HomeMy WebLinkAboutSP201300022 Study 2013-11-18 ,
s ALBEMARLE
FLWANNA
Thomas Jefferson Soil and Water Conservation District
706 Forest St, Ste G
Charlottesville, VA 22903
975-0224
Nov 18, 2013
TO: Sarah Baldwin
Planning Department
RE: Soils Report for:
Verizon — Hydraulic Rd (Comcast Property)
NOV 21 2013
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‘110° NIS
Map Unit Description(Brief,Generated)--Nremarle County,Virginia 'oe Verizon-Hydraulic-Comcast
Map Unit Description (Brief, Generated)
The map units delineated on the detailed soil maps in a soil survey represent the
soils or miscellaneous areas in the survey area. The map unit descriptions in this
report, along with the maps, can be used to determine the composition and
properties of a unit.
A map unit delineation on a soil map represents an area dominated by one or more
major kinds of soil or miscellaneous areas. A map unit is identified and named
according to the taxonomic classification of the dominant soils. Within a taxonomic
class there are precisely defined limits for the properties of the soils. On the
landscape, however, the soils are natural phenomena, and they have the
characteristic variability of all natural phenomena. Thus, the range of some
observed properties may extend beyond the limits defined for a taxonomic class.
Areas of soils of a single taxonomic class rarely, if ever, can be mapped without
including areas of other taxonomic classes. Consequently, every map unit is made
up of the soils or miscellaneous areas for which it is named and some minor
components that belong to taxonomic classes other than those of the major soils.
The Map Unit Description (Brief, Generated) report displays a generated
description of the major soils that occur in a map unit. Descriptions of non-soil
(miscellaneous areas) and minor map unit components are not included. This
description is generated from the underlying soil attribute data.
Additional information about the map units described in this report is available in
other Soil Data Mart reports, which give properties of the soils and the limitations,
capabilities, and potentials for many uses.Also, the narratives that accompany the
Soil Data Mart reports define some of the properties included in the map unit
descriptions.
Report—Map Unit Description (Brief, Generated)
Albemarle County, Virginia
Map Unit: 65B—Pacolet sandy loam, 2 to 7 percent slopes
Component: Pacolet(80%)
The Pacolet component makes up 80 percent of the map unit. Slopes are 2 to 7
percent.This component is on interfluves, uplands. The parent material consists of
residuum weathered from granite and gneiss. Depth to a root restrictive layer is
greater than 60 inches.The natural drainage class is well drained.Water movement
in the most restrictive layer is moderately high. Available water to a depth of 60
inches is moderate. Shrink-swell potential is low. This soil is not flooded. It is not
ponded. There is no zone of water saturation within a depth of 72 inches. Organic
matter content in the surface horizon is about 1 percent. Nonirrigated land capability
classification is 2e. This soil does not meet hydric criteria.
Map Unit: 65C—Pacolet sandy loam, 7 to 15 percent slopes
USDA Natural Resources Web Soil Survey 11/19/2013
Conservation Service National Cooperative Soil Survey Page 1 of 2
Map Unit Description(Brief,Generated)--Albem County,Virginia "%PO Verizon-Hydraulic-Comcast
Component: Pacolet(80%)
The Pacolet component makes up 80 percent of the map unit. Slopes are 7 to 15
percent.This component is on interfluves, uplands.The parent material consists of
residuum weathered from granite and gneiss. Depth to a root restrictive layer is
greater than 60 inches.The natural drainage class is well drained.Water movement
in the most restrictive layer is moderately high. Available water to a depth of 60
inches is moderate. Shrink-swell potential is low. This soil is not flooded. It is not
ponded. There is no zone of water saturation within a depth of 72 inches. Organic
matter content in the surface horizon is about 1 percent. Nonirrigated land capability
classification is 4e. This soil does not meet hydric criteria.
