Case 4: Ashland Heritage Oregon White Oak (41.3 in DBH)

STATUS: OA-RCA-v2:ASH-QG-105 | drafts complete: 1/1 | unverified citations: 0

# LEO-RCA Profile 01 Evidentiary Stewardship Brief (ASH-QG-105)

## Slot 1: Epistemic Status & Workstream Header
- **Workstream ID:** `OA-RCA-v2:ASH-QG-105`
- **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:** *Quercus garryana* (Oregon White Oak), tag `ASH-QG-105`
- **Geospatial Anchor:** Plus Code `84JV57VR+R6` (Lat `42.19`, Lng `-122.71`)
- **Governing Municipal Code:** Ashland Municipal Code (AMC) Chapter 18.4.5 (Tree Preservation and Protection), Chapter 18.5.7 (Tree Removal Permits), and AMC 18.3.10.090.D (Hillside Development) (Ashland, OR (or-ashland))
- **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 Oregon White Oak (ASH-QG-105): 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 17.9 cm outer shell across a 52.5 cm trunk radius (t/R = 0.34, above the 0.30 Claus Mattheck hollow-shell buckling threshold), anchored by a 12.35 ft (3.77 m) Structural Root Zone windthrow root plate.
- **Statutory & Seasonal Truth:** Under Ashland Municipal Code (AMC) Chapter 18.4.5 (Tree Preservation and Protection), Chapter 18.5.7 (Tree Removal Permits), and AMC 18.3.10.090.D (Hillside Development) (Ashland, OR (or-ashland)), this 41.34 in DBH specimen is classified as Heritage with a statutory CRZ = 41.34 ft (12.6 m). Permit required: ASH-QG-105 Oregon White Oak (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 $427,039 in 200-year holobiont equity ($23,273 classical CTLA depreciated timber appraisal and $6,201 municipal cash-in-lieu mitigation exposure if destroyed). Day-1 Stage 1 preservation triage starts at $2,816 compared against a one-time removal bid of $3,911, while the 5-year stewardship program delivers a 6.56x net practitioner margin multiplier over liquidation.
- **Physical Falsifier (STIM Kill Criterion):** If Year-1 terminal twig extension remains below 6 cm or upper crown dieback exceeds 15%, re-evaluate for deep vadose water table restriction or secondary root pathogen colonization.

### 3-Stage Phased Stewardship Triage (Total 5-Year Gross: $14,942 | Practitioner Net: $8,218)
- **Stage 1 (Day 1 (Immediate Triage)): Root-Collar Excavation, SGR Relief & Structural Audit** | Client investment: **$2,816** | Practitioner net: **$1,633**
- **Stage 2 (Months 6 to 18): 150 psi Radial AirSpade Decompaction & Biochar-Fungal Inoculation** | Client investment: **$6,669** | Practitioner net: **$3,424**
- **Stage 3 (Years 2 to 5): Native Companion Guild & Year-1 / Year-5 STIM Verification** | Client investment: **$5,457** | Practitioner net: **$3,161**

## Slot 5: Three-Tier Evidence Boundary & Oracle Provenance Anchors
### Tier 1: Deterministic Engine & Measured Biometrics
- Measured DBH (in): [[oracle:rca.structural.dbh_in=41.34]]
- Mattheck Sound Shell Ratio (t/R): [[oracle:rca.biomechanics.t_over_r=0.34]]
- Critical Root Zone Radius (ft): [[oracle:root_zone.crz_ft=41.34]]
- Structural Root Zone Radius (ft): [[oracle:root_zone.srz_ft=12.35]]
- 200-Year Holobiont Living Equity (USD): [[oracle:rca.valuation.holobiont_200yr_usd=427039]]
- CTLA 10th Ed. Depreciated Value (USD): [[oracle:rca.valuation.ctla_depreciated_usd=23273]]
- Municipal Cash-in-Lieu Exposure (USD): [[oracle:ordinance.cash_in_lieu_usd=6201]]
- Day-1 Stage 1 Triage Price (USD): [[oracle:rca.triage.stage1_usd=2816]]

### 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; Ashland Municipal Code (AMC) Chapter 18.4.5 (Tree Preservation and Protection), Chapter 18.5.7 (Tree Removal Permits), and AMC 18.3.10.090.D (Hillside Development).

### 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:** `c87412851e02c8a64e6976840c8cac769e6c2fe17adbaf99df856f4fc4e62345`