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• 6. The Flyash will be reinforced with two (2) vertical mats using #.4 <br />grade 40 rebar placed on Z8 inch centers both ways, or the equivalent <br />reinforcement area. <br />7. At least one seal in each set of seals shall have surveillance tubes <br />;" copper or ;" schedule 40 pipe or equivalent and be installed with <br />a valve. Tube fittings shall withstand at least 75 psi. The tube <br />shall be extended at least 30 feet inby the seal. Also, the lowest <br />seal in each set should contain a drainage pipe with a U-tube water <br />trap to prevent damming of water. <br />1 <br />r <br />~~ <br />