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Lynsey Sammons San Joaquin County Environmental Health Departmen, Fes:Vestis Facility,7679 Longe 3reet,Stockton,California of water lost during the three-day hydrostatic test, and the 12-inches of water loss occur within the 20- inches between the maximum basin perimeter and level to which the basin was filled for the three-day test. August 29 to September 1, 2025,wastewater pit#1 hydrostatic leak test results Fbading Date Time DTW Difference Loss Pate Monitoring (in) (in) (in/day) Interval (min) Day 0 8/29/2025 16:53 20.50 0.000 Day 1 8/30/2025 16:57 22.50 2.000 1.99 1444 Day 2 8/31/2025 16:53 23.00 0.500 0.50 1436 Day3 9/1/2025 16:58 23.31 0.313 0.31 1445 The three-day test slowed over time,which could indicate one of the following: • The data is similar to a soil infiltration test for a septic system. That is, asthe soil becomes saturated,the soil's capacity to absorb additional water becomes less as the soil pore spaces fill, and the leak apparently slows. • Or that contents in the wastewater contain a mixture that over time acts asa sealant, e.g., acts like a sealant similar to pipe dope. To mitigate the leaks(Rttsburgh Tower and Tank)mobilized to the facility on September 12, 2025, to begin basin repairs. While preparing the basin for the lining process,one of the conveyance pipes entering the basin continued to allow a flow of water not allowing for completely dry conditions to be established and needed for the lining process. Although they attempted to mitigate this condition by inserting an inflatable bladder into the pipe. Unfortunately,this was not successful due to scale build-up in the pipe and the contractor had to cease the project until this condition could be rectified. Vestis is working on corrective actions for removal of the scale build-up so Rttsburg Tower and Tank can resume to project. They anticipate remobilization to occur by October 30tn The County requested soil testing to see if materials may have been released to the environment. Our proposed work plan recommendsthat investigation borehole(s)be installed using a hollow stem augur (that is, drilled by hand)asopposed to using a mechanical drilling rig(i.e. Geoprobe rig).With the concern being that using a mechanical drill rig will push through an underground utility or pipe with being noticed causing unintended damage. Given that portions of the leak appear to occur within the first 20-inches below the rim,we propose to collect a soil sample at 1-foot and 5-feet below the rim. The shallow samplewill provide relative information in the potential "leak" area, and the deeper sample will indicate if any contamination, if present, persistswith depth, or the soil column behaves like a septic system trickle filter and mitigatesany total petroleum hydrocarbons released to soil asthe impacted wastewater percolates through the soil column. To investigate the severity of the leaks,Vestis proposesthe following steps: • Install a borehole adjacent to wastewater basin#1 at location shown in the attached figures. • Collect soil samplesat 1-foot and 5-foot below floor surface. Page 2