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SAP/QAPP Addendum Lodi-125 N Stockton Final March 24,2025 1.0 INTRODUCTION The U.S. Environmental Protection Agency(EPA) Region 9 is conducting a Targeted Brownfields Assessment (TBA) Phase II Environmental Site Assessment(ESA) for the City of Lodi(the Applicant) located at 125 North Stockton Street,Lodi,San Joaquin County,California,herein referred to as the Site (Figure 1).The Applicant has an interest in redeveloping the property as a part of the expansion of the Lodi downtown zoning.The TBA will evaluate the Site for potential environmental concerns.Results of the TBA, to appear in a Phase II ESA TBA Report,and preparation of an associated Analysis of Brownfields Cleanup Alternatives (ABCA),if necessary,will facilitate a more informed decision on the viability of the Site for the proposed use. EPA has tasked Toeroek Associates,Inc. and Tetra Tech,Inc. (Toeroek Team) to conduct the TBA under Contract Number 68HERH1 9DO01 8,Task Order Number 68HE0920F0038.The purpose of this Sampling and Analysis Plan (SAP)/Quality Assurance Project Plan(QAPP)Addendum is to describe the rationale,data quality objectives (DQOs),field sampling methods,laboratory methods,and quality assurance (QA) and quality control(QC) methods for the proposed assessment work.This SAP/QAPP Addendum addresses specific field sampling and chemical analytical methods pertaining to the assessment of the Site in accordance with the following documents: • Final Programmatic QAPP Revision 2 (EPA [Region 9]/QA Document control number [DCN] FY22BNFD227) (Toeroek Team 2022); • Sampling and Analysis Plan Guidance and Template,Version 4,for Brownfields Assessment Projects (EPA 2018); • EPA Requirements for Quality Assurance Project Plans for Environmental Data Operations (EPA 2001); • Guidance on Systematic Planning Using the Data Quality Objectives Process (EPA 2006) • Standard Practice for Environmental Site Assessments:Phase II Environmental Site Assessment Process (ASTM International [ASTM] 2019); • Uniform Federal Policy for Quality Assurance Project Plans: Evaluating,Assessing,and Documenting Environmental Data Collection and Use Programs,Part 1:UFP-QAPP Manual (Intergovernmental Data Quality Task Force [IDQTF] 2005a);and 1