POST-CONSTRUCTION ELECTRIC & MAGNETIC FIELD MONITORING PLAN GREATER SPRINGFIELD RELIABILITY PROJECT AND THE MANCHESTER TO MEEKVILLE JUNCTION PROJECT
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5 POST-CONSTRUCTION ELECTRIC & MAGNETIC FIELD MONITORING PLAN GREATER SPRINGFIELD RELIABILITY PROJECT AND THE MANCHESTER TO MEEKVILLE JUNCTION PROJECT I. Introduction and Purpose In accordance with the March 16, 2010 Decision and Order of the Connecticut Siting Council (the Council ) in Docket 370A, the July 20, 2010 Decision and Order of the Council in Docket 370A-MR, and the Council s subsequent D&M Plan approvals in each Docket, The Connecticut Light and Power Company (the Company ) proposes the following post-construction electric and magnetic field monitoring plan for the Greater Springfield Reliability Project and the Manchester to Meekville Junction Project (collectively the Projects ). A primary purpose for electric and magnetic field ( E & MF ) measurements near to transmission lines is to make comparisons to levels predicted by calculations. This purpose is best served by selecting post-construction measurement locations where terrain is relatively flat, conductor configurations and heights are typical and representative, and where few if any confounding field sources and objects exist. A secondary purpose for such measurements can be to make comparisons between levels measured at points of interest before and after new line construction. However, those points of interest may not be at locations which best serve the primary purpose. Also, measurements of magnetic fields should not be so compared because grid and power-flow circumstances can be significantly different at the times of these before and after measurements. II. Monitoring Locations The Company s proposed monitoring locations for electric and magnetic fields are listed in Table 1 at the end of this plan. The selected monitoring locations capture each newly constructed overhead line type that is part of the line design, in each town where that type occurs. Additional considerations in location selection are as follows: 1. Lines At a minimum, the Company chose at least one readily accessible monitoring location within each distinctly different right-of-way cross section along the line routes. Cross sections illustrate changes in the type of line construction. At each of the monitoring locations listed in Table 1, measurements will be made within the Company s right-of-way ( ROW ) or on public roadways, and not on nearby private property outside of the Company s ROW absent landowner approval.
6 For a ROW cross section continuing through more than one municipality, the Company chose at least one readily accessible monitoring location for that cross section within each municipality. 2. Substations The Company will take measurements along one continuous path outside the perimeter fence of the North Bloomfield Substation. 3. Measurement Location Characteristics To the extent possible, the Company chose line measurement locations where: (1) the terrain is relatively flat and bare of vegetation; (2) conductor configurations and heights are typical and representative; and (3) few if any confounding sources, such as local distribution lines, and objects exist. III. Measurements for Line Segments The Company will take a post-construction measurement of electric and magnetic fields twice at each of the listed locations within 10 months of commencement of 345-kV line operation For the locations selected to meet criteria II.1, the Company will measure electric magnetic fields along a transect (i.e., profile) passing perpendicularly beneath new sections of overhead 345- and 115-kV lines, at the listed locations. The measurement path will extend to each ROW boundary where reasonable access exists, else to at least 50 feet beyond the outermost line conductors. IV. Measurement Instrumentation and Recording The Company will record all electric and magnetic field measurements at a height of one meter (3.28 feet) above ground in accordance with the industry standard protocol for taking measurements near power lines (IEEE Std [R2008], IEEE Standard Procedures for Measurement of Power Frequency Electric and Magnetic Fields From AC Power Lines ). The resultant magnetic field will be measured with a 3-axis, recording digital meter (EMDEX II). Electric fields will be measured with an E-Probe attachment accessory to the EMDEX II meter. This accessory enables the EMDEX II to make single-axis measurements of the electric field. Both the EMDEX II magnetic field meter and the E-probe accessory meet the IEEE instrumentation standard for obtaining valid and accurate field measurements at power line frequencies (IEEE Std , IEEE Recommended Practice for Instrumentation: Specifications for Magnetic Flux Density and Electric Field Strength 10 Hz to 3 khz. ) With this instrumentation, magnetic fields can be recorded continuously while walking and then plotted, whereas electric fields can be measured at spots and then recorded by hand in a data table and then plotted. 2
