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Phase II Subsurface Investigation Workplan Dollar General 2150 West Alpine Avenue Stockton, California 95204 April 26, 2022 Page 12 completed on-site, and the operation during a time of little to no regulatory oversight, the presence of the on-site dry cleaning business is considered a REC. Based on available information from the State Water Resources Control Board (SWRCB) GeoTracker database for the Leaking Underground Storage Tank (LUST) Cleanup Site (facility identification number T0607700697) located approximately 0.6 mile to the southwest of the subject property, groundwater in the vicinity of the subject property is anticipated to be first encountered at approximately 8 to 15 feet below ground surface (bgs)with an inferred flow direction to the southwest.The subsurface is expected to consist of a varying combination of clay, silt, and sand from the ground surface to at least 15 feet bgs. Objective The objective of the project will be to evaluate the potential impact of chlorinated solvents to soil, soil gas, and/or groundwater as a consequence of a release or releases from the historical on-site dry cleaning operations. To investigate the identified REC, 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, soil gas, and/or 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 State Water Resources Control Board (SWRCB), the Department of Toxic Substances Control(DTSC),and the 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 will perform the following tasks for the Phase II 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; • Notify the applicable regulatory agencies a minimum of 48 hours prior to drilling/backfilling activities; • Clear boreholes 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. Additionally, to the extent practical based on subsurface lithology, clear boring locations using hand tools; PARTNER 0 00