Planning Commission approves SoCalGas restoration amendment to mitigate Diegan coastal sage scrub

The Carlsbad Planning Commission on Aug. 6 voted 5-0 to adopt a resolution approving an amendment to a previously approved restoration and stabilization plan addressing emergency gas-line repairs near Ponto Drive, allowing implementation of defined mitigation and monitoring requirements.

The amendment updates the restoration plan for emergency work SoCalGas completed in February 2020 and reflects revised vegetation mapping, additional agency review and a Coastal Commission requirement to mitigate permanent impacts to Diegan coastal sage scrub at a 2:1 ratio. Associate Planner Alex Allegre presented the staff recommendation and detailed the acreages and schedule to the commission.

Allegre said the project footprint includes a permanent impact of about 0.053 acre (roughly 2,300 square feet) of Diegan coastal sage scrub and a total disturbance area under 0.7 acre. "Based on Coastal Commission input, the required mitigation ratio was increased from 1 to 1 to 2 to 1, doubling the creation requirement," Allegre said. Under the revised plan, SoCalGas must create 0.107 acre of replacement habitat and establish a 0.046-acre reference area to track restoration success.

Staff and the project team described site constraints and agency coordination. Roseanne Humphrey, Habitat Management Plan coordinator for the city, said the mitigation site was selected to be adjacent to existing habitat, outside utility easements and away from nearby development. James Chung, representing SoCalGas, told the commission he was present to answer questions.

The amendment also relies on a temporary access agreement with an adjacent private property owner that allows SoCalGas to stabilize about 0.4 acre on private property; staff said the access agreement covers stabilization work and is expected to be 2–3 years in duration. Commission members clarified that ongoing monitoring and much of the restoration will occur on city-owned right of way and will not require continued private access after stabilization is complete.

Implementation is expected to begin during the 2025–26 rainy season, with site preparation and planting after the first significant rainfall and erosion control and seeding completed by May 2026. The restoration will be followed by a five-year monitoring period with annual reports prepared by a qualified biologist; if performance criteria are not met, the plan requires adaptive measures and the city will verify completion before the plan is considered finished.

Staff recommended and the commission adopted findings that the amendment remains consistent with the certified local coastal program, complies with the city's Habitat Management Plan and municipal code, and qualifies for a categorical exemption under CEQA Guidelines section 15302(c) (replacement of existing utility systems with no increase in capacity). Staff said the draft notice of exemption was posted July 8, 2025, the formal public hearing notice was mailed July 24, 2025, and no public comments were received during the notice period.

Commission discussion touched on the timeline for completing the regulatory and interagency review, the relative scale of the mitigation given the small impacted area, and why the Coastal Commission required a 2:1 mitigation ratio. Commissioner Mertz moved to approve the staff recommendation; Commissioner Burrows seconded. The motion passed 5-0 and the public hearing was closed.

The approved amendment authorizes the restoration and stabilization plan to proceed under the conditions presented to the commission; SoCalGas will fund and carry out the work and monitoring. The city will verify completion of success criteria at the end of the monitoring period.