7 V. Reporting Within twelve months of the in-service date of the 345-kV line, the Company will provide to the Council a report on these measurements with true-up comparisons to predicted values. True-ups are electric and magnetic field calculations that are based on site-specific conditions, including the actual conductor heights at a location at the time the measurement is made, current flows on the lines at the time the measurement is made, and the terrain. These calculations are then compared with the measurements taken at the location. True-up comparisons of measurements with calculations will be performed and reported for some locations to demonstrate model accuracy The report will also include aerial photographs on a scale of 1 inch equals 100 feet to mark each measurement location. For each magnetic field measurement, the coincident transmission line currents, as recorded by the CONVEX SCADA system, will be noted and reported. Additionally for each measurement location, the size of transmission line conductor types will be reported. 3
8 TABLE 1 E&MF MONITORING LOCATIONS FOR THE GREATER SPRINGFIELD RELIABILITY PROJECT AND THE MANCHESTER TO MEEKVILLE JUNCTION PROJECT Site Cross Section Municipality Project Portion Location 1 1 Bloomfield GSRP Off of Tunxis Ave, CT Route East Granby GSRP South of Holcomb St 3 2 East Granby GSRP South of Turkey Hills Rd 4 2 Split-Phase East Granby GSRP Beyond the End of Copper Hill Terrace 5 2 Suffield GSRP Field East of Ratley Rd 6 23 Manchester MMP South of Tolland 7 24 Manchester MMP Meekville Jct Location 4
9 Mapsheet 5 South AgawamSwitching Station South AgawamJunction \\Espsrv\data\Data2\Projects\NUS\SNETR_Projects\45063_Springfield_345kV\Environmental\GIS\ARC\ArcMXD\Network\GreaterSpringfield\Analysis\GSRP_EMF_Monitoring_Location_Index_Map.mxd COPYRIGHT 2011 BURNS & McDONNELL ENGINEERING COMPANY, INC. Issued: 10/17/2011 Mapsheet 3 Mapsheet 1 GranbyJunction Mapsheet 2 North BloomfieldSubstation Mapsheet 4 Legend Mapsheet Proposed Transmission Structure Centerline Substation or Junction Miles Source: Bing, ESRI and Burns & McDonnell Engineering. NORTH Greater Springfield Reliability Project EMF Monitoring Locations Index Map
10 \\Espsrv\data\DATA2\Projects\NUS\SNETR_Projects\45063_Springfield_345kV\Environmental\GIS\ARC\ArcMXD\Network\GreaterSpringfield\Analysis\GSRP_EMF_Monitoring_Location_Maps.mxd COPYRIGHT 2011 BURNS & McDONNELL ENGINEERING COMPANY, INC Litchfield Hampden Hartford Tolland Legend Existing Structure - Remain Existing Structure - Remove Existing Structure - Reuse Distribution Pole - New Distribution Pole - To Remain Distribution Pole - To Remove Proposed Structure Substation or Junction! Proposed Transmission Structure Centerline \ Wall 3139 Existing ROW Expanded ROW Watercourse Vernal Pool Wetlands Contours (5 ft) Vegetation Removal Limits Substation Fence NU Owned Property Town Boundary 1001 Line List Number EMF Monitoring Location State Highway Wyoming Hills Rd Tunxis Ave Source: AECOM, Coler & Colantonio, VHB, ESRI and Burns & McDonnell Engineering Feet Wynding Hills Rd Greater Springfield Reliability Project EMF Monitoring Maps October 17, 2011 Sheet 01 of 5
11 Adams Dr Concord Dr \\Espsrv\data\DATA2\Projects\NUS\SNETR_Projects\45063_Springfield_345kV\Environmental\GIS\ARC\ArcMXD\Network\GreaterSpringfield\Analysis\GSRP_EMF_Monitoring_Location_Maps.mxd COPYRIGHT 2011 BURNS & McDONNELL ENGINEERING COMPANY, INC Litchfield Hampden Hartford Tolland Legend Existing Structure - Remain Existing Structure - Remove Existing Structure - Reuse Distribution Pole - New Distribution Pole - To Remain Distribution Pole - To Remove Proposed Structure Substation or Junction! Proposed Transmission Structure Centerline \ Wall Existing ROW Expanded ROW Watercourse Vernal Pool Wetlands Contours (5 ft) Vegetation Removal Limits Substation Fence NU Owned Property Town Boundary 1001 Line List Number EMF Monitoring Location Holcomb St 1043 Source: AECOM, Coler & Colantonio, VHB, ESRI and Burns & McDonnell Engineering Feet Greater Springfield Reliability Project EMF Monitoring Maps October 17, 2011 Sheet 02 of 5
