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Work Plan for Phase II Subsurface Investigation 930 East Charter Way Stockton, California 95206 Partner Project Number 17-204651.2 February 1, 2018 Page I 2 Objective The main objective of the project will be to investigate the potential impact of petroleum hydrocarbons, metals, and/or volatile organic compounds (VOCs) to soil, soil gas, and/or groundwater as a consequence of a release or releases from the historical on-site auto repair and dismantling operations. To investigate identified RECs, Partner will conduct a Phase II Subsurface Investigation. The investigation scope will include the advancement of eight borings to facilitate the collection and analysis of soil, soil gas, and/or groundwater samples. Refer to the attached map for the proposed boring locations. If soil, soil gas, and/or groundwater impacts are observed/recorded, the investigation scope may not be sufficient to evaluate the extent and magnitude of subsurface impacts and additional laboratory analysis and/or sampling beyond the proposed scope may be required. Scope Sampling procedures will generally conform to the requirements of the SJCEHD, the State Water Resources Control Board (SWRCB), the Department of Toxic Substances Control (DISC), 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 SFBRWQCB ESLs. Partner will perform the following tasks for the Additional Phase II Subsurface Investigation: Prepare a site-specific health and safety plan; Notify Underground Service Alert (USA) a minimum of 48 hours 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; Notify the applicable regulatory agencies a minimum of 48 hours prior to drilling/backfilling activities; Clear the borings of utility lines through a geophysical survey, boring placement will be modified as necessary based on the geophysical survey results to avoid damaging underground features; Advance a total of eight borings throughout the subject property (with a bias towards potential releases) according to the following schedule: Area of Concern Number of Borings Terminal Depth (ft bgs) Matrix Sampling Depth (ft bgs) Office and Auto 2 15 Soil 2, 5, 10, 15 Repair Building Soil Gas 5 Warehouse and 2 15 Soil 2, 5, 10, 15 Auto Repair Building Soil Gas 5 Former Wrecked 2 10 Soil 2, 5, 10 Auto Storage 1 40 Soil 2, 5, 10, 15, 20, 25, Former Wrecked 30, 35, 40 Auto Storage Groundwater 30-40 PARTNER