IDENTIFIERS

Current Taxon Name (Soil Name): Bressa

OSD

Series Extent

User Site ID: S2012CA055002

User Pedon ID: S2012CA055002

Lab Information:

Certified Lab Pedon Description - no

Print Date: 4/22/2026

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: 38.6140830

Std. Longitude: -122.3495830

Datum: WGS84

Location Description: Vineyard site of a pairing of soil climate stations/sites. This site is a vineyard. A soil climate monitoring station has been placed in sampled pedon and the HOBO U30 data logger is mounted on a vine trellis post. The other station is in a rangeland several about 60 or 70 feet uphill. The purpose of the study is to isolate management practices as factors of soil moisture and temperature. The rangeland site has a similar soil, slope, and aspect. These sites are on land owned by a vineyard in the Pope Valley area of Napa County.

State: California

County: CA055—Napa

MLRA: 15—Central California Coast Range

Regional Office: SW—Southwest

MLRA Soil Survey Area: SW-TEM—Templeton, California

PEDON

Describers Name: Phil Smith, Bev Harben

Current Taxonomic Class: Fine-loamy, mixed, active, thermic Typic Haploxeralfs

Current Taxon Kind: family

Pedon Type: not classified to current taxon name

Pedon Purpose: research site

Pedon Record Orgin: NASIS

Sampled As Information:

Soil Name - Bressa

Taxonomic Class - Fine-loamy, mixed, active, thermic Typic Haploxeralfs

Taxon Kind - family

PSC - 41 to 91 cm.

Classificaton Date - 2/13/2013

Classifier - Phil Smith

Soil Taxonomic Edition - eleventh edition

Moisture SUBClass - xeric

Dynamic Soil Properties:

Pedoderm Loose Cover Indicator - no

Hydric: no

SITE

Parent Material: colluvium derived from sandstone and shale

Landscape: hills

Landform: hill

Anthropogenic Feature: hillslope terrace

Geomorphic Component Hills: side slope

Hill Slope Profile: backslope

Slope Position: lower third

Slope Complexity: complex

Slope Shape Across: linear

Slope Shape Down: linear

Drainage Class: well

Flooding: none flooding

Ponding: none ponding

Bedrock: shale, unspecified

Surface Fragments:

Benchmark Soil?: no

VEGETATION

SITE OBSERVATION

Observation Date: 12/12/2012 (monitoring equipment installed)

Data Collector: Phil Smith, Bev Harben

Surface Water Kind: none observed

Microrelief Kind: microslope

Microrelief Elevation: 50

Surface Cover Properties:

Site Obs. Cover Kind 1 - crop cover

Pedoderm Loose Cover Indicator - no

Drained? - no

Bedded Soil? - no

Forest Plantation? - no

Pedon Diagnostic Features
Feature Kind	Feature Depth L-H	Feature Thickness L-RV-H
	cm
ochric epipedon argillic horizon	0—41 41—101	—41— —60—

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
10	—	—	172	—	178	762	—	240	18	—	—	—	—	—	—	—	SSV	BDI - Napa - Vineyard	SM/ST

A—0 to 22 centimeters (0.0 to 8.7 inches); light yellowish brown (10YR 6/4) broken face, brown (10YR 4/3) broken face, moist; silty clay loam; 28 percent clay; moderate medium subangular blocky, and moderate medium granular structure; moderately hard, firm, moderately sticky, moderately plastic; common (1.0) very fine roots between peds and common (1.0) coarse roots throughout; many (10.0) medium tubular and many (5.0) fine dendritic tubular and common (3.0) coarse tubular pores; 2 percent by volume flat subangular very strongly coherent cemented 5-15-20 millimeter mudstone fragments observed by visual inspection method; neutral, pH 6.6, pH indicator solutions; clear wavy boundary.; dry when described; observed in pit, large or quarry

2Ab—22 to 41 centimeters (8.7 to 16.1 inches); light yellowish brown (10YR 6/4) broken face, brown (10YR 4/3) broken face, moist; silt loam; 20 percent clay; moderate medium subangular blocky structure; hard, very firm, moderately sticky, very plastic; common (2.0) very fine roots throughout and common (2.0) medium roots throughout and common (2.0) coarse roots throughout; common (2.0) medium tubular and many (6.0) fine dendritic tubular pores; 2 percent by volume flat angular very strongly coherent cemented 5-15-20 millimeter mudstone fragments observed by visual inspection method; slightly acid, pH 6.1, pH indicator solutions; clear smooth boundary.; dry when described; observed in pit, large or quarry

2Bt1—41 to 70 centimeters (16.1 to 27.6 inches); 50 percent brown (7.5YR 4/3) broken face and 50 percent brown (7.5YR 4/4) broken face, brown (7.5YR 4/3) broken face, moist; silty clay loam; 33 percent clay; weak coarse prismatic parts to moderate coarse subangular blocky structure; hard, firm, moderately sticky, very plastic; common (1.0) medium roots throughout and few (0.1) fine roots throughout and common (1.0) coarse roots throughout; 10 percent distinct clay films on all faces of peds; 2 percent by volume nonflat subangular very strongly coherent cemented 5-15-20 millimeter mudstone fragments observed by visual inspection method; slightly acid, pH 6.1, pH indicator solutions; clear wavy boundary.; dry when described; observed in pit, large or quarry

2Bt2—70 to 101 centimeters (27.6 to 39.8 inches); yellowish brown (10YR 5/4) broken face, dark yellowish brown (10YR 4/4) broken face, moist; paragravelly silty clay loam; 33 percent clay; weak coarse prismatic parts to weak coarse subangular blocky structure; hard, firm, slightly sticky, very plastic; few (0.1) medium roots throughout and few (0.1) fine roots throughout; 10 percent faint clay films on all faces of peds; , 15 percent by weight nonflat subrounded very strongly coherent cemented 5-15-20 millimeter mudstone fragments observed by visual inspection method; neutral, pH 6.8, pH indicator solutions; clear wavy boundary.; dry when described; observed in pit, large or quarry

3C—101 to 200 centimeters (39.8 to 78.7 inches); brown (7.5YR 5/4) broken face, brown (7.5YR 4/4) broken face, moist; extremely parachannery clay loam; 30 percent clay; weak medium subangular blocky structure; few (0.1) medium roots throughout; 10 percent faint clay films on all faces of peds; 25 percent by volume nonflat subrounded very strongly coherent cemented 5-15-20 millimeter mudstone fragments observed by visual inspection method and 50 percent by volume flat angular very strongly coherent cemented 5-15-20 millimeter mudstone fragments observed by visual inspection method.; dry when described; observed in pit, large or quarry