A discussion highlighted the plant’s production rates in July, which consistently exceeded 320 tons per hour, with peak days reaching 340 tons per hour. Notably, there were no complaints filed on any of the 11 high-production days or during the four occasions when the plant produced 2,000 tons or more of asphalt. This data suggested no direct correlation between high production rates and the frequency of odor complaints, contradicting initial concerns that higher production volumes would exacerbate odor issues.

The protocol for responding to complaints was explained, revealing that Keing typically contacts complainants unless they request otherwise. Additionally, Keing investigates the neighborhood for potential odor sources during weekly visits by the third-party consultant, Alliance. On July 26, despite multiple complaints, Alliance found no detectable off-site odors. Similarly, on July 2, despite an early complaint, no odors were detected upon investigation, and production was briefly halted to address the concern.

Alliance’s representative detailed their methodology for odor surveys, noting that observations are scheduled under conditions most likely to detect odors, avoiding high winds and rain. Detected odors were described with measurements below the threshold of concern. The July assessments showed minimal off-site odor detections and a reduction in complaints compared to previous months. The introduction of a new product, ecosorb, was credited for this improvement.

Despite these improvements, a board member suggested extending the monitoring period for an additional 90 days before considering lifting any restrictions. This cautious approach was shared by many, given the implications of lifting the order prematurely.

A resident raised concerns about the plant’s maximum production capacity, questioning the figures discussed and emphasizing the need for consistent data to accurately assess the situation. This highlighted the importance of understanding the maximum output of the facility in relation to the testing conducted.

Further complexity in measuring and understanding odors was illustrated by discussions about odor measurement tools and their thresholds. Comparisons were made between asphalt odors and less significant odors, like fresh-cut grass, to contextualize the significance of the reported readings.

In addition to the odor concerns, the meeting also focused on the plant’s compliance with the DEP air permit. The plant had recently undergone stack testing while operating at approximately 400 tons per hour, about 80% of its maximum capacity of 500 tons per hour. This testing was necessary to meet DEP permit requirements. It was noted that environmental factors, such as moisture content in aggregates, affect drying times and could impair product quality if production is pushed through the dryer too quickly.

A participant inquired about potential future contracts that might increase production closer to the plant’s maximum capacity. It was emphasized that consistent production rates are preferred to maintain product quality.

Discussions also touched on the DEP’s role in overseeing the plant’s operations. Transparency in reporting stack testing results and compliance documentation was stressed, with DEP’s on-site presence during testing and the availability of relevant paperwork as public records noted.

An audience member agreed with the board’s cautious approach regarding the potential rescinding of a cease and desist order. They highlighted how environmental conditions, such as wind patterns in the fall, could impact the surrounding community and urged the board to monitor the plant’s operations over a full season before making any decisions.

The board decided to extend the next meeting to December 3 to align with the end of the plant’s operational season. This timeline would allow for a more comprehensive assessment of the plant’s performance and environmental impact over a complete operational cycle.

Further discussions included updates on measures to mitigate environmental impacts, particularly concerning truck traffic and odors reported by residents. Non-compliant trucks have been turned away to ensure adherence to safety and environmental standards.

Additionally, a participant raised questions about the progress of a traffic study, clarifying that such matters fall under the jurisdiction of the Board of Selectmen rather than the Board of Health. A motion to continue discussions at the December meeting passed unanimously.