| USEPA Region VII REAP: 2004 - 2010 |
Tetra Tech EC / PMRMA Subcontract: 2006 - 2014 |
| USACE / Vicksburg, MS: 2008 - 2015 |
US Dept. of Health & Human Services: 2003 - 2009 |
| USACE / Buffalo, NY: 1991 - 1994; 2008 - 2013 |
USACE / St. Louis, MO (Environmental Services): 1995 - 2019 |
| Indiana DEM: 1989 - 1992; 1997 - 2009 |
URS Group / PMRMA Subcontract: 1996 - 2006 |
| Illinois EPA SRAPL / CERCLA: 1986 - 2007 |
USACE / St. Louis, MO (Laboratory Services): 1992 - 2006, 2011-2016 |
| Navy CLEAN/Halliburton NUS : 1995 - 2000 |
Region VII USEPA / EQM Subcontract: 1999 - 2004 |
| USEPA CLP-SMO: 1991 - 1999 |
USACE / Honolulu, HI : 1997 - 1999 |
| USACE / Baltimore, MD : 1995 - 1998 |
Jacobs Engineering Group / Alaska TERC: 1996 - 1999 |
| USACE / Portland, OR : 1988- 1997 |
US Army Rocky Mountain Arsenal: 1992 - 1996 |
| CDM Federal Programs Corp.: 1992 - 1995 |
USACE / Rock Island, IL: 1987 - 1992; Dallas, TX : 1991 - 1995 |
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