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NOV 7 ' 94 15 : 28 FROM 0 C BAKERSFIELD PLT TO 12095833282 PAGE . 002i003 F"'!OVVEVVENSP ORNING Owens-Corning Field Service Conroe, Texas Page 1 of 2 Installation of Collars on Installed Tanks 1. Reinforce or shore sides of excavation so pad will not undermine, and material will not migrate into excavated hole (per OSHA, Standard 1926. 650 through 1926. 652) . -- Backfill material must be excavated 3 ' down on side of tank where collars are to be installed. Material must be excavated 4 ' around collar retrofit area on top of the tank. (See drawing on page 2) Tank must be empty of fuel (within 1" of bottom of tank) - Note: The Technician will vent the tank to atmosphere to lower iJI�1 explosion levels in the tank to less than lot LEL. Get the tank as empty as possible_- The more product removed from the tank will reduce the time required by the technician to vent. NOTE : IF TANKS ARE DOUBLE- WALL FUEL NEED NOT BE REMOVED. 3 . A safety person, supplied by the contractor, must be available to assist the Technician at all times . This person must be able to speak English. This person must have no other duties other than assisting and monitoring the Technician_ The same safety person should be assigned each day. This will minimize the time required instructing the safety person on proper procedures and policies. An air compressor (minimum 85 cfm) must be available to vent NI(� tank. 5. The water table in the tank hole must be controlled at all times. The Technician is unable to remanufacture interior or exterior surfaces if they are wet. Controlling the water table will also help prevent the tank from floating. 6 . No fuel deliveries can be made to any tank on the site while the Technician is working on the tank. Our Technician will perform an air/soap tightness test confirming his workmanship to the exterior of tank, and possibly identify any other potential problems on the exposed areas of the tank. All efforts must be made to isolate, disconnect, or plug all the piping on the tank. If this test is not done, and at a later date another problem with the tank is identified, it will be the financial responsibility of the owner or contractor to schedule a return trip to the site.