At the planning-basis FWDC, ACM deployment produces a net positive fiscal position from Year 2 — growing from +$17.50/ton in Year 2 to +$91/ton at Year 30 steady state — against a State A trajectory of uninterrupted cost escalation with a 2027 hard deadline.
Inherited Data Confidence Flags — Propagated from Proposal and Waste Study
The following data-confidence conditions are inherited from the Proposal and Waste Study and govern this review. All derived figures carry the confidence level of their weakest input.
- MSW annual volume (~750,075 TPY): Estimated. 2024 RIRRC actual figure not yet published; 2018 operational data used as basis.
- Wastewater sludge annual volume (~74,825 TPY dry): Estimated. Woonsocket component (~38,000 dry TPY) is verified by public reporting; NBC and municipal WWTP balance is estimated.
- Incinerator residue ash annual volume (~50,005 TPY): Estimated. Woonsocket ash fraction calculable; additional volumes estimated.
- Coal ash annual volume (~20,075 TPY): Estimated. No public aggregate data; derived from RIDEM inactive site inventory and legacy plant records.
- FWDC ($101.67/ton): Modeled blended calculation. Individual stream disposal rates are estimated from public data. Subject to verification in Community Feasibility Study.
- Deployment timeline: Carbotura standard schedule; T0 not yet confirmed by state authority. All milestone dates are estimated.
- Site (P1 — Johnston/RIRRC Campus): Provisional; subject to feasibility study and RIRRC site agreement.
- Employment and ACM impact metrics: Estimated using Carbotura standard parameters scaled to deployment configuration.
§1 — Introduction and Decision Summary
§1.1 — What This Review Measures
This Environmental and Investment Review (EIR) is a delta model. It quantifies the difference between two defined system states:
- STATE A — Current System: Rhode Island's existing waste disposal infrastructure as diagnosed in the Waste Study. No re-diagnosis is conducted here.
- STATE B — With Carbotura: The ACM deployment configuration locked in the Proposal EIR Input Block. No new values are introduced. All State B figures trace exclusively to that Block.
The EIR does not evaluate technology performance. It does not assess site engineering. It models the fiscal, economic, and environmental delta that results from substituting State B for State A at the locked parameters.
§1.2 — Decision Summary Table
| Item | State A — Current System | State B — Year 1 (Pre-Royalty) | State B — Year 2+ (With Royalty) |
|---|---|---|---|
| Annual disposal cost — Phase Initial volume (132,000 TPY) | ~$13.42M MOD | $13.20M (TMC only) | Net +$2.31M (royalty − TMC) |
| Per-ton fiscal position | −$101.67/ton | −$100.00/ton (TMC only) | +$17.50 → +$91/ton by Year 30 |
| State capital obligation | Growing: landfill expansion + sludge displacement | $0 | $0 |
| Key unverified inputs | FWDC ($101.67/ton MODELED); stream volumes ESTIMATED; site PROVISIONAL — all subject to Community Feasibility Study | ||
| Decision deadline | Q2 2026 — Authorize Community Feasibility Study. Synagro contract at Woonsocket expires 2027. Under Carbotura standard schedule, a Q2 2026 authorization produces Phase Initial COD ~Q2 2028. | ||
| Cost of delay (per year) | Sludge displacement to out-of-state routes: $89–160+/ton × displaced volumes. Each additional year of planning delay adds ~$5–12M in incremental sludge disposal costs across the state. ESTIMATED | ||
§1.3 — Fiscal vs. Regional Economic Separation
Required Declaration
County/state direct fiscal effects (TMC Fee obligations, Circular Royalty receipts, disposal cost displacement) and regional economic effects (employment, supply chain activity, annual economic impact) are distinct and non-interchangeable categories. This review quantifies each separately and does not combine them. Any analysis that adds regional economic activity to direct fiscal receipts to produce a single net figure is methodologically incorrect.
§2 — State A Baseline
Source: Waste Study (all values). No new diagnosis. Registry values locked.
