LOCATION MONTEBELLO              CA

Established Series
RLR/MEB/GML/RLR
02/2017

MONTEBELLO SERIES

The Montebello series consists of very deep, well drained soils that are formed in human transported materials (HTM) on graded alluvial fans that originate from granitic sources. Slopes range from nearly level to 15 percent. The mean annual precipitation is about 445 mm and the mean annual temperature is about 18 degrees C.

TAXONOMIC CLASS: Fine-loamy, spolic, mixed, superactive, nonacid, thermic Typic Xerorthents

TYPICAL PEDON: Montebello silt loam, on a graded alluvial fan remnant. When described the soil was dry throughout. (Colors are for dry soil unless otherwise noted).

^A--0 to 9 cm; grayish brown (10YR 5/2) silt loam, very dark grayish brown (10YR 3/2) moist; moderate medium granular and moderate thin platy structure; soft, friable, slightly sticky and slightly plastic; common very fine and medium roots; common very fine and fine interstitial pores; neutral (pH 7.2); abrupt wavy boundary. (8 to 55 cm thick)

^C--9 to 87 cm; dark brown (7.5YR 3/3) clay loam, dark brown (7.5YR 3/3) moist, 10 percent strong brown(7.5YR 4/6) and 5 percent brown (10YR 5/3); massive; very hard, friable, slightly sticky and slightly plastic; common very fine roots throughout; few very fine interstitial pores; mixed matrix color; slightly alkaline (pH 7.4); abrupt smooth boundary. (67 to 195 cm thick)

2Bt1--87 to 135 cm; clay loam, dark brown (7.5YR 3/4) moist; weak medium subangular blocky structure; friable, moderately sticky and moderately plastic; common distinct clay films on surfaces along root channels; slightly alkaline (pH 7.8; clear wavy).

2Bt2--135 to 200 cm; clay loam, brown (7.5YR 4/4) moist; weak medium subangular blocky structure; common distinct clay films on faces of peds; slightly alkaline (pH 7.8). (Combined thickness of the 2Bt horizons is 0 to 125 cm thick)

TYPE LOCATION: Los Angeles County, CA, Northeast corner of Mills Park on Wheeler Road in La Verne, CA. 34 degrees, 8 minutes, 5 seconds North latitude and 117 degrees, 46 minutes, 30 seconds West longitude, NAD83 - U.S.G.S Quad: Glendora.

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 a depth 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.

Thickness of human transported materials: greater than 50 cm.
Reaction: Slightly acid to slightly alkaline and are typically non-effervescent. Some pedons have pulverized concrete mixed into HTM.
Clay content: 18 to 35 percent.

^A, ^Au horizon:
Dry color: hue of 10YR or 7.5YR, value of 3 to 5, chroma of 2 to 4
Moist color: hue of 10YR or 7.5YR, value of 2 to 4, chroma of 1 to 3
Texture: loam, silt loam, sandy loam, or fine sandy loam
Rock fragments: 0 to 15 percent
Artifacts: 0 to 10 percent

^C, ^Cu horizon:
Dry Color: hue of 10YR or 7.5YR, value of 3 to 5, chroma of 2 to 6
Moist Color: hue of 10YR or 7.5YR, value of 3 to 5, chroma of 3 to 6
Texture: clay loam, loam, sandy clay loam, sandy clay or sandy loam. Some pedons have coarser textured horizon and variable fragments.
Rock fragments: 0 to 15 percent; some pedons have up to 35 percent
Artifacts: 0 to 10 percent

2Bt horizon:
Dry color: hue of 10YR or 7.5YR, value of 3 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: clay loam, loam, sandy clay loam, or sandy loam
Rock fragments: 0 to 15 percent

2BC, 2C horizon: (where present)
Dry color: hue of 10YR or 7.5YR, value of 3 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, sandy clay loam, sandy loam or fine sandy loam
Rock fragments: 0 to 15 percent

COMPETING SERIES: There are no competing series.

GEOGRAPHIC SETTING:
Landscape: alluvial plain, coastal plain.
Landform: locally raised land, cut and filled terraces on existing alluvial fan remnants.
Parent material: human transported materials originating from and/or overlying old weathered alluvium from granitic sources.
Elevation: 10 to 625 meters.
Slope: 0 to 15 percent.
Mean January temperature: 13 degrees C.
Mean July temperature: 24 degrees C.
Mean annual precipitation: 320 to 650 mm.
Mean annual air temperature: 16 to 19 degrees C.
Frost free season: 300 to 365 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Botella, Cropley, Palmview, Pierview, Ramona, and Tujunga soils.
Botella soils: have an argillic horizons with a mollic epipedon and are on similar landscape positions.
Counterfeit soils: have greater than 35 percent clay and are on graded hillsides.
Cropley soils: have cracks at the surface during the summer and are on floodplains.
Gorgonio soils: have a sandy textures with a mollic epipedon and are on young alluvial fans.
Palmview soils: have less than 18 percent clay and are on young alluvial fans.
Pierview soils: have an argillic horizon that extends below a depth of 150 cm and are on fan remnants from sedimentary sources.
Ramona soils: have an argillic horizon and are on fan remnants and terraces.
Sepulveda soils: have calcium carbonates throughout and are formed in human transported materials that originate from alluvium from sedimentary sources.
Tujunga soils: have sandy textures and are on alluvial fans and floodplains.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained; low to high runoff; moderate to moderately low saturated hydraulic conductivity.

USE AND VEGETATION: Montebello soils are used for urban residential development and commercial areas. Vegetation is primarily maintained lawns, ornamental trees and shrubs.

DISTRIBUTION AND EXTENT: Coastal plains and valleys of southern California in urban areas of MLRA 19, Southern California Coastal Plain. These soils are moderately extensive.

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

SERIES ESTABLISHED: Los Angeles County, California, 2016. Proposed 2012

REMARKS: Diagnostic horizons and features recognized in this pedon ae:

Ochric epipedon - the zone from a depth of 0 to 9 cm
Human transported material - the zone from a depth of 0 to 87 cm
Particle-size control section - the zone from a depth of 25 to 87 cm

Presence of natural materials within 2 meters of the surface is not series criteria.

ADDITIONAL DATA: NASIS USER SITE ID: 2011CA696659
Classified using the Twelfth Edition Keys to Soil Taxonomy (2014)

---

National Cooperative Soil Survey
U.S.A.