Installation Restoration Program (IRP). Stage 3. McClellan AFB, California Remedial Investigation/Feasibility Study Groundwater Sampling and Analysis Program
Abstract
This Annual Technical Report presents the interpretive results for analytical and hydrologic data during groundwater sampling and analysis activities at McClellan AFB from August 1979 through December 1988. The data are used to evaluate the occurrence and migration of groundwater contaminants, to assess uncertainty in the sampling and analytical processes, to identify any hydrologic and analytical trends developing over time and to evaluate the effectiveness of the Area C and Area D extraction systems. The analytical data were reviewed in terms of specific Quality Assurance and Quality Control procedures. The analytical data were found to meet and exceed QA/QC objectives. Uncertainties due to sampling and analytical variability were calculated for 8 analytes and were found to be less than 30 percent. In Area A, contaminants have been detected in the existing wells but the extent of groundwater contamination cannot be determined. In Area B, pumping of on-and off-base water supply wells appears to be the dominant factor affecting groundwater flow directions and contaminant migration. In Area C, the main direction of contaminant migration has been to the south, following the regional groundwater flow direction. In Area D the extraction systems appears to be working effectively to control groundwater flow and prevent off-base migration of contaminants. Keywords: Statistical assessment, Hydrogeology.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 08, 1989
- Accession Number
- ADA217509