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VI. TANK ENTRY • • Oxygen content will be tested prior to any personal entering the tank. A level above 19 .5% shall be obtained before any work is to be performed in the tank. Personnel entering the tank must be equipped with positive pressure breathing apparratus. The breathing air must be monitored for carbon monixide unless an oil less compressor system is used. Anyone entering the tank must be connected to a safety line held by an attendent outside the tank. Clothing is to consist of a fire retardant suit covering the torso, legs, arms, and head. Disposable clothing that is impervious to the product shall be worn over the fire suit. Tests will be performed periodically by qualified personal to make sure the LEL and oxygen levels are maintained at a safe level. In addition, a halon extinguisher (with a mininmum rating of 40BC) shall be manned while any personnel are in the tank removing the bottom sediment. VII. BOTTOM SEDIMENT REMOVAL All tools used during the bottom sediment removal shall be of a non spark type. Bottom sediment will be placed in tightly sealed containers supplied by the contractor . It will be up to the purchaser to dispose of bottom sediment in' accordance with local, state, and goverment reg&lations. IIX. SURFACE PREPERATION Before any abrasive blasting is to begin, the tank must be checked again with a combustible gas indicator. The entire surface shall be blasted to a white metal finish with a minimum of a 3 .0 mill anchor pattern. Abrasive blast operators shall wear approved blasting helmets that are connected to clean air . IX. TANK INSPECTION Once the tank has been thoroughly cleaned and swept of all blasting material, the tank shall be inspected for structural integrity. Structural integrity shall be checked with a ballpeen hammer in accordance with API regulations. The maximum allowable number of holes is not to exceed more than one hole per year of the age of the tank (Ex. If the tank is nineteen years old, there are to be no more than nineteen holes) provided the following condition are met: 1) The tank does not have an open seam or split longer than 3 inches. 2) The tank does not have a perforation more than 1 . 5 inches in diamter except under the guaging opening where the perforation may be 2.5 inches in diameter.