TM 5-803-1
provisions of this plan which could affect long-range
c. The impact of the Army Survival Measures Plan
installation development should be identified.
on the installation also should be evaluated and specific
Section Ill. ON-POST DATA ANALYSIS
-- Susceptibility (o wind or water erosion.
2-12. Overview and sources
-- Areas of muck. peat, or soils with high organic
On-post data analysis consists of comprehensive evaluations
content.
of existing natural and man-made conditions on the
- Unstable or denuded land
installation. This analysis is concerned with all aspects of
(2) The foundation material value of predominant
the installation. but particularly the limitations on the
soil types at the installation should be established.
installation's long- range development must be clearly
(3) Where septic fields or lagoons are used to
established. Information about on-post conditions is
dispose of sewage effluent. the soil limitations for these
available from published reports. contributory plans,
locations should be evaluated. including seepage. high or
special studies. Existing Condition Maps. and on-post
low permeability and shallow depth to water table.
contacts and reconnaissance. The initial contact for on-
(4) Limitations caused by frost penetration of soil
post sources is the Director of Engineering and Housing
layers should be identified.
(DEH) who will provide advice on data sources within
(5) Areas where severity of soil limitations may be
other directorates or offices. Tenant unit missions, oper-
increased by topographic and hydrologic factors should be
ations. and future requirements directly influence Master
Identified. These areas may include steep slopes or
Plan development and should be included in data collection.
floodplains for example:
2-13.
Natural
Environment
c. Topography.
(1) Elevation above sea level and the general
On-post environmental conditions and the natural resource
topographic orientation of the installation should be
base will affect installation development. Such conditions
identified. This analysis should concentrate on features
should be evaluated particularly those natural elements
restricting the use of portions of the installation. Potential
which may create significant limitations for construction of
features include:
buildings, roadways, utility systems, runways, training
-- Steep slopes with grades greater than 15 percent.
ranges. or other facilities. The evaluations should include
Moderate to steep slopes with grades between 10
geology, soils, topography, hydrology, and vegetation and
and 15 percent where there is intense development.
wildlife.
-- Minimal grades (typically one percent or less) with
a. Geologic conditions. The capability of underlying
inadequate drainage and ponding of water.
geological formations to support installation development
Erosion on or any evidence of extensive soil slope
should be identified. Limitations should be established,
failure along with related factors such as lack of vegetation
such as:
or increased runoff contributing to these conditions.
Low compression or bearing strength in areas of
Areas of irregular topography marked by rock
shale, limestone. and other sedimentary rocks requiring
outcropping or moraines creating construction diffculties.
costly construction or engineering techniques.
The location and size of surface depressions.
Bedrock depths of less than 8 feet below the surface
(2) Topographic features which in turn affect
which could affect excavation for foundations and utilities.
climatic conditions should be identified. These effects
Excessive bedrock depths which create unusual
vary substantially with geographic location but may
foundation requirements.
include increases in wind velocities along crests and
Areas of unconsolidated deposits such as sand.
windward slopes in the direction of prevailing winds.
gravel. or other materials which are difficult to compact.
potential fog and frost pockets in valley floors. or areas of
Fault lines. subsidence. or evidence of other geologic
coastal fog or increased humidity in coastal lowland areas.
disturbance or hazards.
(3) The impact of installation landforms on future
b. Soil conditions.
development should be evaluated. Potential impacts are
( 1 ) Limitations of soil types and characteristics for
diverse and will reflect particular conditions of the instal-
excavation building foundations. and roadways or other
lation site. Some factors to be considered include landform
pavement construction may be established based upon
diversity where variations in topography create visual
soil association or classifications. The limitations may
contrasts, such as a river valley between rolling hills:
include:
landforms as spatial determinants. such as steeply rising
Unsuitability for compaction.
mountain slopes and promontories; or other highly visible
Low permeability causing poor drainage and pending
landforms providing points of reference or visual land-
High water table causing prolonged wetness.
marks, such as bedrock outcropping or domes.
Inadequate stability due to lack of shear strength.
potential frost heave, or high shrink-swell potential.
2-9
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