SL2_SOW_ATCH B_813.pdf

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ENVIRONMENTAL ASSESSMENT FOR REPAIR OF OVERHEAD 70kV TRANSMISSION LINE South Loop 2 VSFB, CA
Solicitation number
FA461026_EA_SL2
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This is a Request for Environmental Impact Analysis (AF Form 813) for repair of an overhead 70 kilovolt transmission line (SL2) at Vandenberg Space Force Base in California. The project involves repairing the SL2 transmission line that serves South Loop 2, which distributes power throughout the base as part of Spaceport of the Future infrastructure.

The proposed action requires replacement of the SL2 transmission circuit with three alternative solutions developed in coordination with the 30th Civil Engineer Squadron. All alternatives include required coordination to avoid identified archaeological sites, maritime chaparral areas, and groundwater monitoring wells, plus mandatory coordination with environmental standards and nesting bird surveys. The purpose is to replace the aging SL2 line to ensure reliable power for the developing space launch range. The project does not qualify for Categorical Exclusion and requires a full Environmental Assessment. The document identifies environmental impact considerations across ten categories including air quality, water resources, biological resources, cultural resources, and hazardous materials. Specific constraints include avoidance of vernal pools through coordinated routing, heritage resource consultation with the California State Historic Preservation Office and Santa Ynez Band of Chumash Indians, potential archaeological testing and monitoring, Endangered Species Act Section 7 consultation, wetland delineation and Section 404/401 Clean Water Act permits, and management of construction equipment to prevent weed introduction. The selected alternative (COA 2) involves overhead repair and rebuild with utility coordination, new access roads, culverts for drainage, and pole replacement strategies including 100 percent replacement of insulators, bonding, guys, and anchors.

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ROWLAND.KYLE.E

VAN.1291055733

Digitally signed by

ROWLAND.KYLE.EVAN.12910557

Date: 2025.11.17 14:32:12 -08'00'

Tracy Curry, NHIII, NEPA Planner 7 Nov 2025

AF IMT 813, 19990901, V1 THIS FORM CONSOLIDATES AF FORMS 813 AND 814

PREVIOUS EDITIONS OF FORMS ARE OBSOLETE

Attachment 1: Location Map – Current Condition

Please note: Lines and points shown on graphic are not to scale.

CUI

AF IMT 813, 19990901, V1 THIS FORM CONSOLIDATES AF FORMS 813 AND 814

Attachment 2: Site Map – COA #1

Please note: Lines and points shown on graphic are not to scale.

Where chaparral is present and road clearing is necessary, road clearing will be limited to 12 feet.

CUI

Please note: Lines and points shown on graphic are not to scale.

Where chaparral is present and road clearing is necessary, road clearing will be limited to 12 feet.

CUI

Attachment 2: Site Map – COA 2 (Selected COA)

Please note: Lines and points shown on graphic are not to scale.

Where chaparral is present and road clearing is necessary, road clearing will be limited to 12 feet.

CUI

Attachment 2: Site Map – COA 3

SL2-COA2-C3XX/XX/XXXX

SL2 GRID INDEX

LEGEND

NEW 20' GRAVEL ROAD

NEW ROAD BARRIER AT END OF PATH

CLEAR, REGRAVEL, AND WIDEN

ROAD TO 20'

NEW CULVERT UNDER GRAVEL ROAD

NOT FOR

CONSTRUCTION

Not to scale

GENERAL NOTES

1. NEW ACCESS ROADS AND TURNAROUNDS WILL REQUIRE COMPACTION

OF SUBGRADE PRIOR TO GRAVEL INSTALLATION. GEOTECHNICAL TESTING

MAY BE RECOMMENDED TO ASSESS SOIL SUITABILITY FOR COMPACTION.

2. ANY LANDSCAPING DISTURBED BY CONSTRUCTION ACTIVITIES SHALL BE

RESTORED TO PRE-CONSTRUCTION CONDITIONS.

3. IN AREAS WHERE IT IS REQUIRED TO CLEAR PROTECTED SPECIES OF

PLANTS AND/OR TREES FOR CONSTRUCTION ACCESS, TRIMMING SHALL BE

PRIORITIZED. IF FULL REMOVAL IS REQUIRED, D-B CONTRACTOR MUST

COORDINATE WITH BASE ENVIRONMENTAL PERSONNEL, AND MITIGATION

EFFORTS MAY BE REQUIRED.

4. EXISTING WOOD POWER POLES TO BE REPLACED SHALL BE REMOVED

BY CUTTING THE POLE TO GRADE.

5. ALL NEW ACCESS ROADS SHALL BE GRADED TO PROVIDE ROAD CENTER

CROWNING AND POSITIVE DRAINAGE AWAY FROM ROAD SURFACE.

