• Generally you can expect to see increases in CO2 and corresponding reductions in target contaminants over time.
• If increased CO2 does not correspond to reductions in concentrations over the longer term, that may be an indicator that the biological approach is working but a persistent source (eg. soil contamination above water table) is still active.
• In higher pH environments (ph > 7.5), Alkalinity is a good way to evaluate CO2.

Internet Based Training www.itrcweb.org
ITRC www.itrc
EPA-Chlorinated Solvents www.EPA.gov
Screening Matrix www.frtr.gov/matrix2/section4/4-2.html
Engineering News Record http://www.enr.com/
State Drycleaner Coalition http://www.drycleancoalition.org/pubs.cfm
USGS http://water.usgs.gov/
Trade Shows http://www.environmental-center.com/events.htm