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-2- 1.8 Before being covered, enclosed, or placed in use, primary con- tainers and associated piping shall be tested for tightness hydrostatically or with air pressure not less than three pounds per square inch and not more than five pounds per square inch. Pressure piping shall be hydrostatically tested to 150 percent of the maximum anticipated pressure of the system, or pneumat- ically tested to 110 percent of the maximum anticipated pressure of the system, but not less than five pounds per square inch gauge at the highest point of the system. This test shall be maintained for a sufficient time to complete visual inspection of all joints and connections, but for at least ten minutes. 1.9 Primary containers shall be equipped with a catch basin surround- ing the fill pipe to prevent any overflow from infiltrating into the subsurface. 2.0 Secondary Containers (Leak Interception and Detection System) 2.1 Methods of construction for the leak interception and detection system utilizing membrane liners shall meet the following: (1) The membrane liner shall have a permeability factor as tested against ASTM Reference Fuel B; and (2) The liner seam strength shall be equal to the tensile strength of the parent material when tested in accordance with accepted engineering practices for materials testing. 2.2 The liner shall be installed under the supervision of a repre- sentative of the membrane liner fabricator or a contractor certi- fied by such fabricator. 2.3 The excavation base and walls which come into contact with the synthetic liner shall be prepared to the liner fabricator's specifications and shall be firm, smooth, and free of any sharp objects and protrusions. 2.4 The floor of the leak interception and detection system shall be constructed on a firm base and sloped to a collection sump. 2.5 Access casing(s) shall be installedin the collection sump. The access casing shall be: (1) Capable of allowing any liquid that may be moving along the upper surface of the leak interception and detection system to enter the casing; (2) Sized to allow efficient removal of collected liquid and to withstnd all anticipated applied stresses using appro- priate engineering safety facors;