Tetra Tech developed site-specific human health-based environmental action levels (EALs) for pesticides detected beneath former military housing, which decreased the required cost of remediation by over $20 million dollars. Chlorinated pesticides, such as aldrin, dieldrin, and chlordane, were present beneath the foundations of military housing due to their former use to control termites in older housing. Site-specific EALs were developed in accordance with Hawaii Department of Health (HDOH) guidance and information on the duration that military personnel may reside on-base. As part of this work, the health effects assessments for these pesticides, which were conducted in the 1980’s, were re-evaluated relative to recent USEPA guidelines to determine the potential for modifications to the default screening levels used by the HDOH. Based on this evaluation, Tetra Tech successfully negotiated with HDOH regarding the use of modified site-specific EALs at the Base. The modified EALs were used to identify pesticide impacted soils that may require the implementation of mitigation/remediation activities in areas that are accessible to residents. The use of the modified site-specific EALs at the site decreased the required cost of remediation by over $20 million dollars.