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The overall objective of the Phase II investigation is to define the magnitude, extent, direction and rate of movement of identified contaminants. A series of staged field investigations may be required to meet this objective. The contractor shall recommend any additional investigations required beyond this stage (Stage 2), including an estimate of costs. The purpose of this task is to undertake a field investigation at Tyndall AFB FL (1) to determine the magnitude of contamination and the potential for migration of contaminants in the various environmental media; and (2) to identify potential environmental consequences and health risks of migrating pollutants based on State or Federal standards for those contaminants. The Phase I and Phase II Stage 1 IRP Reports (mailed under separate cover incorporated the background, description and previous work for the sites in this task, (except Zone 11, a new site). (MGM).
A Phase II-Stage 2 survey was conducted at Tyndall Air Force Base (AFB) to confirm and quantify the existence of potential contaminants at former disposal, storage, and fire training sites identified during Phase I and Phase II-Stage 1 studies. Nine sites were investigated including three disposal areas, three fuel storage areas, and three fire training areas. Seventeen ground water monitor wells were installed in the surficial aquifer at the various sites investigated. A surface geophysical survey was conducted at one landfill area to determine the presence and areal extent of ground water contamination. Surface waters, ground waters, sediments, and soils were sampled and analyzed for various specific parameters including pH, specific conductance, total petroleum hydrocarbons, purgeable organics, base/neutral and acid extractable organics, dibromoethane, and priority pollutant metals. Eight of the nine zones were recommended for continued monitoring, and one zone was recommended for corrective action. Keywords: Tyndall Air Force Base, Florida; Installation restoration program. (MGM).
Methyl ethyl ketone analysis was performed by Radian chromatography laboratory. The results of the analysis are in a memo included in this volume. All other samples for chemical analysis were submitted to Radian Analytical Services Laboratory. The samples were logged in, and the data reported in batches . Each batch submitted was assigned a RAS work order number. Volume 2, Volume 3, and Volume 4, Appendix A-1 contain the analytical data reports for the various batches of samples. The bulk of data necessitated the results be bound in three volumes. Volumes 2, Volume 3, and Volume 4, Appendix A-1 contain Tables A.1-1, A.1-3, and A.1-5, respectively, which are a sequential listing of the reports contained in that volume by batch number and Tables A.1-2, A.1-4, and A.1-6, respectively, which are a sample log and cross-reference table. These tables serve as a sample log and cross-reference well numbers, OEHL numbers and the RAS work order numbers under which the results are located. Pages in Appendix A are numbered by the volume number followed by the page number of that volume. For example, Page 2 001 is the first chemistry data page of Volume 2.
Three sites were investigated at Elelson AFB during the Phse II, Stage 2 field evaluation of the IRP. The sites were the sewage treatment plant spill ponds and treated effluent leaching ponds (Site 32) and two base landfills (Sites 2 and 1). A geophysical survey was performed in the vicinity of the sludge treatment plant to help define areas of high electromagnetic conductivity (i.e., potential contamination) and aid in the placement of monitor wells. Eight monitor wells were installed during Stage 2. Ground water samples from Stage 1 and Stage 2 wells were analyzed for purgeable lead, arsenic, cadmium, chromium, mercury and silver. Soil samples from the vicinity of one of the landfills (Site 1) were tested for the presence of pesticides. Trace quantities of purgeable halocarbons and petroleum hydrocarbons were detected in the wells from all three sites. Drinking water standards for total trihalomethanes were not exceeded for any of these samples. Arsenic and cadmium were detected in wells at concentrations were elevated in the vicinity of the sewage treatment plant. Only one well, in close proximity to the sewage sludge drying beds, was found to have nitrate, nitrite concentrations above the Primary Drinking Water Standard. A well downgradient from this site had nitrate, nitrite levels below the same standard. Soils at Site 1 contain trace quantities of DDE, DDD, and DDT. No pesticides were detected in groundwater from the monitor well at this site.