NYSDEC's Part 375 Overhaul: What Changed and Why It Matters for Long Island
The New York State Department of Environmental Conservation has finalized comprehensive amendments to 6 NYCRR Part 375, governing New York's Brownfield Cleanup Program (BCP), Voluntary Cleanup Program (VCP), and Environmental Restoration Program (ERP). These amendments are the most significant revision to New York's brownfield regulatory framework since the program's inception — and they carry immediate, material consequences for real estate developers, industrial companies, lenders, and property owners across Long Island's active brownfield market.
The revised Part 375 regulations apply to all new BCP and VCP applications and to pending cleanups that have not yet received a Certificate of Completion (COC). Companies with active cleanup programs may need to substantially revise their remedial investigation scopes, remedial action plans, and institutional control strategies. Acting quickly to understand how the amendments apply to your specific project is essential to avoiding costly schedule delays and unexpected remediation expenses.
Mandatory Vapor Intrusion Investigation: The Most Significant New Requirement
The most operationally significant change in the revised Part 375 regulations is the mandatory vapor intrusion investigation protocol now required at all BCP and VCP sites where volatile organic compounds (VOCs) are detected in soil or groundwater above updated screening levels. Previously, vapor intrusion investigations were discretionary. Under the amended regulations, any site with trichloroethylene (TCE), perchloroethylene (PCE), benzene, or other common industrial solvents above new screening levels must complete a comprehensive vapor intrusion assessment — including soil gas sampling and indoor air monitoring — before NYSDEC will approve a Remedial Action Plan.
For Long Island's industrial corridor — encompassing former dry cleaning operations, metal finishing facilities, electronics manufacturers, and machine shops in Hauppauge, Melville, Ronkonkoma, Bethpage, and Garden City — this requirement adds a mandatory new work scope element to virtually every BCP and VCP project. Developers and sellers of industrial properties should budget for vapor intrusion assessment from earliest project planning stages.
Updated Soil Cleanup Objectives: Lower Standards Mean Higher Costs
The revised regulations establish new Soil Cleanup Objectives (SCOs) for over 200 contaminants, incorporating updated EPA toxicity values and exposure assumptions. Several SCOs relevant to Long Island's industrial sectors have been significantly lowered — including standards for polycyclic aromatic hydrocarbons (PAHs), hexavalent chromium, and certain chlorinated solvents.
The practical impact is direct: soils that previously met Part 375 SCOs may no longer satisfy cleanup requirements. Developers with active BCP or VCP projects should immediately compare existing Remedial Investigation data against the new SCOs to determine whether additional investigation or remediation is required before a COC can be issued. Sellers of contaminated Long Island industrial properties should assess how the revised SCOs affect their cleanup obligations and purchase price representations.
Institutional Controls and Long-Term Property Management
The revised Part 375 regulations expand the scope of institutional controls — deed restrictions, environmental easements, and groundwater use restrictions — required as a COC condition for sites cleaned to commercial or restricted-residential use standards. New provisions require more detailed engineering control maintenance plans, enhanced financial assurance, and more rigorous five-year review certifications.
For Long Island industrial property owners and developers pursuing Brownfield Tax Credits under New York Tax Law Section 21, maintaining compliance with institutional control requirements throughout the credit eligibility period is essential. NYSDEC has authority to revoke Certificates of Completion — and associated tax credit eligibility — if institutional controls are not properly maintained.
Key Takeaways for Long Island Brownfield Developers and Property Owners
The amended Part 375 regulations raise the bar and the cost for brownfield cleanup in New York. Long Island developers, industrial property sellers, and their lenders should immediately review active environmental programs against the new SCOs and vapor intrusion requirements. Engaging experienced New York environmental counsel early in the project lifecycle — not after receiving NYSDEC comments — is the most cost-effective strategy.
Rigano LLC guides Long Island developers, lenders, industrial property owners, and sellers through New York's Brownfield Cleanup Program from site entry through Certificate of Completion, with deep expertise in NYSDEC's revised Part 375 regulations. Contact our Long Island environmental law office to discuss how the amendments affect your project.