12 Turkey Hills Rd \\Espsrv\data\DATA2\Projects\NUS\SNETR_Projects\45063_Springfield_345kV\Environmental\GIS\ARC\ArcMXD\Network\GreaterSpringfield\Analysis\GSRP_EMF_Monitoring_Location_Maps.mxd COPYRIGHT 2011 BURNS & McDONNELL ENGINEERING COMPANY, INC Litchfield Hampden Hartford Tolland Legend Existing Structure - Remain Existing Structure - Remove Existing Structure - Reuse Distribution Pole - New Distribution Pole - To Remain Distribution Pole - To Remove Proposed Structure Substation or Junction! Proposed Transmission Structure Centerline 3178 \ Wall Existing ROW Expanded ROW Watercourse Vernal Pool Wetlands Contours (5 ft) Vegetation Removal Limits Substation Fence NU Owned Property Town Boundary 1001 Line List Number 1049 EMF Monitoring Location GranbyJunction Granger Cir Source: AECOM, Coler & Colantonio, VHB, ESRI and Burns & McDonnell Engineering Feet Greater Springfield Reliability Project EMF Monitoring Maps October 17, 2011 Sheet 03 of 5
13 Country Club Ln \\Espsrv\data\DATA2\Projects\NUS\SNETR_Projects\45063_Springfield_345kV\Environmental\GIS\ARC\ArcMXD\Network\GreaterSpringfield\Analysis\GSRP_EMF_Monitoring_Location_Maps.mxd COPYRIGHT 2011 BURNS & McDONNELL ENGINEERING COMPANY, INC Litchfield Hampden Hartford Tolland 3193 Legend Existing Structure - Remain Existing Structure - Remove Existing Structure - Reuse Distribution Pole - New Distribution Pole - To Remain Distribution Pole - To Remove Proposed Structure Substation or Junction! Proposed Transmission Structure Centerline Existing ROW NU Owned Property Expanded ROW Town Boundary \ Wall 1001 Line List Number Watercourse EMF Monitoring Location Vernal Pool Wetlands Contours (5 ft) Vegetation Removal Limits Substation Fence Copper Hill Ter Source: AECOM, Coler & Colantonio, VHB, ESRI and Burns & McDonnell Engineering Newgate Rd Feet Copper Hill Rd Woodledge Dr Greater Springfield Reliability Project EMF Monitoring Maps October 17, 2011 Sheet 04 of 5
14 \\Espsrv\data\DATA2\Projects\NUS\SNETR_Projects\45063_Springfield_345kV\Environmental\GIS\ARC\ArcMXD\Network\GreaterSpringfield\Analysis\GSRP_EMF_Monitoring_Location_Maps.mxd COPYRIGHT 2011 BURNS & McDONNELL ENGINEERING COMPANY, INC. Litchfield Ratley Rd Hampden Hartford Tolland Legend Existing Structure - Remain Existing Structure - Remove Existing Structure - Reuse Distribution Pole - New Distribution Pole - To Remain Distribution Pole - To Remove Proposed Structure Substation or Junction! Proposed Transmission Structure Centerline Existing ROW NU Owned Property Expanded ROW Town Boundary \ Wall 1001 Line List Number Watercourse EMF Monitoring Location Vernal Pool Wetlands Contours (5 ft) Vegetation Removal Limits Substation Fence Feet Source: AECOM, Coler & Colantonio, VHB, ESRI and Burns & McDonnell Engineering Greater Springfield Reliability Project EMF Monitoring Maps October 17, 2011 Sheet 05 of 5
15 MeekvilleJunction Mapsheet 1 \\Espsrv\data\Data2\Projects\NUS\SNETR_Projects\56856_MMP\Environmental\Non-Records\Retained\GIS\DataFiles\ArcDocs\MMP_EMF_Monitoring_Location_Index_Map.mxd COPYRIGHT 2011 BURNS & McDONNELL ENGINEERING COMPANY, INC. Issued: 10/17/2011 Legend ManchesterSubstation Mapsheets Proposed Transmission Structure Centerline Substation or Junction Miles Source: Bing, ESRI and Burns & McDonnell Engineering. NORTH Manchester to Meekville Junction Project EMF Monitoring Locations Index Map
16 UNNAMED !( !( A W !( W15-515!(!(!( 10089!( 6277 \\Espsrv\data\Data2\Projects\NUS\SNETR_Projects\56856_MMP\Environmental\Non-Records\Retained\GIS\DataFiles\ArcDocs\MMP_EMF_Monitoring_Location_Maps.mxd COPYRIGHT 2011 BURNS & McDONNELL ENGINEERING COMPANY, INC W W W W W15-517!( W W Hartford Legend!( Proposed Structures New Centerline Existing Centerline ) Distribution Pole - Remain ) Distribution Pole - New ) Distribution Pole - Remove! Distribution Centerline Parcel Expansion Existing Structure - Remain Watercourse Ä Wetlands Vernal Pool NU Owned Property MMP-V Veg Removal Limits EMF Monitoring Location Existing Structure - Remove 1001 Line List Number Existing Structure - Reuse CHAPEL RD !( Feet Source: AECOM, VHB, Coler & Colantonio, ESRI and Burns & McDonnell Engineering. W !( TOLLAND TPKE Manchester to Meekville Junction Project EMF Monitoring Maps October 17, 2011 Sheet 1 of
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