§2.1 — Feedstock Volume and Disposition
| Stream | TPY EST | TPD | Current Disposition | Operator |
|---|---|---|---|---|
| MSW | ~750,075 | ~2,055 | RIRRC Central Landfill (~96%) | Rhode Island Resource Recovery Corporation |
| Wastewater Sludge (biosolids) | ~74,825 | ~205 | Woonsocket TCF incineration + RIRRC landfill + out-of-state | Synagro Technologies / NBC / municipal WWTPs |
| Incinerator Residue Ash | ~50,005 | ~137 | RIRRC Central Landfill | Synagro / City of Cranston / RIRRC |
| Coal Ash (legacy) | ~20,075 | ~55 | RIRRC landfill / site remediation | Rhode Island Energy / EPA-supervised parties |
| TOTAL | ~895,000 | ~2,452 | Single disposal point (RIRRC Central Landfill); two sludge incinerators | |
§2.2 — State A Cost Structure
| Cost Element | $/ton | Annual Spend | Source Type |
|---|---|---|---|
| MSW disposal (blended municipal/commercial) | ~$85 | ~$63.8M | ESTIMATED |
| Sludge disposal (blended in-state/out-of-state) | ~$170 | ~$12.7M | ESTIMATED |
| Incinerator residue ash | ~$100 | ~$5.0M | ESTIMATED |
| Coal ash (legacy disposal) | ~$100 | ~$2.0M | ESTIMATED |
| FWDC — blended 2,452 TPD | $101.67 | ~$83.5M | MODELED |
§2.3 — State A Cost Trajectory
Three documented mechanisms drive State A costs upward on a compounding basis:
- Rate escalation. RIRRC municipal tipping fees have risen from $32/ton (FY2015–16) to an estimated $63–70/ton today — approximately 7% CAGR. Commercial rates have escalated from $56–90/ton to an estimated $125–130/ton range over the same period.
- Capital reinvestment pressure. The Woonsocket TCF requires $40–50M in capital upgrades with neither the City nor contractors willing to invest. 2027 Synagro exit forces municipalities to out-of-state disposal at $89–160+/ton. No in-state replacement exists within the statutory WTE prohibition framework.
- No competitive alternatives. WTE is prohibited by RI state law. Rail haul costs $89–100/ton. A new landfill requires 10–12 years to permit and construct. State A cost trajectory is upward with no downward pressure mechanism.
§2.4 — State A Environmental and Structural Position
- RIRRC Central Landfill is an EPA Superfund site on the National Priorities List since 1986. Each additional ton landfilled extends environmental monitoring obligations and closure liability.
- Woonsocket TCF has documented permit violations, odor complaints, and Blackstone River discharge events. A federal class-action lawsuit was filed in 2023.
- At current disposal rates, Rhode Island generates ~895,000 TPY of manufacturing feedstock with no in-state processing alternative — 100% of the identified volume is subject to landfill depletion by 2046.
§3 — State B Deployment Baseline
Source: Proposal EIR Input Block exclusively. All values propagated verbatim.
§3.1 — Inherited Flags (State B)
All State B figures carry the confidence level assigned in the Proposal. Site designation is provisional. Timeline is estimated using the Carbotura standard deployment schedule. TMC Fee and Royalty parameters are locked. Derived financial outcomes are estimated. Capital structure is locked at Carbotura defaults.
§3.2 — Deployment Configuration
| Phase | TPD | Modules | TPY (330 days) | CapEx | COD | State Capital |
|---|---|---|---|---|---|---|
| Phase Initial | 400 | 4 × 100 TPD | 132,000 | $247.5M | T0+24 mo (~Q2 2028) | $0 |
| Phase Medium | 800 | 8 × 100 TPD | 264,000 | $477.5M cumul. | T0+42 mo (~Q4 2029) | $0 |
| Phase Expanded | 1,200 | 12 × 100 TPD | 396,000 | $707.5M cumul. | T0+60 mo (~Q4 2031) | $0 |
§3.3 — Economic Terms (State B)
| Term | Value | Status |
|---|---|---|
| TMC Fee — Year 1 | $100.00/ton | LOCKED |
| TMC Fee escalator | 2.5%/year | LOCKED |
| Royalty base rate | 120% of Year 1 TMC ($120/ton) | LOCKED |
| Royalty escalator | +1pp/year | LOCKED |
| Payment lag | 13 months after corresponding TMC payment | LOCKED |
| COA term | 30 years | LOCKED |
| State capital obligation | $0 | LOCKED |
§3.4 — Residual Obligations
Under the COA, Carbotura assumes full responsibility for managing all non-converted residual fraction of feedstock. The State bears no residual disposal obligation. Any material not converted to industrial product is managed by Carbotura under its own permit obligations. The State's financial exposure is limited to the TMC Fee per ton delivered.
§3.5 — Timeline Anchoring
T0 assumed January 2026. All milestones use Carbotura standard deployment schedule. Phase Initial COD ~Q2 2028 — before full 2027 sludge displacement. First Circular Royalty payment ~Q3 2029 (T0+37 months). All dates estimated.
§3.6 — Phase Delta Map
Geographic comparison: State A infrastructure (current system) vs. State B ACM Priority 1 candidate site. State A elements shown in steel/grey tones; State B ACM site shown in Emerald.