Data Source Information
Soil Survey Area: Albemarle County, Virginia
Survey Area Data: Version 9, Jan 20, 2010
USDA Natural Resources Web Soil Survey 11/19/2013
4" Conservation Service National Cooperative Soil Survey Page 2 of 2
Dwellings and Small Commercial Buildinga.soklbemarle County,Virginia `440,re Verizon-Hydraulic-Comcast
Dwellings and Small Commercial Buildings
Soil properties influence the development of building sites, including the selection
of the site,the design of the structure, construction, performance after construction,
and maintenance.This table shows the degree and kind of soil limitations that affect
dwellings and small commercial buildings.
The ratings in the table are both verbal and numerical. Rating class terms indicate
the extent to which the soils are limited by all of the soil features that affect building
site development. Not limited indicates that the soil has features that are very
favorable for the specified use. Good performance and very low maintenance can
be expected. Somewhat limited indicates that the soil has features that are
moderately favorable for the specified use. The limitations can be overcome or
minimized by special planning, design, or installation. Fair performance and
moderate maintenance can be expected. Very limited indicates that the soil has
one or more features that are unfavorable for the specified use. The limitations
generally cannot be overcome without major soil reclamation, special design, or
expensive installation procedures. Poor performance and high maintenance can
be expected.
Numerical ratings in the table indicate the severity of individual limitations. The
ratings are shown as decimal fractions ranging from 0.01 to 1.00. They indicate
gradations between the point at which a soil feature has the greatest negative
impact on the use (1.00) and the point at which the soil feature is not a limitation
(0.00).
Dwellings are single-family houses of three stories or less. For dwellings without
basements, the foundation is assumed to consist of spread footings of reinforced
concrete built on undisturbed soil at a depth of 2 feet or at the depth of maximum
frost penetration, whichever is deeper. For dwellings with basements, the
foundation is assumed to consist of spread footings of reinforced concrete built on
undisturbed soil at a depth of about 7 feet. The ratings for dwellings are based on
the soil properties that affect the capacity of the soil to support a load without
movement and on the properties that affect excavation and construction costs.The
properties that affect the load-supporting capacity include depth to a water table,
ponding, flooding, subsidence, linear extensibility (shrink-swell potential), and
compressibility. Compressibility is inferred from the Unified classification. The
properties that affect the ease and amount of excavation include depth to a water
table, ponding, flooding, slope, depth to bedrock or a cemented pan, hardness of
bedrock or a cemented pan, and the amount and size of rock fragments.
Small commercial buildings are structures that are less than three stories high and
do not have basements. The foundation is assumed to consist of spread footings
of reinforced concrete built on undisturbed soil at a depth of 2 feet or at the depth
of maximum frost penetration, whichever is deeper. The ratings are based on the
soil properties that affect the capacity of the soil to support a load without movement
and on the properties that affect excavation and construction costs. The properties
that affect the load-supporting capacity include depth to a water table, ponding,
flooding, subsidence, linear extensibility (shrink-swell potential), and
compressibility(which is inferred from the Unified classification).The properties that
affect the ease and amount of excavation include flooding, depth to a water table,
ponding, slope, depth to bedrock or a cemented pan, hardness of bedrock or a
cemented pan, and the amount and size of rock fragments.
tusrm Natural Resources Web Soil Survey 11/19/2013
Conservation Service National Cooperative Soil Survey Page 1 of 2
Dwellings and Small Commercial Buildings—AISIArle County,Virginia Verizon-Hydraulic-Comcast
Information in this table is intended for land use planning, for evaluating land use
alternatives, and for planning site investigations prior to design and construction.
The information, however, has limitations. For example, estimates and other data
generally apply only to that part of the soil between the surface and a depth of 5 to
7 feet. Because of the map scale, small areas of different soils may be included
within the mapped areas of a specific soil.
The information is not site specific and does not eliminate the need for onsite
investigation of the soils or for testing and analysis by personnel experienced in the
design and construction of engineering works.
Government ordinances and regulations that restrict certain land uses or impose
specific design criteria were not considered in preparing the information in this table.
