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REV: 01-09-25 MI Tank/Reservoir Fiscal Year to be Cleaned (840 California Way) •All tanks are accessible by truck and 20’ trailer and have external ladders. •Entry hatches are greater than 24”. •Water can be discharged on-site with proper dechlorination and sediment control measures. A. Tank Evaluation Contractor shall perform a comprehensive interior and exterior inspection of the tanks. The Contractor shall provide high quality video of all internal surfaces above and below waterline, including the roof, and outside the tank. The video shall be narrated on site. The Contractor shall also provide high quality digital photographs of inside and outside the tank. All equipment and divers shall be properly disinfected prior to each dive. Contractor shall notify the City immediately (same day) if any structural defects are observed on the exterior or interior of the tank, or if the inspection and cleaning cannot be performed for any reason. The following items shall be inspected on each tank: •Condition of steel on the interior and exterior (as applicable). •Condition of concrete walls (as applicable). •Corrosion of any exposed materials. •Conditions of tank hatches, vents and other penetrations, as well as screens, overflow systems and covers. •Measurement of bottom sediment depths in a minimum of four (4) locations. Sediment shall then be averaged out over the surface of the tank. •Percentage of coating failure and corrosion on all coated surfaces. •Condition of foundation and anchors (as applicable). •Condition of any interior and exterior ladders and fall protection systems. •Cathodic protection review of all components (as applicable). •Pit and blister analysis. The extent of pitting shall be described by the location and character. •Examine wall-floor joints for leakage and signs of concrete deterioration. •Examine roof. •Examine all seams and floors. •Inspect support columns and column to roof area. ATTY/AGR.2025.003/H2O Solutions, L.L.C. (Water Storage Tank Inspections and Cleaning) REV: 01-09-25 MI (Page 12 of 19)