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PHASE DELTA — STATE A vs. STATE B
STATE A — CURRENT SYSTEM
RIRRC Central Landfill
Johnston, RI · RIRRC
~2,200 TPD inbound · EPA Superfund site · Projected capacity ~2046
~2,200 TPD inbound · EPA Superfund site · Projected capacity ~2046
Woonsocket Thermal Conversion Facility
Woonsocket, RI · Synagro / Jacobs
~105 dry TPD sludge · Synagro contract expires 2027 · City seeking closure
~105 dry TPD sludge · Synagro contract expires 2027 · City seeking closure
Field's Point WWTF (NBC)
Providence, RI · Narragansett Bay Commission
77 MGD capacity · RI's largest sludge generator · Displacement risk 2027+
77 MGD capacity · RI's largest sludge generator · Displacement risk 2027+
Bucklin Point WWTF (NBC)
East Providence, RI · Narragansett Bay Commission
46 MGD · Blackstone Valley service area
46 MGD · Blackstone Valley service area
Cranston Sludge Incinerator
Cranston, RI · City of Cranston
Second of two RI sludge incinerators
Second of two RI sludge incinerators
STATE B — WITH CARBOTURA
ACM Phase Initial — P1 Site
Johnston / RIRRC Campus Zone, RI
400 TPD Phase Initial · 132,000 TPY · COD ~Q2 2028
Zero state capital · TMC $100/ton · Royalty from Month 13
400 TPD Phase Initial · 132,000 TPY · COD ~Q2 2028
Zero state capital · TMC $100/ton · Royalty from Month 13
Phase Delta Map sources: RIRRC (rirrc.org); NBC (narrabay.com); RI Monthly + RI Current (Feb–Sept 2025) — Woonsocket TCF; Proposal EIR Input Block — P1 site coordinates (41.820°N, 71.520°W). State A = Steel/Grey tones. State B = Emerald. Verification: March 2026.
§4 — Delta Analysis
§4.1 — Three Delta Components
The net fiscal delta between State A and State B consists of exactly three components, which must be separately quantified:
- Gross Cost Displacement. The disposal cost avoided by substituting TMC Fee for State A FWDC. In Year 1 at Phase Initial: $101.67/ton × 132,000 TPY = $13.42M avoided; minus $100/ton × 132,000 = $13.20M paid = +$220K gross saving.
- Circular Royalty Cash Flow. Payments received from Carbotura beginning Month 13. Year 2: $120/ton × 132,000 TPY = $15.84M received; minus $102.50/ton × 132,000 = $13.53M TMC paid = net +$2.31M. Growing each year.
- Residual Obligation. Zero. Carbotura assumes full contractual responsibility for managing non-converted residuals. State bears no residual disposal cost.
Contractual Royalty Language — Three Required Statements
1. Gross cost displacement is quantified separately from Circular Royalty cash flow. Full net fiscal position reflects both.
2. At steady state, the Circular Royalty is designed to exceed the TMC Fee on a per-ton basis.
3. Circular Royalty payments begin 13 months after corresponding TMC Fee payments and ramp to full run-rate on a rolling basis.
§4.2 — Phase-by-Phase Comparative Table
| Metric | Phase Initial (132K TPY) | Phase Medium (264K TPY) | Phase Expanded (396K TPY) |
|---|---|---|---|
| State A cost for volume (FWDC × TPY) | ~$13.42M/yr MOD | ~$26.84M/yr | ~$40.26M/yr |
| State B TMC Year 1 (pre-royalty) | $13.20M/yr | — | — |
| State B TMC Year 2 | $13.53M/yr | — | — |
| Royalty Year 1 | $0 (pre-royalty period) | — | — |
| Royalty Year 2 (120% × Year 1 TMC) | +$15.84M received | — | — |
| Net Year 1 vs. State A | +$220K gross saving | — | — |
| Net Year 2 vs. State A (royalty − TMC) | +$2.31M | — | — |
| Residual disposal obligation | $0 (Carbotura bears) | $0 | $0 |
| State capital obligation | $0 | $0 | $0 |
§4.3 — Pre-Royalty Period Separation
Required Distinction — Pre-Royalty and Post-Royalty Periods
Year 1 and post-Month 13 periods have materially different fiscal characteristics. They must not be combined. Year 1 represents the pre-royalty period: the State pays the TMC Fee ($100/ton × 132,000 TPY = $13.20M) and receives zero Circular Royalty. This period lasts exactly 12 months. Beginning in Month 13, the first Circular Royalty payment arrives (covering Month 1's TMC at 120% = $120/ton) and the fiscal position shifts to net positive. Presenting a blended average across Year 1 and Year 2+ would materially misrepresent the fiscal structure.