6. D-B CONTRACTOR TO INSTALL SILT FENCE AT ALL CONSTRUCTION

LOCATIONS WITH GROUND DISTURBANCE AND/OR GRADING ACTIVITIES.

7. WATER, SANITARY SEWER, COMMUNICATION, NATURAL GAS, AND LIQUID

NITROGEN LINES ARE PRESENT ALONG THE SL1 ROUTE. UTILITIES SHOWN

ON DRAWINGS AND/OR GIS ARE BASED ON VSFB PROVIDED MAPS. D-B

CONTRACTOR IS REQUIRED TO PERFORM SITE UTILITY INVESTIGATION

PRIOR TO INITIATION OF CONSTRUCTION ACTIVITIES. POTENTIAL UTILITY

CONFLICTS ARE TO BE COORDINATED WITH VSFB POC AND GENERAL

CONTRACTOR.

8. IN ENVIRONMENTALLY SENSITIVE AREAS OF CHAPARRAL AND/OR

PROTECTED TREE SPECIES, ROAD WIDTHS SHOULD BE MINIMIZED TO 12'

WHERE POSSIBLE.

APPROXIMATE UXO AREA

VEGETATION CLEARING/TRIMMING AS

NEEDED FOR TEMPORARY

CONSTRUCTION

FINAL CHARRETTE REPORT

SL2 - COA Alternative 2

SL2: XUMU 15-1134CR

KEY NOTES

1. ACCESS ROAD TO BE REROUTED AROUND VERNAL

POOLS IN SURROUNDING AREAS.

2. GRAVEL GRID RECOMMENDED TO PREVENT

EROSION ON GRAVEL ROADS WITH GREATER THAN

10% SLOPE.

3. SL2-24 TO BE REMOVED DUE TO INACCESSIBLE

LOCATION ON CANYON RIDGE. ELECTRICAL LINE TO

SPAN EXISTING POLES SL2-23 TO SL2-25, SEE

ELECTRICAL DRAWINGS FOR MORE INFORMATION.

SL2-COA2-C8XX/XX/XXXX

SL2 GRID INDEX

LEGEND

NEW 20' GRAVEL ROAD

NEW ROAD BARRIER AT END OF PATH

CLEAR, REGRAVEL, AND WIDEN

ROAD TO 20'

RELOCATE LINE

NOT FOR

CONSTRUCTION

Not to scale

GENERAL NOTES

1. NEW ACCESS ROADS AND TURNAROUNDS WILL REQUIRE

COMPACTION OF SUBGRADE PRIOR TO GRAVEL INSTALLATION.

GEOTECHNICAL TESTING MAY BE RECOMMENDED TO ASSESS

SOIL SUITABILITY FOR COMPACTION.

2. ANY LANDSCAPING DISTURBED BY CONSTRUCTION ACTIVITIES

SHALL BE RESTORED TO PRE-CONSTRUCTION CONDITIONS.

3. IN AREAS WHERE IT IS REQUIRED TO CLEAR PROTECTED

SPECIES OF PLANTS AND/OR TREES FOR CONSTRUCTION

ACCESS, TRIMMING SHALL BE PRIORITIZED. IF FULL REMOVAL IS

REQUIRED, D-B CONTRACTOR MUST COORDINATE WITH BASE

ENVIRONMENTAL PERSONNEL, AND MITIGATION EFFORTS MAY BE

REQUIRED.

4. EXISTING WOOD POWER POLES TO BE REPLACED SHALL BE

REMOVED BY CUTTING THE POLE TO GRADE.

5. ALL NEW ACCESS ROADS SHALL BE GRADED TO PROVIDE ROAD

CENTER CROWNING AND POSITIVE DRAINAGE AWAY FROM ROAD

SURFACE.

6. D-B CONTRACTOR TO INSTALL SILT FENCE AT ALL

CONSTRUCTION LOCATIONS WITH GROUND DISTURBANCE

AND/OR GRADING ACTIVITIES.

7. WATER, SANITARY SEWER, COMMUNICATION, NATURAL GAS,

AND LIQUID NITROGEN LINES ARE PRESENT ALONG THE SL1

ROUTE. UTILITIES SHOWN ON DRAWINGS AND/OR GIS ARE BASED

ON VSFB PROVIDED MAPS. D-B CONTRACTOR IS REQUIRED TO

PERFORM SITE UTILITY INVESTIGATION PRIOR TO INITIATION OF

CONSTRUCTION ACTIVITIES. POTENTIAL UTILITY CONFLICTS ARE

TO BE COORDINATED WITH VSFB POC AND GENERAL

CONTRACTOR.

