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®:� Quality Assurance/Quality Control Plan Martin Metals Finishing Inc. (Former) Stockton, California 1 INTRODUCTION This Quality Assurance/Quality Control (QA/QC) Plan has been prepared to support the Preliminary Endangerment Assessment (PEA) to be conducted by CDIM Engineering, Inc. (CDIM) on behalf of Fairgrounds Industrial Park LLC (the Owner) to assess impacts of the historic operations at the Martin Metal Finishing Inc. (MMF)location at 1250 South Wilson Way in Stockton, California (the Site)and to identify whether remediation or mitigation is necessary to achieve Site certification from the CaIEPA Department of Toxic Substance Control (DTSC). The QA/QC Plan is being submitted to DTSC's Site Mitigation and Restoration Program for review and approval and is intended to satisfy Task 18 of the Standard Voluntary Agreement(SVA)for Martin Metal Finishing, Inc, 1250 South Wilson Way, Stockton (Site Code: 102475 & Docket#: HAS-FY21/22-146) dated June 6, 2022 (DTSC, 2022). 1.1 Project Description The Site occupies a portion of the 6.65-acre San Joaquin County Assessor's Parcel Number(APN) 155- 120-07 within Fairgrounds Industrial Park (FIP), a multi-tenant industrial business park. The Site is an approximately 8,500 square foot unit (Buildings B9 and B10 of FIP)within an approximately 120,000 square foot warehouse structure of stucco and wood frame construction, and paved parking area. The MMF operations occurred in the easternmost 150 feet of the warehouse and the associated parking area. The Owner plans to sell the Site along with the eight other parcels comprising FIP prior to 2023. The current and proposed future Site use is industrial,and the future Site owner may redevelop the Site for commercial or industrial use. No residential land use is proposed for the Site.The owner intends to obtain Site closure through the DTSC prior to selling FIP. The goal of the PEA is to address data gaps from previous Site investigations and to collect data representative of current Site conditions,the objective of which is to evaluate the ongoing impact of historical MMF activities on the Site and in Mormon Slough and any necessary remediation or mitigation to achieve Site closure certification from the DTSC. The scope of the PEA consists of the following major elements: • Site preparation, including utility clearance; • Subsurface and sub-slab soil gas sampling at the former MMF operations; • Trench sediment sampling; • Soil boring installation and shallow and subsurface soil sampling; • Laboratory analysis and results interpretation; and • Submittal of a report summarizing findings of the investigation. CDIM—Fairgrounds Industrial Park Page 1