Pinyon was contracted by the National Park Service to prepare Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) reports for approximately 382 acres within Tuzigoot National Monument, including Tavasci Marsh, in Clarkdale, Arizona. Pinyon teamed with Toeroek Associates, Inc., to prepare the CERCLA reports associated with legacy impacts from area-wide copper mining and smelting operations.

• Reviewed historical documents and established operational history.
• Studied previous investigation data.
• Assessed the ecological and human health risk associated with historic copper mining and smelting operations.
• Completed a CERCLA Preliminary Assessment and Potential Responsible Party reports.