This is presentation about impacts of high-voltage power transmission Lines Project. All impact can be face in construction or after construction. EIA report can be apply this impacts.

1. Welcome
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2. Ma Nandar Nwe
Dip.EIA/EMS (2)
Mining Engineering Department,
YTU
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3. Types of Environmental Impacts Found in
Transmission Projects
• Agricultural Lands Impacts
• Forest Impacts (WoodLands)
• Wetland and Riparian Impacts
• Biodiversity Impacts
• Safety and Public Health
• Electromagnetic Fields (EMF)
• Cultural Sites
• Aesthetic Impacts
• Resettlement
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4. Agricultural Lands Impacts
• impacts depend on the transmission line design and the type
of farming
• Increase soil erosion by requiring the removal of
windbreaks that were planted along field edges or between
fields
• Create opportunities for weed and other pest encroachment
• Compact soils and damage drain tiles
• Hinder or prevent aerial spraying or seeding activities by
planes or helicopters
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5. Mitigation of Agricultural Impacts
• Avoid or minimize construction;
• Identify, address, and document concerns before
construction begins;
• Find resolutions for anticipated impacts
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Forest Impacts (Woodland)
• the permanent removal of woody vegetation
• bare land or land covered by completely different
vegetation communities

7. Mitigation of Impacts to Woodlands
Impacts to woodlands can be minimized by a variety of
methods. Example methods include:
• Avoiding routes that fragment major forest blocks;
• Adjusting pole placement and span length to minimize the
need for tree removal and trimming along forest edges;
• Allowing tree and shrub species that reach heights of 12 to
15 feet to grow within the Right of Way(ROW);
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• Heavy machinery can crush wetland vegetation;
• Wetland soils, especially very peaty soils can be easily
compacted, increasing runoff, blocking flows, and greatly
reducing the wetland’s water holding capacity;
• The construction of access roads can change the quantity or
direction of water flow, causing permanent damage to
wetland soils and vegetation;
Wetland and Riparian Impacts

9. Mitigation of Impacts to Wetlands
• Avoid placing transmission lines through wetlands
• Limit construction to winter months when soil and water are
more likely to be frozen and vegetation is dormant;
• Use mats;
• Use alternative construction equipment such as helicopters;
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10. • can affect biodiversity in many ways, including habitat
conversion and fragmentation, pesticide use and
construction roads
• For Example: trees used by birds for nesting might be cut
down or soil erosion may degrade rivers and wetlands that
provide required habitat
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Biodiversity Impacts

11. Mitigation of Impacts to Biodiversity
• Doing preliminary research and field assessments
• the design of the transmission line,
• reducing the workspace at a particular location,
• employing special construction techniques, or limiting
construction activities to specific seasons.
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12. Safety and Public Health
• a risk of electrocution to the public
• by direct contact with high voltage equipment and lines, and
also by induced voltages
• Humans and farm animals can also risk electrocution or
nuisance shock
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13. Occupational Health and Safety Monitoring
• Transmission lines must meet the requirements of the
international standard
• built with a grounded shield wire placed along the top of the
poles, above the conductors
• Monitoring should be design and implemented by
professionals
• Maintain a record of accidents and diseases
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Electric and Magnetic Fields (EMF)
• The effects (EMF) on humans are scientifically uncertain at
this point
• health effects, including childhood leukemia and
miscarriage, others
• But there is no data demonstrating adverse health effects

15. Reducing Magnetic Field from Transmission
Lines
• to bring the lines (conductors) closer together
• Use of underground cable, especially in populated areas.
• Identification of potential exposure levels in the workplace
• Establishment and identification of safety zone
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16. • can affect cultural sites such as areas of archaeological,
historical, or religious significance
• Burial sites and buried artifacts may be disturbed
• can damage sites by digging, using heavy equipment,
uprooting trees, by making the sites more accessible to
vandal
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Cultural Sites

17. Mitigation of Cultural Impacts
• If during construction an archeological site is encountered,
construction at the site is stopped
• makes recommendations from related organizations on how
construction should proceed
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Aesthetic Impacts
Aesthetic impacts depend on:
• The physical relationship of the viewer and the transmission line (distance
and sight line);
• The activity of the viewer (e.g., living in the area, driving through);
A transmission line can affect aesthetics by:
• Removing a resource, such as clearing fencerows;
• Degrading the surrounding environment (e.g., intruding on the view of a
landscape);
• Changing the context of the view shed (e.g., evoking an image of
development in a previously rural area).

19. Mitigation of Aesthetic Impacts
• to avoid areas considered scenic
• The form, color, or texture of a line can be modified to
somewhat minimize aesthetic impacts
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20. Resettlement
• removal of people living in project locations
• socially and economically disruptive to the
people affected
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21. Resettlement Plans and Compensation Plan
• must adhere strictly to due process of the relevant laws in
each country, as well as to international guidelines
• Other economic losses :for example, lost agricultural
production, lost of land or farm
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23. The Role of the Public Service
Commission
An applicant must receive a Certificate of Pubic Convenience
and Necessity (CPCN) from the Commission for transmission
line projects that are either:
• 345 kV or greater; or,
• Less than 345 kV but greater than or equal to 100 kV, over
one mile in length,
review process includes a public hearing in the affected
project area.
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24. ADB Environmental Assessment Requirements
for Transmission Projects
• Category A: An environmental impact assessment (EIA) is
required
• Category B: An initial environmental examination (IEE) is
required
• Category C:. No EIA or IEE is required, although
environmental implications are still reviewed
In general, power transmission projects are assigned to
Category B.
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27. Conclusion
• described the main types of environmental impact
encountered in electricity transmission projects;
• Can prevent necessary case in construction time and future;
• Can get many help from international organization;
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28. References
• International Best Practices for Assessing and Reducing the
• Environmental Impacts of High-Voltage Transmission Lines
• http://www.powerconsumer.com/2015/05/understanding-
the-power-system/
• Environmental, Health, and Safety Guidelines for Electric
Power Transmission and Distribution
• IFC Performance Standards on Environmental and Social
Sustainability
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29. Thank You!
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