Summary Statement:
This metadata summary applies exclusively to the data as it appears in this Loudoun County intranet/internet mapping application. To see the fully FGDC compliant version of this metadata click here.
Abstract:
Small scale digital data consists of mapping units of the various soil types found in Loudoun County, Virginia. A mapping unit typically consists of one or more major soils with minor soils, and is named for the major soils. The data were collected by digitizing manuscript maps derived from USDA soil maps and supplemented by both fieldwork and geological data.
Purpose:
Digital data are used to identify the mapping unit potential for a variety of uses in large areas, such as agriculture drainfield suitability, construction concerns, or development possibility. The information in this guide is NOT intended for use in determining specific use or suitability of soils for a particular site, due to mapping scale of 1:12000.
Supplemental Information:
Fieldwork for the soil survey was first conducted between 1947 and 1952. Soils were originally shown at the scale of 1:15840 and then redrafted by the County soil scientist to 1:12000; the data were redrafted a final time to fit Loudoun County's base map standard of 1:2400. Although the current data rely heavily on the original soil survey, there have been extensive field checks and alterations to the soil map based on current soil concepts and land use.
Data are stored in the corporate ArcSDE Geodatabase as a polygon feature class. The coordinate system is Virginia State Plane (North), Zone 4501, datum NAD83 HARN.
Maintenance and Update Frequency:
The data are updated as field site inspections or interpretation changes occur.
Completeness Report:
Features may have been eliminated or generalized due to scale and intended use. To assist Loudoun County, Virginia in the maintenance of the data, please provide any information concerning discovered errors, omissions, or other discrepancies found in the data.
Data Owner:
Department of Building and Development
Soil:
Soil mapping unit code -see the Interpretive Guide to the Use of Soils Maps; Loudoun County, VA, which is located after the SLOPE code listSlope:
Steep Slopes are defined as any Slope Code = D or E (greater than 15%)Slope classes in the Blue Ridge (Western Loudoun County) are:
A: 0 - 2% NEARLY LEVEL B: 2 - 7% GENTLY SLOPING C: 7 - 15% SLOPING D: 15 - 25% MODERATELY STEEP E: 25% + STEEP
Slope classes in the Piedmont (Eastern Loudoun County) are:
A: 0 - 3% NEARLY LEVEL B: 3 - 8% GENTLY SLOPING C: 8 - 15% SLOPING D: 15 - 25% MODERATELY STEEP E: 25%+ STEEP
HYDRIC SOILS:
Hydric Soils are those that are wet at or near the ground surface for significant periods of the growing season. Hydric soils are one of the three parameters used to define wetlands. The other two parameters include Hydrology (actual perched or apparent water tables) and vegetation (plants identified to survive only or best in wet areas). This list of Hydric Soils should be used only as a guide since soils maps are not intended for site-specific purposes.
Mapping units that are dominantly Hydric Soils
4A Hatboro loam, 0 to 3 % slopes
6A Bowmansville silt loam, 0 to 3 % slopes
66A Waxpool silt loam, 0 to 3 % slopes
69A Elbert silty clay loam, 0 to 3 % slopes
79A Albano silt loam, 0 to 3 % slopes
99A Kinkora-Delanco complex, 0 to 3 % slopes
Mapping units that contain significant inclusions of Hydric Soils
5A Rowland silt loam, 0 to 3 % slopes
10B Mongle loam, 0 to 7 % slopes
12B Rohrersville cobbly loam, 1 to 7 % slopes
63A Kelly silt loam, 0 to 3 % slopes
78A Dulles silt loam, 0 to 3 % slopes
82B Scattersville silt loam, 1 to 7 % slopes
98B Clapham silt loam, 1 to 8 % slopes
Data Owner:
Department of Building and Development
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INTERPRETIVE GUIDE TO THE
USE OF SOILS MAPS OF
LOUDOUN COUNTY, VIRGINIA
Loudoun County Cooperative Extension Office
1 Harrison St, SE
Leesburg, VA 20175
Alex C. Blackburn, Soil Scientist
Special thanks to the Office of Mapping and Geographic Information for assistance in updating this document and the soil maps
Updated 1998
----------------------------------
Table of Contents...........I
Soil Series Mapping Unit Index...........vii
Introduction...........1
General Soils Map...........3
Geologic Setting...........3
General Soil Map Unit Descriptions...........4
Types of Information Available...........11
Maps...........11
Narratives and Manuscripts...........11
Use of Information in this Guide...........13
Map Symbols...........14
Selected Map Symbols Used in Updated County Maps...........14
Selected Mapping Unit Symbols Used in (1960) Published Report...........15
Mapping Unit Potential...........17
Mapping Unit Potential for Development...........17
Mapping Unit Potential for On-site Sewage Disposal...........24
Mapping Unit Potential for Agriculture...........26
Hydrologic Soil Groups...........29
Glossary of Terms Used in this Guide...........30
Summary of Soil Characteristics and Use Potentials...........37
Table -Summary of Soil Characteristics and Use Potential ...........(APPENDIX)
2A Codorus silt loam, (0-3%) occasional flooding......................38
3A Comus silt loam, (0-3%) occasional flooding..................38
4A Hatboro loam, (0-3%)frequent flooding..............................38
5A Rowland silt loam, (0-3%) occasional flooding......................38
6A Bowmansville silt loam, (0-3%)occasional flooding...........39
7A Huntington silt loam, (0-3%) occasional flooding......................39
8A Lindside silt loam, (0-3%) occasional flooding......................40
10B Mongle loam (0-7%) brief ponding............................................40
12B Rohrersville cobbly loam, (1-7%) brief ponding......................40
13B Morven silt loam, (1-8%).......................................................41
14B Manassas silt loam, (1-8%).......................................................41
17B Middleburg silt loam, (1-7%)............................................41
20B Purcellville and Tankerville soils, (2-7%).................................42
20C Purcellville and Tankerville soils, (7-15%)......................42
20D Purcellville and Tankerville soils, (15-25%)......................42
20E Purcellville and Tankerville soils, (25-45%)......................43
23B Purcellville silt loam, (2-7%).......................................................43
27C Airmont very flaggy loam, (7-15%)............................................43
28B Eubanks loam, (2-7%).......................................................44
28C Eubanks loam, (2-7%).......................................................44
29B Eubanks loam, stony (2-7%)............................................44
29C Eubanks loam, stony (7-15%)............................................44
29D Eubanks loam, stony (15-25%)............................................45
30C Tankerville and Philomont soils, (7-15%).................................45
30D Tankerville and Philomont soils, (15-25%)......................45
31B Philomont and Tankerville soils, (2-7%).................................46
38B Swampoodle silt loam, (1-7%) brief ponding......................46
40C Catoctin channery silt loam, (7-15%).................................47
40D Catoctin channery silt loam, (15-25%).................................47
40E Catoctin channery silt loam, (25-45%).................................47
43B Myersville-Catoctin Complex, (2-7%).................................48
43C Myersville-Catoctin Complex, (7-15%).................................48
45B Fauquier silt loam, (2-7%).......................................................48
45C Fauquier silt loam, (7-15%).......................................................48
50C Stumptown flaggy loam, (7-15%)............................................48
50D Stumptown flaggy loam, (15-25%)............................................49
51E Stumptown-Rock outcrop complex, (25-45%)......................49
52C Cardiff channery silt loam, (7-15%).................................49
52D Cardiff channery silt loam, (15-25%).................................49
52E Cardiff channery silt loam, (25-45%).................................50
55B Glenelg silt loam, (2-7%).......................................................50
55C Glenelg silt loam, (7-15%).......................................................50
55D Glenelg silt loam, (15-25%).......................................................50
59C Airmont loam, very rubbly (7-15%)............................................51
60C Sycoline-Catlett complex, (7-15%)............................................51
60D Catlett gravelly silt loam, (15-25%)............................................51
60E Catlett-Rock outcrop complex, (25-45%).................................52
62B Kelly- Sycoline complex, (3-8%)............................................52
63A Kelly silt loam, (0-3%).......................................................52
64B Legore loam, (3-8%)..................................................................52
64C Legore loam, (8-15%).......................................................53
64D Oakhill gravelly silt loam, very stony (15-25%)......................53
65B Montalto silty clay loam, (3-8%)............................................53
66A Waxpool silt loam, (0-3%) ponding............................................53
67B Haymarket and Jackland soils, (2-8%).................................54
67C Haymarket and Jackland soils, (8-15%).................................54
68B Haymarket and Jackland soils, very stony (2-8%)...........54
68C Haymarket and Jackland soils, very stony (8-15%)...........55
69A Elbert silty clay loam, (0-3%) ponding.................................55
70B Leedsville cobbly silt loam, (3-8%)............................................55
70C Leedsville cobbly silt loam, (8-15%).................................56
71B Panorama silt loam, (3-8%).......................................................56
72C Birdsboro loam, (8-15%).......................................................56
73B Penn silt loam, (3-8%).......................................................56
73C Penn silt loam, (8-15%).......................................................56
74B Ashburn silt loam, (1-8%).......................................................57
76B Sudley-Oatlands complex, (3-8%)............................................57
76C Oatlands gravelly silt loam, (8-15%).................................57
76D Oatlands gravelly silt loam, (15-25%).................................57
77C3 Nestoria gravelly silt loam, severely eroded (8-15%)...........58
77D3 Nestoria gravelly silt loam, severely eroded (15-25%)...........58
77E3 Nestoria gravelly silt loam, severely eroded (25-45%)...........58
78A Dulles silt loam, (0-3%).......................................................59
79A Albano silt loam, (0-3%) brief ponding.................................59
80B Brentsville loam, (3-8%).......................................................59
80C Brentsville loam, (8-15%).......................................................60
81B Brumbaugh cobbly silt loam, (2-7%).................................60
81C Brumbaugh cobbly silt loam, (7-15%).................................60
82B Scattersville silt loam, (1-7%) brief ponding......................61
83B Braddock cobbly loam, (2-7%)............................................61
83C Braddock cobbly loam, (7-15%)............................................62
84B Lucketts silt loam, (2-7%).......................................................62
84C Lucketts silt loam, (7-15%).......................................................62
88C Lew channery silt loam, stony (7-15%).................................62
88D Lew channery silt loam, stony (15-25%).................................63
89D Weverton very flaggy silt loam, (15-25%).................................63
89E Weverton very flaggy silt loam, (25-45%).................................64
90B Springwood silt loam, (3-8%)............................................64
91B Springwood-Rock outcrop complex, (3-8%)......................64
91C Springwood-Rock outcrop complex, (8-15%)......................65
93B Hibler silt loam, (0-5%) rarely flooded.................................65
94B Allegheny silt loam, (0-5%) rarely flooded.................................65
95B Goresville gravelly silt loam , (0-5%).................................66
98B Captina silt loam, (1-8%).......................................................66
99A Kinkora-Delanco complex, (0-3%) rarely flooded......................66
Name of Soil Series Occurs in Mapping Unit Airmont Series 27C,59C Albano Series 79A Allegheny Series 94B Ashburn Series 74B Birdsboro Series 72C Bowmansville Series 6A Braddock Series 83B,C Brentsville Series 80B,C Brumbaugh Series 81B,C Cardiff Series 53C,D,E Catlett Series 60C,D,E Catoctin Series 40C,D,E,43B,C Clapham Series 98B Codorus Series 2A Comus Series 3A Delanco Series 99A Dulles Series 78A Elbert Series 69A Eubanks Series 28B,C,29B,C,D Fauquier Series 45B,C Glenelg Series 55B,C,D Goresville Series 95B Hatboro Series 4A Haymarket Series 67B,C,68B,C Hibler Series 93B Huntington Series 7A Jackland Series 67B,C,68B,C Kelly Series 62B,63A Kinkora Series 99A Leedsville Series 70B,C Legore Series 64B,C Lew Series 88C,D Lindside Series 8A Lucketts Series 84B,C Manassas Series 14B Middleburg Series 17B Mongle Series 10B Montalto Series 65B Morven Series 13B Myersville Series 43B,C Nestoria Series 77C3,77D3,77E3 Oakhill Series 64D Oatlands Series 76B,C,D Panorama Series 71B Penn Series 73B,C Philomont Series 30C,D,31B Purcellville Series 20B,C,D,E,22B,23B Rohrersville Series 12B Rowland Series 5A Scattersville Series 82B Springwood Series 90B,91B,C Stumptown Series 50C,D,51E Sudley Series 76B Swampoodle Series 22B,38B Sycoline Series 60C,62B Tankerville Series 20B,C,D,E,30C,D,31B Waxpool Series 66A Weverton Series 89D,E
Soil scientists from Virginia Tech and the USDA Soil Conservation Service conducted the Soil Survey of Loudoun County (fieldwork) between 1947 and 1952. Soils were originally shown on 1938 aerial photography at a scale of 4"= 1 mile; soils were later redrafted to a scale of 1" = 1666' (1:20000) for publication in the USDA's Soil Survey of Loudoun County, Virginia, Series 1951, Number 8, which was issued in September 1960. This publication is out of print, and the supply of copies for public distribution has been exhausted. A revision of the soil survey for Loudoun County has been completed. The manuscript is currently undergoing technical review and publication of the final document is anticipated during the 1999 calendar year.
