A prominent commercial realtor and developer were contracted to find suitable land in a desirable location for development of a charter school. Through the Phase I ESA process, APPLIED ENVIRONMENTAL identified that the subject property was part of a larger historical landfill. This information did not discourage the clients, and a Phase II ESA was conducted in order to define the nature and extent of the landfill. The subsurface investigation was very comprehensive, advancing approximately 80 Geoprobe borings, collecting soil samples at multiple depths within each boring, and collecting groundwater samples. Several metals and PNAs were detected throughout the subject property that exceeded the Residential and Commercial I – Part 201 Generic Cleanup Criteria & Screening Levels, including the Drinking Water Protection Criteria, Groundwater Surface Water Interface Protection Criteria, and Direct Contact Criteria. APPLIED ENVIRONMENTAL then conducted a soil gas survey, which did determine the presence of low levels of methane within the fill material. A Geotechnical Investigation was also completed in order to determine the suitability of the land for development.
A particularly challenging aspect of this project was the development of the Due Care Plan for the property, given its historical use as a landfill and the future use of the property as a charter school.
Due to the potential for increased public scrutiny over the chosen location, APPLIED ENVIRONMENTAL worked diligently in concert with MDEQ personnel to ensure the health and well being of future students. The final Due Care Plan, which was affirmed by the MDEQ for 20107a obligations, included attention to the following details:
Safety During Construction
- Perimeter monitoring for airborne contaminants
- Personal protective equipment - Level D
- Baseline Health Statistics for workers
- Real-time monitors to be worn by personnel working near the perimeter
- Storm water run-off routed into frac tanks, then tested for disposal
- Sediment control
- Fugitive dust control & perimeter monitoring of work area
- Passive ventilation system under building
- Construction of two raceways for utilities during first construction phase
- Sediment filter cloth at property boundaries in raceways
- Site capping, with building, asphalt, and clean fill/topsoil and sod for greenbelts
- Placement of 4” to 6” of clean fill beneath concrete floor of building
- Placement of 2” to 4” of imported clay beneath 4” to 6” topsoil in greenbelt areas
- Installation of landscape barrier cloth over foundry sand in landscape beds
- Engineering quality control verification of landfill cap construction, utility corridor construction, storm water catch basins and passive venting system
- Land use restriction that no organized sports will be conducted on-site
This Due Care Plan was affirmed for adequacy by the MDEQ for protecting human health at the subject site. The client was now able to confidently develop the site knowing that risks to human health were addressed and affirmed by the MDEQ.