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Phase II Subsurface Investigation Proposal 239 West 11th Street Tracy, California 95376 Partner Proposal Number P21-341557.1 October 7, 2021 Page 12 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 will perform the following tasks for the Phase II Subsurface Investigation: • Prepare a site-specific health and safety plan; • 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 two business days prior to drilling/backfilling activities; • Notify Underground Service Alert North (USAN) a minimum of two business days prior to drilling activities to clear public utilities; • Clear boreholes and probes of utility lines through a geophysical survey. Boring and probe 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; • Advance six borings withing the proposed swimming pool footprint to a terminal depth of 6 feet bgs, collecting soil samples at 3 and 6 feet bgs; • Field-screen each soil sample using a photoionization detector (PID); • Prepare up to 12 soil samples for laboratory analysis; • Install four temporary sub-slab soil gas probes throughout the interior of the building, immediately beneath the concrete slab foundation; • Purge each probe, then collect and prepare up to four soil gas samples for laboratory analysis using laboratory-provided, batch-certified SUMMA canisters and flow controllers with a 5- to 10-minute sample period; • Analyze each soil gas sample (up to four soil gas samples total) for VOCs via EPA Method TO-15/8260; • Based on field-screening results, analyze each soil sample (12 soil samples total) for carbon chain total petroleum hydrocarbons (TPH-cc) via EPA Method 8015 and for VOCs via EPA Method 8260; and • Compare data to applicable screening criteria, and prepare a report summarizing field activities, methods, and findings. Assumptions Partner has prepared this quotation under the following assumptions: • The work will be performed without regulatory supervision; • Fieldwork will be performed during regular business hours (7:00 a.m. — 5:00 p.m. Monday through Friday, excluding holidays). Additional fees will apply for work conducted outside of regular business hours; • Only the SJCEHD drilling permit will be required to complete this investigation; PARTNER 4 O