As Chemical Demilitarization facilities destroy the U.S. Stockpiles of Chemical Weapons they have to prove that decontaminaton is complete and no harmful amounts of chemical agents such as HD, GB and VX remain when the land is returned to the state. EPA had no chemical agent methods promulgated which results in the EPA or State taking longer to approve the RCRA Closure Plan. Chemical agents are quite different from many other hazardous compounds in that they are quite reactive and achieving the required data quality objectives harder. Normal EPA methods were tried for chemical agents but did not work on the Johnston Atoll facility, JACADS. There are eight demil sites and each site operates independently. The Chemical Material Agency did not want 8 sites each developing closure methods and each trying to get their EPA region to approve their methods. Shaw was tasked with our teaming partner Southwest Research Institute (SwRI) to modernize and standardize extraction and analytical methods for chemical agents. We have worked closely with EPA Region IX and the SW-846 Method Workgroup during our method development and this led to an extensive method validation effort which will cummulate with EPA's promulgation of the methods. This will lead to shorter times to obtain EPA approvals on RCRA Closure Plans result in significant cost savings to the government.