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Section 1 1.1 Introduction In 1957,industry began using internal linings to protect underground storage tanks against corrosion and leakage; in excess of 300,000 heating oil tanks and in excess of 70,000 motor fuel tanks have been internally lined since then.Today,underground storage tanks unprotected against corrosion pose a serious health threat to the nation's groundwater and drinking water supply. In 1988 rules and regulations governing the use and operation of underground storage tanks,requiring existing bare steel tanks to be protected against corrosion by 1998,were established by the Federal Environmental Protection Agency (EPA). The EPA approved two methods for upgrading existing UST's to meet corrosion protection regulations,but interior tank lining was selected as the number one upgrade option. This approach provides not only protection against internal corrosion, but also minimizes leaks which may occur as a result of external corrosion.Corrosion of steel tanks is typically concentrated in minute areas,resulting in the formation of pits and/or rust plugs. Since perforations or rust plugs are very small in size (often not exceeding 1/8" in diameter), they have little or no effect on the tank's overall structural integrity. Application of a 100-125 mil DFT internal lining to a tank provides additional structural strength as it bonds to its walls and bridges perforations in the outer wall of the tank caused by external corrosion.As a result, the tank lining prevents releases due to both internal and external corrosion. Refer to the EPA regulations for upgrading and repairing existing underground storage tanks in the September 23, 1988, Federal Register, Part II,Volume 53, Number 185. Reference 40 CFR, Part 280.21 and 280.33. In the Preamble to 40 CFR 280 of the 1988 Federal Register,the EPA expressed the opinion that with the addition of lining,the life of a bare steel tank can be extended at least ten (10) years with leak free performance. EnvirolineTM 1250 epoxy UST lining from IECC has been specially formulated to deliver superior chemical and physical resistance in a wide variety of petroleum storage environments,and are renowned for their excellent performance in the toughest of these environments. EnvirolineTM 1250 epoxy UST lining, designed for high-build application and sprayed to a thickness from 100-150 mils,is structurally reinforced with glass flakes to form an impervious protective barrier,resistant to deterioration from abrasion, impact, corrosion and chemical attack. Enviroline 125U has been tested thoroughly using recognized industry standards for immersion compatibility and physical properties,and proven to be resistant to all types of motor fuels, gasohol and other reformulated fuels. IECC's network of authorized applicators provides professional tank lining services throughout the United States.For more information,or to locate an applicator in your area,please call our toll-free number:( ) 449-6525. 1.2 Scope 1.2.1 This guideline outlines the recommendations for repair and internal lining of steel and fiberglass underground storage tanks using EnvirolineTM 1250 epoxy UST lining. 1.2.2 Requirements,procedures and operating conditions for lining and/or repairing steel underground storage tanks may be found in Section 2.Also described are all applicable safety requirements,personnel training requirements,isolation of tank and removal of hazardous vapors,vapor monitoring and pre-entry precautions. 1.2.3 Requirements and procedures for the repair of fiberglass reinforced plastic (FRP) underground storage tanks may be found in Section 3. 2/99 Page 1 of 30