Sewickley Hills Forest Carbon Offsets

Audit Analysis

The Sewickley Hills (Buerkle Woodlands) urban forest preservation project under the City Forest Credits standard demonstrates solid additionality (combined test, VVB-confirmed), strong permanence (40-year commitment with permanent restrictive covenants, no reversals), and a 10% buffer pool. However, the project-specific baseline, a contradiction between the validation and verification reports on the claimed ERR (4,908 vs 5,453 tCO₂e), and the absence of a stated leakage deduction percentage introduce moderate uncertainty. The verifier confirmed the claims are accurate or conservative, which mitigates over-crediting risk.

Project Description

Red Flags

• ⚠Contradiction in claimed ERR: the validation report (2022-11-14) states 4,908 tCO₂e while the verification report (2022-11-11) states 5,453 tCO₂e; the 14.8× pro-rata over-delivery relative to the ex-ante lifetime estimate warrants scrutiny despite the verifier's 'conservative' finding
• ⚠Leakage was described as 'quantified' in the verification report, but the specific deduction percentage was not found in any extracted document, leaving the magnitude of the leakage adjustment unverified
• ⚠Baseline is project-specific rather than jurisdictional or standardised, and no baseline reassessment date is recorded in the available documents

Credit Vintages Exhausted