Coast Live Oak Near New Basement: Protect Critical Root Zone

Construction Plan Risks

28″ DBH oak, 17 ft from new basement. Critical root zone radius = 1.5× DBH = 42 ft. New excavation likely within this zone.

Key Risks

• Root cutting from basement dig.
• Compaction from machinery.
• Old foundation removal may tear roots grown under slab.

Mitigation

1. Fence 42‑ft radius; zero equipment/storage inside.
2. Hand‑dig or air‑spade near roots.
3. Fertilize: 1 lb 10‑10‑10 per inch DBH now and fall.
4. Expect some branch dieback on construction side.

If oak is on neighbor’s lot, consult city forester/arborist before proceeding.