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Phase II Subsurface Investigation Proposal 1029-1045 North EI Dorado Street Stockton, California 95205 Partner Proposal Number P21-338831.3 November 10, 2021 Page 13 • Install a temporary soil gas probe in each boring at 5 feet bgs. The final screening depth at each borehole will be adjusted based on the encountered lithology. In general, probes will be screened within coarser-grained materials and clayey/saturated intervals will be avoided, if possible; • Install three temporary sub-slab soil gas probes throughout the interior of the subject property building, immediately beneath the concrete slab foundation; • Purge each probe, then collect and prepare up to six 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 six soil gas samples total) for VOCs via EPA Method TO-15; • Based on field-screening results, analyze one soil sample per boring and each groundwater sample (three soil samples and three groundwater 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; • Fieldwork will be performed on consecutive days in the same week; • Only the SJCEHD drilling permit will be required to complete this investigation; • Permitting fees will not exceed $912. If required, Partner will remit any additional necessary permitting fees on behalf of the Client at cost plus 10% mark-up; • To allow for utility marking per State law, no subterranean work may commence less than a minimum of three business days from receipt of the signed agreement; • A minimum fee of $500 will be assessed for Client-directed cancellation of the project after authorization has been provided; • An additional fee of $2,500 will be assessed for Client-directed cancellation or rescheduling of field activities with less than two business days advanced notice; • Fieldwork will be conducted within the subject property lines on private property. No drilling activities will be performed in the public right-of-way; • The surface cover will be no thicker than 6 inches; • The investigation area will be cleared of obstructions by the property owner, prior to scheduled fieldwork; • The geophysical survey investigation area surface cover does not consist of reinforced concrete; • No more than six boring/probe locations will require utility clearance through the geophysical survey; • The client is responsible for providing information to Partner regarding the location of intra-site utilities. Partner is not responsible for damages to underground or aboveground utilities, for unmarked or mismarked utilities or other features, or for damage that occurs to such utilities or features; • Based on the expected lithology and subsurface conditions to be encountered at the site,the proposed drilling method are direct-push and roto-hammer technology; PARTNER 4 O O O