Source: https://www.scribd.com/doc/131213427/Electric-10
Timestamp: 2017-07-22 14:12:51
Document Index: 637426223

Matched Legal Cases: ['§ 1', '§ 182', '§ 32', '§ 182', '§ 182', '§ 182', '§ 196', '§ 93', '§ 281', '§ 23', '§ 30', '§ 182']

Electric 10 | Electric Power Transmission | Invasive Species
Electric 10Uploaded by 159753ADANARelated InterestsElectric Power TransmissionInvasive SpeciesIntroduced SpeciesSoilElectromagnetic InterferenceRating and Stats0.0 (0)Document ActionsDownloadShare or Embed DocumentEmbedView MoreCopyright: Attribution Non-Commercial (BY-NC)List price: $0.00Download as PDF, TXT or read online from ScribdFlag for inappropriate contentEnvironmental Impacts of Transmission LinesIntroduction
This overview reviews the environmental issues and concerns raised by the construction and operation of electric transmission facilities. The first part provides a general summary of the types of analysis and the means to measure and identify environmental impacts. The second part is an alphabetic list of potential impacts and the available methods to minimize or mitigate the impacts. This general information can be found on the following pages. Topic Page Aesthetics ........................................................................................6 Agricultural Lands ..........................................................................7 Airports and Airstrips ................................................................. 12 Archeological and Historical Resources .................................. 12 Cultural Concerns ....................................................................... 12 Electric and Magnetic Fields (EMF) ........................................ 13 Endangered/Threatened and Protected Species .................... 13 Implantable Medical Devices and Pacemakers ....................... 14 Invasive Species ........................................................................... 14 Noise and Light Impacts............................................................ 15 Property Owner Issues ............................................................... 16 Radio and Television Reception ............................................... 17 Recreation Areas ......................................................................... 17 Safety ............................................................................................. 18 Stray Voltage ................................................................................ 19 Water Resources .......................................................................... 21 Wetlands ....................................................................................... 24 Woodlands ................................................................................... 26 In the final section of this pamphlet, community involvement and the role of the Public Service Commission (PSC) is discussed. PSC regulates transmission line construction so that costs to consumers are minimized, Wisconsin has a safe and reliable electric supply, and environmental and social impacts are limited.
Measuring and Identifying Environmental Impacts
Quantifying Potential Impacts
The impact from the construction of a transmission line can be measured in several different ways. Useful measurements of impacts may be area (acreage), distance (miles or feet), or the number of transmission structures. The effect of a new transmission line on an area may depend on the topography, land cover, and existing land uses. In forested areas for example, the entire right-of-way (ROW) width is cleared and maintained free of tall-growing trees for the life of the transmission line. The result is a permanent change to the ROW land cover. In agricultural areas, heavy construction vehicles traverse the ROW and temporarily suspend the use of the land for crop production. After construction ends and the fields are properly restored however, the land beneath the line can be cropped or pastured. For this reason, the area permanently affected by the line is usually much smaller than the area temporarily affected during construction. Where transmission lines are routed through areas that are valued for their scenic qualities, the visual impacts of the line (the area affected) may extend well beyond the ROW.
Determining the Degree of Potential Impacts
In general the degree of impact of a proposed transmission line is determined by the quality or uniqueness of the existing environment along the proposed route. The quality of the existing environment is influenced by several factors:  The degree of disturbance that already exists The significance of prior disturbance can be evaluated by determining how close the place resembles pre-settlement conditions. Many areas have been substantially altered by logging, the installation of drain tiles, residential and commercial developments, or conversion to cropland. The uniqueness of the resources Proposed transmission routes are reviewed for species or community types that are uncommon or in decline in the region or state. The environmental review evaluates whether the resource possesses a feature that would make it unique, such as its size, species diversity, or whether the resource plays a special role in the surrounding landscape. The threat of future disturbance The resource is compared to surrounding land uses which may affect the quality of the resource over time. Whether the current and likely future land uses may threaten some aspect of the resource. Whether the resource is valued by the adjacent community and therefore, likely to be preserved.
Identifying the Duration of Potential Impacts
The construction of a transmission line involves both long-term and temporary impacts. Long-term impacts can exist as long as the line is in place and include land use restrictions and aesthetic impacts. Temporary impacts occur during construction or at infrequent intervals such as during line repair or ROW maintenance. Temporary impacts during construction can include noise and crop damage. Short-term impacts can become long-term impacts if not properly managed or mitigated.
It may be possible to lessen or mitigate potential environmental, landowner, and community impacts by adjusting the proposed route, choosing a different type of pole structure, using different construction methods, or implementing any number of post-construction practices. The PSC can require the transmission construction applicants to incorporate specific mitigation methods into the project design, construction process, and/or maintenance procedures. Examples of common mitigation techniques are shown in the table below. Table 1 Examples of Mitigation Strategies Project Phase Design Phase Feature Transmission Structure Examples of Mitigation Methods Choosing a different transmission pole with different construction requirements and aesthetic appeal.  H-frame structures have longer span widths which make it easier to cross rivers, wetlands, or other resources with fewer impacts (see Figure 1).  The darker color of oxidized steel structures may blend in better with forested backgrounds.  Low profile poles can be used near airports to avoid interference with flight approaches.   Construction Phase Erosion control Constructing when the ground is frozen and vegetation is dormant to minimize impacts to wetland habitat. Delaying construction in agricultural areas until after harvest to minimize crop damage.
Installing and maintaining proper erosion controls during construction to minimize run-off of topsoil and disturbances to natural areas. Annual surveying for new populations of invasive species (e.g. purple loosestrife) caused by construction disturbances. Early detection of invasive species increases the likelihood of successful outcomes.   De-compacting agricultural soils so that impacts to crop yields are minimized (see Figure 2). Re-vegetate ROWs in natural areas with DNR-approved seed mixes.
Post-Construction Invasive Species Phase Management
Post-Construction Restoration Phase
It is the policy of the state (Wis. The more the ROW overlaps an existing ROW. roads or highways. depending on the choice of structures and the size of the line. and (d) new corridors. Stat.12(6)) to site new transmission lines to the greatest extent feasible. Double-Circuit Structure
Figure 1 Typical Two-Pole. (b) highway and railroad corridors. Upgrading an existing transmission line from single-circuit to double-circuit can increase the cost by 130 percent or more. if the new line can be placed in the center of an existing ROW Land use patterns may have already adapted to the existing ROW Electric and magnetic fields (EMF) may be reduced because new structure designs place line conductors closer together resulting in lower EMF
There could also be disadvantages. When properly evaluated as part of routing decisions. The environmental advantages of double-circuiting an existing line are:  
Little or no additional ROW clearing. and community impacts of a new transmission line. (c) recreational trails with limitations. ROW-sharing with some of these types of corridors has more advantages than others. utilizing existing corridors in the following order of priority: (a) existing utility corridors. gas or oil pipelines. corridor sharing can be a useful method in mitigating environmental. so using the existing ROW reduces the efficiency of the new line and increases costs A wider ROW is needed because the size of the new line is much greater than the existing line Figure 2 Typical Single-Pole. the more benefits are 4
. property. and railroad corridors. Transmission line ROWs can be shared in all or part with other electric transmission lines.Replacing or Upgrading Existing Lines
One method to mitigate impacts during project design is replacing or double-circuiting an existing line rather than building a new line. Using an existing transmission line ROW may also not be the best choice when:     The existing ROW is in a poor location New residential areas have been built around the existing line Electricity use has grown more in other areas. § 1.
transmission lines constructed cross-country can interfere with farm operations and produce a negative visual impact.  Along local roads. rather than a new impact.possible. corridor sharing with a railroad may require the installation of underground communication circuits for the railroad. Some examples of these disadvantages are described in Table 2. in some situations corridor sharing has drawbacks. However. resulting in additional impacts to wetlands.