§4.4 — 30-Year Gross Cost Displacement
| Year | State A FWDC/ton (est. 3%/yr escalation) | TMC/ton (2.5%/yr) | Gross Displacement/ton | Annual Gross — Phase Initial |
|---|---|---|---|---|
| Year 1 | $101.67 | $100.00 | +$1.67 | +$220K |
| Year 5 | $117.79 | $110.38 | +$7.41 | +$978K |
| Year 10 | $136.56 | $128.01 | +$8.55 | +$1.13M |
| Year 20 | $183.58 | $160.49 | +$23.09 | +$3.05M |
| Year 30 | $246.73 | $203.28 | +$43.45 | +$5.74M |
| 30-yr cumulative | ~$62M gross cost displacement — Phase Initial EST | |||
State A FWDC escalated at 3%/year (conservative documented trajectory). TMC at 2.5%/year (locked). All figures ESTIMATED. ESTIMATED
§4.5 — 30-Year Circular Royalty
| Year | Royalty Rate | Royalty/ton Received | TMC/ton Paid | Net Royalty Position/ton | Annual Net — Phase Initial |
|---|---|---|---|---|---|
| Year 1 | — | $0 | $100.00 | −$100.00 | −$13.20M |
| Year 2 ← crossover | 120% | $120.00 | $102.50 | +$17.50 | +$2.31M |
| Year 5 | 123% | $132.46 | $110.38 | +$22.08 | +$2.91M |
| Year 10 | 128% | $155.96 | $128.01 | +$27.95 | +$3.69M |
| Year 20 | 138% | $215.24 | $160.49 | +$54.75 | +$7.23M |
| Year 30 | 148% | $294.49 | $203.28 | +$91.21 | +$12.04M |
| 30-yr cumulative net | ~$153M EST | ||||
§4.6 — Phase Cost Comparison: State A vs. State B Net
Annual Fiscal Position — State A vs. State B · Phase Initial · Years 1–30
State B net fiscal position crosses into positive territory at Month 13 (Year 2) and grows continuously. State A cost rises at approximately 3%/year with no ceiling or offset mechanism.
State A — Annual disposal cost ($M)
State B — Annual net (TMC − Royalty) ($M)
Pre-royalty (Year 1)
State A: FWDC $101.67/ton escalated 3%/yr × Phase Initial 132,000 TPY. State B net: Royalty received minus TMC paid × 132,000 TPY. Year 1 shown at bottom (negative/pre-royalty). All ESTIMATED. ESTIMATED
30-Year Cumulative Net Fiscal Position — Phase Initial
Cumulative net position crosses into positive territory in Year 2 and reaches approximately +$153M by Year 30. State A cumulative cost over the same period reaches approximately $530M+ for Phase Initial volume.
State A — Cumulative disposal cost
State B — Cumulative net fiscal position
Net positive zone
State A: FWDC $101.67/ton × 132,000 TPY escalated 3%/yr cumulative sum. State B: cumulative net (Royalty received − TMC paid). Crossover: ~Year 2. 30-year net: ~$153M positive. All ESTIMATED. ESTIMATED
§5 — System-Level Impact
§5.1 — Employment Delta
The following figures represent regional economic activity, not direct county fiscal receipts. They must not be added to direct fiscal effects.
| Employment Effect | Phase Initial | Phase Expanded | Status |
|---|---|---|---|
| State A direct employment (waste sector status quo) | ~142 total RIRRC personnel; ~100+ private hauler/operator FTE — no growth trajectory | ESTIMATED | |
| State B direct employment (ACM operations) | 120 FTE | 360 FTE | ESTIMATED |
| State B indirect employment (supply chain) | 360 jobs | 1,080 jobs | ESTIMATED |
| Annual regional economic impact (State B) | ~$28M | ~$84M | ESTIMATED |
§5.2 — Environmental Delta
| Environmental Effect | State A | State B | Status |
|---|---|---|---|
| Carbon displacement | Growing Superfund landfill; continued sludge incineration | ACM is designed to displace ~480,000 tCO₂e/yr at Phase Expanded EST | ESTIMATED |
| Landfill methane generation | ~1.2M tCO₂e/yr (Broadrock Renewables partial capture) | 396,000 TPY diverted at Phase Expanded — designed to reduce landfill intake by 44% EST | ESTIMATED |
| Superfund exposure | Each ton landfilled extends NPL closure monitoring obligation | Diversion reduces new landfill inputs; no new Superfund exposure from ACM manufacturing | — |
| Water recovery | No ultrapure water production | ACM designed to recover ~2,400,000 gal/day ultrapure water at Phase Expanded EST | ESTIMATED |
| Landfill life extension | Central Landfill ~2046 at current rates | Phase Expanded diversion: +15+ years additional life EST | ESTIMATED |
§5.3 — PFAS Structural Delta
In State A, wastewater biosolids containing per- and polyfluoroalkyl substances (PFAS) are landfilled or incinerated at sub-optimal temperatures that may not fully destroy PFAS compounds. Rhode Island's Narragansett Bay and local groundwater are designated sensitive water bodies with ongoing PFAS monitoring requirements. In State B, ACM's MCR process achieves 1,200°C+ localized temperatures within microwave susceptor hot spots inside the closed-loop anoxic reactor — designed to destroy PFAS compounds in the biosolids and IRA feedstock streams without generating PFAS-containing emissions (the closed Atmospheric Protection System captures all process vapors). ACM is classified NAICS 335991/325120/331410 (manufacturing), operates under manufacturing facility permitting, and is not subject to Rhode Island's WTE combustion prohibition — which targets NAICS 562213 combustion facilities. ACM's PFAS destruction capability is subject to post-operational validation.
