High Resolution Site Characterization (HRSC) Demonstration-Validation, Air Force Plant 6, GA and Cape Canaveral Air Force Station, FL – USACE Omaha District
KGS conducted High Resolution Site Characterization (HRSC) at Air Force Plant 6 (AFP6), GA and Cape Canaveral Air Force Station (CCAFS), FL to refine the CSMs for each of the sites and better delineate the extent of DNAPL and contaminant distribution. The project evaluated existing cleanup remedies and HRSC technologies to determine the most cost-effective investigation methods for future site characterization and remediation. HRSC technologies utilized included: geophysical logging and bedrock core fracture analysis; high resolution groundwater sampling and hydraulic testing; microbial sampling to determine presence and types of TCE dechlorinating bacteria; dye-enhanced laser induced fluorescence for DNAPL identification; and three-dimensional geologic modeling. Investigation results and modifications to the CSM identified preferential flow paths in weathered bedrock zones which were not previously identified, remediation systems that were positioned incorrectly both laterally and vertically, and stormwater recharge into a permeable reactive barrier that causes changes to the groundwater flow paths and inadvertently introduces oxygenated water in an engineered reducing groundwater environment.