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® Stantec Memo To: Neil Doran From: Ross Smith Stantec Consulting Services Stantec Consulting Services 3875 Atherton Road 9400 SW Barnes Road, Suite 200 Rocklin, California 95765 Portland, Oregon 97225 File: Project No. 185704833 Date: January 27, 2021 Reference: Inadvertent Discovery Protocol for Phase II Environmental Site Assessments at Properties in the City of Stockton, San Joaquin County, California INTRODUCTION This Inadvertent Discovery Plan (IDP) presents plans and procedures for the unanticipated discovery of cultural resources and human skeletal remains and is to be used as a supplemental attachment to ALL work plans proposing invasive and intrusive surface or subsurface site disturbances to be performed as part of Phase II environmental site assessments (including regulated building materials [RBM] surveys)funded through the United States Environmental Protection Agency (USEPA) Brownfields Assessment Grant awarded to City of Stockton as part of the Fiscal Year 2018 (FY2018) USEPA Brownfields Grant Competition. PROTOCOL FOR INADVERTENT DISCOVERY OF CULTURAL RESOURCES In the unlikely event that archaeological materials, features, and other potentially sensitive cultural resources are encountered during a Phase II ESA, all work must cease within the area of the discovery until a qualified professional archaeologist can evaluate the discovery, the California Office of Historic Preservation (OHP) is notified, and the lead agency (USEPA)and consulting parties have agreed that ground-disturbing activities may resume. Recognizing Cultural Resources: A cultural resource discovery could be prehistoric or historic. Examples include: • An accumulation of shell, burned rocks, or other food related materials • Complete or fragmentary mammal, bird and fish bones • An area of charcoal or very dark stained soil with artifacts • Stone tools or waste flakes (i.e. an arrowhead, or stone chips) • Clusters of tin cans or bottles, logging or agricultural equipment that appears to be older than 50 years • Buried railroad tracks, decking, or other industrial materials • Features such as hearths, pits, privies, post-holes or post-molds, stone, brick or wood foundations and walls, and other evidence of structural remains. When in doubt, assume the material is a cultural resource. If any unanticipated cultural resource concerns are encountered during the assessment work, the lead environmental scientist or other lead Stantec or subcontractor field staff on site will follow the steps below: Design with community in mind