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5 50 POWER ENGINEERS, INC. Zorn to Marion 345-kV Transmission Line Project 1.3 Agency Actions This environmental assessment (EA), prepared by POWER Engineers, Inc. (POWER), in support of LCRA TSC's application to amend its CCN from the PUCT, is intended to provide information on certain environmental and land use factors contained in Section 37.056(c)(4) of the Texas Utilities Code and the PUCT's Substantive Rule 25.101(b)(3)(B). This EA may also be used in support of any other local, state, or federal permitting requirements, if necessary. Where a proposed route for the Project crosses a state-maintained road or highway, LCRA TSC will obtain a permit from the Texas Department of Transportation (TxDOT) if that route is ultimately approved by the PUCT. If any portion of the approved route for the transmission line will require access from a state-maintained road or highway, LCRA TSC will obtain a permit from TxDOT prior to construction. Where a proposed route for the project is parallel to TxDOT roads, LCRA TSC intends to place transmission line structures on adjacent private property and not within the road ROW. LCRA TSC does not propose to place any structures of the transmission line within any highway ROW for reasons including, but not limited to, safety, reliability, and compliance with the Texas Administrative Code, specifically TxDOT's Utility Accommodation Rules. LCRA TSC will coordinate with Guadalupe County engineers regarding crossing of county roads as appropriate. For any portion of the Proposed Project located in the City of New Braunfels, LCRA TSC will obtain necessary permits from the City of New Braunfels prior to construction and will coordinate with the city during the design phase of the project. Because more than one acre will be disturbed during construction of the Proposed Project, a Storm Water Pollution Prevention Plan (SWPPP) will be prepared; and because more than five acres will be disturbed, a Notice of Intent (NOI) will be submitted by LCRA TSC to the Texas Commission on Environmental Quality (TCEQ). The controls specified in the SWPPP will be monitored in the field. The General Land Office (GLO) requires a Miscellaneous Easement (ME) for any ROW crossing a state- owned riverbed or navigable stream. A few rivers/streams within the study area would likely fall into this category, and it is also likely that one or more will be crossed by the approved route of the Proposed Project. Following PUCT approval of a route for the Proposed Project, LCRA TSC will submit an application for ROW on state-owned lands to the GLO for approval. Additionally, LCRA TSC will coordinate with the Guadalupe-Blanco River Authority (GBRA) regarding crossings of the Guadalupe River and associated surface waters, as appropriate. LCRA TSC will obtain necessary permits from HOU 146-103 (PER-02) LCRA (12/4/2015) 138626 DW PAGE 1-7 51 POWER ENGINEERS, INC. Zorn to Marion 345-kV Transmission Line Project GBRA prior to construction and will coordinate with GBRA during the design phase of the project. The Guadalupe River in this area is not a Navigable Water under Section 10 of the Rivers and Harbors Act. Upon approval of this application and prior to construction, a detailed Natural Resources Assessment (NRA) and Cultural Resources Assessment (CRA) will be performed on the approved route. Depending upon the results of these assessments, permits or regulatory approvals may be required from the U.S. Army Corps of Engineers (USACE) or the U.S. Fish and Wildlife Service (USFWS). If LCRA TSC encounters previously unassessed artifacts or cultural resources during project construction, LCRA TSC will stop construction in the immediate vicinity of the site. LCRA TSC will notify and consult with the Texas Historical Commission (THC) and LCRA TSC design staff to develop a process for the site before construction continues. Similarly, as LCRA TSC identifies other obstacles and engineering constraints along the approved route, LCRA TSC will adjust alignments, adjust structure locations/heights, and/or take other actions consistent with a Final Order approving the Proposed Project. After all other alignments and structure locations/heights are adjusted and set based on the permitting and notices described previously, LCRA TSC will make a final determination of the need for Federal Aviation Administration (FAA) notification, based on structure locations and structure designs. Based on potential impacts within the purview of the FAA, LCRA TSC may use structures of lower-than-typical heights in some areas and add marking and/or lighting to certain structures. Appropriate measures will be taken during engineering design to ensure that special provisions of the PUCT's Final Order regarding environmental and ROW concerns are addressed. If necessary, these measures will be added to construction documents, specifications, or other documents. Following completion of the design, a preconstruction meeting will be held, which will include a review of these regulatory provisions. A physical inspection of