Southern California Edison Responds to Federal Energy Regulatory Commission Comments

Southern California Edison (SCE) has submitted a document to the Federal Energy Regulatory Commission (FERC) responding to comments on the Florence Lake Dam Low-Level Outlet Valve Improvement and MIF Pipe Construction Progress Report, Abandonment Project Design Change Notification No. 2, and Plan and Schedule to Address Florence Lake Dam 2022 Part 12D Recommendation Nos. 7 and 8. The response addresses various concerns raised by FERC, including the need for a cover letter statement and the concurrence or disagreement with the consultant's findings and recommendations.

SCE has reviewed the comments and provided the following responses:

• **General**: SCE will correct and resubmit the April 18, 2025, submittal by including a statement that the report has been reviewed by the company's Chief Dam Safety Engineer or Chief Dam Safety Coordinator, and/or staff, and will provide either concurrence or disagreement with the content of the report.
• **Design Change Notification No. 2**: SCE concurs with the consultant's recommendations, including extending the 8-inch pipe through a 6-inch PVC pipe to prevent freezing and evaluate methods to confirm the deiced condition of the pipeline.
• **Plan and schedule**: SCE will submit the final construction report to FERC by March 19, 2026.

Key Takeaways:

• **FERC comments**: The Federal Energy Regulatory Commission provided comments to the letters dated December 26, 2024, and April 18, 2025, that submitted the Low-Level Outlet Valve Improvement and MIF related construction progress report, design change notification, and a plan and schedule to address the 2022 Part 12D Recommendations Nos. 7 and 8 for Florence Lake Dam.
• **SCE responses**: Southern California Edison has reviewed the comments and provided the following responses, addressing concerns in the cover letter statement, design change notification, and plan and schedule.

Statistics:

• **FERC comments date**: The comments were provided on June 17, 2025.
• **SCE response date**: The SCE response was submitted on June 27, 2025.
• **Final construction report submission date**: The final construction report will be submitted to FERC by March 19, 2026.

Sources:

• June 17, 2025 letter from Mr. Frank L. Blackett, P.E., Regional Engineer, Federal Energy Regulatory Commission to Mr. Wayne P. Allen, Principal Manager, Southern California Edison, titled, Florence Lake Dam Low-Level Outlet Valve Improvement and MIF Pipe Construction Progress Report, Abandonment Project Design Change Notification No. 2, and Plan and Schedule to Address Florence Lake Dam 2022 Part 12D Recommendation Nos. 7, and 8
• June 27, 2025 SCE Response to FERC Comments on Florence Lake Dam Low-Level Outlet Valve Improvement and MIF Pipe Construction Progress Report, Abandonment Project Design Change Notification No. 2, and Plan and Schedule to Address Florence Lake Dam 2022 Part 12D Recommendation Nos. 7 and 8