Local ordinances and regulations should be considered in planning, in site
selection, and in design.
Report—Dwellings and Small Commercial Buildings
[Onsite investigation may be needed to validate the interpretations in this table and
to confirm the identity of the soil on a given site. The numbers in the value columns
range from 0.01 to 1.00. The larger the value, the greater the potential limitation.
The table shows only the top five limitations for any given soil. The soil may have
additional limitations]
Dwellings and Small Commercial Buildings-Albemarle County,Virginia
Map symbol and soil Pct.of Dwellings without basements Dwellings with basements Small commercial buildings
name map
unit Rating class and Value Rating class and Value Rating class and Value
limiting features limiting features limiting features
65B—Pacolet sandy
loam,2 to 7 percent
slopes
Pacolet 80 Not limited Not limited Somewhat limited
Slope 0.13
65C—Pacolet sandy
loam,7 to 15
percent slopes
Pacolet 80 Somewhat limited I Somewhat limited Very limited
Slope 0.37 Slope 0.37 Slope 1.00
Data Source Information
Soil Survey Area: Albemarle County, Virginia
Survey Area Data: Version 9, Jan 20, 2010
USDA Natural Resources Web Soil Survey 11/19/2013
Conservation Service National Cooperative Soil Survey Page 2 of 2
Physical Soil Properties—Albemarle Couflopo Virginia `al Verizon-Hydraulic-Comcast
Erosion factor T is an estimate of the maximum average annual rate of soil erosion
by wind and/or water that can occur without affecting crop productivity over a
sustained period. The rate is in tons per acre per year.
Wind erodibility groups are made up of soils that have similar properties affecting
their susceptibility to wind erosion in cultivated areas. The soils assigned to group
1 are the most susceptible to wind erosion, and those assigned to group 8 are the
least susceptible. The groups are described in the"National Soil Survey
Handbook."
Wind erodibility index is a numerical value indicating the susceptibility of soil to wind
erosion,or the tons per acre per year that can be expected to be lost to wind erosion.
There is a close correlation between wind erosion and the texture of the surface
layer, the size and durability of surface clods, rock fragments, organic matter, and
a calcareous reaction. Soil moisture and frozen soil layers also influence wind
erosion.
Reference:
United States Department of Agriculture, Natural Resources Conservation Service.
National soil survey handbook, title 430-VI. (http://soils.usda.gov)
USDA Natural Resources Web Soil Survey 11/19/2013
'ia. Conservation Service National Cooperative Soil Survey Page 3 of 4
Physical Soil Properties-Albemarle County,Vira
Report-Physical Soil Properties
Physical Soil Properties-Albemarle County,Virginia
Map symbol Depth Sand Silt Clay Moist Saturated Available Linear Organic Erosion
and soil name bulk hydraulic water extensibility matter factors
density conductivity capacity
Kw Kf
In Pct Pct Pct g/cc micro m/sec In/In Pct Pct
65B-Pacolet
sandy loam,2
to 7 percent
slopes
Pacolet 0-6 -67- -19- 8-14-20 1.00-1.50 14.00-42.00 0.08-0.12 0.0-2.9 0.5-2.0 .20 .20
6-32 -22- -28- 35-50-65 1.30-1.50 4.00-14.00 0.12-0.15 0.0-2.9 0.0-0.5 .28 .28
32-79 -60- -18- 15-23-30 1.20-1.50 4.00-14.00 0.08-0.15 0.0-2.9 0.0-0.5 .28 .28
65C-Pacolet
sandy loam,7
to 15 percent
slopes
Pacolet 0-6 -67- -19- 8-14-20 1.00-1.50 14.00-42.00 0.08-0.12 0.0-2.9 0.5-2.0 .20 .20
6-32 -22- -28- 35-50-65 1.30-1.50 4.00-14.00 0.12-0.15 0.0-2.9 0.0-0.5 .28 .28
32-79 -60- -18- 15-23-30 1.20-1.50 4.00-14.00 0.08-0.15 0.0-2.9 0.0-0.5 .28 .28
Data Source Information
Soil Survey Area: Albemarle County, Virginia
Survey Area Data: Version 9, Jan 20, 2010
USDA Natural Resources Web Soil Survey
;iii Conservation Service National Cooperative Soil Survey
Soil Features--Albemarle County,Virginia r✓ °ef Verizon-Hydraulic-Comcast
Soil Features
This table gives estimates of various soil features. The estimates are used in land
use planning that involves engineering considerations.
