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TO E RO E K N TETRA TECH Appendix B-Unanticipated Discovery Plan ASSOCIATES,INC III. GENERAL UNANTICIPATED DISCOVERY PROCEDURES If any unanticipated cultural resources or suspected cultural resources are encountered during the assessment, the Toeroek Team, the EPA contractor,will follow the general steps outlined below. STEP 1: STOP WORK within a 100-foot radius of the observed cultural material and NOTIFY Toeroek Team Project management. Ensure all cultural items are left in place and that no further disturbance is permitted to occur. All vehicles, equipment, and unauthorized personnel will not be permitted to traverse the discovery site. If the find occurs at the end of the workday, the area must be secured in a manner to prevent vandalism or biological disturbance (such as flooding, animal interference, etc.). • The Toeroek Team field team leader (FTL) will notify the Toeroek Team project manager (PM) or program manager subsequent to securing the discovery location. Refer to Section V to contact the Toeroek Team PM or program manager. STEP 2: NOTIFY State, Tribal, or Archaeological Monitor(s). If a state, tribal, or archaeological monitor is on site for the project, the FTL will notify that person. The monitor will follow the provisions of the monitoring plan if one is in place. If no monitor is on site, the FTL will skip to STEP 3. STEP 3: NOTIFY the EPA Region 9 PM.The FTL will contact the EPA Region 9 PM. If unable to contact the EPA Region 9 PM, the FTL will contact the EPA contracting officer's representative (COR). The EPA Region 9 PM or EPA COR will make all subsequent calls and notifications. EPA,in consultation with the State Historic Preservation Office (SHPO) and qualified archaeologists (as applicable),will determine the subsequent course of action for appropriately treating and evaluating the significance of the cultural resources in accordance and compliance with federal, state, and local laws. Refer to Section V to contact the EPA Region 9 PM. • In the event unintentional damage occurs to a National Register of Historic Places-eligible site during TBA activities, the FTL will immediately notify the EPA Region 9 PM and document any damage.The EPA Region 9 PM will contact SHPO if a SHPO representative is not already monitoring the site. Invasive work will not proceed within the 100-foot radius around the discovery until the appropriate written authorization is obtained after consultation with EPA, SHPO, and qualified archaeologists (as applicable).The Toeroek Team PM or FTL may direct invasive work in other on-site areas away from the discovery site before contacting the concerned parties to ensure TBA activities proceed in a safe and timely fashion. B-2