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REV: 01-09-25 MI <br />Tank/Reservoir <br />Fiscal Year <br />to be <br />Cleaned <br />(840 California Way) <br />•All tanks are accessible by truck and 20’ trailer and have external ladders. <br />•Entry hatches are greater than 24”. <br />•Water can be discharged on-site with proper dechlorination and sediment control <br />measures. <br />A. Tank Evaluation <br />Contractor shall perform a comprehensive interior and exterior inspection of the tanks. <br />The Contractor shall provide high quality video of all internal surfaces above and <br />below waterline, including the roof, and outside the tank. The video shall be narrated <br />on site. The Contractor shall also provide high quality digital photographs of inside <br />and outside the tank. All equipment and divers shall be properly disinfected prior to <br />each dive. <br />Contractor shall notify the City immediately (same day) if any structural defects are <br />observed on the exterior or interior of the tank, or if the inspection and cleaning cannot <br />be performed for any reason. <br />The following items shall be inspected on each tank: <br />•Condition of steel on the interior and exterior (as applicable). <br />•Condition of concrete walls (as applicable). <br />•Corrosion of any exposed materials. <br />•Conditions of tank hatches, vents and other penetrations, as well as screens, <br />overflow systems and covers. <br />•Measurement of bottom sediment depths in a minimum of four (4) locations. <br />Sediment shall then be averaged out over the surface of the tank. <br />•Percentage of coating failure and corrosion on all coated surfaces. <br />•Condition of foundation and anchors (as applicable). <br />•Condition of any interior and exterior ladders and fall protection systems. <br />•Cathodic protection review of all components (as applicable). <br />•Pit and blister analysis. The extent of pitting shall be described by the <br />location and character. <br />•Examine wall-floor joints for leakage and signs of concrete deterioration. <br />•Examine roof. <br />•Examine all seams and floors. <br />•Inspect support columns and column to roof area. <br />ATTY/AGR.2025.003/H2O Solutions, L.L.C. (Water Storage Tank Inspections and Cleaning) REV: 01-09-25 MI (Page 12 of 19) <br />6.E. - Page 15 of 23 <br />66