As part of the County's Geographic Information System (G.I.S.) mapping project, the soil survey maps were redrafted onto the County's base maps, at a scale of 1" = 200', then digitized. This information is available at the Office of Mapping and Geographic Information or through the County soil scientist in the Cooperative Extension Office . Although these updated soil maps rely heavily on the original soil survey, changes in both locations of mapping unit lines and mapping unit descriptions/interpretations have occurred. The soils map is continuously being updated based on field site inspections and therefore the soils map merely represents a point in time. Many new soil series concepts have been developed and the emphasis has changed from primarily agricultural use to include urban uses.
This report is geared to mapping unit potential for general uses. Mapping unit potential ratings attempt to describe the broad range of conditions found in any given mapping unit for the noted uses. For more site-specific soil interpretations contact the County Soil Scientist in the Cooperative Extension Office.
The general soil association map outlines broad areas that have distinctive patterns in landscape and general geographic appearance. Each of the soil associations has a unique set of features which effect general use and management including shape and length of slope; width of ridgetops and valleys; frequency, size, and direction of streams; type of vegetation, rate of growth; and agriculture. These differences are largely the result of broad differences in kinds of soils and in the geologic materials from which the soils formed. A mapping unit typically consists of one or more major soils with minor soils, and is named for the major soils.
This map shows, in small scale, a summary of the information contained on the individual detailed soil maps for Loudoun County. Because of its small scale and general soil descriptions, it is not suitable for planning small areas or specific sites, but it does present a general picture of soils in the County, and can show large areas generally suited to a particular kind of agriculture or other special land use. For more detailed and specific soils information, please refer to the detailed soils maps and other information available from the County Soil Scientist.
Loudoun County is in the northeastern part of Virginia. It is bordered on the north and east by the Potomac River, and on the west by the Blue Ridge Mountains. The eastern half of the County occurs in the Piedmont geologic province and the western half in the Blue Ridge geologic province; the footslopes of the Catoctin Ridge form the boundary line between the two (see Fronstpiece). Topography varies sharply in Loudoun, with elevations above sea level ranging from 180' to 1900'. Major drainage systems include Broad Run, Goose Creek, Catoctin Creek, Bull Run, and numerous minor tributaries to the Potomac. All of these drainage systems are part of the Potomac River Basin.
The Potomac River separates the County from Washington, Frederick, and Montgomery Counties in Maryland. To the west, Loudoun County is bounded by Clarke County, Virginia, and Jefferson County, West Virginia; to the south and to the east by Fairfax County, Virginia. Loudoun County has an area of 521 square miles, or 333,498 acres.
The Blue Ridge Anticlinorium is the structural control for western Loudoun. The Precambrian and Cambrian age metamorphosed rock materials present include crystalline gneisses, metadiabase, and metabasalt, as well as a host of metasedimentary rocks ranging from quartzite to phyllites. The ridge-formers are the white to yellowish-brown Quartzite and limey green to greenish-black metabasalts. The valley between the three major ridges (Blue Ridge, Short Hill Mountain, and Bull Run Mountain-Catoctin Ridge-Furnace Mountain) is underlain by gneisses and metasediments which have been intruded with this metadiabase and subsequently sheared in the metamorphic processes. This complexity of geologic materials, combined with geologic erosion, has led to the formation of a highly complex array of soils.
The Blue Ridge Anticlinorium is the structural control for western Loudoun. The Precambrian and Cambrian age metamorphosed rock materials present include crystalline gneisses, metadiabase, and metabasalt, as well as a host of metasedimentary rocks ranging from quartzite to phyllites. The ridge-formers are the white to yellowish-brown Quartzite and limey green to greenish-black metabasalts. The valley between the three major ridges (Blue Ridge, Short Hill Mountain, and Bull Run Mountain-Catoctin Ridge-Furnace Mountain) is underlain by gneisses and metasediments which have been intruded with this metadiabase and subsequently sheared in the metamorphic processes. This complexity of geologic materials, combined with geologic erosion, has led to the formation of a highly complex array of soils.
Rock materials on the extreme eastern edge of the County are mica schists of the Piedmont geologic province. These materials comprise a very small area of the County, and the soils formed are similar to those of the Harpers geologic formation in the Blue Ridge.
1. Penn-Nestoria-Manassas Association
This association consists primarily of well to moderately well drained, moderately deep and deep soils over red siltstones and fine-grained sandstone. It occurs on broad, undulating uplands with
steeper, more dissected areas along major drainageways. The association comprises 6% of the County and has elevations ranging from 220' to 360' above sea level. The major mapping units of this
association are Penn(73), Nestoria(77), and Manassas(14) soils. Mapping units of lesser extent include Ashburn(74), Dulles(78), and Albano(79) soils. The major soils have fair potential for most
agricultural uses, including woodland management. These soils have good potential for general development on central sewer and fair to poor potential for on-site sewage disposal systems. Depth to
rock, droughtiness, and seasonal water tables are major problems in this association.
2. Albano-Dulles-Ashburn Association
This association consists primarily of poorly to moderately well drained, moderately deep to deep soils over red siltstones and shales. It occurs on nearly level upland flats and depressions with little
dissection. This association comprises 6% of the County and has elevations ranging from 280' to 300' above sea level. The major mapping units of this association are Albano(79) soils, Dulles(78)
soils and Ashburn(74) soil. Mapping units of lesser extent include Penn(73), Nestoria(77), and Manassas(14) soils. The major soils have fair potential for row crops and woodland management. They
have poor to very poor potential for general development on central sewer or on-site sewage disposal systems. Seasonal water tables and clayey subsoils are the limiting factors in the use of this
association for either agricultural or engineering purposes.
3. Brentsville-Nestoria Association
This association consists primarily of well drained, shallow to moderately deep soils formed in residuum of interbedded Triassic arkosic sandstones, siltstones, and shales. It occurs on undulating to
rolling landscapes with moderate relief, but more dissected areas occur along larger drainageways. This association comprises 1% of the County, and has elevations ranging from 250' to 350' above
sea level. The major mapping units in this association are Brentsville(80), Nestoria(77), and Penn(73) soils. Mapping units of lesser extent include Manassas(14), Ashburn(74) and Albano(79) soils.
The major mapping units of this association have fair potential for agriculture, including woodland management. They have fair to good potential for general development on central sewer, but fair to poor
potential for septic tank drainfields. Depth to rock, droughtiness, and steep slopes are major problems in this association.
4. Sycoline-Kelley-Catlett Association
This association consists primarily of moderately well drained to somewhat poorly drained, moderately deep to deep soils over hornfel and granulites. It occurs on nearly level to gently sloping
landscapes with low relief, with steeper, more dissected areas along large drainageways. This association comprises 5% of the County and has elevations ranging from 250' to 470' above sea level.
The major mapping units of this association are Sycoline-Kelly(62) Complex, Kelly(63) soils, Catlett(60) soils and Sycoline-Catlett Complex. Mapping units of lesser extent include Waxpool(66),
Haymarket-Jackland(67), Dulles(78) and Albano(79) soils. The major soils have fair potential for row crops and most tree species due to seasonal water tables. They have fair to poor potential for
general development on central sewer or on-site sewage disposal systems due to high shrink-swell clays and seasonal wetness.
5. Goresville-Clapham-Birdsboro Association
This association consists primarily of well to somewhat poorly drained, very deep soils developed in old alluvium on nearly level terrace positions along the Potomac River. The association comprises
1% of the County, and occurs on three distinct terrace levels with elevations ranging from 220' to 430' above sea level. The major mapping units of this association are Goresville(95), Clapham(98) and
Birdsboro(72) soils. Mapping units of lesser extent include Penn(73), Kinkora(99) and Manassas(14) soils. The Goresville and Birdsboro soils have fair to good potential for general development, on-site
sewage disposal systems and agricultural use. The Clapham soils have fair to poor potential for most uses due to high seasonal water tables and swelling clays.
6. Haymarket-Elbert-Waxpool Association
This association consists primarily of well to poorly drained, very deep soils formed in material weathered from diabase and basalt. It occurs on nearly level to gently sloping undulating landscapes
with low relief. This association comprises 6% of the County, and has elevations ranging from 290' to 430' above sea level. The major mapping units of this association are Haymarket-Jackland(67)
Complex, Elbert(69) and Waxpool(66) Soils. Mapping units of lesser extent include Legore(64), Legore-Oakhill(64C) Complex and Montalto(65) soils. The major soils have fair to very poor potential for
most agricultural uses, including woodland management, and very poor potential for most urban uses. High shrink-swell clays and seasonal water tables are major problems.
7. Legore-Oakhill-Montalto Association
This association consists primarily of well-drained, deep to moderately deep soils formed in material weathered from diabase and basalt. It occurs on gently sloping to sloping convex landscapes and
landforms with rolling relief. This association comprises 2% of the County, and has elevations ranging from 250' to 450' above sea level. The major mapping units of this association are Legore(64),
Oakhill(64D), Legore-Oakhill(64D) Complex and Montalto(65) soils. Manassas(14), Jackland-Haymarket(67) and Elbert(69) soils are also found within this association, though to a lesser extent. The
major soils have good potential for pasture and hay crops or woodland management. They have fair to good potential for general development on central water and sewer or on-site sewage disposal
systems. High rock fragment content and depth to rock are major limiting factors.
8. Rowland-Bowmansville-Kinkora Association
This association consists primarily of moderately well to poorly drained, very deep soils developed from recent alluvium. Located along larger drainageways, this association comprises 2% of the
County and has elevations ranging from 180' to 300' above sea level. The major mapping units of this association are Rowland(5), Bowmansville(6), Delanco and Kinkora(99) soils. Mapping units of
lesser extent include Albano(79), Comus(2), Huntington(7) and Lindside(8) soils. The major soils have good potential for grassland agriculture, but very poor potential for general development on
central sewer or for on-site sewage disposal systems. Seasonal high water tables, low bearing capacity, and flooding are major problems.
9. Morven-Lucketts-Springwood Association
This association consists primarily of well-drained, very deep soils developed from residuum and mountain colluvium over residuum of calcareous conglomerates. It occurs on convex ridgecrests and
gentle side slopes in undulating landscapes. This association comprises 2% of the County and has elevations ranging from 250' to 450' above sea level. The major mapping units of this association
are Morven(13), Lucketts(84) and Springwood(90) soils. Mapping units of lesser extent include Penn(73), Sudley-Oatlands(76) complex, Braddock(83) and Brumbaugh(81) soils. The major soils have
good potential for most agricultural uses and most species of trees. They have fair to very poor potential for general development on central sewer and are poorly suited for on-site sewage disposal
systems. Sinkholes, rock outcrops, slowly permeable subsoils, and potential groundwater pollution are major problems in this association.
10. Lindside-Huntington-Allegheny Association
This association consists primarily of moderately well to well drained, very deep soils developed from recent alluvium. Located along larger drainageways, this association comprises 1% of the
County, and has elevations ranging from 180' to 250' above sea level. The major mapping units of this association are Lindside(8), Huntington(7), and Allegheny(94) soils. Mapping units of lesser
extent include Comus(2), Hatboro(4), Delanco and Kinkora(99) soils. The major soils have good potential for cropland agriculture, but very poor potential for general development on central sewer or
for on-site sewage disposal systems. Flooding, low bearing strengths and seasonal high water tables are major problems.
11. Mongle-Codorus-Hatboro Association
This association consists primarily of moderately well to poorly drained, very deep soils developed from recent alluvium. Located along larger drainageways, this association comprises 2% of the
County, and has elevations ranging from 180' to 300' above sea level. The major mapping units of this association are Mongle(10), Codorus(3) and Hatboro(4) soils. Mapping units of lesser extent
include Comus(2), Middleburg(17) and Lindside(8) soils. The major soils have good potential for grassland agriculture, but very poor potential for general development on central sewer or for on-site
sewage disposal systems. Seasonal high water tables, low bearing capacity, and flooding are major problems.
12. Springwood-Rock Outcrop Association
This association consists primarily of well-drained, very deep soils developed from residuum of calcareous conglomerates in complex with rock outcrops. It occurs on convex ridgecrests and gentle
side slopes in undulating landscapes. This association comprises 3% of the County and has elevations ranging from 250' to 450' above sea level. The major mapping units of this association are
Springwood (90-91) soils, and Rock Outcrops. Mapping units of lesser extent include Morven(13), Lucketts(84), Braddock(83) and Penn(73). The major soils have good potential for grassland
agricultural uses and most species of trees. They have poor to very poor potential for general development on central sewer and are poorly suited for on-site sewage disposal systems. Sinkholes,
rock outcrops, slowly permeable subsoils, and potential groundwater pollution are major problems in this association.
