Accession Number:

ADA169534

Title:

Geohydrologic Summary for Herbicide Orange Sites at Eglin AFB, Florida and the the Naval Construction Battalion Center, Gulfport, Mississippi

Descriptive Note:

Final rpet. Apr 1984-Apr 1986

Corporate Author:

AIR FORCE ENGINEERING AND SERVICES CENTER TYNDALL AFB FL ENGINEERING AND SERVICES LAB

Report Date:

1986-05-01

Pagination or Media Count:

95.0

Abstract:

The geohydrologic conditions at Eglin Air Force Base EAFB, Florida, and the Naval Construction Battalion Center NCBC at Gulfport, Mississippi, have been evaluated to assess the potential impacts on the groundwater resulting from the contamination of surficial soils by storage and handling of military herbicides. The results from this evaluation are used to determine the likelihood of herbicide residues being transported in the shallow groundwater. A trace contaminant of one of the herbicides, 2,3,7,8-tetrachlorodibenzo-p-dioxin, is the constituent of greatest concern. A monitoring program is proposed for each of the military sites. Both sites are situated in the Gulf of Mexico Coastal Plain. The subsurface sediments are composed of quartz sand, clay, gravel, and silt. The permeable sands from aquifers, and the impermeable clays form aquicludes or confining beds. Horizontal permeabilities are much higher than vertical permeabilities. The water in the shallow aquifer at each site is soft and relatively unmineralized because of relatively insoluble quartz sand and high recharge from rainfall. Low pH and high iron concentrations are caused by the low buffering capacity of the aquifer materials. The monitoring systems proposed at each site will have one well upgradient and several wells downgradient. A monitoring plan for nearby surface waters is also recommended. The wells will sample the shallow groundwater flow system. The possibility of dioxin contaminants migrating to deeper zones is extremely remote at either site.

Subject Categories:

  • Geology, Geochemistry and Mineralogy
  • Hydrology, Limnology and Potamology
  • Water Pollution and Control

Distribution Statement:

APPROVED FOR PUBLIC RELEASE