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Cleanup in Vulnerable Communities'Initiative Discovery Project Reference:Favorite Cleaners and Enforcement Discovery Investigation Work Plan Project Number:60688620 1. Introduction This document presents a Final Cleanup in Vulnerable Communities Initiative(CVCI) Discovery and Enforcement (D&E)Program Discovery Investigation Work Plan (Work Plan)for Favorite Cleaners located at 622 E Charter Way, Stockton, California 95206(Subject Property).The Subject Property is located on three parcels of land that is designated as San Joaquin County Assessor Parcel Numbers(APNs) 167-150-49, 167-150-50, and 167-150-50 and is designated as California Department of Toxic Substances Control (DTSC)Site Code 108011.The Subject Property location and layout maps are presented in Figures 1 and 2, respectively. This Work Plan was prepared by AECOM Technical Services, Inc. (AECOM)for DTSC in accordance with Contract Agreement Number(No.)22-T5019(AECOM 2022a)and authorized by Work Order No. 2-22-T5019-WO3 dated June 04, 2024(AECOM and DTSC 2024). This Work Plan was prepared in accordance with the Programmatic Quality Assurance Program Plan(QAPP)for Discovery Investigations dated October 19,2022. A DTSC CVCI Discovery&Enforcement project scoping meeting was held with representatives of DTSC and AECOM on May 22, 2024,to discuss the schedule and scope of the Work Plan. 1.1 Work Plan Objectives and Scope A CVCI D&E Discovery Investigation is performed to determine whether current or historical activities associated with dry-cleaning operations have resulted in environmental conditions that may pose unacceptable human health and environmental risks in the context of current and future use plans. CVCI D&E Discovery Investigation projects are divided into phases: Discovery and Enforcement.The Discovery Phase includes preparation of a Phase I Environmental Site Assessment(ESA)report and limited subsurface investigation (Discovery Investigation)as warranted. If the Discovery Investigation identifies a potential release due to dry-cleaning operations,the Subject Property will proceed to the Enforcement Phase that will include complete site characterization and the preparation of a Preliminary Endangerment Assessment report(DTSC 2015a).Additional supplemental or focused investigations are completed as warranted during the Enforcement Phase. If necessary, time-critical removal actions, interim removal actions, and removal/remedial actions are also conducted in the Enforcement Phase. The scope of work defined in this Work Plan is designed to meet the needs of the Discovery Investigation within the Discovery Phase. The Discovery Phase will include the following scope of work: • Evaluating available information for indications of current or past use, storage, disposal, release, or threatened release of hazardous substances at the Subject Property; • Evaluating through a field sampling and analysis program the nature, concentrations, and general extent of dry- cleaning-related compounds that may be present in soil vapor' and/or groundwater at the Subject Property; • If needed, estimating the potential threat to public health posed by hazardous materials at the Subject Property, by using the human health screening evaluation procedure described in the Programmatic QAPP,which is based on an assumed residential land-use scenario; and • Estimating the potential threat to the environment posed by hazardous materials at the Subject Property, by using the environmental screening evaluation procedure described in the Programmatic QAPP. Also referred to as soil gas Prepared for: California Department of Toxic Substances Control AECOM 1