13. Braddock-Brumbaugh Association
This association consists of well to moderately well drained, very deep, gravelly soils formed in old mountain colluvium. It occurs on rolling convex landforms that are well dissected. This association
comprises 3% of the county and has elevations ranging from 240' to 500' above sea level. The major mapping units in this association are Braddock(83) and Brumbaugh(81) soils. Mapping units of
lesser extent include Rohrersville(12) and Middleburg(17) soils. The major soils of this mapping unit have fair to good potential for agricultural use and woodland management, and good potential for
orchards. They have fair to good potential for general development on central sewer and fair potential for on-site sewage disposal systems. Slow substratum permeability and eroded surface soils are
major problems in this association.
14. Sudley-Leedsville-Oatlands Association
This association consists primarily of well-drained, very deep to moderately deep soils over red sandstones and conglomerates. It occurs on broad and narrow convex ridgetops and upper side slopes
in dissected rolling landscapes. This association comprises 4% of the county and has elevations ranging from 295' to 400' above sea level. The major mapping units of this association are Sudley-
Oatlands(76) Complex, and Leedsville(70) soils. Mapping units of lesser extent include Manassas(14) and Penn(73) soils. The soils in this association have good potential for agricultural and
woodland management. The major soils have good potential for general development on central sewer and fair to good potential for on-site sewage disposal systems. Cobbles in the surface and depth
to rock are the problems in this association.
15. Cardiff-Glenelg Association
This association consists primarily of well drained moderately deep to very deep soils over quartz Muscovite schist and phyllites. It occurs in side slopes and ridgetops in rolling to steep landforms.
This association comprises 2% of the county and has elevations ranging from 400' to 900' above sea level. The major mapping units of this association are Cardiff(52) and Glenelg(55) soils. Mapping
units of lesser extent include Middleburg(17) soils. The major soils have poor to good potential for agriculture and woodland management. They have good potential for general development on central
sewer and for on-site sewage disposal systems. The major problems in this association are steep slopes, depth to rock and very low inherent fertility.
16. Stumptown-Rock Outcrop Association
This association consists primarily of well drained, moderately deep soils formed in residuum and slope creep of interbedded quartz and quartz Muscovite schist. It occurs on ridgetops, side slopes
and benches of the northern Blue Ridge, Short Hill, and Bull Run Mountains. This association comprises 4% of the county and has elevations ranging from 300' to 1300' above sea level. The major
mapping units of this association are Airmont(27, 59), Weverton(89) and Stumptown(50-51) soils. The major soils have poor potential for most agricultural uses and have fair potential for woodland
management. They have fair to very poor potential for general development on central sewer and have poor potential for on-site sewage disposal systems. Major problems in the association are steep
slopes, rough terrain, numerous stones and rock outcrops and depth to rock.
17. Airmont-Scattersville-Rohrersville Association
This association consists of well to moderately well drained to somewhat poorly drained, very deep, gravelly soils formed in old mountain colluvium. It occurs on rolling convex landforms that are
well dissected. This association comprises 2% of the County and has elevations ranging from 240' to 500' above sea level. The major mapping units in this association are Airmont(27,59), Scattersville(82),
and Rohrersville(12) soils. Mapping units of lesser extent include Weverton(89), Stumptown(50-51), Catoctin(40) and Cardiff(52) soils. The major soils of this mapping unit have poor potential for agricultural
use and good potential woodland management, and good potential for orchards. They have poor potential for general development on central sewer and on-site sewage disposal systems. Slow substratum permeability,
high water tables, and surface stones and boulders are major problems in this association.
18. Catoctin-Myersville-Fauquier Association
This association consists primarily of well to moderately well drained, moderately deep to deep soils over metabasalt. It occurs on upland ridges and side slopes with rolling to hilly landforms with high
relief. This association comprises 9% of the county and has elevations ranging from 450' to 850' above sea level. The major mapping units of this association are Myersville-Catoctin(43) Complex, Catoctin(40)
and Fauquier(45) soils. Mapping units of lesser extent include Rohersville(12), Fauquier(45), and Middleburg(17) soils. The major mapping units have fair to good potential for agricultural crops and good
potential for orchards, woodland management, and grassland agriculture. They have fair potential for general development on central sewer, and fair to poor potential for on-site sewage disposal systems. The
major problems in this association are depth to rock, steep slopes, and slowly permeable subsoils.
19. Purcellville-Tankerville-Middleburg Association
This association consists primarily of well to moderately well drained, deep to very deep soils over residuum of granite gneiss that has been intruded with many large to small metadiabase dikes. It occurs
on broad upland ridges in undulating landscapes with low relief. This association comprises 21% of the County and has elevations ranging from 450' to 550' above sea level. The major mapping units of this
association are Purcellville(23), Middleburg(17) and Purcellville-Tankerville(20) Complex. Mapping units of lesser extent include Swampoodle(22, 38), Philomont-Tankerville(30-31)complex, Mongle(10) and
Eubanks(28) soils. The major soils are the best agricultural soils in the county and have good potential for most agricultural uses. These soils have good potential for general development on central sewer
and fair to good potential for on-site sewage disposal systems. Depth to rock and landscape position are the problems in this association.
20. Swampoodle-Purcellville Association
This association consists of moderately well to poorly drained, deep or very deep soils in residuum and fluvium from crystalline rock of the Blue Ridge uplands. It occurs on nearly level to undulating
landforms with low relief. This association comprises 5% of the County and has elevations ranging from 250' to 500' above sea level. The major mapping unit of this association is the Purcellville-Swampoodle(22)
Complex and Swampoodle(38) soils. Mapping units of lesser extent are Middleburg(17) soils and Mongle(10) soils. The major soils of this association have fair potential for agricultural use, including woodland
management. They have good to very poor potential for general development on central sewer and for on-site sewage disposal systems. Major problems in this association are seasonal water tables and high
shrink-swell clay subsoils.
21. Tankerville-Philomont Association
This association consists primarily of well-drained, moderately deep to very deep soils developed from granite gneiss with narrow metadiabase dikes. It occurs on gently sloping and rolling landforms.
This association comprises 3% of the County and has elevations from 450' to 550' above sea level. The major mapping units of this association are Philomont-Tankerville(31) Complex and Middleburg(17)
soils. Mapping units of minor extent include Eubanks(28), and Purcellville-Tankerville(20) complex soils. The major soils have fair to good potential for agriculture and woodland management. They
have good potential for grassland agriculture. They have good potential for general development on central water and sewer and fair to good potential for on-site sewage disposal systems. Rock outcrop
and depth to rock are major problems in this association.
22. Eubanks Association
This association consists of well-drained, deep to very deep soils formed in residuum of undifferentiated metadiabase, granite gneiss, and charnockites of the Blue Ridge uplands. It occurs on
undulating and rolling landscapes with moderate relief. This association comprises 6% of the County and has elevations ranging from 600' to 800', above sea level. The major mapping units of this
association are Eubanks(28-29), Philomont Tankerville(30) and Middleburg(17) soils. Mapping units of lesser extent include Purcellville-Tankerville(20) Complex, Swampoodle(38) and Mongle(10)
soils. The major soils of this association have good potential for agriculture, woodland management, orchards, and most urban uses. Major problems are slow subsoil permeability in some areas
and surface stones in some areas.
23. Water
Any body of water such as streams, rivers, lakes and ponds.
24. Miscellaneous Areas
These include quarries, man made areas, etc.
The following mapped information may be obtained by contacting Loudoun County's Department of Mapping and Geographic Information, Loudoun County Government Center, 1 Harrison Street, SE, 2nd Floor, Leesburg, Virginia or calling (703) 771-5778.
MAPS
1. Soil maps at a scale of 1" - 200' (Detailed Scale) these maps are corrected and redrafted. Soil Survey information available as overlays to the County's planimetric base map.
2. Soil maps at a scale of 1"- 1000' (Block Scale).
3. Type 1 Preliminary Soils Reports which include an on-site investigation, are available upon request from the County Soil Scientist in the Cooperative Extension Office. These reports can help the user to understand the potential of a specific site for any intended use.
NARRATIVES AND MANUSCRIPTS
In addition to mapped information, the following are a few sources of information about the soils and geology of Loudoun County:
1. Soil Survey of Loudoun County, Virginia, Series 1951, No. 8, U.S. Department of Agriculture, September, 1960. Out of print; copies for cross reference are available at the Library, Natural Resource Conservation Service and the Loudoun Cooperative Extension Office.
2. Interpretive Guide to the Use of Soils Maps, Loudoun Cooperative Extension Office, Loudoun County, Virginia, 1997.
3. Facilities Standards Manual (FSM), Loudoun County, Virginia, 1993.
The FSM contains a discussion of soils and geotechnical matters, with types of investigations needed to review and evaluate soil problems.
4. Detailed soil profile descriptions from pits and laboratory analyses conducted on samples are available from the County Soil Scientist. This information is highly technical and is of limited use to the lay person.
5. Geologic Map of Loudoun County Virginia, USGS United States Geological Survey open file report 92-716 by W. C. Burton, A. J. Froelich, J. S. Schindler, and C. S. Southworth, 1992.
6. Geologic Map of Virginia and Expanded Explanation, Virginia Division of Mineral Resources.
7. Interpretive Guide to Geology and Groundwater in Loudoun County Virginia by the Department of Environmental Resources of Loudoun County 1993. No longer available.
HOW TO USE THIS INFORMATION
This material is intended for planning purposes, as well as to alert the reader to the broad range of conditions, problems, and use potential for each mapping unit. A mapping unit (for example, "73B") is the County wide sum of all mapping delineations (all the "73B" areas in the County). For most mapping units in Loudoun County, the individual series in a mapping unit name (for example, "Penn" soils in the 73B mapping unit or "Purcellville" soils in the 23B mapping unit) may account for only 50% of the soils actually to be found in the mapping unit. The mapping unit potential use rating refers to the overall combination of soil properties and landscape conditions. Therefore, a mapping unit rated as having good potential for urban uses probably contains some areas that have much poorer potential. Conversely, a mapping unit rated as having poor potential for a designated use may contain areas with good potential for that use. In on-site investigations, work is completed with much greater detail and inclusions of good or problem soils are specifically identified.
The information in this guide will enable the user to determine the distribution and extent of various classes of soil and generally, the types of problems which may be anticipated. For example, for a proposed subdivision using individual wells and septic tank drainfield systems, a site with mostly Class IV soils is probably not a viable project; whereas one with mostly Class I soils probably is, and would warrant a detailed on-site investigation. For a proposed rezoning or subdivision utilizing central water and sewer facilities, a site with mostly Class IV soils should have a Type 1, preliminary soils review conducted to determine the extent of problem areas, followed by a detailed geotechnical investigation at the subdivision stage to assist in design review and construction.
HOW NOT TO USE THIS INFORMATION
The information in this guide is not intended for use in determining specific use or suitability of soils for a particular site. It is of utmost importance that the reader understand that the information is geared to mapping unit potential and not to specific site suitability. An intensive on-site evaluation should be made to verify the soils map and determine the soil/site suitability for the specific use of a parcel.
Soil properties and landscape features unique to a particular mapping unit can be used to describe that mapping units potential for certain generalized uses. The mapping unit potential ratings which are used are intended to indicate general information on soil and site properties for a single mapping unit or group of mapping units.
Mapping unit potential ratings and class criteria have been developed for the following three generalized uses:
These three mapping unit potential ratings allow the comparison of the relative compatibility among a group of soil and site properties and a group of similar uses.
This document contains discussion of use potentials for the three groups named above, including descriptions of potential classes, class criteria, and problems associated with each class. Additionally the criteria for hydrologic group are defined for use in storm water runoff calculations and map units that are dominantly hydric soils are identified.
This information is provided for use in conceptual planning and review, and as an organizational guide for site-specific investigations. The chief objective of mapping unit potential ratings for soils is to maximize the effective use of soil maps. The chief objective of interpretive materials is to spotlight potential soil problems for a variety of uses which may be proposed.
In this section, the soil mapping unit use potentials for general development (on central water and sewer) are discussed. These potentials apply generally to the group of soils occurring within any given mapping unit. Major engineering operations in and on soils in land-development operations were taken into consideration (these include, but are not limited to, roads, foundations, basements, building slabs, shallow excavations, use of soil as controlled fill material, and erosion/sediment control).
1. Soil/Site Criteria Used in Rating Mapping Unit Potential
A. Compaction rates at various moisture contents are determined generally by the amounts of sand, silt, and clay present, and how well this material is graded (particle size distribution).
B. Stability at various moisture contents is also determined by particle size distribution, kind of clay, amount of mica, kind of mica, etc. Such factors also determine the ability of the soil
material to resist sloughing at various slope gradients in the fill.
