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Phase II Subsurface Investigation Proposal 601 North Central Avenue Tracy, California 95376 Partner Proposal Number P22-353833.2 February 16, 2022 Page 12 from a historical pipeline (Old Valley and TAOC Pipelines) managed by Chevron. The regulatory database report also indicates that this is associated with or monitored by the Regional Water Quality Control Board (RWQCB). This is likely related to the Chevron TAOC 6th Street Tracy Rail Yard further discussed below and is considered a REC to the subject property. • Chevron TAOC 6th Street Tracy Rail Yard is identified as a Cleanup Sites site on 56 acres in the regulatory database report. On June 30, 2009, investigation began at this site for possible impacts to local groundwater (uses other than drinking water) and soil from crude oil pipelines that used to operate here in the late 1960s. By the 1980s most of the site features had been removed. In 1965, one of the pipelines began to leak and was stopped at an undisclosed time.According to documents from the RWQCB Geotracker website, as of October 1, 2021, a completed soil investigation was awaiting submittal.According to a Central Valley RWQCB representative, the remediation efforts are still ongoing and Chevron's site investigation report is due in May 2022. Based on the subject property location and unknown extent of impacts, this listing is considered a REC to the subject property. Site-specific groundwater depth and flow direction information was not available.According to GeoTracker, a former Leaking Underground Storage Tank (LUST) site is located approximately 200 feet west of the subject property and groundwater is anticipated to be first encountered between 15 and 20 feet below ground surface (bgs)with variable flow direction.The subsurface is expected to consist of silts and sands to at least 5 feet bgs. Objective The main objective of the project will be to evaluate the potential impact of volatile organic compounds (VOCs)to soil gas as a consequence of a release or releases from the adjoining active TAOC pipeline cleanup site. To investigate the identified RECs, Partner will conduct a Phase II Subsurface Investigation.The investigation scope will include the advancement of five borings to facilitate the collection and analysis of soil gas 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 State Water Resources Control Board (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 San Francisco Bay Regional Water Quality Control Board (RWQCB) Environmental Screening Levels (ESLs) PARTNER 4 4 O