James W. Fowler Co. 12/1/2021 - Laserfiche WebLink

City of Everett,Washington I Reservoir 3 Structural Improvements PDB Project Progressive Design-Build Contract I Exhibit B.Owner's Project Criteria direct the Design-Builder to add scope for liner repairs to address existing leakage to the Phase 2 services. Post-construction liner integrity testing during reservoir refill will consist of the following: • The reservoir will be refilled to the pre-construction baseline water level of 18.0 ft (+/- 0.25 ft). All reservoir inlets and outlets closed, for a 24-hour observation period. Any changes in water surface elevation will be noted, and will be compared to the pre-construction observed 24-hour change in water surface elevation. A post-construction observed 24-hour change in water surface elevation that exceeds the pre-construction observed 24-hour change in water surface elevation by 0.25 inches or more will result in failure of the liner integrity test. If the post-construction test results in an observed 24-hour change in water surface elevation that is either 1) less than the preconstruction observed 24-hour change in water surface elevation, or 2) that exceeds the observed 24-hour pre- construction change in water surface elevation by less than 0.25 inches will result in a passing test for that water surface elevation. • At the Design-Builder's option, refilling of the reservoir may be paused at a lower water surface elevation to check for leakage at lower elevations prior to performing the post-construction liner integrity test, which must be performed when the water surface elevation is at 18.0 feet (+/- 0.25 feet). • If the liner integrity test is passed at the water surface elevation indicated above, the test is completed with no further action required. • If the liner integrity test is failed, the Design-Builder will be responsible for liner repairs prior to retesting (either dry repairs, or if technically feasible, wet repairs), and for the cost of any water needed to refill the reservoir to the water surface elevation at which the liner integrity test failure occurred. 6 Reservoir 3 Cleaning and Disinfection Before conducting liner integrity testing or otherwise filling Reservoir 3 with water, Design-Builder shall clean the reservoir in accordance with City-approved procedures as identified in the City's Reservoir 3 Washdown Procedure Memorandum included in the Reference Documents. The cleaning process will involve coordination with the City as identified in the Memorandum. All materials used for cleaning of potable water tank and system interiors shall conform to the applicable requirements of ANSI/NSF 60 and 61. Following cleaning, Design-Builder shall arrange for Owner's Representative to inspect and verify that cleaning requirements have been met. Page 10 of 12