Case 5: Medford Heritage Ponderosa Pine (26 in DBH)

STATUS: OA-RCA-v2:MFD-PP-208 | drafts complete: 1/1 | unverified citations: 0

# LEO-RCA Profile 01 Evidentiary Stewardship Brief (MFD-PP-208)

## Slot 1: Epistemic Status & Workstream Header
- **Workstream ID:** `OA-RCA-v2:MFD-PP-208`
- **Schema & Profile:** `RCA_v2` / `LEO-RCA-Profile-01`
- **Declared Epistemic Gaps:** `0`

## Slot 2: Sovereign Airlock & Fiduciary Boundary
- **Local Execution Airlock:** Computed deterministically in zero-dependency ECMAScript Modules with zero cloud runtime telemetry.
- **Fiduciary Separation:** Diagnostic biomechanics are decoupled from timber removal bidding. Municipal permit applications and site work require direct owner and credentialed arborist sign-off.

## Slot 3: Point-of-Use Resolution
- **Subject Specimen:** *Pinus ponderosa* (Ponderosa Pine), tag `MFD-PP-208`
- **Geospatial Anchor:** Plus Code `84JV84GG+JQ` (Lat `42.33`, Lng `-122.87`)
- **Governing Municipal Code:** Medford Municipal Code (MMC) Sections 6.700 to 6.750 (Public and Street Trees); Medford Land Development Code (MLDC) § 10.780 (Landscaping); City of Medford Tree Protection Guidelines (April 2026) (Medford, OR (or-medford))
- **Point-of-Use Terms:** `DBH` = Diameter at Breast Height (4.5 ft); `t/R` = outer sound wood shell thickness divided by trunk radius (Mattheck 0.30 threshold); `CRZ` = Critical Root Zone; `SRZ` = Structural Root Zone windthrow plate; `STIM` = Soil and Tree Integrated Monitoring.

## Slot 4: Answer-First Verdict, Phased Triage & Physical Falsifier
- **Headline Verdict:** Preserve Ponderosa Pine (MFD-PP-208): the outer living wood cylinder exceeds the 0.30 Claus Mattheck stability threshold and qualifies for phased rhizosphere stewardship rather than removal.
- **Structural Truth:** The living wood cylinder retains a 13.5 cm outer shell across a 33 cm trunk radius (t/R = 0.41, above the 0.30 Claus Mattheck hollow-shell buckling threshold), anchored by a 10.19 ft (3.11 m) Structural Root Zone windthrow root plate.
- **Statutory & Seasonal Truth:** Under Medford Municipal Code (MMC) Sections 6.700 to 6.750 (Public and Street Trees); Medford Land Development Code (MLDC) § 10.780 (Landscaping); City of Medford Tree Protection Guidelines (April 2026) (Medford, OR (or-medford)), this 26 in DBH specimen is classified as Heritage with a statutory CRZ = 26 ft (7.92 m). Permit required: MFD-PP-208 Ponderosa Pine (pruning). No active seasonal Oak Wilt pruning vector restriction is flagged for this specimen and jurisdiction.
- **Stewardship vs. Liquidation:** Preserving this living canopy asset retains $111,332 in 200-year holobiont equity ($11,102 classical CTLA depreciated timber appraisal and $2,600 municipal cash-in-lieu mitigation exposure if destroyed). Day-1 Stage 1 preservation triage starts at $2,065 compared against a one-time removal bid of $2,868, while the 5-year stewardship program delivers a 5.67x net practitioner margin multiplier over liquidation.
- **Physical Falsifier (STIM Kill Criterion):** If Year-1 needle retention drops below 3 age classes or bark beetle pitch tubes exceed 2 per bole quadrant, initiate immediate hydration and pheromone defense protocol.

### 3-Stage Phased Stewardship Triage (Total 5-Year Gross: $9,469 | Practitioner Net: $5,208)
- **Stage 1 (Day 1 (Immediate Triage)): Root-Collar Excavation, SGR Relief & Structural Audit** | Client investment: **$2,065** | Practitioner net: **$1,198**
- **Stage 2 (Months 6 to 18): 150 psi Radial AirSpade Decompaction & Biochar-Fungal Inoculation** | Client investment: **$4,072** | Practitioner net: **$2,085**
- **Stage 3 (Years 2 to 5): Native Companion Guild & Year-1 / Year-5 STIM Verification** | Client investment: **$3,332** | Practitioner net: **$1,925**

## Slot 5: Three-Tier Evidence Boundary & Oracle Provenance Anchors
### Tier 1: Deterministic Engine & Measured Biometrics
- Measured DBH (in): [[oracle:rca.structural.dbh_in=26]]
- Mattheck Sound Shell Ratio (t/R): [[oracle:rca.biomechanics.t_over_r=0.41]]
- Critical Root Zone Radius (ft): [[oracle:root_zone.crz_ft=26]]
- Structural Root Zone Radius (ft): [[oracle:root_zone.srz_ft=10.19]]
- 200-Year Holobiont Living Equity (USD): [[oracle:rca.valuation.holobiont_200yr_usd=111332]]
- CTLA 10th Ed. Depreciated Value (USD): [[oracle:rca.valuation.ctla_depreciated_usd=11102]]
- Municipal Cash-in-Lieu Exposure (USD): [[oracle:ordinance.cash_in_lieu_usd=2600]]
- Day-1 Stage 1 Triage Price (USD): [[oracle:rca.triage.stage1_usd=2065]]

### Tier 2: Literature & Statutory Calibration
- Claus Mattheck hollow-cylinder buckling criterion (t/R >= 0.30); Australian AS 4970-2009 SRZ; ANSI A300 Part 5 root-zone management; Nowak (1994, 2006) allometrics; Medford Municipal Code (MMC) Sections 6.700 to 6.750 (Public and Street Trees); Medford Land Development Code (MLDC) § 10.780 (Landscaping); City of Medford Tree Protection Guidelines (April 2026).

### Tier 3: Explicit Unverified Epistemic Boundaries
- Zero unverified statutory or instrument gaps recorded in this brief.

## Slot 6: Cryptographic SHA-256 Receipt
- **Canonical Assessment SHA-256:** `607b4b310c63c5a3e2b65f5749c3ef7d61b9150055b60ec08fb83245a5850354`