American Transmission Company
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Appendix K Exhibit 1 PSC REF#:191894 Public Service Commission of Wisconsin RECEIVED: 10/15/13, 1:25:27 PM September 24, 2013 AMERICAN TRANSMISSION COMPANY Badger Coulee 345 kV Transmission Line Project Communication Facility Impact Study Phase 1 Technical Report Revision 0 PROJECT NUMBER: 130308 PROJECT CONTACT: KURT BELL. P.E. EMAIL: [email protected] PHONE: (208) 288-6343 Page 1 of 24 Appendix K Exhibit 1 COMMUNICATION FACILITY IMPACT STUDY PHASE 1 PREPARED FOR: AMERICAN TRANSMISSION COMPANY PREPARED BY: TYLER KENT - (315) 295-7407 - [email protected] KURT BELL, P.E. - (208) 288-6343 - [email protected] JOHN SQUIRE, P.E. - (503) 892-6764 - [email protected] REVISION HISTORY ISSUE ISSUED PREP CHKD APPD REV. NOTES DATE FOR BY BY BY 0 09/24/13 IMPL GKB TRK JFS Issued for client implementation “Issued For” Definitions: - “Prelim” means this document is issued for preliminary review, not for implementation - “Appvl” means this document is issued for review and approval, not for implementation - “Impl” means this document is issued for implementation - “Record” means this document is issued after project completion for project file BOI 029-1640 (SR-06) ATC (09/24/13) KB 130308 REV.0 Page 2 of 24 Appendix K Exhibit 1 TABLE OF CONTENTS 1.0 Executive Summary .......................................................................................................... 1 2.0 Project Background ........................................................................................................... 2 3.0 Data ................................................................................................................................... 4 3.1 Badger-Coulee 345 kV Transmission Line Details ......................................................... 4 4.0 Analysis Results ................................................................................................................ 5 4.1 AM, FM, And TV Broadcast Facilities ........................................................................... 5 4.1.1 AM Facilities ............................................................................................................ 6 4.1.2 FM Facilities ............................................................................................................. 7 4.1.3 TV Facilities ............................................................................................................. 8 4.2 Additional Communication Facilities ............................................................................. 9 5.0 Conclusion ....................................................................................................................... 17 Appendix A – Transmission Line Routes ............................................................................. A-1 LIST OF TABLES Table 1: AM Broadcast Facilities Located Within 10 km ...................................................................... 7 Table 2: FM Broadcast Facilities Located Within 10 km ...................................................................... 7 Table 3: TV Broadcast Facilities Located Within 10 km ....................................................................... 8 Table 4: Additional Communication Antennas Located Within 10 km ............................................... 10 TABLE OF FIGURES Figure 1: Frequency Spectra of Corona and Gap Discharge Current Pulses .......................................... 5 Figure 2: Proposed Routes Briggs Road - North Madison Transmission Line ................................. A-2 Figure 3: Proposed Routes North Madison – Cardinal Transmission Line ........................................ A-3 BOI 029-1640 (SR-06) ATC (09/24/13) KB 130308 REV. 0 i Page 3 of 24 Appendix K Exhibit 1 1.0 EXECUTIVE SUMMARY This Phase 1 communication facilities impact study is for American Transmission Company’s (ATC) Badger Coulee 345 kV Transmission Line Project (BCTLP). This project is a new single circuit 345 kV transmission line that will connect the Xcel Energy Briggs Road Substation as part of the CapX2020 project (to be constructed in the town of Onalaska) to the existing North Madison Substation and ultimately terminating at the existing Cardinal Substation. POWER Engineers, Inc.’s (POWER) engineering service for this study was to identify existing communication facilities in the vicinity of the two possible line routes (identified as the Northern and Southern Routes) that may be impacted by the new 345 kV transmission line. The purpose of the Phase 1 investigation is to validate whether a viable risk is present and is not meant to present detailed engineering or address mitigation techniques. Communication sites with possible risks are identified that will be analyzed in