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