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September 26, 2025 Ms. Lynsey Sammons, REHS County of San Joaquin Environmental Health Department 1868 East Hazelton Avenue Stockton CA 95205 Subject: Response to Notice of Violation Tiered Permit Program Inspection Report for 7679 Longe Street,Stockton, California Dear Ms. Sammons, EHS-Support LLC,was engaged by Vestis Services to provide assistance concerning the integrity of a wastewater holding basin at their facility located at 7679 S. Longe Street. The following information is prepared in response to the amended San Joaquin Environmental Health Department (the County) CUPA inspection report dated September 4, 2025. Prior to engaging EHS-Support, LLC,Vestis Services arranged with a contractor, Pittsburgh Tower and Tank, who has a specialized coating division,to install a lining system within the wastewater holding basin. Prior to the basin repairs and to review the wastewater process operations, an EHS-Support representative (a California Professional Engineer)visited the facility on August 27,to discuss and understand the basin leak issue with Vestis staff. Based on the testing done on Sept 28, 2024, and March 1, 2025, when the basin pit was filled to the maximum perimeter(which is at the level of the facility's concrete floor or grade surface), the basin lost between 16.5 to 17.5 inches of water over a 24-hour period,which suggested that the pit was losing water at a rate of approximately 0.5 in/hr. Vestis staff believe the leak was occurring at the lowest pipe penetration point through the basin wall. It should be noted based on conversations with local facility staff, the leak testing criteria utilized when filling the basin to maximum capacity is not the normal operating conditions of the basin for their process operations. To verify the leakage rate and possible location of the leak, EHS-Support suggested that the basin be filled 12 to 18 inches above the lowest pipe penetration and if the area of pipe penetration is the leak point,then over a 24-hour period the leak should drain the pit to the level of the leak at the pipe penetration. Vestis staff performed a three-day hydrostatic leak test from August 29 to September 1, 2025,to replicate previous results. However, on this occasion the anticipated leak rate did not occur, as presented in the table below.The only major difference between the previous two hydrostatic tests was the water level to which the basin was filled to initiate the test. The depth to water(DTW) readings in the table represent the depth to water measured in the basin from the maximum perimeter of the basin (i.e., concrete floor surface).These data collectively indicate that the main leak point may be closer to the "rim" of the basin and not at the lowest pipe penetration, and that smaller leaks may be present between the rim of the basin and the pipe penetration. The additional water loss noted by the County in their inspection notes (for the September 2024, and March 2025 tests),that 4.5-inches of water was lost from the pit following the 24-period test period is in line with the 2.83-inches