Sewage Treatment Plant

Projects: Brownfield Assessment & Redevelopment

Environmental Consulting

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Situation

A five-acre wooded municipal site was targeted for redevelopment. The plan: build a small sewage treatment plant to address the city’s sewage-overflow problem. The facility would hold three 1.5-million gallon tanks in which high-flow sewage would be held and/or treated on-site. This was a classic Brownfield. It had remained vacant since its municipal well was closed 20 years ago, its groundwater affected by an adjacent property under remediation.

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Results

ATC helped the client save approximately $260,000 in waste disposal costs by managing impacted materials on-site. Our concurrent plan of environmental and geotechnical drilling saved an additional $10,000 and ensured consistent and representative data collection. Further, we developed site-specific exposure models and associated human-health risk calculations to facilitate local on-site waste management. Among the payoffs: the development of engineering controls to mitigate exposure pathways. We implemented excavation and off-site disposition methods to remediate areas of environmental impact, primarily from residual 55-gallon drums, pesticides and paint waste. ATC continues to monitor construction and environmental impact and perform associated materials testing.