8. IN ENVIRONMENTALLY SENSITIVE AREAS OF CHAPARRAL

AND/OR PROTECTED TREE SPECIES, ROAD WIDTHS SHOULD BE

MINIMIZED TO 12' WHERE POSSIBLE.

KEY NOTES

1. EXISTING LINE FROM SL2-150 TO SL2-245 WAS REBUILT IN 2021

DUE TO DAMAGE TO LINE FROM WILDFIRE. NEW GRAVEL ACCESS

ROADS WERE INSTALLED. NO WORK IS PROPOSED IN THIS

SEGMENT OF SL2.

NEW 12'X30' GRAVEL TURNAROUND

WITH 30' RETURN RADIUS

APPROXIMATE UXO AREA

FINAL CHARRETTE REPORT

SL2 - COA Alternative 2

SL2: XUMU 15-1134CR

NEW CULVERT UNDER GRAVEL ROAD

30 CES/CEIE ENVIRONMENTAL COMMENT FORM

DOCUMENT AUTHOR: 30 CEI Staff DOCUMENT TITLE: 813-25- PROJECT NAME: SL2 COMMENTOR: Multiple DATE OF COMMENTS:

ITEM

NO. STAFF COMMENT

1 K. Loetzerich/Vicich/Curry (Environmental Planners) 805-605-0392/605-0633/606-2044

The proponent for this action is responsible for implementing all applicable management requirements identified below. If the proponent is unable to accommodate these requirements, the proposed action will require additional environmental analysis and this CATEX will not apply.

2 R. Loetzerich/Smallwood/Nocerino (Cultural) 805-606-9687/606-2860/605-0748

This project will trigger Sec 106 and at minimum require consultation with the CA State Historic Preservation Officer and the Santa on the design/route of the proposed power lines, some archaeological survey and testing is likely to be required. Archaeological test American monitor. In order to avoid adverse effects to archaeological sites, the gov archaeologist will work with the power line eng archaeological sites, and/or, if sites cannot be avoided, place them in the least significant portion of an archaeological site, if feasible significant portion of an archaeological site additional mitigation and the development of a Memorandum of Agreement will be requ

3 Whitsitt-Odell (Natural) 805-606-4198

Endangered Species Act section 7 consultation required due to potential effects to federally listed threatened and endangered species. Project must adhere to Migratory Bird Treaty Act (MBTA) requirements, see attached comments.

4 Lum (Wetlands, Clean Water Act 401/404) 805-606-5299

Jurisdictional waters may be affected in creek/drainage areas. Section 404/401 CWA permit required depending on design across jurisdictional waters. Wetland delineation and analysis required by project proponent with mitigation and restoration of riparian and creek area including development of a 5-year mitigation plan. Spanning or avoidance of jurisdictional waters does not require a permit or mitigation. Early coordination with CEIEA is highly recommended. See additional comments.

5 Harding (Air) 805-606-6863

Adequate information to estimate emissions with ACAM was not provided. Based on NEPA planners estimation, there will be an EA needed for this project and the SL1 powerline. Emissions will be provided in the EA.

6 Wiskowski (Clean Water Act 402) 805-606-7541

See attached comments.

The maps provided are too small to clearly understand the scope. Design review is required.

The laydown area near the pin for pole SL2-024 remains subject to further review.

The proposed new gravel roads and culverts in drainages remain subject to further review - Site specific items 9, 13 & 34.

7 Kalata (Drinking Water/Wastewater) 805-605-0342

At the present time there are no DW or WW concerns noted, although this may change as the designs are submitted for review.

8 Richmond (Greenhouse gases/Ozone Depleting Substances) 805-606-2068

There are no SF6 pieces of equipment named in these changes and therefore there are no concerns for GHG/ODS.

9 Richmond/Kalata (Hazardous Materials/Tanks) 805-606-2068/605-0342

No Tanks or Hazardous Materials are mentioned in the documents, therefore there are no Tank/HazMat Concerns.

10 Hyder (Hazardous & Solid Waste) 805-606-2359

There will be concerns with the disposal of the old power poles. We’ll address that as the designs are submitted.

30 CES/CEIE ENVIRONMENTAL COMMENT FORM

ITEM

NO. STAFF COMMENT

11 Holloway (Asbestos/ Lead Based Paint) 805-606-5725

Sections 5.8 and 5.9 cover and address all ACM/LBP concerns.

12 Holston/Garcia (Installation Restoration Program/Military Munitions Response Program) 805-605-8794/480- 528-2400

The proposed and alternate alignments and other affected areas cross over IRP and MMRP sites. Avoid existing IRP wells and remediation system components; damage to any assets must be repaired by the proponent or contractor. Coordinate with the IRP project managers to determine the optimum routing and identify any worker safety concerns. Coordination with Weapons Safety to determine the safe conduct of work within MMRP sites.

