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D. . PRESSURE TANK 1. The water supply pressure tank shall be of all welded steel construction built in accordance with the requirements of the A.S .,;.E . Code Section VIII for Unfired Pressure Vessels . All seams shall be double welded butt joints . The tank shE-.11 be designed for a working: pressure o.f 100 pounds per square inch, and shall be tested to a pressure of 150 lbs . per square inch before being painted . The outside of the tank shall be given one shop coat of red lead and oil, and the inside thorou.:hly sandblasted and cleaned of all rust , scale and foroign matter and . given one coat of Inertol No . 626 Primer and two coats of Inertol no. 5504 Aluminum paint. 2 . The tank supplier shall provide all necessary taps and couplinr7s for pressure system controls . 3. Shop drawings shall be supplied to the --,Ingineer and approved prior to commencing any fabrication. 4. Excavation for the tank base shall be carried to firm undisturbed soil , in no case less than twelve inches below the original ground surface. Should the Contractor excavate to a greater death than required for the foundations or, if, in the opinion of the ng:ineer, the soil has inadequate bearing value an, additional excavation is required, the additional depth shall be filled by on.e of the following methods : 1. By incrresing the depth of the foundation. 2 . By filling to the plan elevation with Class "C" concrete vibrated into place. 3. By placing approved imported material in layers not exceeding four inches in depth. each layer shall be moistened and thoroughly tamped to a relative compaction of not less than 95 percent. Excavation for all other concrete at the well site shall be as outlined above except that undercutting may be backfilled to the proper level using clean sand , graded gravel , or other approved material. No further work shall be conducted until the Engineer has approved the foundation upon which concrete is to be placed. 5. Concrete work Forms shall be smooth, mortar tight , true to the dimensions given , and have sufficient strength and bracing to prevent distortion when the concrete is added . All exposed corners shall be chamfered with 1" x 1" triangular fillets , surfaced on all sides . All forms shall be treated with a mineral- form oil or wet thoroughly with water immediately before placing the concrete. When form oil is used , it shallbe applied before the reinforcement is placed . Any material which will adhere to or discolor the concrete or affect the painting; of the structure shall not be used . Reinforcing steel shall conform to the sizes and shapes shown on the drawinF:s . Before being placed in the forms , the steel shall be thoroughly cleaned of mill or rust scale, mortar, oil, dirt , or cortin,s of any character that would tend to destroy or reduce the bond . It shall be accurately placed as shown on (47)