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Project History Partner completed a Phase 1 Environmental Site Assessment Report(Phase 1) for the subject property, dated May 17, 2021, on behalf of Western Alliance Bank.The subject property is located on the south side of West Fremont Street within a mixed commercial/industrial area of San Joaquin County. The subject property is currently occupied by Delta Wireless and Portside Machine Shop for commercial/industrial use. Onsite operations consist of technology installation/offices and a machine shop activity. In addition to the current structures, the subject property is also improved with asphalt-paved parking areas, associated landscaping, drainage features, trash enclosures, and a pad-mounted transformer. According to available historical sources, the subject property was formerly undeveloped as early as 1913; developed with a portion of the existing building as early as 1957; and developed with the existing building in its current configuration by at least 1993. Tenants on the subject property include Amfac Electric Supply Co/National Electric Supply(1970-1984); Haack Machine Shop and Tool (1984);Spaman Spas/Delta Spa and Pool (1990 and 1994); Carter Distributing (1994 and 1996), Portside Machine Shop (1981 to Present), and Delta Wireless (2003-Present). The following recognized environmental condition (REC) was identified in the Phase I: • Tenants of the subject property between the 1950s and 1970 are unknown (at least 13 years). Further,the subject property has been operated by various machine shop facilities since at least the early-to mid-1980s.These machine shop operations are known to have and continue to use various regulated and/or hazardous materials. Thus, based on at least 13 years of unknown operations at the subject property during the 1950s and 1960s as well as at least 37 years of machine shop operations having been conducted onsite,the historical uses of the subject property are considered to represent an REC to the subject property. According to the California Regional Water Quality Control Board's online Geotracker database, the depth of groundwater in the vicinity of the subject property is inferred to be approximately 5 feet below ground surface (bgs) and groundwater flow is inferred to be toward the north. Objective The main objective of the project will be to evaluate the potential impact of volatile organic compounds (VOCs) soil and groundwater as a consequence of a release or releases from the identified REC. To investigate the identified REC, Partner will conduct a Phase 11 Subsurface Investigation. The investigation scope will include the advancement of four borings to facilitate the collection and analysis of soil and groundwater samples. The proposed investigation scope is designed to evaluate the objective. Based on the investigation results, regulatory conditions, and/or client requirements, subsequent investigation and consulting may be necessary. 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