LOCATION KITCHEN CREEK CAEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, mesic Ultic Argixerolls
TYPICAL PEDON: Kitchen Creek loamy coarse sand - chaparral. (Colors are for dry soil unless otherwise noted.)
A11--0 to 4inches; Dark brown (10YR 3/3) loamy coarse sand, very dark brown (10YR 2/2) moist; weak fine granular structure; soft, very friable, nonsticky, nonplastic; many very fine roots; many very fine interstitial pores; slightly acid (pH 6.5); clear smooth boundary. (3 to 8 inches thick)
A12--4 to 12 inches; Dark brown (10YR 3/3) loamy coarse sand, very dark brown (10YR 2/2); weak fine granular structure; soft, friable, nonsticky, nonplastic; common fine roots; slightly acid (pH 6.5); gradual smooth boundary. (5 to 12 inches thick)
A13--12 to 21 inches; Dark brown (10YR 4/3) coarse sandy loam, dark brown (10YR 3/3) moist; massive; slightly hard, friable, nonsticky, nonplastic; few fine roots; slightly acid (pH 6.5); clear smooth boundary. (8 to 14 inches thick)
B1--21 to 28 inches; Light brownish gray (10YR 6/2) coarse sandy loam, brown (10YR 5/3) moist; massive; hard, friable, nonsticky, slightly plastic; few fine roots; common fine pores; colloids in bridges between mineral grains; slightly acid (pH 6.5); clear wavy boundary. (5 to 10 inches thick)
B2t--28 to 42 inches; Pale brown (10YR 6/3) coarse sandy loam, yellowish brown (10YR 5/4) moist; massive; hard, friable, slightly sticky, slightly plastic; few fine roots; common fine pores; colloid bridging mineral grains; moderately acid (pH 6.0); gradual smooth boundary. (10 to 18 inches thick)
B3t--42 to 54; Very pale brown (10YR 7/3) coarse sandy loam, pale brown (10YR 6/3) moist; massive; hard, friable, nonsticky, slightly plastic; few fine roots; few fine tubular pores; colloid bridging mineral grains; moderately acid (pH 6.0); gradual smooth boundary. (9 to 16 inches thick)
C1--54 to 73 inches; White (10YR 8/2) decomposed granitic rock, containing very dark gray (10YR 3/1) mica crystals and very dark grayish brown (10YR 3/2) stains of decaying roots, very pale brown (10YR 7/4) and light yellowish brown (10YR 6/4) moist; massive; hard; few fine roots along fracture planes; moderately acid (pH 6.0).
TYPE LOCATION: San Diego County, California; in Campo Indian Reservation; 800 feet southwest of SE 1/4 corner, sec. 3, T.17S., R.6E; 116 degrees, 21 minutes, 9 seconds west longitude, 32 minutes, 43 minutes, 20 seconds north latitude: UTM 11 560686e 360975n, NAD83.
RANGE IN CHARACTERISTICS: Depth to a paralithic contact of weathered rock is 40 to 60 inches. The mean annual soil temperature at a depth of 20 inches is about 58 degrees F. Soil between depths of 8 and 24 inches usually is moist in some part from about December 1 until June 1 and is continuously dry the rest of the time. Base saturation is 65 to 75 percent in some part of the upper 30 inches of the soil profile. Some of the upper part has 75 to 80 percent base saturation and all of the soil below a depth of 30 inches has about 80 to 90 percent base saturation. The A horizon is brown, dark brown or very dark grayish brown in 10YR hue. Moist value and hue is less than 3.5. Organic matter is 1 to 3 percent to 12 inches depth and averages less than 1 percent at 20 inches depth. This horizon has weak or moderate granular structure in the upper part or in all parts. In some pedons the lower part of this horizon is massive. It is soft or slightly hard when dry and is slightly acid or neutral. This soil has a transitional A3 or B1 horizon or the A1-B2t boundary is gradual. The B2t horizon is brown, light brown, pale brown or very pale brown in 10YR and 7.5YR hue. It is coarse sandy loam or heavy coarse sandy loam with less than 18 percent clay. The absolute clay increase from A horizon to B2t horizon is about 3 to 8 percent. This horizon is medium acid to neutral. A transitional B3 horizon is present or the boundary between the B2t horizon and C horizon is gradual.
COMPETING SERIES: These are the Ahwahnee, Blasingame, Crouch, Fallbrook, and Tretten series. Ahwahnee soils lack sufficient organic matter to qualify for a mollic epipedon and have mean annual temperature of 60 degrees F. Blasingame and Fallbrook soils have hard and massive A horizons and more than 18 percent clay in the argillic horizons. Crouch soils lack argillic horizons. Tretten soils have mean annual temperature greater than 59 degrees F.
GEOGRAPHIC SETTING: Kitchen Creek soils are moderately sloping to strongly sloping at elevations of 2,500 to 4,500 feet and are on sloping to rolling broad ridges that are boundary by short escarpment slopes. They formed in residuum weathered from granitic and other acid igneous rocks. The climate is subhumid mesothermal with hot dry summers and relatively short mild moist winters. Mean annual precipitation is 18 to 22 inches. Average January temperature is about 45 degrees F., average July temperature is about 70 degrees F., and the average annual temperature is about 56 degrees F. The freeze-free season is about 160 to 185 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Calpine, La Posta, and Mottsville soils. Calpine soils lack argillic horizons. La Posta and Mottsville soils lack argillic horizons and are sandy.
DRAINAGE AND PERMEABILITY: Somewhat excessively drained; medium runoff; moderately rapid permeability.
USE AND VEGETATION: Used for watershed, wildlife, and recreation. Vegetation is broadleaf chaparral, chamise, and a small amount of annual grasses.
DISTRIBUTION AND EXTENT: Coast Range in southern California. The soils are inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: San Diego County, California, 1973.
REMARKS: The Kitchen Creek soils were formerly classified as Brunizems.
ADDITIONAL DATA: Riverside Laboratory S61Calif - 37 - 4. Not published to date.
OSED scanned by SSQA. Last revised by state on 8/73.
UTM, Longitude and Latitude added 2/2009 ET.