Corridor-sharing with an existing utility may require some modification to the proposed transmission structures resulting in additional costs to the project. An existing line may be double-circuited with a new transmission line and therefore require little or no expansion of the existing ROW. Concentrating linear land uses and reducing the number of new corridors that fragment the landscape. Some types of corridor sharing. are not beneficial in reducing impacts.
Often.  Locating a new transmission line ROW parallel with an existing line on separate structures can increase impacts to agricultural operations. This minimizes any potential benefits of corridor sharing. the most preferred type of corridor sharing is with an existing transmission line. Table 2 Examples of Possible Disadvantages of Corridor Sharing Existing ROW Railroads Examples of Corridor Sharing Drawbacks  Some railroad ROWs have long distances between road crossings and additional access roads would be needed for the construction of a transmission line. gas pipelines often require a transmission line ROW to parallel the pipeline ROW with no or very minimal overlap. For example. The construction of a transmission line ROW that overlaps the road ROW would require the clear cutting of these trees and negatively impact aesthetic views.  For reasons of safety. Creating an incremental. Side by side placement of ROWs with no overlap has fewer benefits than true corridor sharing.  New double-circuited structures may be taller than the existing transmission structure and create increased hazards for bird or airport flyways. However. Sharing a corridor with a gas pipeline may require the installation of cathodic protection to prevent
. like building a high-voltage transmission line over a small distribution line right-of-way.  Pipeline ROWs often run cross-country with little or no visual or agricultural effects. large trees may form a scenic canopy over the road.  Railroad corridors that pass through wetlands are generally berms that are too narrow to support transmission structures. Sharing corridors with existing facilities may minimize impacts by:    Reducing the amount of new ROW required.
if the highway is modified.
It is a common practice in residential areas to place low-voltage distribution lines underground. especially where proposed lines would cross natural landscapes and private properties.pipeline corrosion caused by induced currents. This section is meant to provide general background information and not an allencompassing list applicable to all construction projects. One additional drawback to corridor sharing is that landowners who have agreed to an easement for one facility may be unfairly burdened by the addition of more facilities. Transmission structures located within a highway ROW must be moved at the ratepayers’ expense. The PSC offers a separate brochure with more detailed information about underground transmission lines called “Underground Electric Transmission Lines”.
. The tall steel or wide H-frame structures may seem out of proportion and not compatible with agricultural landscapes or residential neighborhoods. The issues are listed in alphabetical order. While this practice may reduce aesthetic and other impacts. However. and community impacts related to the construction and operation of transmission lines. landowner.
Potential Aesthetic Impacts The overall aesthetic effect of a transmission line is likely to be negative to most people. Additional utility easements may further limit their rights and the use of their property. Landowners who have chosen to bury their electric distribution lines on their property may find transmission lines bordering their property particularly disruptive to scenic views. it may increase others. The property owner would then be responsible for negotiating a new easement contract in order to receive proper compensation from the utility. High-voltage transmission lines differ from lower voltage lines in that significant aboveground facilities are necessary to support the underground cable. Underground transmission lines can be a reasonable alternative:    In urban areas where an overhead line cannot be installed with appropriate clearances When it allows for a significantly shorter route than overhead When aesthetic impacts would be significant
Underground transmission lines can have the following disadvantages:     An increase in the area of environmental disturbance The complete removal of small trees and brush along the transmission ROW Increased construction and repair costs Increased operation and maintenance costs
Types of Impacts Associated with Transmission Lines
The following pages describe many of the usual environmental. placing high-voltage transmission lines underground is less common and can cost two to ten times more than building an overhead line.
Some people however. In the end. state law requires the utility to repair much of the damage that can occur during construction and/or provide monetary compensation (Wis. design.017(7)(c) to 182. Some of these techniques include planting vegetative screens to block views of the line. aesthetics are to great extent based on individual perceptions.. Routes can be chosen that pass through commercial/industrial areas or along land use boundaries. wind breaks. aerial spraying. Aesthetic impacts depend on:    The physical relationship of the viewer and the transmission line (distance and sight line) The activity of the viewer (e. leaving the ROW in a natural state at road crossings. It is in the interest of the applicant and the affected landowners to discuss these measures early in the planning and design process. The PSC offers a separate brochure with more detailed information about landowner rights called “Right-of-Way and Easements for Electric Facility Construction”. evoking an image of development in a previously rural area)
Mitigation of Aesthetic Impacts Electric transmission lines may be routed to avoid areas considered scenic. ROW management can also mitigate visual impacts of transmission lines... Transmission lines can affect field operations.g. or texture of a line can be modified to somewhat minimize aesthetic impacts. and placing or piling brush from the cleared ROW so that it provides wildlife habitat. Structures constructed of wood or of rust brown oxidized steel may blend better with wooded landscapes. Potential impacts depend on the transmission line design and the type of farming. such as clearing fencerows Degrading the surrounding environment (e.
. irrigation. § 182. intruding on the view of a landscape) Changing the context of the view shed (e. For new transmission lines 100 kV or greater and longer than one mile.g. the lines or other utilities may be viewed as part of the infrastructure necessary to sustain our everyday lives and activities. Stronger conductors can minimize line sag and provide a sleeker profile. Siting. living in the area.g. There are some choices available in transmission structure color and/or construction material. color. and future land uses. construction materials. such as whether the line stands out or blends in
A transmission line can affect aesthetics by:    Removing a resource.
Potential Impacts to Agricultural Land Transmission lines can affect farm operations and increase costs for the farm operator. do not notice transmission lines or do not find them objectionable from an aesthetic perspective. The form. and ROW management can mitigate some of the adverse aesthetic effects of a line. To some. Stat. or sightseeing) The contrast between the transmission structures and the surrounding environment.017(7)(h)). driving through.
erosion of topsoils during rain events. and compaction are interrelated impacts commonly associated with transmission construction and can greatly affect future crop yields. and pesticide contamination of soils on organic farms. Issues of biosecurity can be a concern to many farm operators. the spreading of ginseng diseases to plots reserved for future ginseng production. The degree that soils are compacted by heavy construction equipment again depends on the type of soil and its saturation level. Figure 3 Rutting in Agricultural Lands
. This may impact agricultural lands by increasing the mixing of soils. rutting. and compaction of soils. In recent years there has been discussion about the potential for construction projects to spread farm pests and diseases or to otherwise affect the health of farming operations. erosion. Ineffective erosion controls may wash valuable topsoils downhill and impact wetlands and waterways. soybean cyst nematode. Soil mixing. Soils may be mixed during the excavation of pole foundations or during the undergrounding of electrical lines. Agricultural soils that have been improperly protected or mitigated may suffer decreased yields for several years after the construction of the transmission line is completed. Concerns have been raised about Johne’s disease.The placement of transmission structures can cause the following agricultural impacts:        Create problems for turning field machinery and maintaining efficient fieldwork patterns Create opportunities for weed encroachment Compact soils and damage drain tiles Result in safety hazards due to pole and guy wire placement Hinder or prevent aerial activities by planes or helicopters Interfere with moving irrigation equipment Hinder future consolidation of farm fields or subdividing land for residential development
Placement of transmission lines along field edges or between fields where windbreaks have been planted can increase erosion of soils if the windbreaks must be removed. but in some projects may be more than 50 feet deep. Significant rutting can occur when soils become saturated or in areas of sensitive soils (see Figure 3). Excavated parent material or subsoils should not be mixed with topsoils and spread on the surface of the ROW. The excavation depth for transmission structure foundations can vary greatly.
and weed encroachment issues may be minimized. Landowners and utilities may work out solutions that include minor changes to pole heights. less land impacted. and other significant land use concerns. A utility working with landowners can:    Avoid or minimize construction through sensitive farmland.
