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The former wash rack is located near the Transportation Shop (Building 2016) and was in use from the late 1970s until the closure of NASD in 2001. The area is a concrete driveway with 4-inch curbs on each side and ramps on each end, measuring approximately 20 feet long by 10 feet wide. The area was used primarily for cleaning Navy vehicles.
Facility personnel stated that degreasing solvents were occasionally used in this area to facilitate cleaning. Runoff was collected into an oil/water separator (OWS) that was located at the end of the driveway, before discharging into an open ditch that eventually discharges to the Atlantic Ocean. However, there is no apparent direct connection from the site to any continuously flowing water bodies on the island. The OWS was removed and properly disposed of before sampling was conducted in April 2000.
A total of 14 surface soil samples, 14 subsurface soil samples, and one groundwater sample were collected from the site. One monitoring well was also installed upgradient to this site (at a higher elevation, so groundwater from the site could not flow to the well) to serve as the background well for sites investigated within this area. The only chemicals detected at levels that could make them chemicals of potential concern (COPCs) at SWMU 14 were six metals (aluminum,arsenic, iron, manganese, thallium, and vanadium) in surface soils; three metals (aluminum, iron, and thallium) in subsurface soil; and manganese and dieldrin in groundwater.
The risk assessment of these COPCs found that possible future health effects are within acceptable limits for maintenance, industrial and construction workers; recreational visitors; and residents (if the area were developed as housing in the future). There is some slightly elevated hazard index (HI) associated with iron in soil for a hypothetical residential child. However, iron is commonly detected at similar concentrations across the former NASD at most sites, and iron concentrations at this site are lower than background soil levels; thus, the iron represents background conditions from the site soil and suspended particles in groundwater. A well upgradient of this site has higher metals concentrations than the well. Because SWMU 14 does not present ecological or human health hazard concerns, it was recommended for No Further Action.
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Investigation and Action:
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- Final Expanded PA/SI, 2000.
- Phase I RFI. Interim action: fenced off the landfill’s southern boundary for public safety.
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Site Status |
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No Further Action recommended (May 2003).
- EQB concurred with the No Further Action recommendation (February 2007)
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Current Land Use |
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