Monitoring and data analysis for the vadose zone monitoring system (VZMS), McClellan AFB 11/20/1998-2/20/1999

摘要

This report contains information on field and laboratory work performed between November 20th, 1998 and February 20th, 1999, at site S-7 in IC 34, at McClellan AFB. At this location, a Vadose Zone Monitoring System (VZMS) (LBNL, 1996) is currently being used to collect subsurface data including hydraulic potential, soil gas pressure, moisture content, water chemistry, gas chemistry, and temperature. Samples have been collected on a bimonthly schedule during the summer and fall. Monthly sample collection commenced in December. This report describes: 1. moisture content changes, based on neutron logging 2.gas-phase VOC concentrations 3. aqueous-phase VOC concentrations 4. metric potential measurements in instrument cluster VZMS-C 5. formation temperature distributions.