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• The subject property was identified as a dry cleaning facility from at least 1970 to 2013. Dry cleaning operations typically use chlorinated solvents, particularly tetrachloroethene (PCE), during the dry cleaning process. These solvents, even when properly stored and disposed of, can be released from these facilities in small, frequent releases through floor drains, cracked concrete, and sewer systems. Chlorinated solvents are highly mobile chemicals that can easily accumulate in soil. A review of regulatory agency records indicates the subject property utilized halogenated solvents such as PCE. Although there are no records of a release associated with this facility, the historical use as a dry cleaning facility (40+ years) and the utilization of solvents represents a REC. Based on available information from the State Water Resources Control Board (SWRCB) GeoTracker database for the Cleanup Program Site (facility identification number SL0607724728) associated with a nearby property located approximately 3,800 feet southeast of the subject property, groundwater in the vicinity of the subject property is anticipated to be first encountered at a depth of approximately 45 to 72 feet below ground surface (bgs) with an inferred flow direction to the south-southeast (Third Quarter and Annual 2022 Groundwater Monitoring Report). The subsurface is expected to consist of a varying combination of sand, silt, and/or clay with interlayered caliche from the ground surface to at least 50 feet bgs. Objective The objective of the project will be to evaluate the potential impact of chlorinated volatile organic compounds (CVOCs) to soil, groundwater, soil gas, and/or indoor air as a consequence of a release or releases from the former on-site dry cleaning facility. To investigate the REC, Partner will conduct a Subsurface Investigation. The investigation scope will in- clude the advancement of four borings and the installation of two temporary sub-slab soil gas probes to facilitate the collection and analysis of soil gas, soil, and/or groundwater samples, as well as the collection and potential analysis of four indoor air samples and one ambient air sample. Scope Sampling procedures will generally conform to the requirements of the San Joaquin County Environmental Health Department (SJCEHD), the SWRCB, the Department of Toxic Substances Control (DTSC), and the United States Environmental Protection Agency (EPA). A state-certified laboratory will analyze the samples and the project will be performed under the responsible charge of a qualified Partner representative. Laboratory results will be compared with the San Francisco Bay San Francisco Bay Regional Water Quality Control Board (RWQCB) Environmental Screening Levels (ESLs). Partner will perform the following tasks for the Subsurface Investigation: • Prepare a site-specific health and safety plan; • Notify Underground Service Alert North (USAN) a minimum of three business days prior to drilling activities to clear public utilities; • Secure the necessary drilling permit from the SJCEHD. Permit acquisition will involve submitting a completed application and site plan to the SJCEHD for review and approval and remitting the necessary fees.The turnaround time of the SJCEHD to issue the permit is expected to be no more than two weeks; Page 2 PARTNER