Problems with the spread of farm pests or diseases and contamination of soils can be reduced by:  Having the farmer avoid spreading manure or pasturing livestock in the transmission line ROW prior to construction. or construction in.) Avoiding access through. Mitigation of Agricultural Impacts The utility should work with agricultural landowners as early in the design process as is appropriate to help identify potential impacts. Minimizing the use of guy wires but where necessary. Find resolutions for anticipated impacts (e. well in advance of construction. keeping the guy wires out of crop and hay lands and placing highly visible shield guards on the guy wires. field lines. The AIS is prepared to help farmers determine appropriate compensation for their losses. Locating new transmission lines along existing transmission line corridors. Trade and Consumer Protection (DATCP) is required to include in an AIS. agricultural impacts can be prevented and/or minimized. construction timing. Minimizing pole heights and installing markers on the shield wires above the conductors in areas where aerial spraying and seeding are common. reconfiguring the irrigation system at the utilities expense.035 specifies what the Wisconsin Department of Agriculture. Easement agreements should include a discussion of anticipated damages and mutually agreed-upon reparation. payments to temporarily suspend farming activities or the installation of a temporary fence). or adjacent to roads so as to minimize field impacts. Orienting the structures with the plowing pattern to make farm equipment less difficult to use. Using transmission structures with longer spans to clear fields. By incorporating these solutions in written agreements. (This is the most cost-effective method to prevent the spread of animal disease. § 32. Using special transmission designs to span existing irrigation systems or if necessary. and document concerns before construction begins.Agricultural Impact Statement An agricultural impact statement (AIS) is required when the builders of a public construction project have the power to condemn property (eminent domain) and will acquire more than five acres of land from any farm operation. 9
. Locating the line along fence lines. The following approaches might be useful:  Using single-pole structures instead of H-frame or other multiple-pole structures so that there is less interference with farm machinery. address. Wis..g. Stat. specific pole locations. Identify.
Problems with pole placement can be mitigated to some extent if the utility works with farmers to determine optimal pole locations. areas that may contain manure.
However. particularly those related to soil management and pesticide use. and crop rotations so that construction methods and timing can be adapted to the timing of crop work. piled. tillage. § 182. mitigation work on rutted soil could compound the damage already present. § 182.017(7)(c) through (h). 
Learning about individual farm field activities. If construction activity occurs during wet conditions and soils are rutted. such as planting. and replaced upon completion of the construction operation. Allowing a short time for the soil to begin drying and then using a bulldozer to smooth and fill in the ruts is a common mitigation approach (see Figure 4). or markers to identify where construction is occurring. Wis. in consultation with the farmer. if improperly timed. Stat. so that field activities and construction do not overlap. Physically removing manure or contaminated soil from equipment in compliance with existing farm disease control efforts. Installing exclusion fencing to keep livestock away from construction activities.
Protection of organic farm certifications requires critical communication with the farmer and a thorough understanding of the farmer’s operations along the ROW. The Atterberg field test should be used to determine when the soil is friable enough to allow rutting to be remediated safely.1 Mitigation of farm impacts includes prevention of mixing topsoils with sub soils and the underlying parent material. repairing the ruts as soon as possible can reduce the potential for impacts.017(7)(c) requires utilities that construct transmission lines that are 100 kV or larger and longer than one mile to ensure that topsoil is stripped. Stat. Putting barriers between equipment and manure or disease-contaminated soil. Figure 4 Smoothing Out Ruts by Backblading with a Dozer
An organic farmer is also protected during ROW maintenance by the requirements in Wis.
. (Roots only grow where the soil tilth allows for adequate levels of soil oxygen. When construction of the line is complete. to aid enforcement of the statute requirements. appropriate equipment should be used to restore the soil tilth. DATCP has recommended that such machinery and tires also be used across agricultural land if it must be worked during wet conditions. grasslands. Avoiding the removal of critical windbreaks and replanting windbreaks with lower growing woody species. such as: removing rock and all construction debris. DATCP has recommended that. Stat. detailed best management practices should be incorporated into the project construction plans and agricultural specialists should be available to consult with the environmental monitors employed to oversee the contractors and ensure that these protections are implemented. USDA Conservation Reserve Program Lands Some properties in Wisconsin are enrolled in USDA National Resource Conservation Service (NRCS) programs established to preserve wetlands. De-compacting soils following construction with appropriate equipment until the degree of soil compaction on the ROW is similar to soils off the ROW. In these situations. and farmland. and waterways to their original condition. Avoiding construction and maintenance activities during times when soils are saturated. Segregating top soils or soil horizons during excavation and construction to minimize soil mixing. terraces. A soil with good tilth has large pore spaces for adequate air infiltration and water movement. the utility is required to implement these mitigation practices. saturated soils. Using existing roads or lanes utilized by the landowner. or damage to drainage systems. and soil erosion can be lessened by:         Identifying site-specific soil characteristics and concerns from the landowner and farm operator before construction begins. or low ground pressure or tracked equipment to minimize compaction. If compaction within the ROW is detected. § 182. restoring all disturbed slopes. Using construction mats. These federal easements may have restrictive land uses not consistent with the construction of a transmission line. soil compaction. Avoiding areas where impacts might occur by altering access routes to the construction sites. and/or sensitive soils. repairing drainage tile lines and fences damaged by construction.) DATCP can provide guidance on the best methods or equipment to be used. This statute includes requirements. and paying for crop damage. low-impact machinery with wide tracks can be used. Problems with potential damage to soil productivity due to soil mixing. Unless landowners waive their rights in an easement agreement. utilities can negotiate with representatives of the NRCS or avoid these properties and find alternative routes for the transmission line. to minimize soil erosion due to wind. soil mixing. the soil in the ROW in fields that were accessed by heavy construction traffic should be checked for compaction with a soil penetrometer and compared to penetrometer readings on soils outside of the ROW.017(7)(c) This statute describes a number of restoration practices that the utility must employ when building a high-voltage transmission line on private property.To minimize soil compaction during construction in low-lying areas. If a route passes through primarily agricultural land.
Wis. rutting.
They are important and increasingly rare tools for learning about the past. The PSC is required to notify the WHS.Airports and Airstrips
Transmission lines are a potential hazard to aircraft during takeoff and landing. The database must be searched for any sites that might be located along any of the proposed transmission routes. Large brightly colored balls or markers may be installed on overhead transmission line conductors to improve their visibility to pilots and lessen the risk of collision. and in areas where tall machinery. 12
. use special low-profile structures. if the construction of a transmission line has the potential for encountering any archeological resource. Utilities can route transmission lines outside of the safety zone. Route changes are seldom necessary. crushing artifacts with heavy equipment. “Property Owner Issues”. Impacts can occur wherever soils will be disturbed. However. These markers are often employed near airports or airstrips. These issues are discussed under the heading. They may also have religious significance. Archeological surveys might be required in these areas. Because the Amish do not use electric service. are frequently operated. A cultural concern can occur when an identifiable group or community has practices or values that may conflict with the presence of a new transmission line. or by making the sites more accessible to vandals. exposing sites to erosion or the elements. there are other cultural factors that occasionally surface during a transmission project review. such as cranes. and tend not to become involved in government processes. The Wisconsin Historical Society (WHS) has the primary responsibility for protecting archeological/historical resources. in or near fields where aerial applications of pesticides or fertilizers occur. a concerted effort was made to avoid impacts on this community. The WHS then makes recommendations on how construction should proceed so that impacts to the resource are managed or minimizing. WHS will then make recommendations for avoiding and minimizing impacts to the sites. If during construction an archeological site is encountered. or where heavy equipment is used. To ensure safety. It is the responsibility of the PSC to ensure that the construction practices follow all WHS recommendations. The results of the surveys are reported to the WHS. An example of a cultural concern that has been addressed in past transmission line cases is the routing of a proposed transmission line through an Amish community. wish to remain non-confrontational. Cultural impacts may also be related to property impacts and general social concerns such as fairness. or place lights or other attention-getting devices on the conductors. Transmission line construction and maintenance can damage sites by digging. the construction at the site is stopped and the WHS and PSC must be notified by the utility. local ordinances and Federal Aviation Administration (FAA) guidelines limit the height of objects in the vicinity of the runways. WHS manages a database that contains the records of all known sites and is updated as new information becomes available. put a portion of the line underground.
