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V V Supplement to IkP 160L-==-D-- 6 above any adjacent roof lines. The work area should be S, free from sources of ignition (see. 1.3 .2) . Delete the first sentence of subsection 3 .3.2.3 [formerly 4.2.3] and substitute the following: V A tank may be inerted with an inert gas such as carbon dioxide (CO2) or nitrogen (N2) . In subsection 3.3.2.4 [formerly 4.2.4] , in the first sentence delete the phrase "the vapors in the tank may be displaced" and insert the phrase "a tank can be inerted" . In subsection 3 . 3 .2.5 [formerly 4 .2 .5] , in the first sentence delete the word "exhausted" and substute the word "purged" . V Page 7 Delete the material in subsection 3 .3 .4.3 [formerly 4.4 .3] and substitute the following: 3 .3 .4 .3 [formerly 4.4.3] When an existing LISTS is partially or totally removed, a small amount of contaminated backfill may be encountered. Backfill can be contaminated by minor spills and drips during previous '- operation of the facility or by minor spills and drips during removal of equipment, despite efforts to drain and pump product from the equipment before removal. If severe �- contamination has occurred, local environmental officials and/or fire officials should be notified. Local officials may require isolation and special handling and/or disposal of contaminated backfill materials (see API Publication 1628) . The implementing agency should be consulted about any requirements concerning notification, site assessment, or corrective action. V Page 8 Insert a new "Section 3.4 Change of Service" and add the following material: 3 .4. 1 Before a change of service, the UST must be emptied and cleaned. 3 .4 .2 Any newlservice should be compatible with the former service. The precautions described in sections 3. 3 .4 .4 [formerly 4.4 .4] and 3 .3 .4 .5 [formerly 4.4.53 , above, should be observed.