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2. Background Relevant background information is provided below, including a general description of the Site; a brief review of the Site's history with respect to hazardous material use, handling, and/or storage; and a review of known and potential releases of hazardous substances at the Site. 2.1 Site Description The Site is located at 3081 North Tracy Boulevard within the Tracy Corners Shopping Center. The shopping center encompasses 8.3 acres with approximately 86,160 square feet of single-story commercial/retail space. The Tracy Corners Shopping Center is located at the southwest corner of the intersection of North Tracy Boulevard and Clover Road within a mixed commercial and residential area of San Joaquin County. The shopping center is currently occupied by retail commercial establishments including a supermarket, restaurants, nail and hair salons, insurance and financial outlets, an automobile parts store, and various professional services. The former Quality Cleaners is located in the southwestern portion of the Tracy Corners Shopping Center. 2.2 Site History Quality Cleaners began operating at the shopping center in 1992. Quality Cleaners reportedly used PCE in a closed loop system as part of the dry-cleaning process until 2007 when they switched to a hydrocarbon- based solvent. The Tracy Corners Shopping Center is still occupied by various retail and commercial establishments. 2.3 Known and Potential Releases of Hazardous Substances at the Site A subsurface investigation initiated in 2014 identified CVOCs in soil gas at concentrations exceeding applicable Environmental Screening Levels (ESLs) thereby potentially indicating a release had occurred. Subsequent subsurface investigations, completed by Partner, confirmed impacts to soil, soil vapor and groundwater beneath and around the drycleaner. Since 2014, multiple investigations have been completed at the Site, key takeaways from these investigations are provided below. The chemicals of potential concern (COPCs) have been identified as chlorinated solvents, primarily PCE. PCE in soil vapor has been detected at concentrations up to 72,000 micrograms per cubic meter(µg/m3)with the highest concentrations located behind (south)the drycleaner. Elevated PCE concentrations (up to 2,000 µg/m3) in soil vapor was also observed along the western boundary of the Site. Partner operated a SVE system at the Site to address the elevated PCE concentrations in soil vapor. It is Roux's understanding that the SVE system was shut down and that soil vapor has not been sampled following shutdown. Between November 14, 2018, and May 29, 2019, soil vapor testing of wells SVE-1 through SVE-9 showed a reduction in VOC concentrations.The results suggest that operation of the SVE system reduced concentrations of PCE in soil vapor in the area of the former dry cleaner site towards the southern property boundary. Partner installed five groundwater monitoring wells at the Site (MW-1 through MW-5). PCE concentrations exceeded the California Maximum Contaminant Level (MCL) of 5.0 micrograms per liter (µg/L) in MW-1, located behind (south)of the drycleaner. DTSC has requested additional groundwater samples be collected to the north and northwest of MW-1 to address concerns regarding the uncertainty of MW-2s downgradient location to MW-1. Additionally, in 2020, Partner installed two offsite soil vapor probes (SG-40 and SG-41) south of the Site on the north side of Scarlett Place. Two rounds of sampling were completed after 3989.0001 S.104/HSP Site-Specific Health and Safety Plan I ROUX 17