Protection of archeological and historic resources is often discussed in terms of “cultural resource” impacts. at pole locations. Judicious transmission pole placement can often be used to span resources and avoid impacts to the sites.
Archeological and historical sites are protected resources. uprooting trees.
Species of special concern have some problems related to their abundance or distribution. Threatened species are likely to become endangered. However. Every day we are exposed to many sources of EMF from vacuum cleaners. double circuit poles are often taller resulting in less of a magnetic field at ground level. These fields occur whenever electricity is used. Mitigation of Impacts to Protected Species If preliminary research and field assessments indicate that rare species or natural communities may be present in the project area. some areas of the state have not been surveyed extensively or recently. If a state-listed species is likely to be in the project area. the utility should conduct DNR-approved surveys prior to construction. “Electric & Magnetic Fields (EMF)”. A 69 kV line can have a higher magnetic field than a 345 kV line. The PSC offers a separate brochure with more detail about electric and magnetic fields called. nor a plausible biological mechanism by which exposure to EMF could cause disease. computers. trees used by rare birds for nesting might be cut down or soil erosion may degrade rivers and wetlands that provide required habitat. Reducing EMF Levels of Transmission Lines Magnetic fields can be measured with a gauss meter. The research to date has uncovered only weak and inconsistent associations between exposures and human health. The magnetic fields produced by electricity do not have the energy necessary to break chemical bonds and cause DNA mutations. A magnetic field is created when electric current flows through any device including the electric wiring in a home.Electric and Magnetic Fields (EMF)
Potential Impacts of EMF Health concerns over exposure to EMF are often raised when a new transmission line is proposed. Magnetic fields quickly dissipate with distance from the transmission line. impacts can usually be
. This causes the fields created by each of the three conductors to interfere with each other and produce a reduced total magnetic field. microwaves. and fluorescent lights. Exposure to electric and magnetic fields caused by transmission lines has been studied since the late 1970s. To date the research has not been able to establish a cause and effect relationship between exposure to magnetic fields and human disease. not line voltage.
Endangered/Threatened and Protected Species
Potential Impacts to Protected Species Endangered species are species whose continued existence is in jeopardy. In addition. although more study is required. The database includes the location and status of these resources. so the NHI database cannot be relied upon as a sole information source for rare species. The DNR Bureau of Endangered Resources (BER) manages the Natural Heritage Inventory (NHI) which lists current and historical occurrences of rare plants. and natural communities. Magnetic fields generated by double-circuit lines are less than those generated by single-circuit lines because the magnetic fields interact and produce a lower total magnetic field. animals. Construction and maintenance of transmission lines might destroy individual plants and animals or might alter their habitat so that it becomes unsuitable for them. For example. A common method to reduce EMF is to bring the lines closer together. The magnitude of the magnetic field is related to current flow.
animals. and the DNR is needed to develop an effective management plan. Patients can shield themselves from EMI with a car. digital cellular phones. predators. are highly tolerant of a wide range of conditions. The results for each unit depended on the make and model of the device. Human actions are the primary means of invasive species introductions.avoided or minimized by redesigning or relocating the transmission line. In some limited cases. anti-theft security systems. have been associated with problems arising from interference caused by EMF.
Implantable Medical Devices and Pacemakers
Potential Impacts to Implantable Medical Devices Implantable medical devices are becoming increasingly common. Over time. EMI can cause inappropriate triggering of a device or inhibit the device from responding appropriately. Moving away from a source is a standard response to the effects of exposure to EMI. invasive species can overwhelm and eliminate native species. transmission line ROWs can be managed to provide habitat for endangered/threatened resources. or the enclosed cab of a truck. The PSC has the authority to order transmission construction applicants to conduct surveys and implement mitigation measures. a building. The majority of non-native species are harmless because they do not reproduce or spread abundantly in their new surroundings. However. Manufacturers’ recommended threshold for modulated magnetic fields is 1 gauss which is 5 to 10 times greater than the magnetic field likely to be produced by a high-voltage transmission line. but only a very small percentage of those are caused by external EMI. car engines. the patient height.
Potential Impacts by Invasive Species Non-native plants. a small percentage of non-native species are able to become quickly established. It has been estimated that up to 20 percent of all firings of ICDs are inappropriate. Research shows a wide range of responses for the threshold at which ICDs and pacemakers responded to an external EMI source. build. Some non-native species have been introduced intentionally such as the Norway maple for landscaping and the ring-necked pheasants for hunting. radiation therapy. Sources of EMI documented by medical personnel include radio-controlled model cars. and are easily dispersed. An example includes osprey nesting platforms built on top of transmission poles. reducing biodiversity and negatively affecting both ecological communities and wildlife habitats. Transmission line construction causes disturbance of ROW soils and vegetation through the movement of people and
. and physical orientation with respect to the electric field. Two such devices. or limiting the time of construction to specific seasons. ROW maintenance staff. and high voltage electrical systems and devices. The diseases. non-native. All pacemaker and ICD patients are informed of potential problems associated with exposure to EMI and must adjust their behavior accordingly. Close cooperation between the transmission provider. This is called electromagnetic interference or EMI. and parasites that kept their populations in check in their native range may not be present in their new locations. special construction techniques. Mitigation of EMI Transmission lines are only one of a number of external EMI sources. and microorganisms found outside of their natural range can become invasive. pacemakers and implantable cardioverter defibrillators (ICDs). slot machines.
and root stocks can contaminate construction equipment and essentially “seed” invasive species wherever the vehicle travels. pole trailers. Initially. then measures should be taken to control the infestation. If new infestations are discovered. cranes or digger derricks. Once introduced. Best Management Practices To control invasive species. whole tree processors.vehicles along the ROW.
. Typical construction vehicles include bucket trucks. pulling machines. Techniques to control exotic/invasive species include the use of pesticides. and cutting or mowing. noise will be generated by the construction equipment and activities. Code ch. Trucks are used to haul away material that can’t be stockpiled or disposed on-site and to bring in necessary construction materials. Invasive species’ infestations can also occur during periodic transmission ROW maintenance activities especially if these activities include mowing and clearing of vegetation. Transmission structures are constructed by first using a standard drill rig to bore a hole to the required depth. hand pulling. Wood brush and logs may be chipped or burned in the ROW. These measures include marking and avoidance of invasives. the ROW is graded. Concrete trucks carry concrete to the boreholes to construct the foundations of the transmission structures. After the construction is completed. and/or chainsaws. biological agents. If water is encountered. pumps will be used to move the water to either adjacent upland areas or to waiting tanker trucks for proper disposal. post-construction activities are required. and laydown areas. or dumpsters. Cranes then erect the towers on the foundations. proper cleaning of equipment. All of these operations produce noise that may impact adjacent landowners. Sensitive areas such as wetlands and high quality forests and prairies should be surveyed for invasive species following restoration of the construction site. Wis.
