SWMU 4, Davis Landfill CERCLA Landfill Site
Background
SWMU 4 is the site of a former 3.91-acres landfill that was operated from the early to late 1940s. It is believed to have been closed with a soil and rock cover in the late 1940s. The former landfill is on the eastern shore of Andrew Lake, about 3 miles north of downtown. It is believed to be filled with construction debris and waste generated by the construction and subsequent demolition of Albert Mitchell Airfield, which used to occupy the area between Andrew Lake and Clam Lagoon. Site features generally consist of a flat rocky surface, with a small stream, some wet depressions, and various grasses (US Navy 1995c). The vegetative soil cover was placed on the site in 1999.
The remedial action objectives for SWMU 4 are to protect human or ecological receptors (or both) from exposure to landfill debris and subsurface soil. Maintaining the integrity of the soil cover will help ensure the site remains protective.
Landfill Institutional Controls
ICs at the landfills complement previous actions taken, such as installation of groundwater monitoring systems, and the placement of soil cover. The ICs will minimize potential human exposure to site chemicals by implementing land use restrictions and imposing restrictions on soil excavations.
To ensure the integrity of the landfill covers, containment, and monitoring systems currently in place, the future landowner(s) and/or user(s) will be prohibited from performing activities that will disturb the soil cover or monitoring systems or impact the drainage and erosion controls developed to protect the soil cover.
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Groundwater Restrictions
Domestic use of groundwater in the Downtown Area is restricted because of the potential presence of petroleum compounds and other chemicals in the groundwater. Domestic groundwater use is defined as that used by households or transients for human and animal consumption, cooking, bathing, showering, gardening, irrigation, or use on consumable food products, watering animals and any other domestic use. The excavation notification program at individual sites provides one barrier to drilling; enforcement of the prohibition will also occur through periodic visual inspections. The visual inspections will focus on unauthorized wells in the restricted area. Groundwater use restrictions are included in the equitable servitude.
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Inspections and Reporting
The ICs identified in this plan will be inspected and reported on an annual basis, or as necessary. Signs will be inspected for wear and tear, and replaced as necessary. The annual reports will assess the need for more or less inspection requirements, as well as determine whether the ICs in place are effective. The annual reporting requirements will be included in CERCLA 5-year reviews.
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Land Use Restrictions
The landfills may be used for recreational use or any other activity that does not adversely impact the integrity of the landfill covers, containment, or monitoring systems. Examples of acceptable recreational uses include hiking, bird watching, hunting, nature watching, or any other short-term, non-intrusive activity.
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Soil Excavation Restrictions
Landfill excavation by non-Navy personnel is absolutely prohibited. Excavation for the purpose of digging a domestic groundwater use well is also prohibited. Recreational land uses that add additional cover (e.g. ball fields, golf course) may be permissible. Navy personnel will be allowed to excavate for the purposes of repairing caps, etc.
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Landfills Engineering Controls
The following engineering control, as stipulated in the OU A ROD, is required at landfill sites.
Sign and Soil Cover Maintenance
Signs and soil cover are in place at the landfills. The signs and soil cover will be inspected annually, or as necessary, to ensure that the signs are legible, and that the soil cover remains in place.
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