Measures for 813-25-043 Repair OH 70kV Transmission Line SL2

L Lum Comments 04 Nov 2025

Further coordinate with and implement these measures with Luanne Lum at (805) 606- 5299 or luanne.lum@spaceforce.mil:

1. Contact luanne.lum@spaceforce.mil at least two weeks prior to site activities for required briefing and inspection of weed seeds on equipment vehicles (dozers, mowers etc.); clean heavy equipment of weed seeds as follows:

• Equipment vehicles shall be thoroughly cleaned (power washed) of weed seeds, dirt, and caked mud prior to use in the project area to prevent the introduction of weeds.

• Prior to site transport, any skid plates shall be removed and cleaned. Equipment should be cleaned of weed seeds daily especially wheels, undercarriages, and bumpers.

• Prior to leaving the project area, for vehicles that have caked-on dirt or mud, vehicles shall be cleaned with hand tools such as bristle brushes and brooms at a designated exit area; vehicles may subsequently be washed at the AAFES car wash or approved wash area.

• For vehicles with dry dusted dirt on vehicles (and no caked-on dirt or mud), prior to leaving a site at a designated exit area, equipment vehicles shall be thoroughly brushed; vehicles may alternatively be air blasted on site.

2. Avoid as much native plant vegetation as possible. Requirements for projects with temporary vegetation and ground disturbance (e.g. access roads) include the following.

• Provide to CEIEA initial, pre-construction component plant list with percent of native plant cover prior to construction ground disturbing activities preferably with plan below.

• Provide a seeding and planting plan/strategy for approval. Coordinate plantings/seed mix that may be similar to surrounding native vegetation with CEIEA. Collect native seed available on site where vegetation is removed and in adjacent areas and properly store for future site dispersal. May compliment with outside source if needed but source should be from the California coast close to the project region. Thoroughly clean equipment vehicles as specified prior to work activities. Remove iceplant and properly dispose prior to work in the area. Any native vegetation designated for removal or disturbance shall be mulched and salvaged for use in restoration as mulch material where appropriate. The top 4 inches of soil where native vegetation is present shall be salvaged and used as topsoil in the project area. Any topsoil imported shall be weed-free and clean as specified. Soil must be properly prepared to provide seed germination. Amendments may be necessary.

• Control weeds for one year post-construction to achieve at least the same amount or more of pre- construction native plant cover. After one year, provide report with plant list and cover, then coordinate site inspection with CEIEA for approval. Approval is dependent upon amount of native plant cover achieved. Plants shall be watered as necessary without overwatering.

mailto:luanne.lum@spaceforce.mil mailto:luanne.lum@spaceforce.mil

3. Prefer that willows be trimmed or cut without root removal whenever feasible. If willows are removed, restoration and willow mitigation is required. Willow cuttings from the site or adjacent/nearby area will be a minimum of 6-feet tall and range from 0.75-inches to 1.5-inches in diameter. Holes 3.5-inches in diameter and up to a depth of 5-feet will be dug. Where applicable, heavy equipment may be used to assist hole digging. Each hole will receive one willow cutting and either 1) backfilled using a water stinger to inject water into the ground next to the hole for sandy dune soil or 2) infilled with native slurry soil mixture, where applicable. After installation, the distal end of each willow pole will be cut at an angle approximately one foot above the ground. Provide applicable watering as necessary and monitor for at least one year.

4. Heavy equipment vehicles should minimize work in riparian, pools, and wet/ponded areas during the dry season; avoid work in these areas during the wet season. If any equipment vehicles enter the riparian, pool, and wet areas on a regular basis during construction activities, protective matting such as Dura-Base/swamp mats that are designed for wetland protection shall be used to cross or conduct activities in these areas.

Protective matting shall be removed as soon as practicable.

5. Maritime chaparral provides habitat for sensitive resources and regionally endemic plants. Chaparral shall be avoided or disturbance minimized whenever possible. Direct access from existing roads or non-native herbaceous habitat shall be prioritized. If temporary disturbance or access through chaparral habitat is necessary, if vegetation needs removal, vegetation shall be cut keeping root systems intact and Durabase type construction mats shall be used for equipment access. Construction mats shall be removed as soon as possible.

6. For temporary access routes with native vegetation, prefer vegetation be cut and shrub root systems remain intact.

813.pdf
01_CommentForm.pdf
813-25-043_Repair OH SL2_LL Comments.pdf
2025-11-17T15:45:28-0800
CURRY.TRACY.L.1300415110

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