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i o Recheck tank for liquid product. o Begin vapor free/tank ventilation with compressed air venturi device. Device must be grounded to prevent buildup of static electricity. o Use Gastechtor to check vapor levels in tank hole or other excavations to insure vapors have not collected. o Tank LEL must be less than 10% or as instructed by local fire marshal before it may be moved. o Drums of extracted water/product are to remain on site for later disposal. Drums must be labeled as to contents. o Tanks must be removed from site as soon as possible and properly disposed of. 9.1.10 Use of electrically powered tools in tank excavation while old UGST are in ground is prohibited. 9.1.10.1 A manual four wheel cutter is recommended for cutting lines when necessary. 9.1.10.2 Pneumatic tools may be used providing LEL in tank area is confirmed below 20% Gastechtor reading. 9.1.11 All persons not required to be working at the excavation should remain outside work area. 9.1.11.1 Watch for fellow workers walking around excavation, hopto, loader, and other heavy equipment. 9.1.12 No personnel may enter a tank excavation deeper than five feet below grade for any reason unless the excavation is properly shored or terraced. 9.1.12.1 Personnel may enter the excavation to walk on the tank top during purging, LEL checks or to attach chains for removal, as per above. 9.1.12.2 Use extreme caution when walking on any tank top as they can be very slippery. 9.1.13 When working in the street, all personnel must wear red vests and hard hats. Stop/slow paddles must be used by traffic control personnel. Traffic control personnel must be used anytime normal street traffic is affected, i.e. , loading or unloading tanks. 9.1.14 If a vehicle or piece or equipment is protruding into the street, it must be coned and/or barricaded. Two way traffic must be maintained. Page 4