| STATUS | |
|---|---|
| RRSE Rating | Contaminants |
| High | Explosives, Arsenic, Lead |
| Media of Concern | Completed IRP Phase |
| Groundwater | RFA |
| Current IRP Phase | Future IRP Phase |
| RFI/CMS | CMS, DES, CMI(C), LTM |
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SITE DESCRIPTION
VAAP-35 includes groundwater issues at the following AEDB-R sites: VAAP-01, 02, 16, 18, 20, 21, 31, 32, 33, 34. This site addresses all groundwater treatment systems as well as installation-wide long-term monitoring. Defining the extent of groundwater contamination at VOAPP is difficult due to the karst geology. Off-site migration of contaminants north and south of the TNT Valley has been confirmed. Explosives concentrations have been found in on-post wells several orders of magnitude above those seen in off-post wells and springs. These concentrations detected in some of the off-post wells are above regulatory guidelines.
As part of a comprehensive GW RFI, 32 additional wells were installed in 2003 in the CDDA, NAA, EAA, WWII BG, and WWII LF. Groundwater RFI activities were completed in 2003. The supplemental wells were primarily installed to determine the lateral extend of groundwater contamination between specific sites to support the individual RFI's being conducted at the CDDA, NAA, EAA, WWII BG, and WWII LF and to support the subsequent mass flux and monitored natural attenuation study to be conducted during the CMS. The Phase I GW RFI Report was submitted in November 2003 to document the Phase I RFI activities; an installation-wide groundwater RFI Report was issued in March 2004.
The Army is also evaluating interim measures to control or address the offsite migration of contaminated GW and to address data needs for determining future corrective measures. Groundwater CMS work plan was finalized in January 2004. Field work included the installation of 53 additional wells to aid in the monitored natural attenuation and mass flux analysis and the collection of over 200 groundwater samples from on and off post monitoring wells and off post springs. Data collection included analysis for constituents of potential concern and key indicator parameters to facilitate selection of a groundwater remedy. A bench-scale treatability study is currently underway to evaluate various treatment technologies for deep soil contaminated with explosives. Bench-scale leachability studies are also being performed to determine if explosives contaminated soils may be a continuing source to groundwater. The field investigation and the treatability study will be completed in late 2004.
PROPOSED PLAN
Future plans include a field scale pilot test of a successful bench scale treatment technology for in-situ treatment of explosives contaminated subsurface soils. Following completion of the pilot test, a CMS report will be prepared to show the comparative analysis of the treatment technologies for the groundwater system including subsurface soils. Implementation of the CMI for groundwater will be dependent on the results of the CMS to be completed in 2005.