C. Plasticity and potential volume change (shrink-swell) of materials
D. Bearing capacity of compacted and in-situ material
E. Texture, particularly silt content
F. If used for dam construction, resistance to piping by compacted material; sealing qualities of parent material if in place
G. Nature of the various layers in the soil profile, whether or not they contain fragipans or clay pans, etc.
H. Kind of clay in subsoil and parent material; ability of these layers to withstand erosion
I. Landscape position, whether area receives seepage or is subject to ponding
J. Presence of seasonal water table or restricted drainage
K. Presence and characteristics of bedrock or stones in soil
L. Presence of recent alluvium
M. Presence in the limestone outcrop belt
N. Presence of soil materials subject to slippage (mountain colluvium)
O. Natural slope
P. Soil variability
2. Classes
Mapping units in the Soil Survey of Loudoun County were grouped into one of four classes which reflected their use potential (good, fair, poor, and very poor). These four classes are defined elsewhere in this guide, but may be briefly described as follows:
A. CLASS I - Good potential; few major problems
B. CLASS II - Fair potential; problems can generally be corrected satisfactorily at low cost
C. CLASS III - Poor potential; major problems, many difficult to correct, and results may not always be satisfactory, regardless of other input
D. CLASS IV - Very poor potential; severe problems, some not correctable, and others requiring extensive and costly engineering solutions which may be unsatisfactory
3. Factors
With the exception of Class I (good potential), all other classes have been subdivided into subclasses, with factor subscripts labeling the dominant problem area (not the sole problem area). These soil/site considerations were placed into six major factors, which are:
1. Slope……..S
2. Boulder Content and/or Depth to Rock……..R
3. Wetness……..W
4. Flood Plain……..F
5. Plastic (shrink-swell clays) ……..P
6. Geomorphic stability (limestone/karst or debris flow area) ……..G
KEY TO CLASSIFICATION OF
LOUDOUN COUNTY MAPPING UNITS
FOR SOIL POTENTIAL
ON CENTRAL WATER AND SEWER
| SUBLCASS | IV VERY POOR | III POOR | II FAIR | I GOOD |
|---|---|---|---|---|
| SHRINK- SWELL POTENTIAL (P) |
high to very high PVC |
|
|
low PVC |
| DEPTH TO SEASONAL WATER TABLE WETNESS (W) |
< 18" to prolonged perched water table |
water 30- 60" (short duration, <3 weeks) |
< 60" | |
| DEPTH TO NON- RIPPABLE ROCK (R) |
|
12-30" to non- rippable rock |
> 60" | |
| SLOPE (S) |
> 25% slopes |
15-25% slopes |
8-15% slopes |
< 8% slopes |
| GEOMORPHIC STABILITY (G) |
| |||
| FLOOD PLAIN (F) |
| |||
5. Subclasses Defined
SUBCLASS/CLASS I - GOOD POTENTIAL
A. General Description of the Subclass
These soils are found on convex ridgetops and side slopes in undulating and rolling landscapes with slopes ranging from 2-15%. They occur over red shales, sandstones, and conglomerates in eastern
Loudoun, and over greenstone, biotite schist, quartz-biotite, and granitic rocks in western Loudoun. Class/Subclass I soils have good surface drainage and are moderately well to well drained internally
for urban use. Shrink-swell potential is low to moderate; frost heave potential is moderate to low; depth to hard rock averages greater than five feet. These mapping units account for 33.5% of Loudoun
County's land area.
B. Problems Associated with the Subclass
Mapping units in this class have soil and site properties generally considered good for general development on central water and sewer. Engineering problems common to many Class I soils are high silt
content and dense-in-place but rippable weathered rock materials. While some soils are moderately slow to slowly permeable, perched water which may occur in the soil is of short duration (less than
three weeks).
C. Potential Remedial Actions
Soil-site characteristics (landscape, slope, drainage, plasticity, depth) are favorable, allowing highly effective low-cost engineering solutions to soil and water problems. The rock outcrops occurring
in some mapping units are generally few in number and often readily moved by conventional earthmoving equipment. Frost heave problems can usually be averted by using conventionally required footing depths.
D. Criteria of the Subclass
Mapping units which predominantly meet most or all of the following criteria:
(1) low to moderate PVC (shrink-swell)
(2) more than 60" depth to seasonal water table
(3) more than 60" depth to non-rippable rock
(4) less than 15% slope
Sublcasses Defined (continued)
SUBCLASS II WP - FAIR POTENTIAL, WETNESS AND SOIL STABILITY
A. General Description of the Subclass
These mapping units occur on nearly-level ridgetops and sloping colluvial positions. Surface drainage is fair to good and permeability is moderate to slow. The majority of Subclass II WP mapping
units have high silt content soils, although these do not have high shrink-swell potential. Depth to hard rock is generally greater than five feet. Subclass II WP mapping units occur throughout the
County and account for 8.5% of Loudoun County's land area.
B. Problems Associated with the Subclass
Mapping units in this subclass have a combination of wetness and soil stability problems which somewhat restrict their development potential. Overall, shrink-swell (or plasticity) of these soils is
low to moderate, and is generally not a problem. Frost heave potential is moderate to high. The major problem with respect to utilization of the soils in these mapping units is high silt content, which
gives rise to low bearing capacity when wet and high frost heave potential.
C. Potential Remedial Actions
Soil problems associated with this subclass can be adequately corrected by appropriate engineering analysis and design. These mapping units can generally be effectively utilized by providing surface
grading and foundation drainage. In the case of colluvial soils included in this subclass, controlled fill is suggested to elevate structures out of low-lying waterflow zones. Most soils within
mapping units in Subclass II WP have adequate bearing capacity, either on rock or low silt content subsoils, at depths ranging from 20-40".
D. Criteria of the Subclass
Mapping units which predominantly meet most or all of the following criteria:
(1) low to moderate shrink-swell (PVC)
(2) low activity silt fractions
(3) short-duration (under three weeks) perched water tables at 30-60"
Subclasses Defined (continued)
SUBCLASS IV R - VERY POOR POTENTIAL ROCK CONTENT & DEPTH TO ROCK
A. General Description of the Subclass
Mapping units in Subclass IV R are generally described as miscellaneous land types which have stones and outcrops that occupy 15-50% or more of the soil surface. Many areas have only float rock
on the land surface, but some mapping units have bedrock at or above the land surface. Subclass IV R units occur primarily in the Catoctin, Short Hill, and Blue Ridge Mountains, and over diabase
or limestone conglomerate rock material in eastern Loudoun. They account for 9.5% of Loudoun County's land area.
B. Problems Associated with the Subclass
Subclass IV R mapping units provide numerous development problems for almost any kind of construction. Considerable blasting may be required for both foundations and roads, and in many areas,
particularly in eastern Loudoun, the soil between rock outcrops has a high shrink-swell type clay subsoil similar to that described in Subclass IV P. Removal of float rock more than 10" in diameter
from soil material is difficult and costly, particularly in more plastic soils. Stones and boulders make compaction and fine grading difficult unless removed from fill materials under roads and houses.
If left in backfill material, they can crush sewer and water pipes and break basement and foundation walls
C. Potential Remedial Actions
Float rock, stone, and boulders should be removed from controlled fill materials. Stepped footings or steel-reinforced footings may be a partial solution to differential bearing capacity. Areas of
extensive bedrock outcrop or very large boulders should be left in a natural state. Where soils between stones and rock outcrop have wetness problems or high shrink-swell clays, see the remedial
action section under Subclasses IV W and IV P. Soil materials containing large stones should not be used as backfill over pipes or against foundation walls. Where development is proposed on these
mapping units, a geotechnical study should be used to address the potential problems and make design recommendations.
D. Criteria of the Subclass
(1) more than 15% of land surface is rock outcrop or large boulders
(2) the probability of special-method rock removal from a site should any construction take place is very high
In this section, soil mapping unit use potential for individual septic tank and drainfield sewage disposal sites is provided. The potentials apply generally to the group of soils occurring within any given mapping unit. Major soil/site factors affecting use for drainfields were considered. These ratings may apply to selected alternative on-site, in-soil sewage disposal (such as low pressure or spray irrigation systems). However, since these systems are design and site specific, general ratings often do not apply.
1. Factors Considered
A. depth to water table or natural drainage
B. whether area receives seepage and runoff water (colluvial areas)
C. whether area is subject to flooding (alluvial areas)
D. texture and structure
E. amount and kind of clay
F. thickness of the surface soil and thickness of subsoil or depth to friable, weathered parent material
G. nature of parent material
H. general depth to hard rock or restricting layer
I. past percolation tests of the soil and performance of septic tank drainage fields on this soil
J. steepness of slope (installation problem)
2. Classes Defined
A. CLASS I - Good Potential
These mapping units have a combination of soil and landscape properties that are most suitable for the broadly-defined use. The potential for finding suitable sites within these mapping units is good.
B. CLASS II - Fair Potential
These mapping units have some favorable and some unfavorable soil and landscape properties, or questionable soil properties. Variability of conditions affecting use as drainfield sites is high and
predictability is low. Often these mapping units have soils which require percolation tests as one consideration to permit action.
C. CLASS III - Poor Potential
Those mapping units have questionable and unfavorable soil and landscape features and/or unfavorable soil properties. Predictability within mapping units is fairly accurate, although a site may be
found on mapping unit inclusions (soils outside of the norm described for the unit). The majority of these mapping units are moderately deep soils over siltstones or crystalline rock, or are moderately
well to somewhat poorly drained soils on nearly-level ridgetops and mountain colluvial positions.
D. CLASS IV - Very Poor Potential
These mapping units have highly accurate predictability relative to landscape and drainage features and properties. They have soil and/or landscape features that are generally considered unsuited for
satisfactory drainfield use. These mapping units include somewhat poorly to poorly drained colluvial soils (in swales and depressions), flood plains, soils with high shrink-swell (expanding clay)
subsoils, soils with prolonged high seasonal water tables and soils on greater than 25% slopes or very shallow to rock.
In this section, soil mapping unit potential for agricultural use is provided. Potential ratings are made primarily by soil characteristics; some ratings are influenced by observations of different crops on various soils and by actual yield data. The ratings applied indicate the most conservative use, although certainly not the sole use. Local conditions may strongly impact the use potential of an individual mapping delineation.
1. Factors Considered
A. surface and subsoil texture, and general depth of each
B. natural drainage
C. response of soil to liming, fertilization, and other management factors
D. physical condition as influenced by texture, structure, kind of clay, etc.
E. kind of parent material as it affects the chemical and physical nature of the soil
F. depth to restricting layers (clay pan, fragipan, hard rock, Cr horizon, etc.)
G. water-holding capacity--plus ability of the soil to release this water
H. base exchange capacity--ability of the soil to hold and yet release nutrients to plants
I. characteristics of plant or tree root zone; shallow or deep-rooted crops; also type of root--tap or fibrous; tolerance to wet or droughty soils; food habits (e.g., alfalfa is a heavy user of calcium or lime)
J. presence of large quantities of toxic elements (e.g., aluminum or manganese)
K. air drainage
L. slope aspect
M. elevation
2. Classes Defined
A. Class I - Prime Farmland
These mapping units have a combination of soil and landscape properties that make them highly suited for use as cropland. They have characteristics which require only basic conservation
practices and short rotations. The soils in these mapping units generally have high inherent fertility, good water-holding capacity, deep or thick effective rooting zones, and are not subject
to periodic flooding. The estimated potential corn yield average is greater than 125 bushels per acre; although insufficient data are available at this time to project soybean yields, it is
estimated that these should fall in excess of 45 bushels per acre. This class also has good potential for use in grassland agriculture and forestry, and as wildlife habitat.
B. Class II - Secondary Cropland
Mapping units in this class have soil properties or a combination of soil and site properties that limit their yield potential to marginal levels when used as cropland. Soils in these map units
are best used in medium to long rotations including grassland agriculture. Some map units may require intensive conservation practices (such as tile drainage, diversions, surface water management,
or strip cropping). Major features and properties include seasonal perched water tables; restrictive layers limiting rooting zones; stones and/or cobbles which limit water-holding capacity and affect
tillage, seed bed preparation, and harvesting; and abrupt textural change or bulk density change between the surface and the subsoil, which affects root penetration. The estimated long-term corn yield
potential of these map units is 80-125 bushels per acre. Soybean yields are estimated between 20-40 bushels per acre. This class also has good potential for use in grassland agriculture and forestry,
and as wildlife habitat.
C. Class III - Unique Orchard Land
Map units in this class have a combination of soil properties and landscape features that make them uniquely suited for use as orchard lands or in various fruit production. These features include
aspect, air drainage or relief, natural fertility, and elevation to some degree. Many of the mapping units in this class also fit the criteria for Class II, and a few fit the Class I criteria. This
class also has good potential for use in grassland agriculture and forestry, and as wildlife habitat.
