Southern California Edison's Control-Silver Peak Project

Southern California Edison's Control-Silver Peak Project

The Proposed Project would consist of a variety of improvements to existing infrastructure, which would serve to correct identified discrepancies with the GO 95 standards. This would include rebuilding, replacement, and/or modification of existing subtransmission poles and conductors along portions of the Control-Silver Peak ‘A’ and ‘C’ 55 kV circuits. Additionally, SCE proposes to install overhead groundwire (OHGW) and optical groundwire (OPGW) along portions of the subtransmission line alignments, and transfer existing distribution circuitry underbuilt on the subtransmission structures to replacement poles. SCE would install additional telecommunications cables and equipment within and adjacent to existing substations, and would make other improvements within area substations that interconnect with the Control-Silver Peak ‘A’ and ‘C’ 55 kV subtransmission lines. SCE has subdivided the Proposed Project into five segments based on the geographic extent and type of work proposed. The segments and the specific work associated with each one are described below. Segment 1: Segment 1 of the Proposed Project is located west of the City of Bishop. Segment 1 is 3.4 miles in length. There are two single-circuit pole lines in Segment 1. In Segment 1, the existing overhead groundwire (OHGW) that is installed on existing poles along one of the two pole lines found in Segment 1 would be removed and optical groundwire (OPGW) would be installed on those existing poles. Segment 2: Segment 2 of the Proposed Project is located northwest of the City of Bishop. Two existing single-circuit pole lines are located in Segment 2. The existing poles and conductor would be removed, and new poles and conductor would be installed along the 1.4-mile length of Segment 2. OPGW would be installed on new poles along one of the pole lines, and OHGW would be installed on new poles along the other pole line. Segment 3: Segment 3 runs for approximately 37 miles from northwest of the City of Bishop to the California-Nevada border. Two existing single-circuit pole lines are located in Segment 3; the Proposed Project would result in removal of one of the pole lines and conversion of the remaining pole line from a single-circuit configuration to a double-circuit configuration. The existing poles and conductor would be removed, and new double-circuit poles and conductor would be installed along the length of Segment 3. OPGW would be installed on new poles. Segment 4: Segment 4 is located in the Chalfant Valley between the City of Bishop and the community of Hammil. InSegment 4, two existing poles would be removed and two replacement poles would be installed. Theexisting conductor attached to the poles would be transferred to the replacement poles. Insulators andother hardware on adjoining poles may be replaced or modified to accommodate the taller replacementpoles. Segment 5: Segment 5 is located in the Deep Springs Valley. In Segment 5, nine existing poles would be removed and nine replacement poles would be installed. The existing conductor attached to the poles would be transferred to the replacement poles. Insulators and other hardware on adjoining poles may be replaced or modified to accommodate the taller replacement poles. No new substations would be constructed under the Proposed Project. However, modifications at and adjacent to existing substations (i.e., Control, White Mountain, Zack, and Deep Spring substation) and the Fish Lake Metering Station would be necessary to accommodate the installation of new conductor and systems protection equipment. Specifically, the Proposed Project would include the following work at substations: 1. Disconnect existing conductor from existing positions at the White Mountain Substation and connect new conductor to existing positions. 2. Install new OPGW and OHGW and make minor modifications to the exisitng terminal racks at White Mountain Substation to accomodate the new OPGW and OHGW. 3. Install telecommunication equipment on existing rack structures, install cable in new or existing underground cable raceways, and install new or replacement telecommunications infrastructure within existing cabinets, control buildings, or Mechanical and Electrical Equipment Rooms within the Control Substation and at the Fish Lake Valley Metering Station. 4. Update relay settings at Control, Deep Springs, White Mountain, and Zack Substations. 5. Install a capacitor bank and circuit breaker at Fish Lake Valley Metering Station. Project Location

unincorporated areas

Inyo, Mono

Southern California

California Air Resources Board (ARB), California Department of Conservation (DOC), California Department of Forestry and Fire Protection (CAL FIRE), California Department of Parks and Recreation, California Department of Toxic Substances Control (DTSC), California Department of Transportation, District 9 (DOT), California Department of Transportation, Division of Aeronautics (DOT), California Department of Transportation, Division of Transportation Planning (DOT), California Department of Water Resources (DWR), California Energy Commission, California Governor's Office of Emergency Services (OES), California Highway Patrol (CHP), California Natural Resources Agency, California Public Utilities Commission (CPUC), California Regional Water Quality Control Board, Lahontan Victorville Region 6 (RWQCB), California State Lands Commission (SLC), Office of Historic Preservation, Sierra Nevada Conservancy, State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Division of Water Quality, California Native American Heritage Commission (NAHC), California Department of Fish and Wildlife, Inland Deserts Region 6 (CDFW)

California Native American Heritage Commission (NAHC), California Department of Fish and Wildlife, Inland Deserts Region 6 (CDFW)

Other (Remediate existing transmission lines )

N/A

Aesthetics, Agriculture and Forestry Resources, Air Quality, Biological Resources, Cultural Resources, Cumulative Effects, Drainage/Absorption, Energy, Flood Plain/Flooding, Geology/Soils, Greenhouse Gas Emissions, Growth Inducement, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Mineral Resources, Noise, Population/Housing, Public Services, Recreation, Schools/Universities, Septic System, Sewer Capacity, Solid Waste, Transportation, Tribal Cultural Resources, Utilities/Service Systems, Vegetation, Wetland/Riparian, Wildfire