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Cleanup in Vulnerable Communities'Initiative Discovery Project Reference:Favorite Cleaners and Enforcement Discovery Investigation Work Plan Project Number:60688620 this gas station. Due to the proximity to the Subject Property lack of UST removal and/or closure information this facility is considered a REC. • GASCO (749 E. Charter Way)is located to the northeast approximately 450 feet from the Subject Property and is listed as a LUST cleanup site.The facility ran as a gas station from 1940 to 2008.According to the information provided by the EDR,this facility experienced gasoline contamination with risk to aquifers used for drinking water. Four LISTS were removed from site in November 1989. Monitoring wells were installed in January of 1990 and a soil vapor extraction(SVE)system was run from July 1997 to July 2003.A tank was installed in(Year)and is listed as(in/active).The LUST case is open as of July 2003. • Hess De Luxe CO (1345 S. California St.)is located to the northwest approximately 575 feet from the Subject Property and was a dry cleaner in 1950. Due to the proximity to the Subject Property lack of any soil or groundwater investigation information and the likely use of chlorinated or Stoddard Solvent this facility is considered a REC. 3.2 Sampling Strategy, Rationale, and Approach All engineering or geologic work, performed as a portion of the Discovery Investigation, will be performed or supervised by a California registered PE and/or PG in compliance with the requirements of the Professional Engineers Act, Business and Professions Code Sections 6700-6899 and 7838 and the Geologist and Geophysicists Act, Business and Professions Code Sections 7800-7887. The field Discovery Investigation will consist of the collection of soil vapor, sub-slab vapor, indoor air, outdoor ambient air, and/or groundwater samples to assess subsurface environmental conditions at the Subject Property. If the Subject Property conditions warrant the collection of groundwater samples,the sampling will be conducted concurrently with the soil vapor survey. Subcontractors will be selected for conducting the soil vapor survey and for collecting groundwater samples as specified in this Work Plan.AECOM will be responsible for utility clearance and obtaining any required agency permits prior to initiating the subsurface investigation. Soil vapor and groundwater samples will be analyzed by Eurofins Environmental Testing and Eurofins Air Toxics, Inc., State-certified laboratories located in West Sacramento and Folsom, California, respectively. 3.2.1 Soil Vapor and Sub-Slab Vapor The purpose of the soil vapor survey is to assess the potential presence of volatile organic compounds(VOCs)in the subsurface.The soil vapor survey will be conducted in accordance with the Programmatic QAPP that was developed in accordance with current DTSC's Advisory for Active Soil Gas Investigations(DTSC 2015b), USEPA Technical Guide for Assessing and Mitigating the Vapor Intrusion Pathway from Subsurface Vapor Sources to indoor Air (USEPA2015a), and the Final Draft Supplemental Guidance: Screening and Evaluating Vapor Intrusion (DTSC, California Environmental Protection Agency[Cal EPA], SWRCB 2023). Soil vapor samples will be collected and analyzed for the full suite of VOCs to assess for vapor intrusion from the subsurface resulting from former/current dry-cleaning activities. Six on-site dual-nested soil vapor probe locations are planned. Soil vapor samples will be collected at 5 and 15 feet bgs at each location, as required by DTSC, and as appropriate based on the Subject Property geology. If shallow groundwater is encountered at a depth of less than 16 feet bgs, deeper probe implant depths will be adjusted to at least 10 feet bgs and approximately 3 feet above groundwater to prevent the capillary fringe from interfering with the collection of soil vapor. If groundwater is encountered at the proposed sampling depths or shallower, or if groundwater is shallower than 5 feet bgs,the proposed soil vapor samples may be cancelled,and grab groundwater samples will be collected, with DTSC concurrence. First groundwater beneath the Subject Property is expected at a depth of approximately 23 to 24 feet bgs. Two soil vapor samples(SG-1 and SG-2)will be collected south of the building near the shed. Four soil vapor samples(SG-3 through SG-6)will be collected west of the building in the parking lot area. Soil vapor samples will be Prepared for: California Department of Toxic Substances Control AECOM 12