D. Class IV - Grassland Agriculture
This class includes map units which are best suited to use as hay and pasture in grassland agriculture. Included in this class are map units with shallow soils on marginally steep slopes and soils
with drainage conditions not conducive to cropping. This class also has good potential for use in forestry or as wildlife habitat.
E. Class V - Woodland Use and Wildlife Habitat
This class includes map units on very steep slopes, map units with very shallow soils on marginally steep slopes, and map units with substantial rock outcrop. The lands in these map units are best
left undisturbed in their natural wooded environment for use in timber production and wildlife habitat due to difficulty of maintenance of grasslands (as in rock outcrop land or due to erosion and
stability problems on steeper slopes with shallow soils). Many of these map units, particularly those on very steep slopes, are considered to be critical environmental areas and stream buffers. Other
areas include mountainside slopes, particularly where slopes are very steep. Although some map delineations within this class have been cleared and planted to pasture grasses, their best use is in
woodland and as wildlife habitat.
This section provides a description of hydrologic soil group classes used in determining soil-cover complexes in Chapter 2 of Technical Release 55, "Urban Hydrology for Small Watersheds", prepared by the USDA Soil Conservation Service.
The hydrologic parameter (A, B, C, or D) is an indicator of the minimum rate of infiltration obtained for a bare soil after prolonged wetting. By using the hydrologic classification and the associated land use, runoff curve numbers can be selected. Runoff curve numbers are used for determining peak quantity and total volume of surface water runoff for given conditions.
Classes Defined
1. A - Low Runoff Potential
Soils having a high infiltration rate, even when thoroughly wetted, and consisting chiefly of deep, well to excessively drained sands or gravels.
2. B - Soils with Moderate Infiltration Rate
Soils having a moderate infiltration rate when thoroughly wetted, and consisting chiefly of moderately well to well drained soils with moderately fine to moderately coarse texture.
3. C - Soils with Slow Infiltration Rate
Soils having a slow infiltration rate when thoroughly wetted, and consisting chiefly of soils with a layer that impedes downward movement of water, or soils with moderately fine to fine texture.
4. D - High Runoff Potential
Soils having a very slow infiltration rate when thoroughly wetted, and consisting chiefly of clay soils with a high swelling potential, soils with a permanent high water table, soils with a clay pan or clay layer
at or near the surface, and shallow soils over nearly-impervious material.
ALLUVIAL SOIL A soil developing from recently deposited alluvium and which exhibits essentially no horizon development or modification of the recently deposited material.
ALLUVIUM Sand, clay, etc., deposited by flowing water, especially along a river bed (see OVERLAYS).
BOULDERS (See COARSE FRAGMENTS)
CAPPINGS (See OVERLAYS)
CHANNERS (See COARSE FRAGMENTS)
CLAY 1) the smallest soil separate consisting of particles less than 0.002 mm in equivalent diameter, very sticky when wet, and 2) See TEXTURE (SOIL).
CLAY PAN A dense, compacted layer in the subsoil having a much higher clay content than the overlying material, from which it is separated by a sharply defined boundary;
formed by downward movement of clay or by synthesis of clay in place during soil formation. Clay pans are usually hard when dry, and very plastic and sticky when
wet. Clays usually have high shrink-swell potential. Clay pans usually impede the downward movement of water and air, and the growth of plant roots.
COARSE FRAGMENTS Rock or mineral particles greater than 2.0 mm (.079") in diameter, such as stones, gravels, or cobble.
Rounded or Angular Fragments
Gravel 2mm - 3" diameter
(collection of pebbles)
Cobbles 3 - 10" diameter
Stones 10" - 2' diameter
Boulders 2 - 10' diameter
COARSE FRAGMENTS Flat on one side or one dimension much less than the other
Channers .04"(2mm) - 6" long
Flagstone 6 - 15" long
Stones 15" - 2' long
Boulders more than 2'
COLLUVIAL SOILS Soils formed, wholly or in part, from colluvium, and generally found in swales and heads of drainageways or at the base of a steep slope. Most colluvial soils have a lateral
seepage characteristic due to landscape position.
COLLUVIUM A deposit of rock fragments and soil material accumulated at the base of steep slopes as a result of gravitational action (See OVERLAYS).
CR HORIZON Mineral horizons or layers of weathered bedrock and saprolite such as granite, or partly consolidated soft bedrock such as sandstone/siltstone/shale, with bulk density or
consolidation such that roots cannot easily enter. The material can be dug with difficulty with a spade and chunks of gravel size will disperse more or less completely,
in overnight shaking with water or sodium hexametaphosphate solution. This horizon layer is equivalent to the material underlying the paralithic content of Soil Taxonomy
(See PARALITHIC CONTACT).
DEPTH (SOIL) Refers to depth below surface to a restrictive layer. This restrictive layer may be a Cr horizon, fragipan, rock, or other material which impedes the downward movement of
water and may be non-penetrable by roots. Roots further than 4" apart, center to center, are not considered substantial penetration.
VERY SHALLOW 0 - 10"
SHALLOW 10 - 20"
MODERATELY DEEP 20 - 40"
DEEP 40 - 60"
VERY DEEP >60"
DRAINAGE (SOIL) Generally, an interpreted characteristic of a soil which is a function of slope runoff and permeability. Soil drainage classes relate to the net effect of natural moisture
regimes on the soil (See WATER TABLE). Classes used:
WELL DRAINED No indication of a seasonal water table or restricted drainage to 60"+ or into Cr horizon 8"
MODERATELY WELL TO WELL DRAINED Depth to a seasonal water table or restricted drainage is 40-60" below surface
MODERATELY WELL DRAINED Depth to a seasonal water table or restricted drainage is 18-40" below surface
SOMEWHAT POORLY DRAINED Depth to a water table(restricted drainage) is 8-18" below surface
POORLY DRAINED Depth to a water table (restricted drainage) is 0-8" below surface
EROSION (SOIL) The wearing away of the land surface by running water, wind, ice, or other geologic agents, including gravitational creep processes; classes recognized are:
NORMAL Less than 25% of the surface soil has been removed by plowing in the surface. Includes some depositional soils (colluvial and alluvial soils); has no numeric notation in legend
ERODED 25-75% of the surface soil removed and plow layer consists of a mixture of surface and subsoil. May contain gullies which are shown by a symbol designation.(see MAP SYMBOLS)
SEVERELY ERODED More than 75% of the surface soil has been removed. The plow layer consists of mostly subsoil. Usually many gullies occur. Shown by a 3 (e.g.77C3 Nestoria Channery silt loam, severely eroded)
FLUVIUM Alluvium deposited in a fan or delta due to decrease in hydraulic gradient or ponding effects, often locally reworked (See OVERLAY).
FRAGIPAN A natural subsurface horizon with high bulk density relative to the solum above, seemingly cemented when dry, but when moist showing a moderate to weak brittleness.
GRAVEL (See COARSE FRAGMENTS)
LITHIC CONTACT The zone in weathered rock below which rock materials have a hardness greater than 3 on Mohs Scale and are considered unweathered bedrock.
LITHOLOGIC DISCONTINUITY A change in rock material in soils; in a soil profile, generally indicates that the upper portion of the profile has not developed in place.
LIMESTONE OUTCROP BELT Those areas underlain by carbonate bedrock, including, but not limited to, Triassic-Jurassic conglomerate and Cambrian limestone dolomites, and which have landscape with
carbonate bedrock outcrop, sinks, and sinkholes; solution channels in bedrock; and which often exhibit aspects of Karst or Karren topography.
MAP DELINEATION A single area on a soils map depicted by the soil boundary line.
MAP UNIT The collective of all soil map delineations of the same type (number) for a survey area (County). Map units may contain one or more soils which may vary considerably in their
characteristics and use potential.
OVERLAY (CAPPING) General term referring to soils formed in or from materials deposited during past geologic activity; may be alluvial, colluvial, or fluvial in nature.
PARALITHIC Boundary of the soil-rock weathering zone below which contact with the mineral material is generally consolidated, but has a hardness of less than 3
(Mohs Scale) and gravel-size chunks that can be broken out will partially disperse within 15 hours shaking in water or sodium hexametaphosphate solution;
often referred to as weathered bedrock.
RELIEF The difference in elevation between the high and low points in a land surface (landform).
RESIDUUM Unconsolidated and partially weathered mineral materials accumulated by disintegration of consolidated rock in place.
PERMEABILITY (SOIL) Permeability is the rate of flow of water through a unit cross-section of saturated soil in a unit of time, under specified temperature and hydraulic conditions. In rating soils
as to their suitability for on-site sewage disposal systems, permeability tests (PERC TEST) are one of the basic criteria considered. Permeability classes are determined by data
from Uhland core hydraulic conductivity. Soil scientist used the following sets of classes of soil permeability:
Rates per Hour
SLOW Inches Centimeters
1. VERY SLOW <0.06 <.15
2. SLOW 0.06-0.2 .15-.50
MODERATE
3. MODERATELY SLOW 0.2-0.6 .50-1.50
4. MODERATE 0.6-2.0 1.50-5
5. MODERATELY RAPID 2-6 5-15
RAPID
6. RAPID 5-20 15-50
7. VERY RAPID >20 >50
*(These rates through saturated, undisturbed cores in a laboratory and are not the same as percolation tests done for the Health Deptment and recorded as minutes per inch)
SAND 1) a soil separate consisting of particles 2mm-.05mm in equivalent diameter, individual grains can be seen and felt readily. 2) See TEXTURE (SOIL)
SILT 1) a soil separate consisting of particles .05mm-.002 in equivalent diameter, having the feel of talcum powder when dry; 2) See TEXTURE (SOIL)
Slope classes in the Blue Ridge (Western Loudoun County) are:
A 0 - 2% NEARLY LEVEL
B 2 - 7% GENTLY SLOPING
C 7 - 15% SLOPING
D 15 - 25% MODERATELY STEEP
E. 25% + STEEP
Slope classes in the Piedmont (Eastern Loudoun County) are:
A 0 - 3% NEARLY LEVEL
B 3 - 8% GENTLY SLOPING
C 8 - 15% SLOPING
D 15 - 25% MODERATELY STEEP
E 25%+ STEEP
SURFACE Topsoil, layer that is darkened by organic matter (generally less than 10" thick in Loudoun County).
SUBSOIL Subsurface layer in which maximum clay occurs; in most Loudoun County soils less than 40" thick.
SUBSTRATUM The zone of weathered rock material (saprolite) or other weathered parent material below the surface and subsoil above hard rock.
