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Specifications

Client

City of Gainesville

Description

Provided excavation and off-site disposal of more than 147,000 tons of contaminated soil

Location

Gainesville, Florida

Project Highlights

  • Contamination assessment
  • Human health & ecological risk assessment
  • Remedial investigation/feasibility study
  • Soil & sediment remediation
  • Park design & construction
  • Stormwater design engineering
  • Brownfield redevelopment

Located in the vicinity of Depot Avenue in downtown Gainesville, the Depot Park site consists of a 32-acre tract of land having several former landowners and sources of contamination (gas stations, cement plant, petroleum tank farms, manufactured gas plant, and others). ECT was initially awarded a contract to characterize the site, identify the various sources and extent of soil and groundwater contamination, perform a human health and ecological risk assessment, and subsequently prepare a remedial action plan and oversee cleanup of the site.

The final remedy included the excavation and off-site disposal of more than 147,000 tons of contaminated soil. Pumping at a rate of 300 gallons per minute (>432,000 gallons per day), 106 wells were used to dewater the area, with more than 40 million gallons of contaminated water being processed through sand filters and activated carbon prior to discharge into Sweetwater Branch.

ECT’s additional responsibilities included designs for restoration of the site into a contemporary greenspace for public outdoor enjoyment, complete with landscaping, cycling, walking, and jogging trails, and a museum. Unique to the design is the park’s capacity to treat stormwater runoff from approximately 89 acres of downtown Gainesville through a series of baffle boxes, forebays, wet detention ponds, a braided stream and wetlands. A stormwater harvesting system is also used to provide landscape irrigation for the park.

ECT was responsible for developing the pollutant loading and removal efficiencies for the overall system, permitting the site through various agencies, including Florida Department of Environmental Protection, St. Johns River Water Management District (SJRWMD), U.S. Army Corps of Engineers, and the City of Gainesville, and helping the city establish a credit bank system with SJRWMD to promote growth and development within the basin.