Chapter 8: Major Elements
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Transcript Chapter 8: Major Elements
Chapter 8: Landscape Evaluation
and Land Use
Earth scientists as part of evaluation team provide info on:
site history (previous use)
physical and chemical properties of Earth materials
soil type, stability/engineering properties, and
thickness to bedrock
suitability for waste disposal
bedrock type, stability/engineering properties
contamination
hazard evaluation
water availability, quantity, quality
Environmental Geology Maps
Distribution of geologic, hydrologic, etc. info.
Interpretive Environmental Geology Maps
Suitability of areas for a specific land use
Ideally a series of maps, one for each possible land use
Color code for suitability (yes, maybe, no)
soil maps
suitability for landfill
stable foundations
slope stability
groundwater contamination
earthquake vulnerability, etc.
Environmental
Geology Maps
Map showing the
vulnerability of aquifier
contamination, New
Mexico
Environmental
Geology Maps
Map showing the major
sources of potential
groundwater contamination,
New Mexico
Environmental Geology Maps
Environmental Resource Units (ERUs)
Multidisciplinary approach: studies total
natural environment (geo, hydro, bio)
ERU = areas with similar physical and
biological characteristics
Used to establish patterns of land use and
suitability in multidisciplinary approach
Environmental Geology Maps
Environmental Resource Units (ERUs)
10.4 km2 study site in Morrison Colorado test site
Environmental Resource Units (ERUs)
Mountain-forest
Floodplain forest
Pleistocene grassland
Hogback wood and
grassland
scarp slope
Hogback
dip slope
Environmental Geology Maps
Geographic Information Systems (GIS)
Computer composite maps capable of storing and
displaying geographic distribution of anything
The ability to combine and create maps of the
combinations is a powerful technique
Site Selection
Evaluation of places for various human activities
Can be quite multidisciplinary
Assure that development is both possible and
compatible with local environment
Want to know all that you can before develop
Site Selection
Finally proceed to final site evaluation: specific criteria dep
on intended use, but 2 common approaches:
1) Cost-Benefit Analysis
Assess long-range desirability of a project
Calculate estimates of total benefits in $ and compare
to costs
Best site has lowest C/B
Site Selection
Finally proceed to final site evaluation: specific criteria dep
on intended use, but 2 common approaches:
2) Physiographic Determinism
Apply ecological principles in design
Maximize social benefit while minimizing social
costs
Consider physical, social, & aesthetic data of site
itself do determine proper use and design
Environmental Impact Statements (EIS)
NEPA (1969) required all major federal actions which
possibly affect the quality of the environment be
preceded by an evaluation of the project and its impact
Council of Environmental Quality set forth guidelines
for EISs (revised in 1979) . The major components are:
Summary Statement of purpose and need for the
project
Rigorous comparison of reasonable alternatives
Succinct description of the area to be affected
Environmental Impact Statements (EIS)
Discussion of the environmental consequences of the
proposed project and alternatives which must include:
Direct and indirect effects
Energy requirements and conservation
Resource depletion
Impact on urban quality and cultural/historical
resources
Possible conflicts with state and local land-use plans
Mitigation measures
Environmental Impact Statements (EIS)
Scoping
Initial NEPA EIS process criticized for mountains
of paperwork that could obscure critical issues
1979 revisions introduced concept of scoping:
preliminary identification of major environmental
issues that require more detailed evaluation early in the
process
Environmental Impact Statements (EIS)
Mitigation
Identify actions that will avoid, lessen, or compensate
for anticipated adverse impact
If an action involves a wetland, may either avoid the
wetland area or compensate by enhancing or creating
wetland elsewhere
NEPA requires address of this in EIS, but doesn’t
require implementation of any measures
However, DEIS is reviewed by many agencies and
citizen’s groups that may require action
Environmental Assessments in cases where full EIS
deemed unnecessary
Environmental Impact Statements (EIS)
State Environment Impact Legislation
About half of the states have followed the federal lead,
either following NEPA for state and municipal projects
or enacting their own SEPAs
Environmental Impact Statements (EIS)
Negative Declarations (D’s of non-significant impact)
Filed when an agency determines no significant impact
In lieu of full EIS: much less rigorous and need not
consider alternatives
Many try this first, but may be required to do full
EIS if not grounds for ND
Mitigated Negative Declarations
Filed when decided that initial project would
significant environment impact, but that it can be
modified so as to reduce them to ~ insignificance
Environmental Impact Statements (EIS)
Big projects use teams of investigators with varied
expertise
Good case histories:
Cape Hattaras
San Joaquin Valley
Land Use and Planning
Most land use in USA is agriculture or forest
Only about 3% or area is urban
Conversion of rural non-ag is several thousand
km2/yr
~ half wilderness, parks, recreation, wildlife
~ half urban, transportation, other facilities
Scenic Resources
Land Use Options
Multiple Use
Using the same land for > 1 purpose
ball field doubles as aquifer recharge basin
horse trails in floodplain
wind generators in agricultural fields
Sequential Use
One use follows another
Reclaimed mine used for underground storage,
waste...
Walla Walla landfill ballparks
Gravel pits parking lots
Land Use Planning
Nation, State, or City may decide to enact land-use
legislation for planning
Comprehensive or General Plans
Used as a policy guide for development decisions
over a 10-20 yr period
Sets forth intended basic land uses
Indicates zoning and subdivision regulation
Regulated in separate specific ordinances
Control slopes, floodplain development, soils...
Residential
Commerical
Industrial
Open spaces
Comprehensive or General Plans
Land Management
Follow-up to planning
Possible impacts that need to be monitored
Goals
Natural processes: floods, landslides, erosion...
Impact of human use on chemistry, biology, resources...
Protection of lives and property
Protection of water quality and supply
Protection of wildlife
Ecosystem protection
Recreation and public access
Emergency Planning (regulation of response)
Environmental Law
NEPA (National Environmental Policy Act) 1969, 1977
EPA establishes and enforces air and water quality standards
Federal Water Pollution Act (1956) req. municipal sewage treatment
Clean Air Act (1963) and Air Quality Act (1965) amended in 1970 and
1990: addresses all sorts of air pollution (autos, CFCs, ozone...)
Solid Waste Disposal Act (1965) aimed at municipal dumps
Resource Conservation and Recovery Act (1976)
Toxic Substances and Control Act (1976) req. tests and control
Clean Water Act (1977) addresses wider range of pollution
CERCLA (Comprehensive Env. Resource, Compensation, and Liability
Act) (1980) Superfund
NEPA also set up requirement of EIS or EA (and enforces)
CEQ (Council on Env. Quality) promotes interest and
research in environment and implements