§5.4 — No-Fallback Analysis
In the absence of ACM deployment, Rhode Island's contingency options for the post-2027 sludge crisis are: (a) rail haul to out-of-state landfills at $89–100/ton; (b) out-of-state truck haul at $160+/ton (West Warwick model); (c) regional incinerator development — precluded by the WTE combustion prohibition (note: ACM's MCR process is not an incinerator and is not prohibited — it is a manufacturing facility classified NAICS 335991/325120/331410, not NAICS 562213); or (d) NBC acquisition of Woonsocket TCF for recapitalization at $40–50M with no assurance of resolved odor/compliance issues. None of these options provide a Circular Royalty or gross cost displacement. All carry higher per-ton costs than the locked TMC Fee of $100/ton. The no-fallback analysis confirms that State B is the only identified pathway that simultaneously resolves the 2027 crisis, avoids out-of-state disposal cost escalation, and generates a net positive fiscal return.
§6 — Risk and Sensitivity
§6.1 — Risk Register
| Risk | Driver | Who Bears | Mitigation | Residual |
|---|---|---|---|---|
| FWDC verification divergence | Modeled FWDC ≠ verified rates | State (affects gross displacement) | Feasibility Study confirms rates; $100 TMC floor unchanged | Low — floor insulates |
| Timeline slippage — 2027 miss | Permitting or procurement delay | State (sludge cost), Carbotura (revenue) | Q2 2026 authorization; P1 co-location reduces complexity | Med — each month adds ~$0.5M incremental sludge cost |
| ACM technology performance | Conversion efficiency | Carbotura (BOO structure) | BOO; Carbotura owns capital; liquidated damages in COA | Low for State |
| Feedstock volume variability (+/−20%) | Diversion programs, recycling rates | Partial (volume risk) | MSW stream statutory; Phase Initial well below stream total | Low — see §6.2 |
| NBC/Woonsocket NBC acquisition | NBC acquires Woonsocket; delays urgency | State — reduced sludge urgency | MSW stream sufficient for Phase Initial without sludge | Low |
| Royalty escalator underperformance | Royalty rate below +1pp/yr | State — lower royalty | TMC floor ensures gross displacement regardless of royalty | Low-Med — see §6.4 |
| Site access failure (P1) | RIRRC declines site agreement | Shared — delays deployment | P2 (ProvPort) and P3 (Quonset) identified; no single-site dependency | Med — adds 6–12 months |
| PFAS regulatory tightening | Federal PFAS standards for biosolids | Shared | ACM designed for PFAS destruction; strengthens State B case | Low — risk improves State B position |
| WTE combustion prohibition amended | RI General Assembly legislates combustion-WTE exception | State — competitive risk (not ACM risk) | Any new combustion WTE facility: 10–12 years permitting/construction; no near-term competitive effect. ACM is already in the non-combustion manufacturing category regardless of WTE law status. | None for ACM — ACM's classification is independent of WTE law |
| Federal grant unavailability | Conservative 15% grant not secured | Carbotura — capital structure | BOO structure; State has $0 capital obligation regardless of Carbotura financing mix | None for State |
§6.2 — Feedstock Variability ±20%
Base Case — 132,000 TPY
+$2.31M
Year 2 net annual (Phase Initial)
−20% Volume — 105,600 TPY
+$1.85M
Year 2 net; fiscal position remains positive
+20% Volume — 158,400 TPY
+$2.77M
Year 2 net; upside from additional throughput
At −20% feedstock volume, the fiscal position remains clearly positive from Year 2. The statutory RIRRC delivery mandate for MSW makes significant volume reduction structurally unlikely for that stream. ESTIMATED
§6.3 — FWDC Sensitivity: Sign-Change Threshold
The sign-change threshold for Year 1 gross displacement is FWDC = $100/ton. At the current FWDC of $101.67/ton, gross displacement is +$1.67/ton (State B Year 1 is fractionally better than State A). The fiscal position never becomes adverse because: (a) from Year 2 onward, Royalty ($120/ton) exceeds TMC ($102.50/ton) unconditionally; and (b) the $100/ton TMC floor means the TMC Fee cannot exceed $100/ton regardless of FWDC movement below $100. The royalty crossover at Month 13 creates an unconditional net positive position from Year 2 that is independent of FWDC.