the project will be performed following project completion to ensure all appropriate measures have been taken during construction. LCRA TSC will report the status of the transmission line project to the PUCT on LCRA TSC's Monthly Construction Progress Report, beginning with the first report following the filing of the CCN application, and in each subsequent monthly progress report until construction is completed and actual project costs have been reported. As required by the PUCT, LCRA TSC will submit location and attribute data for the approved route after it is constructed. HOU 146-103 (PER-02) LCRA (12/4/2015) 138626 DW PAGE 1-8 52 POWER ENGINEERS, INC. Zorn to Marion 345-kV Transmission Line Project 1.4 Description of Proposed Design and Construction 1.4.1 Design Considerations The Proposed Project will be operated as a 345-kV transmission line with bundled 959.6 thousand circular mils (kcmil) aluminum conductor, steel-supported/trapezoidal wire (ACSS/TW) "Suwannee" with two conductors per phase and one fiber optic ground wire (OPGW). A portion of the circuit will be installed on existing double-circuit capable structures and easements beginning at the existing Zorn substation and continuing to a location near the Clear Springs substation. The remaining portion will be installed on new structures and within new easements. LCRA TSC will initially install one 345-kV circuit on the new transmission line portion with the provision for a second circuit to be installed in the future. The Proposed Project will be rated for operation at 3,296 Amperes, yielding a nominal 1969-Megavolt- amperes (MVA) capacity. The configurations of the conductor and shield wires will provide adequate clearance for operation at 345-kV, considering icing and wind conditions. The Proposed Project will be designed and constructed to meet or exceed the specifications set forth in the current edition of the National Electrical Safety Code (NESC) and will comply with all applicable state and federal statutes and regulations. The results of the Natural/Cultural Resource Assessments will be considered when designing and placing new structures. 1.4.2 Typical Structures and Easements LCRA TSC proposes to use 345-kV double-circuit capable pole structures for typical tangent, angle, and deadend structures for the new construction. LCRA TSC has also considered other structure types for the new construction, including lattice towers. The geometries of the proposed and alternative, typical tangent, angle and deadend structures are shown on Figures 1-4 through 1-10. These structure geometries are illustrative. All of these structure types are capable of being constructed, operated, and maintained within the proposed easement widths described below. In some areas, such as transmission line crossings and highway crossings, shorter than typical, taller than typical, or alternative structure types may be utilized. In some locations and along certain route segments, H-frame structures may be used to avoid potential impacts (e.g., New Braunfels Municipal Airport and other FAA facilities). Actual structure types may differ slightly based on newer or different designs available at the time of construction. The new double-circuit capable 345-kV transmission facilities will typically be constructed on new ROW within easements ranging from approximately 120 to 160 feet in width, and using typical spans that range from approximately 900 to 1,500 feet. In some areas, spans could be more or less than the typical spans, depending upon terrain and other engineering constraints. Easement widths could also vary to address HOU 146-103 (PER-02) LCRA (12/4/2015) 138626 DW PAGE 1-9 53 POWER ENGINEERS, INC. Zorn to Marion 345-kV Transmission Line Project similar concerns. Access easements and/or temporary construction easements may be needed in some areas. 1.4.3 Substations The new circuit will connect to the existing LCRA TSC Zorn and Marion substations. Several of the route segments are located near the existing Clear Springs substation, including one segment that passes through the Clear Springs substation. However, the new circuit will not be connected electrically to the Clear Springs substation. Some new construction will be required at the Zorn and Marion substations as part of the scope of the Proposed Project. HOU 146-103 (PER-02) LCRA (12/4/2015) 138626 DW PAGE 1-10 54 Source: LCRA 2015 Figure 1-4 Typical Double-Circuit 345-kV Steel Lattice Tower Tangent Zorn to Marion 345-kV Transmission Line Project ^ PO6AeER ENGINEERS ^^-^ FNFIIGY • Yd1fY • COMM W IR 5P(VK6 55 1-i i Source: LCRA 2015 Figure 1-5 Typical Double-Circuit 345-kV Steel Lattice Tower Angle Zorn to Marion 345-kV Transmission Line Project POWER ^ ^ ,A 3^..Ar.a^.^.UL 1-^6 Source: LCRA 2015 Figure 1-6 Typical Double-Circuit 345-kV Steel Lattice Tower Deadend Zorn to Marion 345-kV Transmission Line Project ER C^^ POtWNEERS ^ FNEPGY • VdIIX • CUMMUNIIY 5!R 1-I3^ Source: LCRA 2015 Figure 1-7 Typical Double-Circuit 345-kV Steel Pole Tangent Zorn to Marion 345-kV Transmission Line Project "" POWER -••^- Ak ENGINEERS E!&MY.