During Construction During each phase of construction of the transmission line. normal work schedules and local ordinances usually restrict noise producing activities to daytime hours. backhoes. Because construction measures may not be completely effective in controlling the introduction and spread of invasives. Each exotic or invasive species requires its own protocol for control or elimination. However. It also establishes preventive measures to help minimize their spread. The BMP manual identifies many methods that can be used to limit the introduction and spread of invasives species during and post-construction. agricultural soils are decompacted. controlled burning. These activities can contribute to the spread of invasive species. The company should be consulting the DNR to determine the best methods for control of encountered invasive species. Admin. seeds. and proper disposal of woody material removed from the ROW. NR 40 establishes a classification system for invasive species and prohibits activities that result in the spread of invasive species in certain categories. When bedrock is close to the surface or when subsoils primarily consist of large boulders and large cobbles. invasive species will likely spread and impact adjacent properties with the appropriate habitat. Parts of plants. timing construction activities during periods that would minimize their spread. blasting may be required. and the ROW cleaned up. Finally the wire is strung between the towers using large pulleys. access roads. Using the practices consistent with a Best Management Practices (BMP) manual will assist utilities in complying with “reasonable precaution” requirements of Chapter NR 40. vegetation in the ROW is mowed or cut using mowers.
§ 196. While not directly paid to property owners. the Electric Power Research Institute (EPRI) 16
. Additionally. There is often a feeling of unfairness between those that use electricity and those that bear the impacts of the facilities required to support that use. and academic researchers. Property Value Studies The potential change in property values due to the proximity to a new transmission line has been studied since the 1950s by appraisers. some general conclusions among the studies have been made.491 (3g)(a)). These are usually associated with high-voltage transmission lines and are very weather dependent.During Operation Vibration or humming noise can be noticeable and is most often associated with older transmission lines. The other types of sounds that are caused by transmission lines are sizzles. property owners who live near the line. Also. which is a luminous blue discharge of light usually where the wires connect to the insulators. causing some landowners to be burdened by multiple easements.
ROW Easements Property owner issues are often raised by individuals or communities along proposed transmission line routes. In 2003. municipalities. While the data from many of the studies reviewed are often inconclusive. but not on the ROW. These easement payments are negotiated between the landowner and the utility. it quickly dissipates with distance and is easily drowned out by typical background noises. Some landowners do not regard the payments as sufficient to truly compensate for the aesthetic impacts and the loss of full rights to their own land. Finally. might be affected but are not compensated. The amount can be considerable and is proportional to the percentage of the line constructed within a specific political subdivision and the cost of the project. Data from these studies is often inconclusive and has not been able to provide a basis for specific predictions in other locations for other projects. This is especially true if the landowner is not compensated for the “highest and best use” of the affected parcel. compensation is paid to towns. Stat. Ionization in foggy conditions can also cause a corona. crackles. The money paid to landowners for ROW easements is meant to compensate them for having a transmission line cross their property. utility consultants. Though this noise is audible to those very close to the transmission lines. and counties through which a 345 kV or greater transmission line (high-voltage) is constructed via payment of one-time environmental and/or annual impact fees (Wis. They are caused by the ionization of electricity in the moist air near the wires. Two common issues are payers versus users and property owner rights versus public good. residential properties located in close proximity to a substation could be impacted by the noise and light associated with the operation of a new or enlarged substation. These hardships must be balanced against the potential to reduce environmental impacts caused by the development of new transmission corridors. or hissing noises that occur during periods of high humidity. It is usually the result of conductor mounting hardware that has loosened slightly over the years and can be easily identified and repaired by the utility as part of line maintenance. the policy of corridor sharing favors the placement of new transmission lines within or next to existing infrastructure.
trails. adverse effects on price and value appear to be greatest immediately after a new transmission line is built and appear to diminish over time and generations of property owners. If interference occurs because of the transmission line. 1995. and C. Transmission Line and Property Values: State of the Science. In some cases. Electric Transmission Lines and Property Value. The degree of opposition to an upgrade project may affect the size and duration of the sales-price effects. ROW landscaping. S. shielding of visual and aural effects.
Recreation areas include parks. Seagle. appreciation of property does not appear to be affected. J. Wisconsin. and the Upper Peninsula of Michigan). The value of agricultural property is likely to decrease if the power line structures are placed in an area that inhibits farm operations. lot size. and neighborhood characteristics tend to have a much greater effect on sale price than the presence of a power line.S. Transmission lines can affect these areas by:
Goodrich-Mahoney. or other areas where recreational activities occur. square footage of a house. the average decrease appears to be between 4 and 7 percent. the electric utility is required to remedy problems so that reception is restored to its original quality.  The potential reduction in sale price for single-family homes in the U. however. and integration of the ROW into the neighborhood can significantly reduce or eliminate the impact of transmission structures on sales price. Furthermore.2 Their conclusions do not differ substantially from previous analyses. lakes. Homes not directly adjacent to the ROW or beyond 200 feet from the ROW. 4 Hamilton. November 2003. H. Higher-end properties are more likely to experience a reduction in selling price than lower-end properties. “Impact of Power Transmission Lines on Property Values: A Case Study. Amenities such as proximity to schools or jobs. Schwann. EPRI reported a potential overall decrease of 0 to 6. Adverse effects on the sale price of smaller properties could be greater than effects on the sale price of larger properties.3 percent. Kung. may range from 0 to 14 percent. and G. EPRI. Land Economics 71(4):436-444. For states within the Midwest (Minnesota.
. Although. were affected to a much lesser degree than those abutting the line or ROW. interference is possible at a location close to the ROW due to weak broadcast signals or poor receiving equipment. July 1992.” Appraisal Journal.conducted an assessment of the researched relationship between electric transmission facilities and property values.3 4 Setback distance. Effects on sale price are most often observed for property crossed by or immediately adjacent to a power line. but effects have also been observed for properties farther away from a line.
Transmission lines do not usually interfere with normal television and radio reception. proximity to a transmission line can sometimes result in increased selling time.
5 Wisconsin adopts the most recent edition of the National Electrical Safety Code with certain changes. hikers). PSC 114. Fallen Lines Transmission lines are designed to automatically trip out-of-service (become de-energized) if they fall or contact trees. Altering the types of wildlife found in an area by creating more edge habitat or additional mortality risks to birds.
. even if direct physical contact is not made. because electricity can arc across an air gap. and sets minimum distances between wires.5 The code establishes design and operating standards. It is administered primarily by the Commission. or hunt. there is less risk of contact with higher voltage lines as opposed to low-voltage lines due to the height of the conductors. using pole designs that blend into the background and reduce aesthetic impacts. Individuals with specific concerns about whether it is safe to operate vehicles or farm equipment near transmission lines should contact their electric provider. building other structures within a transmission line ROW is strongly discouraged. Discouraging potential users of recreational areas whose activities depend on the aesthetics of natural surroundings (e.g.234A4 prohibits the construction of high voltage electric transmission lines over occupied residential dwellings or residential dwellings intended to be occupied.. transmission lines are not likely to fall unless hit by a tornado or a vehicle.    