the Phase 2 investigation. The conclusions from the Phase 1 assessment indicate that there are communication facilities in close proximity to the BCTLP which could be impacted by the new 345 kV transmission line. The identification of the sites and additional Phase 2 analysis required is as follows: 1. Audible Noise, Radio Interference, and Television Interference: a. At the time of this assessment, calculations predicting the audible noise (AN), Radio Interference (RI), and television interference (TVI) associated with the operation of the Badger Coulee 345 kV transmission line had not been performed. It is recommended that these predictive calculations are made for the selected routes for use in comparison to established standards and regulations. b. It is recommended that pre-energization audible noise measurements are conducted at even intervals along the route to be used for validation of predicted measurements. c. It is recommended that pre-energization pattern measurements for all AM radio and television broadcast facilities within 10 kilometers (approximately 6.2 miles) of the proposed line are conducted at even intervals along the route. This will determine broadcast signal strengths which will then be used for computing signal-to-noise ratios to assess interference from the 345 kV transmission line. 2. AM Reradiation: a. Nine (9) AM Radio antennas were found to be within 10 km of the proposed routes. It is recommended that all nine antennas are analyzed in Phase 2 using the methodologies in IEEE standard 1260-1996 to predict the possibility of AM broadcast reradiation. 3. Microwave Communication Line-of-Sight Interference: a. At the time of assessment, determination for additional analysis was based upon the visual inspection of the azimuth of the licensed microwave systems and the possibility of the communication path crossing the line. Therefore, details associated with the identified paths will be required in the Phase 2 analysis. BOI 029-1640 (SR-06) ATC (09/24/13) KB 130308 REV. 0 1 Page 4 of 24 Appendix K Exhibit 1 4. Grounding Analysis: a. Initial investigation identified four (4) licensed communication facilities within approximately 500 feet (established from previous studies threshold, in the State of Wisconsin) of the transmission line, as the facilities that may experience transferred voltages on their associated communication grounding systems. If during Phase 2 analysis the soil composition requires the 500 feet threshold be extended, additional assessment of the antennas may be required to verify adequacy of this recommendation. This requires additional Phase 2 analysis to analyze the soil composition in the area for the purpose of identifying the specific separation distance required at each of the sites. The additional investigation will require: i. At least one soil measurement traverse to extend a distance equal to the separation distance of the transmission line and each of the four (4) licensed facilities in question at a distance no greater than 500 feet from the proposed line. 5. Additional Sites: a. The following sites have been identified as requiring additional Phase 2 analysis to determine the impacts of their facilities once a route has been identified and approved. i. All WisDOT locations along the highways and interstates associated with the final selected route. 1. Additional requests for information will be required once a route has been selected to determine all facilities located near the line. ii. GPS Satellite low power signals to NOAA state survey monuments near the proposed line’s center line. 1. Additional requests for information will be required once a route has been selected to determine all facilities located near the line. iii. A single Cell Tower (Van Etten Property) located East of Interstate 39 on the northern route. 1. Information pertaining to this facility was gathered during the field survey to be used during Phase 2 analysis. iv. Ham Radio operator (Neven Property) north of the town of Lodi, approximately 1,800 feet from the proposed line location. 1. Information pertaining to this facility was gathered during the field survey to be used during Phase 2 analysis. 2.0 PROJECT BACKGROUND The transmission line investigated in this study is ATC’s Badger Coulee 345 kV transmission line, which is to be constructed between the Briggs Road Substation (Xcel Energy’s new substation that is be located in the town of Onalaska) to the existing North Madison Substation (located in the town of Vienna) and ultimately to the existing Cardinal Substation (located in the town of Middleton). Detailed descriptions of the Northern and Southern routes (with additional information of structures and other circuits) are shown in the Briggs Road - North Madison Transmission Line Design Summary Document and the North