Experts and advocates urge ban or strict limits on coal‑tar sealants to reduce PAH pollution
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Summary
Environmental witnesses backed HB 16 14 to restrict coal‑tar pavement sealants because they release high levels of carcinogenic PAHs into dust and waterways; speakers recommended a 1,000 ppm PAH threshold and noted affordable asphalt alternatives.
Representative Lisonbee Knabb opened HB 16 14, outlining scientific and public‑health concerns about polycyclic aromatic hydrocarbons (PAHs) in coal‑tar based sealants used on parking lots and driveways. Environmental scientist Steve Greeson, who worked on an EPA grant to certify PAH content in pavement sealers, told the committee coal‑tar sealants commonly measure tens of thousands of parts per million PAHs and wash into stormwater and sediments. He recommended a protective threshold of 1,000 ppm and said high‑performance asphalt alternatives are available at comparable cost and using the same application equipment.
Melissa Paley of the Conservation Law Foundation (Great Bay Piscataqua Waterkeeper) cited New Hampshire Department of Environmental Services 303(d) lists showing PAH impairments and urged the committee to adopt the tighter 1,000 ppm standard to prevent manufacturers from substituting high‑PAH alternative formulations. Andrea Lamoreaux of New Hampshire Lakes stressed the persistence of PAHs in lake sediments and long‑term risks to aquatic life.
Industry and lobby material sent to the committee was noted; speakers characterized some industry arguments as selective and recommended relying on peer‑reviewed monitoring and the certification program referenced by the sponsor. Committee members requested evidence and datasets; witnesses offered to provide the studies and EPA/Des materials. The public hearing closed with committee attention on whether to amend the bill to a 1,000 ppm limit and to tighten exemptions.
