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• 0 AN RECOMMENDED PRACTICE 1604 warning against certain types of reuse. The former con- tents and present vapor state of each tank, including vapor -freeing treatment and date should also be in- dicated. The label should be similar to the following in legible letters at least 2 inches high: TANK HAS CONTAINED LEADED GASOLINE' NOT VAPOR FREE NOT SUITABLE FOR STORAGE OF FOOD OR LIQUIDS INTENDED FOR HUMAN OR ANIMAL CONSUMPTION DATE OF REMOVAL: MONTH/DAY/YEAR *Or other flammable/combustible liquid. Use the applicable designation, for example, DIESEL. 4.4.5 Tanks that have held leaded motor fuels (or whose service history is unknown) should also be clearly labeled with the following information (see API Publi- cation 2015A for additional guidelines): TANK HAS CONTAINED LEADED GASOLINE LEAD VAPORS MAY BE RELEASED IF HEAT IS APPLIED TO THE TANK SHELL 4.4.6 Tanks should be removed from the site as promptly as possible after vapor -freeing procedures have been completed, preferably on the day of tank removal from the excavation. If a tank remains at the site overnight or longer, additional vapor may be re- leased from any liquid absorbed in the tank walls or residues remaining in the tank. 4.4.6.1 Before the tank is removed from the site, the tank atmosphere should be checked with a combustible gas indicator as specified in 4.3 to ensure that it does not exceed 20 percent of the lower flammable limit. 4.4.6.2 The tank should be secured on a truck for transportation to the storage or disposal site with the 1/8 -inch vent hole located at the uppermost point on the tank. Tanks should be transported in accordance with all applicable local, state, and federal regulations. SECTION 5—STORAGE OF USED TANKS 5.1 Storage Considerations Even though used tanks that have contained flam- mable or combustible liquids have been vapor -freed at one time, they cannot be guaranteed to remain vapor - free. Hydrocarbons may be retained in crevices and under scale and may be released when disturbed or over a period of time. It is important, therefore, that ap- propriate safety precautions be observed at all times. 5.2 Storage Procedures 5.2.1 Tanks should be vapor -freed before being plac- ed in storage (see 4.2). Tanks should also be free of all liquids and residues. All tank openings should be tightly plugged or capped, with one plug having a 1/8 -inch vent hole to prevent the tank from being subjected to ex- cessive differential pressure caused by temperature changes. Tanks should be stored with the vented plug at the highest point on the tank. All tanks should be labeled as described in 4.4.4 and 4.4.5. 5.2.2 Used tanks should be stored in secure areas on the premises of persons familiar with any attendant hazards. and where the general public will not have access. A fenced yard, apart from other facilities, is desirable. SECTION 6—SALE FOR REUSE 6.1 Considerations for Reuse Careful consideration should be given to the reuse of tanks that have been in petroleum storage service. If a tank is sold for reuse, the purchaser should be given a very clear understanding of the former use and present condition of the tank. The seller of a tank to be returned to service in an underground petroleum storage system must inform the purchaser of the tank of the owner's notification requirements under applicable federal regulations (40 CFR 280.11 and 40 CFR 280.22). There may also be similar state or local regulations. Buyers of such tanks should check with the original manufacturer of the tank to determine its suitability for reuse. It is ad- visable to test the tanks for flammable vapors (see 4.3) before they are transported. CAUTION: Tanks that previously contained gasoline must not be used for the subsequent storage of food or liquids intended for animal or human consumption. L 11