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the suction underground piping indicates the presence of the tank being situated underground (aka underground storage tank [UST]).The owner of the tank was listed as Ronald Laub and the tank was classified as a farm motor vehicle fuel tank. The GeoTracker database record was dated June 1988. No additional information related to closure or removal of the tank was provided in GeoTracker. According to interviews conducted during the course of the Phase I, Mr. Hayden Webster (current owner) and Ms. Carrie Heilbrun (current Hospital Administrator), stated they were unaware of the presence of an UST on-site. According to Mr. Webster, the previous owner who purchased the property around 2010 reportedly no longer has documentation from the original owner (who has passed). Therefore, no record regarding the UST was provided by subject property management. Additionally, no record regarding the UST was on-file with San Joaquin County. No documentation was available to indicate whether the tank was removed and if soil samples were collected and analyzed for the presence of petroleum hydrocarbon impacts. During Partner's reconnaissance of the subject property, no clear indication of an UST was observed. Based on the absence of data to confirm whether the tank was removed,or site conditions at the time of a potential tank removal, the possibility exists that the UST, and/or impacts may remain in place at the subject property. Based on the lack of information regarding the disposition of the reported UST or site conditions at the time of removal, the reported UST at the subject property is considered a REC. Based on available information from the SWRCB Geotracker database for a nearby Leaking Underground Storage Tank (LUST) cleanup site (facility identification number T0607700009) located approximately 1,700 feet north of the subject property, groundwater in the vicinity of the subject property is anticipated to be first encountered at 80 to 90 feet below ground surface (bgs) with inferred flow direction to the west. The subsurface is expected to consist of a varying combination of sand, silt, and/or clay to at least 20 feet bgs. Objective The objectives of the project will be to identify the location of on-site UST(s), tankhold(s), and/or other associated features and to evaluate the potential impact of petroleum hydrocarbons and/or volatile organic compounds (VOCs) to soil and/or soil gas as a consequence of a release or releases from the potential on- site UST. To investigate the identified REC, Partner will conduct a Phase II Subsurface Investigation.The investigation scope will include a geophysical survey and the advancement of three borings (131 through 133) to facilitate the collection and analysis of soil and/or soil gas samples. 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. Page 2 PARTNER