Limiting the location of buildings. Contact with Transmission Lines The most significant risk of injury from any power line is the danger of electrical contact between an object on the ground and an energized conductor. While the code represents the minimum standards for safety. and additions. canoers. As a general precaution. hike. or designing recreation facilities to take advantage of cleared ROW. ski. Providing paths or better access to previously inaccessible areas for those who snowmobile. the ground. Wis. Although they may not be prohibited by code. electrical contact can occur. Code Ch. Generally. However. poles. no one should be on an object or in contact with an object that is taller than 15 to 17 feet while under a high-voltage electric line. This is not necessarily true of distribution lines. the electric utility industry’s construction standards are generally more stringent than the Wisconsin State Electrical Code requirements. Posing potential safety risks by locating new poles or wires in the path of recreational vehicles such as snowmobiles and ATVs without adequate markings.
Safety Standards Transmission lines must meet the requirements of the Wisconsin State Electrical Code.
Some of these effects can be mitigated by locating lines along property edges. and buildings. deletions. When working near transmission lines. backpackers. Admin. Code § PSC 114. bike. Volume 1 of the Wisconsin Electrical Code is found in Wis.
the shield wire is bonded to ground at each transmission structure. More information about working safely under and near transmission lines can be obtained from a brochures available online from the Bonneville Power Administration. are grounded to the earth to ensure safety and reliability. Electric fences with proper grounding should continue functioning properly even when subject to induced voltage.org/pubs. as required by the National Electrical Safety Code and the National Electrical Code. a current will flow through the animal and it is considered stray voltage. Shorter objects under or very near a line may actually receive some protection from lightning strikes. The PSC has opened investigations.bpa. Over the decades. Metal fences can be connected to a simple ground rod with an insulated lead and wire clamp. electric utilities. above the conductors. The magnitude and the strength of the charge will be related to the mass of the ungrounded metal object and its orientation to the transmission line. including farm systems and utility distribution systems. like trees or other tall objects are more likely to intercept lightning strikes.
Causes of Stray Voltage Stray voltage and its impacts on livestock and other confined animals have been studied in detail by state and federal agencies. Typically. This voltage is called neutral-to-earth voltage (NEV).pdf) and from the Midwest Rural Energy Council. At low voltages.htm). Cow Trainers and Crowd Gates” (http://www. Low levels of AC voltage on the grounded conductors of a farm wiring system are a normal and unavoidable consequence of operating electrical farm equipment. Electrical systems. At higher levels. This protects the transmission line from lightning. established measurement protocols. avoidance or other negative behaviors may result. an animal may flinch with no other noticeable effect.html).gov/corporate/pubs/public_service/livingandworking. encouraged the upgrade of rural distribution systems. “Installation and Operation of Electric Fences. a dairy cow may feel a small electric
.wi. Stray voltage may not be noticeable to humans.Lightning New transmission lines are built with a grounded shield wire placed along the top of the poles. significant resources have been allocated to understand this issue. and compiled a stray voltage database to track investigations. but do not attract lightening.mrec. When NEV is measured between two objects that are simultaneously contacted by an animal. universities. Grounding chains can be installed on tractors. and numerous scientists since the late 1970s. some current flows through the earth at each point where the electrical system is grounded and a small voltage develops. The shock is similar to that received by touching a television after walking across a carpet. all in order to develop successful strategies for minimizing stray voltage in farm operations (http://psc. Transmission poles. For example. Because of this. Induced Voltage People or animals can receive a shock by touching a metal object located near a transmission line. Animals may then receive a mild electrical shock that can cause a behavioral response. “Living and Working Safely around High-Voltage Power Lines” (www. In other words some levels of stray voltage will always be found on a farm. Induced current can be prevented or corrected by grounding metal objects near the transmission line.gov/utilityinfo/electric/strayvoltage. Lightning is not more likely to strike houses or cars near the transmission line.
utilities sometimes propose to relocate these paralleling distribution lines further away from the transmission line and/or burying the distribution line underground. This configuration can contribute to stray voltage issues. such as additional grounding or the installation of an equipotential plane. Mitigation of Stray Voltage When stray voltage is a concern. These testing protocols have been developed to collect a reasonable set of data useful in the analysis of the quantity and quality of stray voltage that may be present under a variety of conditions. milk production. these same symptoms can be caused by other factors that are unrelated to stray voltage such as increased mastitis or milk-withholding problems for farms with milking parlors or in barns with milk pipelines. new lines are often colocated near a distribution ROW or the distribution line is underbuilt on the new transmission poles. In 1996. the farm should be tested. Some of these symptoms are interrelated. Stray voltage can be caused by a combination of on-farm and off-farm causes. the utility must take corrective action to reduce its contribution to below the one milliamp level. Mitigation of stray voltage can be achieved through a variety of proven and acceptable methods.
. and the source (including on-farm versus off-farm sources) of such stray voltage. The PSC and DATCP consider that at this level of current. the PSC established a stray voltage “level of concern” of 2 milliamps (PSC docket 05-EI115). One off-farm contributor to stray voltage is the operation of transmission lines in close proximity and parallel to a distribution line. If a utility distribution system contributes one milliamp or more to stray voltage on a farm. and health. and well below where a cow’s behavior or milk production would be affected. some form of mitigative action should be taken on the farmer’s behalf. For example. Potential Impacts of Stray Voltage Herd problems can be difficult to diagnose. increased defecation or urination during milking. health. the farmer may want to consider taking corrective measures to reduce the level below one milliamp. The level of concern is further defined with respect to how it should be reduced. hesitation in approaching waterers or feeders. diet. If the farm electrical system contributes more than one milliamp. A common on-farm source of stray voltage is the inappropriate interconnection of equipment grounding conductors with the neutral conductors of the farm wiring system. To minimize the likelihood of stray voltage occurrences. electrical measurement in confined livestock areas should be done using the established PSC-approved testing procedures with appropriate equipment. The level of concern is not intended as a “damage” level but as a very conservative. Dairy cow behaviors that may indicate the presence of stray voltage include nervousness at milking time. belowthe-injury level. the PSC may require the utility to conduct pre-construction and post-construction testing of potentially impacted farms and lines. a dairy cow that does not drink sufficient water due to shocks may have decreased milk production. increased milking time. or an eagerness to leave the barn. Additionally.and off-farm electrical power systems. below the point where moderate avoidance behavior is likely to occur. As a means to minimize new transmission line impacts. decreased milk production. If stray voltage is suspected to be the cause of herd problems. Field research shows that cow contact current is often dependent on both on. and more specifically. The issue of concern is stray voltage that occurs at a level that negatively affects an animal’s behavior. However.shock when it makes contact with an energized water trough. There are many factors to consider such as the herd’s environment.
Construction and operation of a transmission line across these resources may have both short-term and long-term effects. Stat. The REPS program is jointly managed by the PSC and DATCP.41 and 196. Admin.27 through 23. or national significance. work to answer regulatory questions. The REPS staff also works with farmers. threatened. and a program assistant to the REPS program. Water quality can be impacted not only by work within a lake or river but also by nearby clearing and construction activities. including any crossings of these waters.29) Trout streams (Wis. For certain protected areas the Army Corps of Engineers and/or the US Fish and Wildlife Service might require additional permits and approvals. DATCP (http://datcp. which if improperly installed may damage banks and cause erosion. Stat. especially when located in a migratory corridor. or lakes may have a visual impact on the users and pose a potential collision hazard for waterfowl and other large birds. rivers. Areas of Special Natural Resource Interest Certain waters of the state that possess significant scientific value are identified as Areas of Special Natural Resource Interest (ASNRI) for their protection (Wis. special concern species or unique ecological communities identified in the natural Heritage Inventory Wild rice waters as identified by the DNR and the Great Lakes Indian Fish and Wildlife Commission Waters in areas identified as special area management plan or special wetland inventory study (Wis. Many of these waters have been designated as special resources that have state. and continue to research electrical issues. conduct on-farm and distribution system investigations that can assist farmers in working with the utility or electrician to resolve a power quality concern. Code ch. §§ 93. regional. NR 1. especially during rain events. Admin. and lakes are abundant throughout Wisconsin. Overhead transmission lines across major rivers.Farm operators may receive additional technical assistance from the Wisconsin Rural Electric Power Services (REPS) program (as defined and authorized by Wis.aspx) provides an ombudsman. ANSRIidentified waters include:       State natural areas (Wis. NR 103.05).15) Waters or portions of waters inhabited by an endangered. Code ch. streams. streams.
