Projects Southwest


Project Details
CLIENT   Smurfit-Stone Container Corporation
DATES  May 1994 – March 2004
TASKS  Complete site characterization, treatment, and closure on Tribal Lands

Extensive soil and groundwater contamination were characterized at a wood treatment facility. Under direct EPA and Yavapai-Prescott Tribe oversight, Matrix personnel conducted the Phase I and Phase II site characterizations, treatability studies, pilot treatment, source remediation and closure of the site. The groundwater component of the site closure required extensive well installation and monitoring of the well field. This work was also conducted under direct EPA and Yavapai-Prescott Tribe oversight. Split samples were provided to the agency. Field practices, laboratory QA/QC and reporting was consistent with EPA’s Quality Program.

The monitoring program extended over a period of ten years. The well field included twelve wells or well points. A total of 16,826 analyses were completed, evaluated, reported and approved. Matrix conducted a detailed risk analyses to determine the toxicity of site contaminants and negotiate final cleanup levels. Approximately 100,000 tons of soil was remediated. Groundwater monitoring confirmed that the soil treatment was effective in reducing levels of the contaminants of concern to non-detect levels.

Matrix received closure letters from the EPA and the Yavapai-Prescott Tribe. The USGS and U.S. Fish and Wildlife confirmed the Matrix findings. No further action is necessary at the site. The landowner has placed the property on the market for office/retail development.

From the Yavapai-Prescott Indian Tribe
October 10, 2003 – At this time, the Yavapai-Prescott Indian Tribe (Tribe) is pleased with the work that Matrix Southwest Groundwater (Matrix) performed at the Comprehensive Environmental Response Compensation and Liability Act (CERCLA) site on the Yavapai-Prescott Indian Reservation. When the land is returned to the Tribe, we look forward to benefitting from its economic capability. Although it has been a long process, the return of our land allows the Tribe to continue to grow towards self sufficiency and prosperity for its members. The Tribe appreciates the diligent work of Matrix and its employees at the CERCLA site. The Tribe also sincerely appreciates the EPA’s assistance with this project.

Ernest Jones, Sr.
President/Tribal Board of Directors