Brownfield Redevelopment

What makes a property a brownfield?

A brownfield is not limited to a heavily contaminated industrial parcel. Former gas stations, dry cleaners, manufacturing sites, rail yards, warehouses, auto repair facilities, and vacant commercial parcels may qualify when environmental concerns complicate reuse. Sometimes contamination is confirmed; sometimes historic operations, incomplete records, or nearby releases create the uncertainty.

The practical question is whether the property can be reused safely, lawfully, and economically. A cleanup estimate alone will not answer it. Buyers and developers also need to understand the extent of contamination, the agency overseeing the work, the proposed land use, possible restrictions, and the remaining risk lenders or investors will accept.

Investigation and cleanup must fit the proposed use

Environmental due diligence commonly begins with a Phase I environmental site assessment. Identified concerns may warrant sampling through a Phase II assessment. Sampling can help evaluate contaminated soil, groundwater, and soil vapor, but technical results do not by themselves establish who must pay for cleanup.

Some sites can proceed with limited sampling and construction controls. Others require a remedial action plan, vapor mitigation, groundwater monitoring, a soil management plan, land use restrictions, or phased construction. A remedy suitable for industrial use may need further evaluation, remediation, or controls before residential, school, or child-care use.

The California Environmental Due Diligence Checklist identifies issues to discuss before committing to a purchase or redevelopment plan.

Which California agencies may be involved?

The Department of Toxic Substances Control (DTSC) may oversee hazardous substance cleanup. Regional Water Boards may oversee cleanup and impacts to water quality, while local agencies may oversee underground storage tank and other cleanup cases. Cities and counties control land use approvals. Identify these roles early to avoid conflicting assumptions about approval or closure.

A redevelopment requiring discretionary public approval may also need CEQA review. Soil export, truck traffic, dewatering, construction emissions, and vapor mitigation can become part of that review.

EnviroStor and GeoTracker are useful starting points. Compare database information and agency letters with the actual property boundaries, historic uses, regional conditions, and proposed redevelopment. A database entry or an old closure letter is not a substitute for site-specific review.

Address cleanup responsibility before closing

Brownfield conditions can affect purchase price, financing, closing conditions, insurance, construction timing, and future sale. Environmental reports, agency correspondence, access agreements, indemnities, and disclosure materials should tell a consistent story about what has been investigated and what remains unresolved.

Agreements may need to address a remedial action plan, soil management plan, land use covenant, indemnification, or deed restriction. Identify who will perform and pay for the work, the applicable standard, deadlines, and responsibility for later changes in site use or regulatory requirements. Private agreements can allocate costs between parties without eliminating liability to regulators.

Integrating environmental work into deal terms and project design can reduce the chance of discovering cleanup constraints after schedules and financing are committed. See our environmental guidance for California development and redevelopment.

Questions about brownfield redevelopment