Potential Impacts to Surface Waters Surface waters in the form of creeks. Stat.wi. provide a format for dispute resolution. The DNR is responsible for regulating public waters. The REPS staff provides information about stray voltage and power quality issues.gov/Farms/Wisconsin_Farm_Center/Farm_Rewiring/Stray_Voltage/index.857).04)
. their veterinarians and nutritionists to resolve herd health and production problems. Code ch. It can also increase erosion of adjacent soils causing sediment to be deposited into the waterbody. Admin. Construction often requires the building of temporary bridges across small channels. § 281. NR 1. §§ 23. an energy technical advisor. The removal of adjacent vegetation can cause water temperatures to rise and negatively affect aquatic habitats. veterinarian.02(7)) Outstanding resource waters or exceptional resource waters (Wis.
using alternative construction methods such as helicopter construction. and poor watershed management. Impacts to surface waters can be avoided by rerouting the line away from the waterbody. drained wetlands. There are several methods and cable types for constructing a transmission line under a resource. geology. using DNR-approved erosion control methods. State laws protect trout streams from pollution and other harmful effects. After construction. or III.
. The use of properly designed temporary bridge structures avoids the necessity of driving construction equipment through streams (Figure 5).000 stream miles or approximately 8 percent have been designated as ORW and more than 4. Temporary bridges consist of timber mats that can allow heavy construction traffic to cross streams. some impacts can be remediated. over 3. Regulations require that these shall not be lowered in quality without good justification. minimizing impacts. channelization. creeks. and recreation. High voltage lines are rarely constructed underground due to the substantial engineering. stormwater discharges) and natural sources are other common causes of trout habitat deterioration. landscaping to screen the poles from the view of river users. cattle grazing.000 stream/river miles in the state. it does require potentially large construction entrance and exit pits on either side of the resource.e. decreased groundwater flow from irrigation. especially in ASNRI-designated waters include avoiding impacts. adjusting pole placements to span the resource overhead. and operational hurdles that would need to be overcome for it to be a feasible alternative to overhead construction. Of the some 42. §§ 30. i.e. hydrology. There are also concerns about the potential for frac-outs which can release drilling fluids into the waterbody and subsurface environment. 
Waters in ecological significant coastal wetlands along lakes Michigan and Superior as identified in the coastal Wetlands of Wisconsin Federal or state waters designated as wild or scenic rivers (Wis. Mitigation of Impacts to Surface Waters Techniques for minimizing adverse effects of constructing transmission lines in river and stream environments. especially in the headwaters.500 stream miles or approximately 11 percent have been designated as ERW. and other drainage features without damaging the banks or increasing the potential for soil erosion. Constructing a line underground will minimize construction and esthetic impacts to the resource.. Stat.27)
There are approximately 100. High-quality trout streams (Class I) have sufficient natural reproduction to sustain populations of wild trout.000 miles of trout streams in Wisconsin categorized as Class I. These streams are often small and may contain small or slow-growing trout. However. Temporary bridges should be located to avoid unique or sensitive portions of these waterways. or constructing temporary bridge structures across the resource. and maintaining shaded stream cover. at or near carrying capacity. Degradation of trout habitat is caused by siltation from erosion. pools. Lower voltage and distribution lines are commonly directionally bored under the waterway. Methods to minimize impacts include avoiding pole placements adjacent to the resource. II. By assigning these classifications to specific streams. Approximately 40 percent of the trout streams are Class I trout streams. and increased temperatures from both man-made (i. riffles.26 and 30. etc. and/or effective remediation of the impacts. High oxygen demand from organic pollution. boring the line under the resource. high quality waters receive additional protection from point source pollution. costs. spawning beds. Outstanding resource waters (ORW) and exceptional resource waters (ERW) are characterized as being valuable or unique for various features including fisheries.
low-growing native tree and shrub buffers along these streams should be allowed to regrow and/or should be replanted so as to maintain the preconstruction water quality in the streams (Figure 6). Erosion controls must be regularly inspected and maintained throughout the construction phase of a project until exposed soil has been stabilized. during. The vegetation maintains soil moisture levels in stream banks. helps stabilize the banks. especially those that may affect water resources. For areas where construction impacts cannot be avoided. DNR Best Management Practices (BMP) should be employed before. The removal of vegetative buffers from ASNRI-designated stream corridors could raise the temperature of the water temperature. Cool water temperatures are necessary for good trout stream habitat. and encourages a diversity of vegetation and wildlife habitats. whenever possible. Woodlands and shrub/scrub areas along streams are a valuable buffer between adjacent farm fields and corridors of natural habitats.Figure 5 Temporary Bridge Structure Spanning a Waterway
Proper DNR-approved erosion control is necessary for all construction activities. and immediately after construction of the project to reduce the risk of excess siltation into streams.
. Existing vegetative buffers should be left undisturbed or minimally disturbed.
waterfowl and other large water birds. and greatly reducing the wetland’s water holding capacity. and providing habitat for aquatic species and wildlife.
Any of these activities can impair or limit wetland functions. Wetland soils. Disturbed wetland soils are not easily repaired. filtering sediments and pollutants. The construction of access roads can change the quantity or direction of water flow. these species may out-compete high-quality native vegetation. thus removing habitat for species in the forest interior. With few natural controls. increasing runoff. especially very peaty soils can be easily compacted. Transmission lines can be collision obstacles for sandhill cranes. The construction and maintenance of transmission lines can damage wetlands in the following ways:        Heavy machinery can crush wetland vegetation and wetland soils. Clearing forested wetlands can expose the wetland to invasive and shrubby plants. causing permanent damage to wetland soils and vegetation. destroying valuable wildlife habitat. Construction and maintenance equipment that crosses wetlands can stir up sediments. regenerating groundwater.
. endangering fish and other aquatic life. Vehicles and construction equipment can introduce exotic plant species such as purple loosestrife. blocking flows.Figure 6 Restored River Bank Following Construction
Potential Impacts to Wetlands Wetlands occur in many different forms and serve vital functions including storing runoff. Organic soils consist of layers of decomposed plant material that formed very slowly.
When fill material is proposed to be placed in a federal wetland. grasslands. exotic species. Admin. In the event that fill material is proposed to be placed in non-federal wetlands (those without connections with navigable waters). the utility can:        Avoid placing transmission lines through wetlands. These invasive species provide little food and habitat for wildlife. Code chs. and farmland. DNR must determine if the proposed activity is in compliance with applicable state water quality standards (Wis. When a CWA. then DNR may have primary authority under Wis Stat. These federal easements may have restrictive land uses not consistent with the construction of a transmission line. state. Mitigation of Impacts to Wetlands To minimize the potential impacts to wetlands. ch. A secondary effect of disturbance is the opportunistic spread of invasive weedy species such as purple loosestrife.Severe soil disturbances may permanently alter wetland hydrology. a permit is required from the U. Section 404. utilities can negotiate with representatives of the NRCS or avoid these properties and find alternative routes for the transmission line. Use alternative construction equipment such as helicopters or marsh buggies for construction within wetlands. Army Corps of Engineers (USACE) under the Clean Water Act (CWA). If the project would result in impacts to wetlands associated with waters of the state. 30. and federal laws regulate certain activities in wetlands. Section 404 permit is required. In these situations. DNR provides a “water quality certification” to the applicant. Limit construction to winter months when soil and water are more likely to be frozen and vegetation is dormant. Use mats (Figures 7 and 8) and wide-track vehicles to spread the distribution of equipment weight when crossing wetlands during the growing season or when wetlands are not frozen. If the proposal is found to be in compliance with state standards.