TEXTURE (SOIL) The relative percentage of the various soil separates (sand, silt, and clay) of soil materials less than 2mm in equivalent diameter, modified by
coarse fragments, where present. The following is a partial list of USDA soil textural classes with the class limits:
LOAM Soil material that contains either clay or less and the percentage of silt plus twice the percentage of clay exceeds 30, and 52% or more sand or <7% clay, <50% silt & between 43- 52% sand
LOAM Soil material that contains 7-27% clay, 28-50% silt and <52% sand
SILT LOAM Soil material that contains 50% or more silt and 12-27% clay or 50-80% silt & <12% clay
SANDY CLAY Soil material that contains 20-50%
LOAM clay, <28% silt, and 45% or more sand
CLAY LOAM Soil material that contains 40% clay and 20-45% sand
SILTY CLAY Soil material that contains 40% or more clay and 40% or more slit
CLAY Soil material that contains 40% or more clay, <45% sand and <40% silt
The following section/chart contains soil mapping unit characteristics and use potentials for the following three categories:
1. DEVELOPMENT ON CENTRAL WATER/SEWER
2. CONVENTIONAL SEPTIC TANK DRAINFIELDS
3. AGRICULTURAL USE
|
Mapping |
Soil |
Mapping Unit Potential Subclasses For Selected Uses
|
|||||
|---|---|---|---|---|---|---|---|
2A Codorus
silt loam,
(0-3%)
occasional
flooding,
(C) |
Very deep, |
IV F - very poor potential; subject to flooding |
IV - very poor: flooding potential |
II - secondary cropland |
|||
| depth to hard bedrock is generally greater than 6' |
3W | ||||||
3A Comus
silt loam,
(0-3%)
occasional
flooding,
(B) |
Very deep, well |
IV F - very poor potential; subject to flooding |
IV - very poor: flooding potential |
I - prime farmland |
|||
| depth to hard bedrock is generally greater than 6' |
2W | ||||||
4A Hatboro
loam,
(0-3%)
frequent
flooding,
Hydric soil
(D) |
Very deep, poorly |
IV F - very poor potential; subject to flooding |
IV - very poor: flooding potential |
IV - grassland agriculture |
|||
| depth to hard bedrock is generally greater than 6' |
4W | ||||||
5A Rowland
silt loam,
(0-3%)
occasional
flooding,
(C) |
Very deep, |
IV F - very poor potential; subject to flooding |
IV - very poor: flooding potential |
IV - grassland agriculture |
|||
| depth to hard bedrock is generally greater than 6' |
2W | ||||||
6A
Bowmansville
silt loam,
(0-3%)
occasional
flooding,
Hydric soil
(C) |
Very deep, poorly |
IV F - very poor potential; subject to flooding |
IV - very poor: flooding potential |
IV - grassland agriculture |
|||
| depth to hard bedrock is generally greater than 6' |
4W | ||||||
7A Huntington
silt loam,
(0-3%)
occasional
flooding,
(A) |
Very deep, well |
IV F - very poor potential; subject to flooding |
IV - very poor: flooding potential |
II - secondary cropland |
|||
| depth to hard bedrock is generally greater than 6' |
2W | ||||||
8A Lindside
silt loam,
(0-3%)
occasional
flooding,
(C) |
Very deep |
IV F - very poor potential; subject to flooding |
IV - very poor: flooding potential |
II - secondary cropland |
|||
| depth to hard bedrock is generally greater than 6' |
2W | ||||||
10B Mongle
loam,
(0-7%)
brief ponding,
(D) |
Very deep, somewhat |
IV W - very poor potential; prolonged high water table |
IV - very poor: landscape position and prolonged high water table |
IV - grassland agriculture |
|||
| depth to hard bedrock is generally greater than 5' |
4W | ||||||
12B
Rohrersville
cobbly loam,
(1-7%)
brief ponding,
(C) |
Very deep, somewhat |
IV W - very poor potential; seasonal water table |
IV - very poor: landscape position and prolonged high water table |
IV - grassland agriculture |
|||
| depth to hard bedrock is generally greater than 5' |
3W | ||||||
13B Morven silt loam, (1-8%) (B) |
Very deep, well drained yellowish-red and reddish-brown silty soils with intermittent seasonal water tables in concave positions (swales); developed in recent colluvium of soils derived from calcareous conglomerate |
IV G - very poor solution weathering/ collapse of underlying calcareous materials; pollution by sinkholes & rock outcrops |
IV - very poor: landscape position and groundwater pollution |
I - prime farmland cropland |
|||
| depth to hard bedrock is generally greater than 5' |
2E | ||||||
14B Manassas silt loam, (1-8%) (B) |
Very deep, well to moderately well drained brown to reddish-brown silty soils with intermittent seasonal water tables in concave upland positions (swales); developed in recent colluvium of soils derived from Truassuc siltstone and shale |
II W - fair potential; low bearing capacity & short duration perched water tables |
IV - very poor: landscape position and flooding potential |
II - secondary cropland |
|||
| depth to hard bedrock is generally greater than 5' |
2E | ||||||
17B Middleburg silt loam, (1-7%) (B) |
Very deep, well drained yellowish- brown to brown loamy soils with intermittent seasonal water tables in concave upland positions (swales); developed in recent colluvium of soils derived from mixed acid and basic rock |
III W - poor potential; short duration water tables |
IV - very poor: landscape position and short duration water tables |
I - prime farmland |
|||
| depth to hard bedrock is generally greater than 5' |
2E | ||||||
20B Purcellville and Tankerville soils, (2-7%) (B) |
complex of very deep, well drained yellowish-red silty Purcellville and moderately deep well drained, yellowish- brown loamy soils on convex upland positions; developed in residuum weathered from mixed granite gneiss and metadiabase rock |
II R - fair potential; depth to rock |
II - fair potential: depth to rock |
II - secondary cropland |
|||
| depth to hard bedrock is generally greater than 6' in Purcellville and greater than 30" in Tankerville |
2E, 3S | ||||||
20C Purcellville and Tankerville soils, (7-15%) (B) |
complex of very deep, well drained yellowish-red silty Purcellville and moderately deep well drained, yellowish- brown loamy soils on convex upland positions; developed in residuum weathered from mixed granite gneiss and metadiabase rock |
II R - fair potential; depth to rock |
II - fair potential: depth to rock |
II - secondary cropland |
|||
| depth to hard bedrock is generally greater than 6' in Purcellville and greater than 30" in Tankerville |
3E, 4S | ||||||
20D Purcellville and Tankerville soils, (15-25%) (C) |
complex of very deep, well drained yellowish-red silty Purcellville and moderately deep well drained, yellowish- brown loamy soils on convex upland positions; developed in residuum weathered from mixed granite gneiss and metadiabase rock |
II R - fair potential; depth to rock |
III - poor potential: depth to rock and slope |
IV - grassland agriculture |
|||
| depth to hard bedrock is generally greater than 6' in Purcellville and greater than 30" in Tankerville |
4E, 4S | ||||||
20E Purcellville and Tankerville soils, (25-45%) (C) |
complex of very deep, well drained yellowish-red silty Purcellville and moderately deep well drained, yellowish- brown loamy Tankerville soils on convex upland positions; developed in residuum weathered from mixed granite gneiss and metadiabase rock |
II RS - poor potential; steep slope depth to rock |
IV - very poor or no potential; steep slopes and depth to rock |
V - forestry and wildlife |
|||
| depth to hard bedrock is generally greater than 6' in Purcellville and greater than 30" in Tankerville |
6E, 6S | ||||||
22B Purcellville- Swampoodle Complex, (2-7%) (B) |
complex of very deep, well drained yellowish-red silty Purcellville and very deep moderately well drained, strong brown and mottled strong brown and gray silty Swampoodle soils in broad, nearly level to concave upland positions; developed in residuum weathered from mixed granite gneiss and metadiabase rock |
II WP - fair potential; seasonal water table |
II - poor potential; seasonal water table, slow permeability |
II - secondary cropland |
|||
| depth to hard bedrock is generally greater than 5' |
2E, 4W | ||||||
23B Purcellville silt loam, (2-7%) (B) |
very deep, well drained yellowish-red silty to loamy soil on undulating and gently sloping uplands; developed in residuum weathered from mixed granite gneiss and metadiabase rock |
I - good potential | I- good potential | I - prime farmland |
|||
| depth to hard bedrock is generally greater than 6' |
2E | ||||||
27C Airmont very flaggy loam, (7-15%) (B) |
very deep, moderately well drained yellowish-brown loamy soil with intermittent perched water tables and stones on moderately steep concave mountain slopes and benches; developed in local colluvium weathered from coarse grained rocks like sandstone, quartzite and charnokite |
IV W - very poor potential; seasonal water table |
IV- very poor; landscape position, fragipans and prolonged high water table |
V - forestry and wildlife |
|||
| depth to hard bedrock is generally greater than 5' |
5S | ||||||
28B Eubanks loam, (2-7%) (B) |
very deep, well drained reddish- yellow to red loamy soil on undulating and gently sloping uplands; developed in residuum weathered from mixed gneiss, metadiabase and other metamorphosed grantic rocks |
I - good potential | I - good potential | I - prime farmland |
|||
| depth to hard bedrock is generally greater than 6' |
2E | ||||||
28C Eubanks loam, (7-15%) (C) |
very deep, well drained yellowish-red to red loamy soil on undulating and sloping uplands; developed in residuum weathered from mixed gneiss, metadiabase and other metamorphosed grantic rocks |
I - good potential | I - good potential | II - secondary cropland |
|||
| depth to hard bedrock is generally greater than 6' |
3E | ||||||
29B Eubanks loam, stony (2-7%) (B) |
very deep, well drained yellowish-red to red loamy soil on undulating and gently sloping uplands; developed in stony residuum weathered from mixed gneiss, metadiabase and other metamorphosed grantic rocks |
I - good potential | I - good potential | II - secondary cropland |
|||
| depth to hard bedrock is generally greater than 6' |
3S | ||||||
29C Eubanks loam, stony (7-15%) (C) |
very deep, well drained yellowish-red to red loamy soil on undulating and sloping uplands; developed in residuum weathered from mixed gneiss, metadiabase and other metamorphosed grantic rocks |
I - good potential | I - good potential | III - prime orchard |
|||
| depth to hard bedrock is generally greater than 6' |
4S | ||||||
29D Eubanks loam, stony (15-25%) (C) |
very deep, well drained yellowish-red to red loamy soil on sloping uplands; developed in residuum weathered from mixed gneiss, metadiabase and other metamorphosed grantic rocks |
I - good potential | II - fair potential; slope |
III - prime orchard |
|||
| depth to hard bedrock is generally greater than 6' |
5S | ||||||
30C Tankerville and Philomont soils (7-15%) (B) |
complex of moderately deep well drained, yellowish- brown loamy Tankerville soils and very deep, well drained yellowish- brown loamy Philomont on convex upland sideslopes; developed in residuum weathered from coarse grained granite gneiss |
II R - fair potential; depth to rock |
II - fair potential; depth to rock |
II - secondary cropland |
|||
| depth to hard bedrock is generally greater than 6' in Philomont and greater than 30" in Tankerville |
4S, 3E | ||||||
30D Tankerville and Philomont soils (15-25%) (C) |
complex of moderately deep well drained, yellowish- brown loamy Tankerville soils and very deep, well drained yellowish- brown loamy Philomont on convex upland sideslopes; developed in residuum weathered from coarse grained granite gneiss |
II R - fair potential; depth to rock |
II - fair potential; depth to rock |
II - secondary cropland |
|||
| depth to hard bedrock is generally greater than 6' in Philomont and greater than 30" in Tankerville |
4S, 3E | ||||||
31B Philomont and Tankerville soils (2-7%) (C) |
complex of very deep, well drained, yellowish-brown loamy Philomont and moderately deep well drained yellowish- brown Tankerville soils on convex upland positions; developed in residuum weathered from coarse grained granite gneiss |
I - good potential | I - good potential | I - prime farmland |
|||
| depth to hard bedrock is generally greater than 6' |
2S, 3S | ||||||
38B Swampoodle silt loam (1-7%) brief ponding (C) |
very deep, moderately well drained, strong brown and mottled strong brown and gray silty soils with seasonal water tables in broad, nearly level to concave upland positions; developed in residuum derived from mixed acid and basic rock |
IV WP - very poor potential; seasonal high water table and areas of shrink- swell clays |
IV - very poor; landscape position and prolonged high water table |
IV - grassland agriculture |
|||
| depth to hard bedrock is generally greater than 5' |
4W | ||||||
40C Catoctin channery silt loam, (7-15%) (C) |
moderately deep, well drained, strong brown, shaley/silty soil with few rock outcrops and common flag stones on convex sideslopes; developed from greenstone schist |
II R - fair potential; depth to rock |
III - poor potential; depth to rock and slope |
IV - grassland agriculture |
|||
| depth to hard bedrock ranges between 2-4' |
3E | ||||||
40D Catoctin channery silt loam, (15-25%) (C) |
moderately deep, well drained strong brown, shaley/silty soil with few rock outcrops and common flag stones on moderately steep convex sideslopes; developed from greenstone schist |
II R - fair potential; depth to rock |
III - poor potential; depth to rock and slope |
V - forestry and wildlife |
|||
| depth to hard bedrock ranges between 2-4' |
4E | ||||||
40E Catoctin channery silt loam, (25-45%) (C) |
moderately deep, well drained strong brown, shaley/silty soil with few rock outcrops and common flag stones on steep convex sideslopes; developed from greenstone schist |
II RS - fair potential; depth to rock |
IV - very poor or no potential; depth to rock and slope |
V - forestry and wildlife |
|||
| depth to hard bedrock ranges between 2-4' |
7E | ||||||
43B Myersville- Catoctin Complex, (2-7%) (B) |
complex of deep, well drained yellowish-red loamy Myersville and moderately deep, well drained, strong brown, shaly/silty Catoctin soils on gently rolling convex landscapes; developed from greenstone schist |
