grommet soils: are on slightly lower alluvial fans and do not have an argillic horizon.
Montebello soils: have greater than 50 cm of human-transported materials and are formed in material that originates from alluvium weathered from granitic sources.
Myford soils: have a clay increase of 18 to 28 percent, exchangeable sodium percentage of 15 to 35 percent below 100 cm and are on terraces.
Palmview soils: have less than 18 percent clay on low lying alluvial fans.
Pleasanton soils: have a 20 percent or greater clay decrease within 150 cm of the mineral soil surface on similar landforms.
Sorrento soils: have a mollic epipedon, do not have an argillic horizon and are on alluvial aprons and fans.
Windfetch soils: have a mollic epipedon and are on uplifted alluvium and terraces.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained; low and medium runoff. Saturated hydraulic conductivity is moderate in the upper part and moderately slow in the lower part.

USE AND VEGETATION: Pierview soils are used for cultivation of truck crops, orchards and urban residential or commercial development.

DISTRIBUTION AND EXTENT: The Pierview soils are of moderate extent and are mapped in MLRA 19 - Southern California Coastal Plain.

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Davis, California.

SERIES ESTABLISHED: Los Angeles County, Southeastern Part, California, 2015.

REMARKS:

Some pedons have a lithologic discontinuity and rock fragment percentages of 15 to 35 percent in the subsurface near Santa Monica.

Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - the zone from a depth of 0 to 6 cm
Human-transported materials - the zone from a depth of 0 to 28 cm
Artifacts - the zone from a depth of 6 to 28 cm
Argillic horizon - the zone from a depth of 90 to 185 cm
Particle Size Control - the zone from a depth of 90 to 130 cm

ADDITIONAL DATA:

User Pedon ID: 2014CA696952
Classified using the Twelfth Edition Keys to Soil Taxonomy (2014)

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National Cooperative Soil Survey
U.S.A.