FWDC = $85/ton
−$15/ton
Year 1 gross (TMC floor $100 governs); Year 2 net = +$17.50 regardless
FWDC = $101.67/ton
+$1.67/ton
Base case · MODELED · Year 2 net = +$17.50
FWDC = $120/ton
+$15.00/ton
If verified higher; formula governs TMC; Year 2 net grows further
§6.4 — Royalty Escalator Sensitivity
| Escalator Scenario | Year 2 Net/ton | Year 10 Net/ton | Year 30 Net/ton | 30-yr Net — Phase Initial |
|---|---|---|---|---|
| 0 pp/yr (no escalation above base 120%) | +$17.50 | +$22.88 | +$40.67 | ~$85M EST |
| +1 pp/yr — LOCKED BASE CASE | +$17.50 | +$27.95 | +$91.21 | ~$153M EST |
| +2 pp/yr (upside scenario) | +$17.50 | +$32.82 | +$149.41 | ~$240M EST |
§6.5 — Timeline Slippage Sensitivity
| T0 Scenario | Phase Initial COD | First Royalty | Sludge Exposure Pre-COD |
|---|---|---|---|
| On-time: T0 = Q2 2026 | ~Q2 2028 | ~Q3 2029 | Pre-COD sludge: ~12 months at $160+/ton est. |
| 6-month slip: T0 = Q4 2026 | ~Q4 2028 | ~Q1 2030 | Additional ~$3M sludge exposure EST |
| 12-month slip: T0 = Q2 2027 | ~Q2 2029 | ~Q3 2030 | Additional ~$6M sludge exposure EST |
| 24-month slip: T0 = Q2 2028 | ~Q2 2030 | ~Q3 2031 | Full 2027–2030 sludge crisis unresolved; ~$18M+ incremental cost EST |
§7 — Decision Window Analysis
§7.1 — Binding Constraints
- Synagro Technologies contract expiry: 2027. This is a contractually fixed date. City of Woonsocket has voted unanimously to close the incinerator. Over 30 municipalities face sludge displacement with no contracted alternative.
- No in-state combustion alternative. Rhode Island statute prohibits WTE incineration (NAICS 562213) for MSW. No combustion-based incinerator can be developed within the 2027 constraint window. ACM's MCR process is not a combustion facility and is not constrained by this prohibition — it is the only identified non-combustion, non-landfill pathway that resolves the 2027 crisis within the available timeline.
- 10–12 year alternative system timeline. RIRRC's own planning studies confirm any replacement infrastructure requires 10–12 years. At T0 = Q2 2026, a conventional infrastructure replacement would not be operational until 2036 at earliest.
- Carbotura standard deployment schedule: 24 months to Phase Initial COD. This is the shortest available pathway to new capacity.
§7.2 — Decision Window Table
| Decision | No Later Than | Consequence of Delay Past Date |
|---|---|---|
| Authorize Community Feasibility Study | Q2 2026 | Misses pre-2027 COD; municipalities face ~$89–160+/ton sludge displacement from 2027 onward |
| Complete Feasibility Study + site designation | Q3 2026 | Construction start delayed; COD slips |
| Execute COA + construction start | Q4 2026 | Each quarter of delay adds ~$1.5M incremental sludge displacement cost EST |
| Phase Initial COD | ~Q2 2028 | State B fully operational; sludge crisis resolved; TMC obligations begin |
§7.3 — Irreversibility Mechanism
Irreversibility Finding
The irreversible event is the expiry of the Synagro Technologies processing contract at the Woonsocket Thermal Conversion Facility in 2027, combined with the City of Woonsocket's unanimous Council vote to close the facility. Once the 2027 threshold passes without an alternative in place, Rhode Island municipalities will have committed to multi-year out-of-state disposal contracts — at $89–160+/ton — that may themselves carry 3–5 year terms. Each year of delay not only incurs direct additional costs but locks in out-of-state disposal commitments that reduce the available feedstock for Phase Initial. The window in which ACM can resolve the 2027 crisis before it converts into a permanent structural cost is open now — and closes at the Q2 2026 procurement decision point.
§7.4 — Optionality Matrix
| Option | Cost/ton | Generates Royalty? | Resolves 2027? | Status |
|---|---|---|---|---|
| Continue State A (landfill + Woonsocket) | $101.67/ton blended | No | No — expires 2027 | Baseline; fails at 2027 |
| Rail haul out-of-state | $89–100/ton | No | Partially (MSW only) | No royalty; higher than TMC floor |
| NBC acquires Woonsocket TCF | $40–50M capex + ongoing | No | Possibly (sludge only) | Capital required; odor issues unresolved |
| New WTE facility | Not applicable | No | No — prohibited by RI law | Legally unavailable |
| ACM — Carbotura COA | $100/ton TMC | Yes — from Month 13 | Yes — COD ~Q2 2028 | Only option generating community return |
§8 — Net Effects Summary
No new figures. All values trace to preceding sections.