A restrictive layer is a nearly continuous layer that has one or more physical,
chemical, or thermal properties that significantly impede the movement of water
and air through the soil or that restrict roots or otherwise provide an unfavorable
root environment. Examples are bedrock, cemented layers, dense layers, and
frozen layers.The table indicates the hardness and thickness of the restrictive layer,
both of which significantly affect the ease of excavation. Depth to top is the vertical
distance from the soil surface to the upper boundary of the restrictive layer.
Subsidence is the settlement of organic soils or of saturated mineral soils of very
low density. Subsidence generally results from either desiccation and shrinkage,
or oxidation of organic material,or both,following drainage.Subsidence takes place
gradually, usually over a period of several years. The table shows the expected
initial subsidence,which usually is a result of drainage, and total subsidence,which
results from a combination of factors.
Potential for frost action is the likelihood of upward or lateral expansion of the soil
caused by the formation of segregated ice lenses(frost heave)and the subsequent
collapse of the soil and loss of strength on thawing. Frost action occurs when
moisture moves into the freezing zone of the soil. Temperature, texture, density,
saturated hydraulic conductivity(Ksat), content of organic matter, and depth to the
water table are the most important factors considered in evaluating the potential for
frost action. It is assumed that the soil is not insulated by vegetation or snow and
is not artificially drained. Silty and highly structured, clayey soils that have a high
water table in winter are the most susceptible to frost action. Well drained, very
gravelly, or very sandy soils are the least susceptible. Frost heave and low soil
strength during thawing cause damage to pavements and other rigid structures.
Risk of corrosion pertains to potential soil-induced electrochemical or chemical
action that corrodes or weakens uncoated steel or concrete. The rate of corrosion
of uncoated steel is related to such factors as soil moisture, particle-size
distribution, acidity, and electrical conductivity of the soil. The rate of corrosion of
concrete is based mainly on the sulfate and sodium content, texture, moisture
content, and acidity of the soil. Special site examination and design may be needed
if the combination of factors results in a severe hazard of corrosion. The steel or
concrete in installations that intersect soil boundaries or soil layers is more
susceptible to corrosion than the steel or concrete in installations that are entirely
within one kind of soil or within one soil layer.
For uncoated steel, the risk of corrosion, expressed as low, moderate, or high, is
based on soil drainage class, total acidity, electrical resistivity near field capacity,
and electrical conductivity of the saturation extract.
For concrete, the risk of corrosion also is expressed as low, moderate, or high. It
is based on soil texture, acidity, and amount of sulfates in the saturation extract.
USDA Natural Resources Web Soil Survey 11/19/2013
'ion Conservation Service National Cooperative Soil Survey Page 1 of 2
Soil Features---Albemarle County,Virginia %le
Report—Soil Features
Soil Features—Albemarle County,Virginia
Map symbol and Restrictive Layer Subsidence Potential for frost
soil name action
Kind Depth to Thickness Hardness Initial Total Unco
top
In In In In
65B—Pacolet
sandy loam,2 to 7
percent slopes
Pacolet — — — None High
65C—Pacolet
sandy loam,7 to
15 percent slopes
Pacolet — — — — None High
Data Source Information
Soil Survey Area: Albemarle County, Virginia
Survey Area Data: Version 9, Jan 20, 2010
USDA Natural Resources Web Soil Survey
Conservation Service National Cooperative Soil Survey