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Supplement to PP 1604 -- p. 6 above any adjacent roof lines . The work area should be 41 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: 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" . 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 USTS 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. 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 new service 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.