§8.1 — Fiscal Net Effects Table
| Effect | Year 1 (Pre-Royalty) | Year 2+ (With Royalty) | Year 30 Steady State |
|---|---|---|---|
| Per-ton gross displacement | +$1.67/ton MOD | Growing | +$43.45/ton EST |
| Per-ton net (displacement + royalty) | −$100.00/ton (pre-royalty) | +$17.50/ton → growing | +$91.21/ton EST |
| Annual net — Phase Initial | −$13.20M | +$2.31M | +$12.04M EST |
| Annual net — Phase Expanded | — | — | +$36.12M EST |
| 30-year cumulative net — Phase Initial | ~$153M EST | ||
| 30-year cumulative net — Phase Expanded | ~$460M EST | ||
| State capital obligation (all phases) | $0 | $0 | $0 |
§8.2 — Regional Economic Net Effects
The figures below represent regional economic activity. They are not direct county fiscal receipts and must not be combined with the fiscal net effects above.
| Effect | Phase Initial | Phase Expanded | Status |
|---|---|---|---|
| Net new direct employment | +120 FTE | +360 FTE | ESTIMATED |
| Net new indirect employment | +360 jobs | +1,080 jobs | ESTIMATED |
| Annual regional economic impact | ~$28M/yr | ~$84M/yr | ESTIMATED |
§8.3 — Environmental Net Effects
Environmental effects are stated on a designed-performance basis. Actual performance subject to commissioning validation.
| Effect | Phase Expanded | Status |
|---|---|---|
| Carbon displacement (designed) | ~480,000 tCO₂e/yr | ESTIMATED |
| Landfill life extension | +15+ years | ESTIMATED |
| Annual feedstock diverted from Central Landfill | 396,000 TPY (44% of identified) | ESTIMATED |
| Ultrapure water recovered (designed) | ~2,400,000 gal/day | ESTIMATED |
| PFAS structural improvement | MCR achieves 1,200°C+ localized anoxic hot spots — designed to destroy PFAS without releasing PFAS-containing emissions; closed-loop APS captures all process vapors | Designed basis; Exhibit B CBI, Carbotura EPA RCRA petition, Feb. 2026 |
§8.4 — Structural Net Effects
- State A's 2027 structural failure (Woonsocket sludge capacity exit) is resolved in State B by Phase Initial COD ~Q2 2028 — before the full crisis propagates to out-of-state disposal routes.
- Rhode Island's WTE combustion prohibition (NAICS 562213) has constrained the state's waste system for four decades. ACM's MCR process — classified NAICS 335991/325120/331410 (manufacturing), operating in a closed anoxic oxygen-free environment with zero combustion — is not subject to the prohibition. An EPA RCRA Solid Waste Exclusion Petition (filed February 20, 2026) establishes the federal manufacturing classification basis. RIDEM reviews ACM as a manufacturing facility permit. The prohibition that blocked every prior alternative does not apply to State B.
- Rhode Island's statutory RIRRC delivery mandate creates a built-in feedstock security mechanism for the MSW stream that has no equivalent in any other Carbotura engagement.
- The Central Landfill's Superfund status is not eliminated by ACM, but its trajectory is substantially altered: 44% feedstock diversion at Phase Expanded significantly extends remaining capacity and reduces the rate of monitored pollutant accumulation.
§8.5 — Unresolved Data Gaps
| Data Gap | Affecting Section | Resolution Pathway | Status |
|---|---|---|---|
| FWDC verification — individual stream contracted rates | §4.1, §4.4, §6.3 | Community Feasibility Study; RIRRC and municipal disposal contract review | GAP |
| 2024 RIRRC actual MSW tonnage | §2.1 | RIRRC Annual Report (expected April 2025 publication) | GAP |
| NBC + distributed WWTP sludge TPY (verified) | §2.1 | RIDEM surface water protection office; NBC sludge management plan | GAP |
| Coal ash disposal contract volumes at RIRRC | §2.1 | RIDEM inactive site inventory; responsible party disclosure | GAP |
| P1 site acreage and site agreement feasibility | §3.5 | RIRRC site agreement negotiation during Feasibility Study | GAP |
| T0 confirmation by RI state authority | §3.5, §6.5 | Community Feasibility Study authorization vote | GAP |
Appendix A — Sources and Methodology
- FWDC derivation ($101.67/ton MODELED): Blended from RIRRC FY2023 municipal tipping fee ($54/ton verified), estimated commercial rate (~$125/ton), West Warwick sludge disposal ($160+/ton verified; RI Current Feb 2026), and estimated ash/coal ash rates. Full derivation in Waste Study §3.3.