I - good potential | II - fair potential; moderate permeability |
I - prime farmland |
|||
| depth to hard bedrock is generally greater than 4' in Myersville and 2 to 4' in Catoctin |
2E, 3E | ||||||
43C Myersville- Catoctin Complex, (7-15%) (C) |
complex of deep, well drained yellowish-red loamy Myersville and moderately deep, well drained, strong brown, shaly/silty Catoctin soils on rolling convex sideslopes; developed from greenstone schist |
II R - fair potential; depth to rock |
II - fair potential; moderate permeability and depth to rock |
II - secondary cropland |
|||
| depth to hard bedrock is generally greater than 4' in Myersville and 2 to 4' in Catoctin |
3E, 4E | ||||||
45B Fauquier silt loam, (2-7%) (C) |
very deep well drained red clayey soils on gently sloping uplands in dissected landforms; developed from greenstone schist |
I - good potential | I - fair potential; moderate permeability |
I - prime farmland |
|||
| depth to hard bedrock is generally greater than 5' |
2E | ||||||
45C Fauquier silt loam, (7-15%) (C) |
very deep well drained red clayey soils on gently sloping uplands in dissected landforms; developed from greenstone schist |
I - good potential | I - fair potential; moderate permeability |
II - secondary cropland |
|||
| depth to hard bedrock is generally greater than 5' |
3E | ||||||
50C Stumptown flaggy loam, (7-15%) (C) |
moderately deep, well to excessively drained skeletal yellowish-brown loamy soils with many quartzite flagstones and boulders on mountain ridgetops |
III RS - fair potential; shallow to rock |
III - poor potential; shallow to rock |
V- forestry and wildlife |
|||
| depth to hard bedrock ranges from 20 to 40" |
4S | ||||||
50D Stumptown flaggy loam, (15-25%) (C) |
moderately deep, well to excessively drained skeletal yellowish-brown loamy soils with many quartzite flagstones and boulders on moderately steep mountain sideslopes |
II RS - fair potential; shallow to rock and steep slopes |
III - poor potential; shallow to rock and steep slopes |
V- forestry and wildlife |
|||
| depth to hard bedrock ranges from 20 to 40" |
6S | ||||||
51E Stumptown- Rock outcrop complex (25-45%) (D) |
moderately deep, well to excessively drained skeletal yellowish-brown loamy soils with many quartzite outcrops, flagstones and boulders on sloping to steep mountain sideslopes |
II RS - fair potential; shallow to rock and steep slopes |
IV - very poor or no potential; shallow to rock and steep slopes |
V- forestry and wildlife |
|||
| depth to hard bedrock ranges from 20 to 40" |
7E,8 | ||||||
52C Cardiff Channery silt loam, (7-15%) (B) |
deep, well drained yellowish-brown loamy soils with common quartzite flagstones and boulders on mountain sideslopes and ridgetops |
I - good potential | I - good potential | IV- grassland agriculture |
|||
| depth to hard bedrock ranges from 40 to 60" |
3E | ||||||
52D Cardiff Channery silt loam, (15-25%) (C) |
deep, well drained yellowish-brown loamy soils with common quartzite flagstones and boulders on mountain sideslopes and ridgetops |
II RS - fair potential; depth to rock and steep slopes |
II - fair potential; depth to rock and steep slopes |
V- forestry and wildlife |
|||
| depth to hard bedrock ranges from 40 to 60" |
4E | ||||||
52E Cardiff Channery silt loam, (25-45%) (C) |
deep, well drained yellowish-brown loamy soils with common quartzite flagstones and boulders on mountain sideslopes and ridgetops |
IV RS - very poor potential; depth to rock and steep slopes |
IV - very poor or no potential; depth to rock and steep slopes |
V- forestry and wildlife |
|||
| depth to hard bedrock ranges from 40 to 60" |
6E | ||||||
55B Glenelg silt loam, (2-7%) (A) |
deep, well drained yellowish-red loamy soils with common quartz stones on convex upland and mountain sideslopes and ridgetops |
I - good potential | I - good potential | I- prime farmland |
|||
| depth to hard bedrock is generally greater than 4' |
2E | ||||||
55C Glenelg silt loam, (7-15%) (B) |
deep, well drained yellowish-red loamy soils with common quartz stones on convex upland and mountain sideslopes and ridgetops |
I - good potential | I - good potential | II- secondary cropland |
|||
| depth to hard bedrock is generally greater than 4' |
3E | ||||||
55D Glenelg silt loam, (15-25%) (C) |
deep, well drained yellowish-red loamy soils with common quartzite flagstones and boulders on mountain sideslopes and ridgetops |
II S - fair potential; slope |
II - fair potential; slope |
IV- grassland agriculture |
|||
| depth to hard bedrock ranges from 40 to 60" or more |
4E | ||||||
59C Airmont loam, very rubbly (7-15%) (D) |
very deep, moderately well drained yellowish-brown bouldery loamy soil with intermittent perched water tables and stones on sloping to moderately steep concave mountain slopes (swales); developed in stony and bouldery local colluvium weathered from coarse grained rocks like sandstone, quartzite and charnokites |
IV WG - very poor potential; seasonal water table, landscape and stones, slippage potential |
IV - very poor; landscape position, stones and prolonged high water table |
V- forestry and wildlife |
|||
| depth to hard bedrock is generally greater than 5' |
7S | ||||||
60C Sycoline- Catlett complex (7-15%) (C/D) |
complex of moderately deep, moderately well drained yellowish- brown silty (sycoline) and shallow, well drained grayish-brown skeletal (Catlett) soils with perched seasonal water tables on convex side slopes; developed from hornfel and granulites |
II R - fair potential; shallow soils over rock |
IV - very poor potential; shallow to rock |
IV- grassland agriculture |
|||
| depth to hard bedrock generally ranges between 20 to 40" in Sycoline and 10 to 30" in Catlett |
3E, 6S | ||||||
60D Catlett gravely silt loam (15-25%) (C/D) |
moderately deep to shallow well drained grayish-brown silty skeletal seasonal perched seasonal water tables on moderately steep side slopes; developed from hornfel and granulites |
III RS - poor potential; shallow to rock and steep slopes |
IV - very poor potential; shallow to rock and steep slopes |
IV- grassland agriculture |
|||
| depth to hard bedrock generally ranges between 10 to 30" |
6S | ||||||
60E Catlett Rock outcrop complex, (25-45%) (D) |
moderately deep to shallow well drained grayish-brown silty skeletal soils with many rock outcrops, stones, gravels and boulders on steep to very steep side slopes; developed from hornfel and granulites |
IV S - very poor potential; shallow to rock and steep slopes |
IV - very poor or no potential; shallow to rock and steep slopes |
V- forestry and wildlife |
|||
| depth to hard bedrock generally ranges between 10 to 30" |
7S, 8 | ||||||
62B Kelly- Sycoline complex, (3-8%) (D/C) |
complex of moderately deep, moderately well to somewhat poorly drained yellowish- brown silty (Sycoline) soils; and deep, somewhat poorly drained gray and grayish-brown clayey (Kelly) soils with sesonal perched water table on gently sloping to nearly level ridge crests; developed from hornfel and granulites |
III WP - poor potential; high shrink-swell clays and moderate duration perched water table |
III - poor potential; high water tables |
II- secondary cropland |
|||
| depth to hard bedrock generally ranges 40 to 60" in Kelly and 20 to 40" in Sycoline |
2E, 4W | ||||||
63A Kelly silt loam, (0-3%) (D) |
deep somewhat poorly drained gray and grayish-brown claypan soils with sesonal water tables on gently sloping to nearly level uplands with low relief; developed from hornfel and granulites |
IV PW - very poor potential; high shrink-swell clays and prolonged perched water table |
IV - very poor potential; high water table |
IV- grassland agriculture |
|||
| depth to hard bedrock generally ranges 40 to 60" |
4W | ||||||
64B Legore loam, (3-8%) (B) |
well drained very deep brown to reddish- brown loamy soils with few stones and rock outcrop on gently sloping uplands; developed from diabase or basalt |
II R - fair potential; rock outcrops |
II - fair potential | II- secondary cropland |
|||
| depth to hard bedrock is generally greater than 5' |
6S | ||||||
64C Legore loam, (8-15%) (B) |
well drained very deep brown to reddish- brown loamy soils with common stones and few rock outcrop on side slopes; developed from diabase or basalt |
II R - fair potential; rock outcrops |
II - fair potential | IV - grassland agriculture |
|||
| depth to hard bedrock is generally greater than 5' |
7S | ||||||
64D Oakhill gravely silt loam, very stony (15-25%) (C) |
well to excessively drained moderately deep brown to yellowish-red loam skeletal soils with many rock outcrop and stones on moderately steep side slopes; developed from diabase or basalt |
III RS - poor potential; rock outcrops and steep slopes |
III - poor potential; steep slopes and shallow to rock |
IV - grassland agriculture |
|||
| depth to hard bedrock generally ranges between 20 to 40" |
7S | ||||||
65B Montalto silty clay loam, (3-8%) (C) |
deep to very deep well drained red clayey soils with common to many stones and boulders on convex gently sloping uplands in rolling landforms; developed from diabase or basalt |
I - good potential | I - good potential | II- secondary cropland |
|||
| depth to hard bedrock is generally greater than 5' |
2E | ||||||
66A Waxpool silt loam, (0-3%) ponding (D) Hydric soil |
very deep somewhat poorly to poorly drained gray and brown clayey soils with seasonal perched water tables on nearly level upland flats; developed from diabase |
IV PW - very poor potential; high shrink-swell clays and prolonged perched water table |
IV - very poor potential; high water table shrink-swell clays |
IV - grassland agriculture |
|||
| depth to hard bedrock is generally greater than 6' |
4W | ||||||
67B Haymarket and Jackland soils, (2-8%) (D) |
complex of very deep moderately well drained yellowish- brown to olive-brown (Jackland) and well drained strong brown (Haymarket) soils with perched water tables on convex ridgetops and side slopes over diabase and some basalt |
IV P - very poor potential; high shrink-swell clays and seasonal perched water table |
IV - very poor potential; high water tables, shrink-swell clays |
II- secondary cropland |
|||
| depth to hard bedrock is generally greater than 5' |
5E, 5W | ||||||
67C Haymarket and Jackland soils, (8-15%) (D) |
complex of very deep moderately well drained yellowish- brown to olive-brown (Jackland) and well drained strong brown (Haymarket) claypan soils with perched water tables on convex sloping side slopes in dissected landforms; developed from diabase |
IV P - very poor potential; high shrink-swell clays and seasonal perched water table |
IV - very poor potential; high water tables, shrink-swell clays |
IV- grassland agriculture |
|||
| depth to hard bedrock is generally greater than 5' |
5E, 5W | ||||||
68C Haymarket and Jackland soils, very stony (8-15%) (D) |
complex of very deep stony moderately well drained yellowish- brown to olive-brown (Jackland) and strong brown (Haymarket) claypan soils with perched water tables and common rock outcrop on convex sloping side slopes; developed from diabase |
IV P - very poor potential; wetness and high shrink-swell clays |
IV - very poor potential; high water tables and high shrink-swell clays |
V- forestry and wildlife |
|||
| depth to hard bedrock is generally greater than 5' |
5S, 5S | ||||||
69A Elbert silty clay loam, (0-3%) ponding (D) Hydric soil |
very deep poorly drained soil in drainageways; developed from diabase and basalt |
IV PW - very poor potential; wetness and high shrink-swell clays |
IV - very poor potential; high water table and shrink-swell clays |
IV - grassland agriculture |
|||
| depth to hard bedrock is generally greater than 6' |
5W | ||||||
70B Leedsville cobbly silt loam, (3-8%) (B) |
very deep well drained cobbly yellowish-red and red fine loamy soils on convex gently sloping uplands; developed from residuum of Goose Creek conglomerate |
I - good potential | I - good potential | I - prime farmland |
|||
| depth to hard bedrock is generally greater than 6' |
3S | ||||||
70C Leedsville cobbly silt loam, (8-15%) (B) |
very deep well drained cobbly yellowish-red and red fine loamy soils on convex gently sloping uplands; developed from residuum of Goose Creek conglomerate |
I - good potential | I - good potential | I - prime farmland |
|||
| depth to hard bedrock is generally greater than 6' |
4S | ||||||
71B Panorama silt loam, (3-8%) (B) |
deep well drained reddish-brown silty soils on convex ridge crests and side slopes; developed from fluvium over Triassic siltstones and shales |
I - good potential | I - good potential | I - prime farmland |
|||
| depth to hard bedrock is generally greater than 6' |
2E | ||||||
72C Birdsboro loam, (8-15%) (B) |
very deep well drained red and yellowish-red fine-loamy soils on convex and straight side slopes; developed from thin river terrace deposits over siltstone |
I - good potential; few problems |
II - fair potential | II - secondary cropland |
|||
| depth to hard bedrock is generally greater than 5' |
3E | ||||||
73B Penn silt loam, (3-8%) (C) |
moderately deep well drained silty soils on sloping convex landscapes; developed from Triassic siltstones and shales |
I - good potential; few problems |
III - poor potential; perched water tables |
II - secondary cropland |
|||
| depth to hard bedrock generally ranges 20 to 40" |
2E | ||||||
73C Penn silt loam, (8-15%) (C) |
moderately deep well drained silty soils on sloping convex landscapes; developed from Triassic siltstones and shales |
I - good potential; few problems |
III - poor potential; shallow to rock |
IV - grassland agriculture |
|||
| depth to hard bedrock generally ranges 20 to 40" |
3E | ||||||
74B Ashburn silt loam, (1-8%) (C) |
moderately deep moderately well drained yellowish- brown silty soils with seasonal perched water tables on level to gently sloping landscapes; developed from thin fluvial cappings over Triassic siltstones |
