Agmt19 Inland Potable Services, Inc.

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EXHIBIT A I. Scope of Work Contractor will provide interior cleaning and inspection services for three potable water tanks in Redwood City, California: • Glenloch • Easter Cross • Lakeview Tank Evaluation Contractor shall preform 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. 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 at least (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). • Cathodic protection review of all components (as applicable). • Pit and blister analysis. The extent of pitting shall be described by the location and character. • Wall -floor joints for leakage and signs of concrete deterioration. • Roof. • All seams and floors. • Support columns and column to roof area. • Dry Film Thickness (DFT) readings of painted surfaces (roof and wall plates) Tank Cleaning The Contractor shall comply with latest AW WA standards for tank cleaning. Cleaning shall be conducted with the tanks full and bottom sediment shall be removed. Contractor shall provide equipment capable of cleaning and inspecting tanks, which shall consist of, but not limited to, the following: • Two-way diver -to -surface communications. • Complete underwater lighting system. Page 6 of 8 REV: 05-16-19 ATTY/AGR.2019.136/Inland Potable Services, Inc. - Inspection & Cleaning of Water Tanks