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INTERPRETIVE GUIDE TO THE SOILS - Fauquier County

INTERPRETIVE GUIDE TO THE SOILS - Fauquier County

Table. Summary of Soil

Table. Summary of Soil Characteristics and Use Potential (**-- not part of official soil survey) MAP. UNIT SYMBOL SOIL NAME SLOPE 70A Mt. Lucas loam 0 - 3% SOIL CHARACTERISTICS Deep, somewhat poorly drained, yellowishbrown loamy over clayey soils on nearly level summits and footslopes; developed in colluvium over residuum from basalt and diabase; may have HYDRIC soil inclusions 70B SEE MAP UNIT 70A 71A** Very deep, well drained, reddish-brown silty soils on nearly level summits; developed in Panorama Variant residuum from red Triassic shale, siltstone and silt loam fine-grained sandstone 0 - 3% 71B Panorama Variant silt loam 3 - 8% 71C** Panorama Variant silt loam 7 - 15% Very deep, well drained, reddish-brown silty soils on gently sloping summits and backslopes; developed in residuum from red Triassic shale, siltstone and fine-grained sandstone Very deep, well drained, dark reddish-brown silty soils on broad gently sloping ridges; developed in residuum from red Triassic shale and sandstone 72C SEE MAP UNIT 76C 73A** Moderately deep, well drained, red silty soils on nearly level summits, developed in Penn loam residuum from Triassic shale, siltstone and fine-grained sandstone 0 - 3% 73B Penn loam 3 - 8% Moderately deep, well drained, red silty soils on gently sloping summits and backslopes, developed in residuum from Triassic shale, siltstone and fine-grained sandstone EROSION HAZARD K Factor (surface/subsoil) HYDROLOGIC GROUP Slight 0.37, 0.28 C Slight 0.37, 0.32 B Moderate 0.37, 0.32 B Moderate 0.37, 0.32 B Slight 0.37, 0.24 B Moderate 0.37, 0.24 B USE POTENTIAL AND PROBLEMS FOR SELECTED USES GENERAL DEVELOPMENT USING CENTRAL WATER AND CENTRAL SEWER POOR high water table; shrink-swell clay may occur in lower subsoil Bearing Capacity: low Shrink-swell Potential: high GOOD low bearing capacity when wet (high silt content) Bearing Capacity: low Shrink-swell Potential: low GOOD low bearing capacity when wet (high silt content) Bearing Capacity: low Shrink-swell Potential: low GOOD low bearing capacity when wet (high silt content) Bearing Capacity: low Shrink-swell Potential: low GOOD Bearing Capacity: low Shrink-swell Potential: low GOOD Bearing Capacity: low Shrink-swell Potential: low DEVELOPMENT USING CONVENTIONAL SEPTIC TANK AND DRAINFIELD NOT SUITED high water table MARGINAL percs slowly MARGINAL percs slowly MARGINAL percs slowly POOR shallow to rock POOR shallow to rock AGRICULTURE PRIME PASTURE PRIME CROPLAND PRIME CROPLAND SECONDARY CROPLAND SECONDARY CROPLAND SECONDARY CROPLAND FORESTRY (HARDWOOD) MODERATE MODERATE MODERATE MODERATE MODERATELY LOW MODERATELY LOW LAND USE CAPABILITY CLASS IVw IIe IIe

Table. Summary of Soil Characteristics and Use Potential (**-- not part of official soil survey) MAP. UNIT SYMBOL SOIL NAME SLOPE 73C Penn loam 8 - 15% 73D** Penn loam 15 – 25% 74A** Ashburn silt loam 0 - 3% 74B Ashburn silt loam 3 - 8% 75A** Casanova loam 0 - 3% 75B Casanova loam 3 - 8% SOIL CHARACTERISTICS Moderately deep, well drained, red silty soils on strongly sloping backslopes, developed in residuum from Triassic shale, siltstone and fine-grained sandstone Moderately deep, well drained, red silty soils on moderately steep backslopes, developed in residuum from Triassic shale, siltstone and fine-grained sandstone Moderately deep, moderately well drained, strong brown silty soils with intermittent high water tables on broad, nearly level upland flats; developed from thin fluvial cappings over Triassic siltstone, fine grained sandstone and shale Moderately deep, moderately well drained, strong brown silty soils with intermittent high water tables on broad summits and gently sloping backslopes; developed from thin fluvial cappings over Triassic siltstone, fine grained sandstone and shale Very deep, well drained, dark-red and reddishyellow clayey soils on nearly level summits; developed in residuum from Triassic conglomerate, siltstone and shale Very deep, well drained, dark-red and reddish yellow clayey soils on gently sloping broad summits; developed in residuum from Triassic conglomerate, shale and siltstone EROSION HAZARD K Factor (surface/subsoil) HYDROLOGIC GROUP High 0.37, 0.24 B Very High 0.37, 0.24 B Slight 0.37, 0.24 C Moderate 0.37, 0.24 C Slight 0.37, 0.28 B Moderate 0.37, 0.28 B USE POTENTIAL AND PROBLEMS FOR SELECTED USES GENERAL DEVELOPMENT USING CENTRAL WATER AND CENTRAL SEWER GOOD Bearing Capacity: low Shrink-swell Potential: low FAIR steep slopes Bearing Capacity: low Shrink-swell Potential: low FAIR intermittent high water table; low bearing capacity when wet due to high silt content and/or shrink-swell clay in lower horizon Bearing Capacity: low Shrink-swell Potential: moderate FAIR intermittent high water table ; low bearing capacity when wet Bearing Capacity: low Shrink-swell Potential: moderate GOOD Bearing Capacity: moderate Shrink-swell Potential: moderate GOOD Bearing Capacity: moderate Shrink-swell Potential: moderate DEVELOPMENT USING CONVENTIONAL SEPTIC TANK AND DRAINFIELD POOR shallow to rock POOR shallow to rock steep slopes POOR shallow to rock water table POOR shallow to rock water table MARGINAL percs slowly MARGINAL percs slowly AGRICULTURE SECONDARY CROPLAND PRIME PASTURE SECONDARY CROPLAND SECONDARY CROPLAND PRIME CROPLAND PRIME CROPLAND FORESTRY (HARDWOOD) MODERATELY LOW MODERATELY LOW MODERATE MODERATE MODERATE MODERATE LAND USE CAPABILITY CLASS IIIe IIe IIe

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