Site Summary ProfileEPA ID: FLD084535442
Location: North Miami, Miami-Dade County, FL
Lat/Long: 25.908330, -080.154160
Congressional District: 22
NPL Status: Proposed: 12/30/82; Final: 09/08/83; Deleted: 09/24/99
Affected Media: Ground water
Cleanup Status: Deleted from the NPL
Human Exposure Under Control: Yes
Groundwater Migration Under Control: NA
Sitewide Ready for Anticipated Use: Yes
Site Reuse/Redevelopment: In reuse – a mixed-use, master-planned community with commercial office and retail, residential, hotel, and recreational land uses is located on site
Site Manager: Brad Jackson (firstname.lastname@example.org)
Current Site Status
The Munsiport Landfill site includes the area where a former municipal landfill operated from 1974 to 1981. EPA placed the site on the National Priorities List (NPL) in 1989 because of contaminated ground water resulting from the landfill. EPA, the Florida Department of Environmental Protection (FDEP) and the City of North Miami, the site’s potentially responsible party (PRP), have investigated site conditions and taken steps to clean up the site in order to protect people and the environment from contamination. Studies completed in the late 1980s found that while landfill contamination did not potentially threaten people living on or near the site, the site did pose a significant threat to aquatic organisms (e.g., plants and animals) in wetlands next to the site. Cleanup has addressed the threat to aquatic organisms. By addressing ground water contamination and closing the landfill, EPA, FDEP and the site’s PRP continue to protect people and the environment from site contamination.
The site is a 170-acre former municipal landfill located in the center of North Miami, a city situated between Miami and Fort Lauderdale in southeastern Florida. The landfill is part of a larger 291-acre parcel of land formerly planned to be part of a trade and cultural center and, later, a recreation center. The 291-acre parcel includes the 170-acre landfill, a 15-acre upland area, a 93-acre altered wetland and a 13-acre wetland next to Biscayne Bay. The 291-acre parcel borders a post office and retail businesses to the west, 151st Street to the north, and residential areas, including a mobile home park, to the south. Florida International University borders the site to the northeast. Biscayne Bay is located east of the site and includes a State of Florida mangrove preserve. The City of North Miami owns the site.
Part of the landfill is now Biscayne Landing, a mixed-used, master-planned residential and commercial development. Redevelopment also included the construction of a school on part of the site next to the landfill after EPA completed site cleanup work.
The site is the location of a former municipal landfill that operated from 1974 to 1981. The landfill filled in low-lying wetland areas with construction debris and solid waste in an effort to raise the area’s elevation for the construction of a trade and cultural center known as Interama. The landfill disposed of the solid waste without the use of a liner or leachate control mechanisms, which control water that collects contaminants as it passes through contaminated material. Rainfall moving slowly through the solid waste caused the release of contaminants into underlying ground water as well as nearby surface water. EPA completed a remedial investigation in 1988 and a water quality and toxicity assessment in 1989 and found that while landfill contamination did not potentially threaten people living on or near the site, the site did pose a significant threat to aquatic organisms (e.g., plants and animals) in the wetlands next to the site. EPA listed the site on the NPL in 1983.
Site investigations initially identified contamination in ground water that could potentially harm people in the area. Ground water contamination resulted from the leaching of landfill material. Contaminants of concern identified included neutral acids, inorganic compounds, heavy metals, polycyclic aromatic hydrocarbons (PAHs), pesticides and volatile organic compounds (VOCs). These are the same types of contaminants commonly found at other solid waste landfills. Studies later conducted by EPA determined that the site does not pose a threat to people living on or near the site. EPA determined that ground water contamination was not an immediate concern because the ground water was already unusable due to saltwater intrusion. EPA did identify significant threats, caused primarily by ammonia, to aquatic organisms in the wetlands next to the site. EPA addressed these threats.
The site’s PRP is addressing ground water contamination and the closure of the landfill in accordance with state regulations. As part of the landfill closure process, the PRP must make sure the landfill will no longer potentially threaten people, plants or animals.
Investigation and Cleanup Responsibility / Oversight
The PRP, the City of North Miami, led site investigation and cleanup activities, with oversight provided by EPA and FDEP.
Site Cleanup Plan
In 1990, EPA issued a cleanup plan (a Record of Decision, or ROD) for the site. The plan included the following activities:
- Implementing a hydraulic barrier – a system of ground water wells – to collect contaminated ground water before it flowed from the landfill into the nearby mangrove preserve.
- Treating contaminated ground water using a process known as air stripping.
- Discharging treated ground water to the underlying aquifer.
Associated activities included the tidal restoration of a State of Florida mangrove preserve and a hydraulically altered wetland area. The overall goal of the cleanup plan was to reduce potential harm to aquatic organisms in the mangrove preserve resulting from elevated levels of ammonia caused by landfill leachate.
In 1997, EPA issued a ROD Amendment for the site (see the “Cleanup Progress” section).
EPA implemented the site cleanup plan in several phases: tidal restoration of the wetland area; construction of access and service roads; installation of hydraulic barrier recovery wells; and development of the ground water treatment and disposal system. EPA completed the tidal restoration of the wetland area, including the Biscayne Bay Aquatic Preserve and the State of Florida mangrove preserve, in 1995. EPA completed construction of access roads and recovery wells for the hydraulic barrier in 1996. The PRP submitted a draft design for the ground water treatment and disposal system to EPA in 1996. However, after extensive study of the changes in water quality and toxicity conditions in the mangrove preserve, EPA concluded that increased tidal circulation had eliminated the movement of contamination from the site into the preserve. As a result, EPA issued a ROD Amendment in 1997 stating “No Further Action” was necessary under Superfund to address site ground water. In 1999, EPA deleted the site from the NPL, indicating that all site cleanup was complete.
In 2004, Miami-Dade County provided funding to the City of North Miami to close the landfill and clean up underlying ground water contamination.
EPA negotiated legal agreements with the site PRP, the City of North Miami, to investigate and clean up the site. The PRP funded site cleanup activities and continues to fund monitoring and oversight activities.
EPA worked with the community and its state partner to develop a long-term cleanup plan for the site, reflecting the Agency’s commitment to safe, healthy communities and environmental protection. Community engagement and public outreach are core components of EPA program activities.
EPA conducted a range of community involvement activities to solicit community input and to make sure the public remains informed about site activities throughout the cleanup process. Outreach efforts have included public notices and information meetings on cleanup progress and activities.
During site investigations and cleanup planning in the late 1980s and early 1990s, community interest in the site was high. The Munisport Dump Coalition received two EPA Technical Assistance Grants. EPA worked regularly with this group. The group used the grants to hire local hydrogeology experts to participate in technical meetings and represent community interests and priorities. Nearby residents participated in the coalition.
Following the completion of cleanup activities under Superfund and the deletion of the site from the NPL, EPA does not require Five-Year Reviews for the site. The site’s status does not warrant further updates at this time.
EPA keeps additional site documents and information in a site information repository at the location below. EPA also posts site documents, when available, on EPA’s CERCLIS Site Profile page. For documents not available on the website, please contact the Region 4 Freedom of Information Office.
Florida International University Library
North East 151 Street & Biscayne Boulevard
North Miami, FL 33181