IDENTIFIERS

  • Current Taxon Name (Soil Name): POSITAS
  • OSD
  • Series Extent
  • User Site ID: S1959CA001002
  • User Pedon ID: S1959CA001002
  • Vegetation Plot ID: S1959CA001002
  • Lab Information:
  • Certified Lab Pedon Description - no
  • Lab Source ID - SSL
  • Lab Pedon # - 40A2929
  • NCSS Pedon Lab Data NASIS Record ID - 38058
  • Print Date: 11/21/2024

    • LOCATION

  • Location In Web Soil Survey
  • AOI is roughly a square mile and pedon is marked in the center.
  • Location in SoilWeb
  • Location in Google Maps
  • Std. Latitude: 37.6255569
  • Std. Longitude: -121.7852783
  • Datum: WGS84
  • Location Description: Land grant - 169 degrees east of true north of BM 448, 122 degrees east of true north of BM 478, about 4 miles south of the center of Livermore in the Crowhare Ranch
  • State: California
  • County: CA001—Alameda
  • MLRA: 15—Central California Coast Range
  • Non-MLRA Soil Survey Area: CA609—Alameda Area, California

    • PEDON

  • Describers Name: L. E. Welch
  • Current Taxonomic Class: Fine, smectitic, thermic Mollic Palexeralfs
  • Pedon Purpose: full pedon description
  • Pedon Record Orgin: Converted from PDP 3.x
  • Pedon #: 2
  • Correlated Information:
  • Soil Name - POSITAS
  • PSC - 25 to 100 cm.
  • Classificaton Date - 7/16/2007
  • Moisture Class - xeric
  • Sampled As Information:
  • Soil Name - Positas
  • Classificaton Date - 5/4/1959
  • Dynamic Soil Properties:
  • Pedoderm Loose Cover Indicator - no
  • Hydric: no


    • SITE

  • Landform: terrace
  • Runoff: medium
  • Drainage Class: well
  • Surface Fragments:
  • Benchmark Soil?: no

    • VEGETATION

    SITE OBSERVATION

  • Observation Date: 5/4/1959 (actual site observation date)
  • Surface Cover Properties:
  • Site Obs. Cover Kind 1 - crop cover
  • Pedoderm Loose Cover Indicator - no
  • Drained? - no
  • Bedded Soil? - no
  • Forest Plantation? - no
    • Vegetation Plot Plants
    Plant Symbol Scientific Name National Vernacular Name Plant Type Group Canopy Cover % Vegetation Stata Level

    TRIFO

    Trifolium

    clover

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    Setting and Climate
    Slope Slope Length USLE Upslope Length Elev. Corr. Elev Aspect MAP REAP FFD MAAT MSAT MWAT MAST MSST MWST MFFP PE Index Climate Station ID Climate Station Name Climate Station Type
    % m degrees mm mm C mm

    5

    —

    —

    195

    —

    225

    381

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    AP—0 to 20 centimeters (0.0 to 7.9 inches); brown (10YR 5/3), dark brown (10YR 3/3), moist; loam; massive; very hard, friable; 21.0 fine roots; 21.0 fine tubular pores; fragments; moderately acid, pH 6.0, unspecified; clear smooth boundary. Lab sample # 40A23102
    A12—20 to 28 centimeters (7.9 to 11.0 inches); brown (10YR 5/3), dark brown (10YR 3/3), moist; loam; massive; very hard, friable; 21.0 fine roots; 21.0 fine tubular pores; fragments; moderately acid, pH 6.0, unspecified; abrupt smooth boundary. Lab sample # 40A23103
    B21—28 to 46 centimeters (11.0 to 18.1 inches); reddish brown (5YR 4/3), dark reddish brown (5YR 3/4), moist; clay; strong coarse prismatic structure; extremely hard, extremely firm, moderately sticky, very plastic; 1.0 fine roots; 0.5 pores; clay films on faces of peds; fragments; slightly acid, pH 6.2, unspecified; clear smooth boundary. Lab sample # 40A23104. nonporous except for cracks along ped faces; colloid nearly fills all pores; continuous - phpvsfiid 186660; continuous - phpvsfiid 186660
    B22—46 to 61 centimeters (18.1 to 24.0 inches); brown (7.5YR 4/3), brown (7.5YR 4/4), moist; clay; strong coarse prismatic structure; extremely hard, extremely firm, moderately sticky, very plastic; 1.0 fine roots; 0.5 pores; clay films on faces of peds; fragments; slightly acid, pH 6.5, unspecified; abrupt irregular boundary. Lab sample # 40A23105. continuous - phpvsfiid 186661; continuous - phpvsfiid 186661
    B31—61 to 89 centimeters (24.0 to 35.0 inches); strong brown (7.5YR 5/6), brown (7.5YR 4/4), moist; gravelly clay loam; massive; very hard, firm, moderately sticky, moderately plastic; 1.0 fine roots; 0.5 fine tubular pores; clay films in root channels and/or pores; fragments; moderately alkaline, pH 8.0, unspecified; gradual smooth boundary. Lab sample # 40A23106. continuous - phpvsfiid 186662; continuous - phpvsfiid 186662
    B32—89 to 127 centimeters (35.0 to 50.0 inches); strong brown (7.5YR 5/6), brown (7.5YR 4/4), moist; gravelly clay loam; massive; hard when dry, friable; clay films in root channels and/or pores; fragments; moderately alkaline, pH 8.0, unspecified; gradual smooth boundary. Lab sample # 40A23107. continuous - phpvsfiid 186663; continuous - phpvsfiid 186663
    C1—127 to 127 centimeters (50.0 to 50.0 inches); yellowish brown (10YR 5/6), strong brown (7.5YR 5/6) and brown (7.5YR 4/4), moist; gravelly loam; massive; hard when dry, friable; 0.5 fine roots; 0.5 fine tubular pores; 10 percent clay films; fragments; moderately alkaline, pH 8.0, unspecified. Lab sample # 40A23108