Illinois Administrative Code › Title 41 - FIRE PROTECTION › Part 175 - TECHNICAL REQUIREMENTS FOR UNDERGROUND STORAGE TANKS AND THE STORAGE, TRANSPORTATION, SALE AND USE OF PETROLEUM AND OTHER REGULATED SUBSTANCES › Subpart D - DESIGN, INSTALLATION AND CONSTRUCTION REQUIREMENTS › Section 175.465 - Additional Requirements for Installation and Upgrade of USTs

Current through Register Vol. 48, No. 28, July 12, 2024
Installation and upgrade of USTs shall be properly conducted
				  in accordance with 41 Ill. Adm. Code 172, 174, 175, 176 and 177 and
				  manufacturer's recommended procedures and instructions. In addition, the
				  following requirements shall be adhered to:
a) Excavation for USTs shall be made with due
				care to avoid undermining of foundations of existing structures.
b) The UST site shall be prepared to ensure
				safe movement and installation of equipment and materials. Sloping, benching,
				stepping or shoring the sides of excavations shall be performed in compliance
				with OSHA requirements under 29 CFR 1926.
c) Upon delivery at the installation site,
				tanks and piping shall be inspected to detect any evidence of damage to
				coatings or structure.
d) Upon
				discovery of any damage to tanks or piping, repairs shall be made in accordance
				with 41 Ill. Adm. Code 172, 174, 175, 176, and 177 and manufacturer's
				instructions.
e) Equipment shall be
				provided with sufficient lifting capacity to unload and place USTs into the
				tank excavation. The tank shall be placed in the excavation with care, since
				dropping or rolling the tank into the excavation can break a weld, puncture or
				damage the tank, or scrape off the protective coating of coated tanks. Tanks
				shall not be rolled, dropped or dragged.
f) Tanks shall be set on firm foundations and
				surrounded with at least 12 inches of noncorrosive inert material such as clean
				sand or gravel, well-tamped in place.
g) USTs shall be installed to safeguard
				against movement by anchoring in accordance with manufacturer's
				instructions.
h) Unless otherwise
				prescribed by the manufacturer's recommended installation procedures, steel
				tanks shall be covered with a minimum of 3 feet of approved backfill material.
				USTs existing on October 1, 1985 shall be buried so that the tops of the tanks
				will not be less than 2 feet below the surface of the ground or shall be under
				at least 12 inches of approved backfill material and a slab of reinforced
				concrete not less than 4 inches in thickness; the slab shall be set on a firm,
				well-tamped earth foundation and shall extend at least one foot beyond the
				outline of the tank in all directions. When asphaltic or reinforced paving is
				used as part of the protection, it shall extend at least one foot horizontally
				beyond the outline of the tank in all directions.
i) Tank to tank separation distance shall be
				a minimum of 24 inches for all tanks installed after May 1, 2003.
j) There shall be a minimum of 2 manufactured
				slotted or perforated observation wells of at least 4" diameter installed in
				each new tank field of tanks larger than 1,000 gallons and one well for 1,000
				gallon tanks or less and shall have 2 wells for fields with more than one tank.
				They shall be placed at opposite ends or opposite corners one foot below the
				invert elevation of the lowest UST. Lids shall be securely protected against
				unauthorized activities. Only one well will be required if groundwater flow
				direction can be proven and that proof is supplied at the time of permitting
				and the well is then installed in the downstream location.
k) Metallic tanks and metallic piping shall
				not be backfilled with cinders or other material of corrosive effect. Corrosion
				protection shall be provided in accordance with Section
				175.510.
l) Before the final inspection, but after the
				UST system has been installed, connected, backfilled and covered, tank and line
				precision testing shall be done on the entire UST system. Passing test results
				from the tank and line precision tests shall be available for the inspector to
				verify at the time of the final inspection.
m) Any work performed in or around the
				excavation area must stop at sunset unless adequate lighting is
				provided.