- TMC Fee formula: MAX($100, MIN($150, FWDC−$5)) = $100 (floor governs; FWDC−$5=$96.67 < $100). Carbotura standard parameters. Locked per Proposal EIR Input Block.
- Phase sizing: 400/800/1,200 TPD as specified by authorized user. Module math: ceil(TPD/100). Operating days: 330/year. CapEx: $75M + $57.5M/additional 100 TPD.
- Royalty formula: Royalty(m+13) = TMC(m) × Rate(m). Base 120% Year 1; +1pp/yr. 13-month lag. Carbotura standard defaults locked per MI v3.0.
- Environmental performance (designed basis): Carbon displacement, water recovery, PFAS destruction — Carbotura standard parameters scaled to Phase Expanded. Subject to commissioning validation. Not independently audited.
- Employment: Carbotura standard parameters; 120 direct FTE per 400 TPD module; 3× indirect multiplier. ESTIMATED.
- Timeline: Carbotura standard deployment schedule. T0 assumed January 2026.
- State A cost escalation rate (3%/yr): Conservative estimate based on documented RIRRC tipping fee trajectory (FY2015–2023 ~7% CAGR; forward projection conservative at 3%).
Appendix B — Glossary Additions
- Delta Model
- A comparative analytical framework that quantifies the difference between two defined system states (State A and State B). The EIR is a delta model: it does not independently assess either state but measures the change produced by substituting State B for State A at locked parameters.
- Gross Cost Displacement
- The annual reduction in disposal cost resulting from substituting the TMC Fee for the State A FWDC. In Year 1 at Phase Initial: ($101.67 − $100.00) × 132,000 TPY = +$220K. Quantified separately from Circular Royalty cash flow. Gross cost displacement does not include royalty income.
- Net County Fiscal Position
- The sum of gross cost displacement plus Circular Royalty receipts, minus TMC Fee obligations. Year 1: −$100/ton (pre-royalty; TMC only). Year 2: +$17.50/ton (royalty $120 − TMC $102.50). Year 30: +$91.21/ton. 30-year cumulative Phase Initial: ~$153M.
- Pre-Royalty Period
- The 12-month period following first feedstock delivery during which TMC Fee is paid and no Circular Royalty is received. The pre-royalty period ends precisely in Month 13 when the first rolling royalty payment arrives. The pre-royalty period must never be combined with post-royalty periods in any fiscal summary table.
- Royalty Ramp Period
- The period from Month 13 to approximately Month 24, during which Circular Royalty payments begin arriving on a rolling basis. During this period, the monthly royalty accumulates toward full run-rate as successive months' TMC payments (each 13 months earlier) generate their corresponding royalty disbursements.
- Steady-State Period
- The period from approximately Year 2 onward, when Circular Royalty payments are running at full run-rate (each month's TMC generating royalty 13 months later). During steady state, the Circular Royalty systematically exceeds the TMC Fee on a per-ton basis due to the base rate of 120% and the +1pp/year escalator compounding over the TMC's 2.5%/year escalator.
- State A / State B
- State A: Rhode Island's current waste management system as documented in the Waste Study. State B: The ACM deployment configuration as defined in the Proposal EIR Input Block. The EIR quantifies only the delta — it does not independently characterize either state.
- US GAAP
- United States Generally Accepted Accounting Principles. All financial figures in this EIR are presented on a US GAAP basis, as Rhode Island is a US jurisdiction. Applicable standards: GASB (Governmental Accounting Standards Board) for state and quasi-public entity financial reporting.
Appendix C — Evidence Chain
| Figure | Value | Public Source | Source Type |
|---|---|---|---|
| FWDC blended | $101.67/ton | Carbotura derivation; RIRRC FY2023 guide; RI Current Feb 2026 | MODELED |
| TMC Fee Year 1 | $100/ton | Carbotura registry lock; Proposal EIR Input Block | LOCKED |
| Royalty Year 2 | $120/ton | Formula: 120% × $100 TMC Year 1 | LOCKED |
| 2027 Synagro contract expiry | 2027 | Valley Breeze (March 2026); RI Current (Sept 2025) | VERIFIED |
| WTE prohibition | Statutory | ecoRI.org (April 2025) | VERIFIED |
| Rail haul cost | $89–100/ton | RIRRC 2018 Long-Range Study | VERIFIED |
| West Warwick sludge disposal | $160+/ton; 7,500 TPY | RI Current (February 2026) | VERIFIED |
| Landfill capacity projection | ~2046 | RIRRC via NBC10 (March 2025) | ESTIMATED |
| CapEx formula | $75M + $57.5M/module | Carbotura standard parameters | LOCKED |
| 30-yr cumulative net Phase Initial | ~$153M | Derived; all inputs above | ESTIMATED |