II WP - fair potential; wetness and low bearing capacity |
III - poor potential; perched water table |
II - secondary cropland |
|||
| depth to hard bedrock generally ranges 20 to 40" |
2W | ||||||
76B Sudley- Oatlands Complex, (3-8%) (B) |
complex of very deep (Sudley) and moderately deep (Oatlands) well drained strong brown to reddish-brown loamy soils on gently sloping convex ridgetops and upper side slopes; developed from Triassic sandstones and red conglomerates |
I - good potential | I - good potential | I - prime farmland |
|||
| depth to hard bedrock is generally greater than 6' in Sudley and 20 to 40" in Oatlands |
2E, 3S | ||||||
76C Oatlands gravelly silt loam, (8-15%) (B) |
moderately deep well drained strong brown to reddish-brown loamy soils on sloping convex side slopes; developed from Triassic sandstones and red conglomerates |
I - good potential; few problems |
II - fair potential | II - secondary cropland |
|||
| depth to hard bedrock is generally greater than 20 to 40" |
4S | ||||||
76D Oatlands gravelly silt loam, (15-25%) (C) |
moderately deep well drained strong brown to reddish-brown loamy soils on sloping convex side slopes; developed from Triassic sandstones and red conglomerates |
II S - fair potential; steep slopes and subject to erosion |
III - poor potential; steep slopes and shallow to rock |
V - forestry and wildlife |
|||
| depth to hard bedrock is generally greater than 20 to 40" |
4E | ||||||
77C3 Nestoria gravelly silt loam, severely eroded (8-15%) (C) |
shallow, well to excessively drained, eroded reddish-brown loamy-skeletal soils on steep convex slopes in highly dissected terrain with gullies; developed from Triassic sandstones/siltstones and shales |
II R - fair potential; shallow to shale and siltsone; little soil material available for landscaping or grading |
III - poor potential; shallow to rock |
IV - grassland agriculture |
|||
| depth to rippable bedrock is generally less than 20" and hard bedrock is greater than 4' |
4E | ||||||
77D3 Nestoria gravelly silt loam, severely eroded (15-25%) (D) |
shallow, well to excessively drained, eroded reddish-brown loamy-skeletal soils on steep convex slopes in highly dissected terrain with gullies; developed from Triassic sandstones/siltstones and shales |
III RS - poor potential; shallow soils over rock and steep slopes |
IV - very poor potential; shallow to rock and steep slopes |
V - forestry and wildlife |
|||
| depth to rippable bedrock is generally less than 20" and hard bedrock is greater than 4' |
6E | ||||||
77E3 Nestoria gravelly silt loam, severely eroded (25-45%) (D) |
shallow excessively drained eroded reddish-brown loamy- skeletal soils with gullies on steep slopes along drainageways; developed from Triassic sandstones/siltstones/ shales |
IV RS - very poor potential; steep slopes and rock outcrops |
IV - very poor or no potential; steep slopes and shallow to rock |
V - forestry and wildlife |
|||
| depth to rippable bedrock is generally less than 20" and hard bedrock is greater than 4' |
7E | ||||||
78A Dulles silt loam, (0-3%) (C) |
deep moderately well to somewhat poorly drained yellowish- brown mottled with gray clayey soils with seasonal perched water tables on nearly level landscapes; developed from fluvial cappings overlying siltstone and shales |
IV W - very poor potential; low soils strength and prolonged perched water table |
IV - very poor potential; low soil strength and prolonged perched water table |
II - secondary cropland |
|||
| depth to hard bedrock generally ranges 40 to 60" |
4W | ||||||
79A Albano silt loam, (0-3%) brief ponding (D) Hydric soil |
deep poorly drained mottled yellowish- brown and gray clayey soils with seasonal perched water tables in concave landscapes (swales); developed in colluvium and local alluvium of soils derived from Triassic siltstones and shales |
IV W - very poor potential; seasonal perched water tables |
IV - very poor potential; high water tables |
IV - grassland agriculture |
|||
| depth to hard bedrock generally ranges 40 to 60" |
4W | ||||||
80B Brentsville loam, (3-8%) (B) |
moderately deep well drained brown to reddish-brown loamy soils on gently sloping ridge crests and upper side slopes; developed from Triassic acid (arkosic) sandstones and pebbly conglomerate |
I - good potential | II- fair potential; depth to rock |
IV - grassland agriculture |
|||
| depth to hard bedrock generally ranges 20 to 40" |
2E | ||||||
80C Brentsville loam, (8-15%) (B) |
moderately deep well drained brown to reddish-brown loamy soils on sloping side slopes in dissected landscapes; developed from Triassic acid (arkosic) sandstones and pebbly conglomerate |
II R - fair potential; depth to rock |
II- fair potential | IV - grassland agriculture |
|||
| depth to hard bedrock generally ranges 20 to 40" |
3E | ||||||
81B Brumbaugh cobbly silt loam, (2-7%) (B) |
very deep moderately well drained gravelly strong brown to yellowish-red loamy soils with discontinuous perched water tables on gently sloping mountain toe slopes and foot slopes; developed from old mountain colluvium derived from acidic rocks |
II W - fair potential; perched water tables |
III- poor potential; high water tables |
II - secondary cropland |
|||
| depth to hard bedrock is generally greater than 6' |
3E | ||||||
81C Brumbaugh cobbly silt loam, (7-15%) (B) |
very deep moderately well drained gravelly strong brown to yellowish-red loamy soils with discontinuous perched water tables on flat to concave sloping mountain toe slopes and foot slopes; developed from old mountain colluvium acidic rocks |
II W - fair potential; perched water tables |
III- poor potential | II - secondary cropland |
|||
| depth to hard bedrock is generally greater than 6' |
3E | ||||||
82B Scattersville silt loam, (1-7%) brief ponding (D) |
very deep somewhat poorly to poorly drained gravelly yellowish-brown mottled strong brown and gray loamy soils on gently sloping concave lowlands along drainageways at the base of the mountains; developed from old mountain colluvium of mixed acid and basic rocks |
IV W - very poor potential; perched water tables |
IV- very poor potential; high water tables |
IV - grassland agriculture |
|||
| depth to hard bedrock is generally greater than 6' |
4W | ||||||
83B Braddock cobbly loam, (2-7%) (B) |
very deep well drained gravelly red clayey soils on convex gently sloping mountain side slopes and foot slopes in rolling landforms; developed from old mountain colluvium derived from acidic rocks |
I - good potential | II- fair potential; moderate permeability |
II - secondary cropland |
|||
| depth to hard bedrock is generally greater than 6' |
2S | ||||||
83C Braddock cobbly loam, (7-15%) (B) |
very deep well drained gravelly red clayey soils on convex gently sloping mountain side slopes and foot slopes in rolling landforms; developed from old mountain colluvium derived from acidic rocks |
I - good potential | II- fair potential; moderate permeability |
II - secondary cropland |
|||
| depth to hard bedrock is generally greater than 6' |
3S | ||||||
84B Lucketts silt loam, (2-7%) (B) |
very deep well drained yellowish-red to red clayey soils on undulating upland with low relief; developed partly from alluvial/colluvial cappings and partly from residuum of calcareous conglomerate |
II G - fair potential; solution channels may cause collapse and/or ground water pollution evaluate by geotechnical investigation |
II- fair potential; moderate permeability above discontinuity |
II - secondary cropland |
|||
| depth to hard bedrock is generally greater than 6' |
2E | ||||||
84C Lucketts silt loam, (7-15%) (B) |
very deep well drained yellowish-red to red clayey soils on undulating upland with low relief; developed partly from alluvial/colluvial cappings and partly from residuum of calcareous conglomerate |
II G - fair potential; solution channels may cause collapse and/or ground water pollution |
II- fair potential; moderate permeability above discontinuity |
II - secondary cropland |
|||
| depth to hard bedrock is generally greater than 6' |
3E | ||||||
88C Lew channery silt loam, stony (7-15%) (B) |
very deep well drained brown soils on concave sloping side slopes in depressions and on benches on mountain side slopes; developed from recent mountain colluvium derived from greenstone rock materials |
IV G - very poor potential; subject to slippage and unstable when cut |
III- poor potential | V - forestry and wildlife |
|||
| depth to hard bedrock is generally greater than 6' |
3E | ||||||
88D Lew channery silt loam, stony (15-25%) (C) |
very deep well drained brown soils on concave sloping side slopes in depressions and on benches on mountain side slopes; developed from recent mountain colluvium derived from greenstone rock materials |
IV G - very poor potential; subject to slippage and unstable when cut |
III- poor potential; steep slopes, questionable landscape position and laterally moving water |
V - forestry and wildlife |
|||
| depth to hard bedrock is generally greater than 6' |
6E | ||||||
89D Weverton very flaggy silt loam, (15-25%) (C) |
deep, well drained yellowish-brown loamy soil with many quartzite flagstone on moderately steep mountain side slopes; developed from colluvium and residuum of quartzite |
IV G - very poor potential; slippage. mountain colluvium deposits may be unstable when cut (graded); proposals for development should be based on a geotechnical investigation |
II- fair potential; moderate permeability; depth to rock |
V - forestry and wildlife |
|||
| depth to hard bedrock is generally ranges 40 to 60" |
7S | ||||||
89E Weverton very flaggy silt loam, (25-45%) (C) |
deep, well drained yellowish-brown loamy soil with many quartzite flagstone on moderately steep mountain side slopes; developed from colluvium and residuum of quartzite |
IV G - very poor potential; slippage. mountain colluvium deposits may be unstable when cut (graded); proposals for development should be based on a geotechnical investigation |
IV- very poor or no potential; steep slope |
V - forestry and wildlife |
|||
| depth to hard bedrock is generally ranges 40 to 60" |
7S | ||||||
90B Springwood silt loam, (3-8%) (B) |
very deep, well drained reddish-brown to red clayey soils on undulating uplands; developed from calcareous conglomerate |
III G - poor potential; potential for collapse from underlying channels; proposals for development should be based on a geotechnical investigation |
II- fair potential; pollution potential from sink holes/solution channels |
I - prime farmland |
|||
| depth to hard bedrock is generally greater than 6' |
2E | ||||||
91B Springwood- Rock outcrop complex, (3-8%) (B) |
very deep, well drained reddish-brown to red clayey soils with numerous rock outcrops and sinkholes on undulating uplands; developed from calcareous conglomerate |
IV G - very poor; solution weathering collapse of underlying calcareous materials and potential groundwater pollution by sinkholes rock outcrops; evaluate by geotechnical investigation |
IV- very poor potential; pollution potential from sinkholes and rock outcrops |
V - forestry and wildlife |
|||
| depth to hard bedrock is generally greater than 6' |
2E, 8 | ||||||
91C Springwood- Rock outcrop complex, (8-15%) (B) |
very deep, well drained reddish-brown to red clayey soils with numerous rock outcrops and sinkholes on sloping side slopes in dissected landscapes; developed from calcareous conglomerate |
IV G - very poor; solution weathering collapse of underlying calcareous materials and potential groundwater pollution by sinkholes rock outcrops; evaluate by geotechnical investigation |
IV- very poor potential; pollution potential from sinkholes and rock outcrops |
V - forestry and wildlife |
|||
| depth to hard bedrock is generally greater than 6' |
3E, 8 | ||||||
93B Hibler silt loam, (0-5%) rarely flooded (B) |
very deep, moderately well drained yellowish-red loamy and silty soils with gray in the lower part and seasonal high water tables on convex river terrace positions; developed from alluvium of soils derived from sedimentary rock |
II FW - fair potential; high sesonal water table, flooding |
III- poor potential; moderate permeability and high water table |
I - prime farmland |
|||
| depth to hard bedrock is generally greater than 6' |
2E | ||||||
94B Allegheny silt loam, (0-5%) rarely flooded (A) |
very deep, well drained brown to yellowish- red loamy and silty soils with short duration perched water tables on convex river terrace positions; developed from alluvium of soils derived from sedimentary rock |
II FW - fair potential; rare flooding |
II- fair potential; moderate permeability |
I - prime farmland |
|||
| depth to hard bedrock is generally greater than 6' |
2E | ||||||
95B Goresville gravelly silt loam, (0-5%) (B) |
very deep, well drained red and yellowish-red clayey soils on convex high river terrace positions; developed from old alluvium of soils derived from sedimentary rock |
I - good potential | I - good potential | I - prime farmland |
|||
| depth to hard bedrock is generally greater than 6' |
2E | ||||||
98B Captina silt loam, (1-8%) (C) |
very deep moderately well to somewhat poorly drained yellowish-brown or mottled brown/gray and red clayey soils with fragipans and perched water tables on nearly level river terraces; developed from old alluvium of soils derived from sedimentary rock |
III W - poor potential; perched water tables |
IV - very poor potential; perched water tables |
IV - grsssland agriculture |
|||
| depth to hard bedrock is generally greater than 6' |
4W | ||||||
99A Kinkora- Delanco complex, (0-3%) rarely flooded Hydric soil (D/C) |
very deep poorly drained mottled gray clayey (Kinkora) and moderately well drained yellowish- brown loamy (Delanco) soils with a seasonal water table on concave to level terrace positions over siltstone |
IV FW - very poor potential; prolonged water table and high shrink-swell clays |
IV - very poor potential; water tables |
IV - grsssland agriculture |
|||
| depth to hard bedrock is generally greater than 6' |
2W | ||||||