USDA Wetland Reserve Program Lands Some properties in Wisconsin are enrolled in USDA National Resource Conservation Service (NRCS) programs established to preserve wetlands. NR 103 and 299). S. Adjust pole placements to span wetlands or limit the number of poles located in wetlands.
. wherever possible. Place markers on the top (shield) wire to make the lines more visible to birds if the collision potential is high. DNR must determine if the activity is in compliance with the Wisconsin Nonfederal Wetlands Water Quality Certification General Permit. Local. Clean construction equipment after working in areas infested by purple loosestrife or other known invasive.
cowbirds. and survival of interior forest species. The continued fragmentation of a forest can cause a permanent reduction in species diversity and suitable habitat. wood chips may be spread on the ROW. Transmission construction impacts can include forest fragmentation and the loss and degradation of wooded habitat. This encroachment can have impacts on the number. Thus. health. have large quantities of understory trees. Fragmentation makes interior forest species more vulnerable to predators. Interior forest species include songbirds. Examples of edge species that can encroach into forest interiors via transmission ROWs include raccoons. the landowner should discuss the disposition of all timber to be cut with the ROW agent at the time of the easement negotiation. Smaller diameter limbs and branches are often chipped or burned. wolves.
. or are in sensitive environments such as a wooded wetland. or chipped directly into a truck and hauled off the ROW. § 182. One mile of 100-foot ROW through a forest results in the loss of approximately 12 acres of trees. piled to allow transport by the landowner to specific locations. Forest Fragmentation A transmission line ROW can fragment a larger forest block into smaller tracts. and box elder trees. crows.Figure 7 Mats Used in a Wet Meadow
Figure 8 Mats Used in a Wooded Wetland
Potential Impacts to Woodlands Wisconsin forests provide recreational opportunities. and timber. Building a transmission line through woodlands requires that all trees and brush be cleared from the ROW. Different machines and techniques are used to remove trees from the transmission ROW depending on whether woodlands consist of mature trees. These activities are shown in Figures 9 and 10. These can range from large whole tree processors which can cause rutting and compaction of the forest floor to hand clearing with chainsaws in more sensitive environments. This loss of forested habitat increases the number of common (edge) plants and animals that can encroach into what were the forest interiors. Stat. deer. competition from edge species. wildlife and plant habitats. According to the landowner’s wishes. and/or the loss of income. parasites. many of which are rare. Wisconsin statutes (Wis. and hemlock trees.017(7)(e))state that all timber removed for construction of a high-voltage transmission line remains the property of the landowner. aesthetic enjoyment of the resource. and catastrophic events.
Invasive species. The cause of the disease is a fungus which is carried by sap-feeding beetles or spread through common root systems. Following the DNR guidelines for preventing the spread of exotic invasive plant species and diseases such as oak wilt. honeysuckle. Examples of problematic invasive species are buckthorn. Adjusting pole placement and span length to minimize the need for tree removal and trimming along forest edges. when the fungus most commonly reproduces. pruning or removal of oaks should be avoided during late spring and early summer. Allowing tree and shrub species that reach heights of 12 to 15 feet to grow within the ROW. In the upper Midwest.Figure 9 Whole Tree Processor Clearing a Pine Plantation
Figure 10 Hand Clearing Along a Flood Channel
Invasive Plants Construction vehicles may inadvertently bring into forest interiors invasive and/or non-native plant species. hiking. black oak. Mitigation of Impacts to Woodlands Impacts to woodlands can be minimized by:     Avoiding routes that fragment major forest blocks. and Northern pin oak trees are especially susceptible and will often die within one year. It can also provide recreation opportunities such as access for hunting. Their spread can alter the ecology of a forest as they out-compete native species for sunlight and nutrients. once introduced.
. The opening of the forest floor to sunlight through tree clearing of the ROW can further encourage these aggressive. Red oak. and snowmobiling. further reducing suitable habitat and food sources for local wildlife. Disease A specific but common risk to Wisconsin forests is the potential for oak wilt disease. Other Impacts A cleared ROW increases access into a forest which may lead to trespassing and vandalism. Disturbance in the ROW during transmission line construction or maintenance can contribute to its spread. invasive species to proliferate. have few local natural controls on their reproduction and easily spread. and garlic mustard.
or. towns. as well as the need. over one mile in length. natural resources. or counties include transmission lines in their plans. they may now be rerouted to share corridors with roads. towns. safety. for those cases in which hearings are held. members of the public are encouraged to testify to their views and concerns about the project. roads. The PSC staff analyzes transmission line applications to see if the transmission lines are needed and to determine their potential impacts.
The CPCN review process includes a public hearing in the affected project area. crops. where possible. and to reduce or even avoid. To meet future growth. As these older lines require improvements.Community Planning
In prior decades. potential for individual hardships. The size and complexity of the proposed project determines the PSC review process. engineering. At the same time. but few cities. 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. New and upgraded electric facilities will impact many communities and many property owners. electric transmission lines were constructed from point A to point B in the most direct manner possible without too much regard for communities.
The PSC of Wisconsin regulates Wisconsin’s utilities. The PSC considers alternative sources of supply and alternative locations or routes. communities often draft plans for sewers. how it is to be designed. The CA review process does not automatically include a public hearing. The Commission decides whether the line will be built. and needing some new ROW. and environmental factors when reviewing a transmission project. and development districts. A three-member board (the Commission) is appointed by the governor to make decisions for the agency provided with analysis by a technical staff with a wide range of specialties. economics. Cities. Less than 345 kV but greater than or equal to 100 kV. The Commission is responsible for making the final decisions about proposed transmission lines. community and natural resource impacts. reliability. Transmission lines are costly to build and difficult to site. a continued growth in energy usage will require new electric substations and transmission lines to be sited and constructed. and where it will be 28
. However. or private property issues. and counties can help reduce land use conflicts by:    dedicating a strip of land along existing transmission corridors for potential future ROW expansions identifying future potential transmission corridors and substation sites in new developments defining set-backs or lot sizes for properties adjacent to transmission lines so that buildings don’t constrain future use of the ROW
Being an active participant in the decision-making process will improve the ability of communities to manage future growth and protect their resources. Projects less than 100 kV and/or less than one mile long must receive from the Commission a Certificate of Authority (CA) if the project’s cost is above a certain percent of the utility’s annual revenue.
The three Commissioners meet regularly in “open meetings” to decide cases before them. DNR staff. the Commission approves. or modifies the proposed project. denies. full parties. The Commission has the authority to order additional environmental protections or mitigation measures. the Commission reviews all hearing testimony from PSC staff. and members of the public.located. If there is a hearing. the applicant. At these open meetings.
. The public can observe any open meeting.
Public Service Commission of Wisconsin P.100 Wisconsin public utilities that provide natural gas. steam. heat.gov
Electric10 (06/11)
.The Public Service Commission of Wisconsin is an independent state agency that oversees more than 1.wi.O. Box 7854 Madison. WI 53707-7854 Telephone: 608-266-5481 Toll free: 888-816-3831 Consumer affairs: 608-266-2001 / 800-225-7729 TTY: 608-267-1479 / 800-251-8345 Fax: 608-266-3957 Website: psc. electricity. water and telecommunication services.
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