COMPLIANCE INFO_1996-2006 - Laserfiche WebLink

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F -IL Measurement 1: Measure the tank's inside vertical diameter using a graduated wooden gauge stick This measurement is taken from the bottom of the tank to the bottom of the tank opening closest to the center of the tank. Measurement 2: After backfilling, and with the installation of gauging pipe to grade level, measure the overall depth from tank bottom to top of grade pipe. Note reading. Measurement 3: Now measure the length of the piping used to achieve grade and subtract it from the overall length from bottom of tank to top of pipe at grade. The difference between measurement I and measurement 3 should not be any greater than the maximum deflection measurements listed below. 48" 1/4" 64" 5/16" 72" 3/8" 9600 1/2" 120" 5/8" 126" 5/8" 132" 3/4" 144" 1" Measurement 1: Tank measures 96" from bottom of tank to bottom of opening used to determined deflection. This opening must be the closest opening to center of tank.. Measurement 2: After backfilling, with opening being piped to grade the overall length is measured from the bottom of the tank to the top of the pipe, which in this example is 133 3/8" Measurement 3: The length from the top of the pipe to the bottom of the opening measures 37 1/2" Therefore: 133 3/8" - 37 1/2" = 95 7/8" verses measurement I equals 96". Tank deflection is 1/8". From the above chart maximum deflection allowed for 96" diameter tank is 1/2". Deflection is therefore acceptable. O Z U- 0 M L� F- 0 Z (L 0 LLJ E Customer or customer's representative must record deflection measurement on the installation checklist to implement warranty. 1:111 -:1 F-11 No'] =12 COWN I• 9am Walk 0 -JAII Areas where the water table is not expected to reach the bottom of the installed tank are considered dry hole installations or areas. When a tank excavation is subject to vehicular traffic, backfill and traffic pad covering help dissipate traffic loads. The following requirements apply: Areas subject to heavy vehicular traffic shall have a protective cover of at least 30" of compacted backfill with 6" of asphaltic paving or shall have a protective cover of at least 18" of compacted backfill. with 8" of reinforced concrete. All traffic pads shall extend at least 12" beyond the perimeter of the tanks. If compacted backfill of crushed stone or pea gravel are the only cover, it shall be a minimum of 36" inches deep. Consult NFPA-30 and PE -100 for additional references. Dry hole condition areas not subject to vehicular traffic shall have a protective cover of a minimum of 12 inches of clean compacted backfill covered by 4 inches of reinforced concrete or 6 inches of asphaltic paving. If compacted backfill is the only cover, it shall be a minimum of 24 inches deep. Consult NFPA-30 and PEI/RP-100 for additional references.