This delivery order modification increases funding and extends the performance period for environmental remediation support services under the Navajo Area Uranium Mines Response Assessment and Evaluation Services II (NAUMRAES II) contract. Tetra Tech, Inc., a large environmental consulting and engineering firm headquartered in Pasadena, California, will provide non-time-critical removal action planning and oversight support associated with EnPro Holdings contamination on the Navajo Nation in Arizona. The work is performed under the EPA Region 9 single-award IDIQ contract (valued at $65 million through April 2028), with this delivery order ceiling valued at approximately $429K and performance extending through April 30, 2028. No small business set-aside designation applies to this award.
The Environmental Protection Agency Region 9 issued this modification to support the federal Superfund program's cleanup and assessment activities at abandoned and contaminated sites in the Southwest. Tetra Tech has demonstrated extensive expertise in uranium mine remediation and environmental site assessment across the Navajo Nation through prior delivery orders under the NAUMRAES II vehicle and frequently engages minority-owned and woman-owned small business subcontractors, including Native American-owned enterprises, to deliver specialized technical and field services. The work will be performed in Tuba City, Arizona, on a time and materials basis.