Carbon Hill

Integrity

The verification report (2025) confirms additionality via an investment test and reports no material findings, which supports integrity. However, the baseline is described only as project-specific in the extracted record, and the timing of any baseline reassessment was not found, increasing uncertainty. Leakage deduction and justification were not found in the extracted record, and permanence risk management details (buffer contribution and any reversal provisions) were also not found, which are important for biochar removal quality. A corrective action on “Biochar Density” in the verification report (2025) suggests a quantification control weakness affecting credited removals.

Transparency

The verification report (2025) provides clear basic metadata, including the VVB name (EnergyLink Services), methodology (Puro.earth Biochar Methodology v3.1), and the monitoring period (2023-09-01 to 2025-02-28). However, the extracted record does not include total removals claimed or total removals verified, preventing a transparent check of issuance quantities against monitoring results. Key MRV elements such as biochar usage monitoring method and any fossil/non-fossil biomass fraction approach were not found in the extracted record.

Claim Safety

Because total claimed and verified removals were not found in the extracted record, the risk of over-crediting cannot be meaningfully evaluated from the available data. CORSIA eligibility and CCP status were not found in the extracted record, so buyers cannot easily infer how the credits may be marketed across integrity labels. The presence of a corrective action related to biochar density in the verification report (2025) increases the risk that credited quantities could be sensitive to measurement assumptions unless clearly resolved and re-verified.

Documentation

Documentation is moderately strong in recency, with a verification report dated 2025-12-16 and an indicated set of 6 documents used. Still, the evidence document list is not specific (listed as “unknown”), which reduces auditability for third parties. Extraction confidence is medium, and the verification report (2025) required a corrective action on biochar density, both of which reduce confidence that all key quantitative fields were captured cleanly in the extracted record.

Overall

No contradictions were listed in the extracted record, so there were no cross-document discrepancies to resolve. Overall quality is constrained mainly by missing quantitative MRV outputs (claimed and verified removals), missing leakage treatment, and missing permanence risk controls (buffer/reversal provisions), despite a recent verification and VVB-confirmed additionality. If documentation were to score below 3.0, transparency would be capped by the gate rule; and if integrity were below 4.0, overall would be capped at 6.0—neither cap is triggered by the scores assigned here.