ACI 350.1M-10 Specification for Tightness Testing of Environmental Engineering Concrete Containment Structures. 2.3—Execution 2.3.1 Test preparation 2.3.1.1 The exposed concrete surfaces of the containment structure, including the floor, shall be cleaned of all foreign material and debris. Standing water in or outside of the containment structure that would interfere with the examination of the exposed concrete surfaces of the containment structure shall be removed. The concrete surfaces and concrete joints shall be visually examined by the Contractor for potential leakage points. Areas the Contractor believes are areas of potential leakage shall be repaired before filling the containment structure with water. Unless otherwise specified, coatings shall not be applied until after the hydrostatic tightness testing has been completed. 2.3.1.2 All openings, fittings, and pipe penetrations in the containment structure shell shall be visually examined at both faces, if practical. 2.3.1.3 Liners that are mechanically locked to the surface during the placement of the concrete shall be installed before the hydrostatic tightness testing. Interior liners shall be visually examined for pinholes, tears, and partially fused splices by the Contractor. Integrity testing of interior liners, when required by the Contract Documents, shall be performed and passed prior to hydrostatic testing. Deficiencies shall be repaired. 2.3.1.4 All containment structure penetrations and inlet/outlets shall be securely sealed to prevent the loss of water from the containment structure during the test. If the containment structure is to be filled using the containment structure inlet/outlet pipe, positive means shall be provided to check that water is not entering or leaving the containment structure through this pipe once the containment structure is filled to the test level. 2.3.3.8 The change in water volume in the containment structure shall be calculated and corrected, if necessary, for evaporation, precipitation, and temperature. If the loss exceeds the required criterion, the containment structure shall be considered to have failed Part 2 of the test. 2.3.4 Retesting 2.3.4.1 A restart of the test shall be required when test measurements become unreliable due to unusual precipita- tion or other external factors. 2.3.4.2 It shall be permitted to immediately retest a containment structure failing Part 2 of the hydrostatic test when Part 1 is passed. If the containment structure fails the second test or if not immediately retested after the first test failure, the interior of the containment structure shall be observed for probable problem areas by the Contractor. The containment structure shall only be...
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