247 A.3d 499
Vt.2020Background
- VTrans sought an Act 250 permit for a diverging diamond interchange at I-89 Exit 16 (Colchester), adding 1.2 acres of impervious surface and 0.38 lane miles (VTrans maintains 0.29 lane miles; Town of Colchester 0.09). Stormwater discharges to Sunnyside Brook and then Lake Champlain.
- Project will increase phosphorus and chloride runoff; DEC issued a stormwater discharge permit; Lake Champlain is impaired for phosphorus (TMDL in place); Sunnyside Brook is impaired for chloride (no watershed chloride TMDL yet).
- Experts disagreed on phosphorus increase and treatment: VTrans estimated +0.11 lb P/yr and ~40% removal via grass channels; Vallee estimated +1.62 lb P/yr and lower channel efficacy (~9%).
- Vallee’s chloride expert measured frequent exceedances of EPA chronic standard in Sunnyside Brook and estimated VTrans’ current annual salt use and an incremental ~3.3 tons/yr from the project (plus ~1 ton/yr for the Town).
- The Environmental Division conducted a multi-factor Criterion 1 analysis (nature & amount of pollutant, character of area, applicable regs, mitigation), found the phosphorus increase extremely small and mitigation adequate, found VTrans’ chloride management practices credible and ongoing reductions reasonable, and declined to join the Town as a co-applicant because VTrans effectively controls implementation via agreements and permit conditions.
Issues
| Issue | Plaintiff's Argument (Vallee) | Defendant's Argument (VTrans / State) | Held |
|---|---|---|---|
| Whether the court applied an improper de minimis standard for phosphorus under Act 250 Criterion 1 | Court impermissibly created a de minimis exception; any additional P to impaired Lake Champlain is undue | Criterion 1 is a fact-specific, multi-factor inquiry; amount is one factor, not a categorical bar | Court did not adopt a de minimis legal rule; used multi-factor test and properly weighed the small P increment in context; affirmed |
| Whether the court erred in evaluating phosphorus amount and mitigation | VTrans’ P estimate and mitigation efficacy understated; more mitigation required | VTrans’ stormwater design (grass channels) and DEC permit provide effective mitigation; Vallee did not quantify added measures’ benefits | Court found VTrans’ mitigation adequate; even Vallee’s higher estimate produced a tiny increase relative to Lake Champlain load; affirmed |
| Whether the court erred in finding chloride discharges not undue | Project adds significant chloride to an already impaired brook; court relied on permit presumption or shifted burden to Vallee | Court evaluated chloride on the merits; VTrans has Snow & Ice Control Plan and project Chloride Management Plan and evidence of reductions; safety limits some site measures | Court rejected presumption/burden-shift claims, credited VTrans’ plans and testimony, and held chloride discharge not unduly polluting; affirmed |
| Whether the Town of Colchester was a necessary co-applicant | Town controls part of the maintained lane miles and its chloride use is essential—joinder required | VTrans (state agency) can proceed and finance/maintenance agreement plus permit conditions ensure Town compliance | Court did not abuse discretion in denying joinder: VTrans effectively controls project and agreements/permit conditions bind performance; affirmed |
Key Cases Cited
- In re Diverging Diamond Interchange SW Permit, 218 A.3d 564 (Vt. 2019) (Criterion 1 is highly fact-specific; courts may consider nature and amount of pollution)
- In re N.E. Materials Grp., LLC, 217 A.3d 541 (Vt. 2019) (lists factors for Criterion 1 analysis including nature/amount and mitigation)
- In re Route 103 Quarry, 958 A.2d 694 (Vt. 2008) (deference to Environmental Division factual findings)
- In re Village Assocs. Act 250 Land Use Permit, 998 A.2d 712 (Vt. 2010) (Act 250 balances environmental protection with development needs)
- Conservation Law Found. v. Burke, 645 A.2d 495 (Vt. 1993) (distinguishable: forbids de minimis departures from regulatory emission limits in air-permit context)
- In re Pilgrim P’ship, 572 A.2d 909 (Vt. 1990) (District Commission has discretion to order joinder)
- Caledonian-Record Pub. Co. v. Vt. State Colls., 833 A.2d 1273 (Vt. 2003) (appellate courts may affirm on different reasoning when record supports the result)