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Measurement 1: Measure the tank's inside vertical diameter Customer or customer's representative must record deflection using a graduated wooden gauge stick This measurement measurement on the installation checklist to implement is taken from the bottom of the tank to the bottom of the warranty. tank opening closest to the center of the tank. Measurement 2: After backfilling,and with the installation of BURIAL DEPTH AND COVER gauging pipe to grade level, measure the overall depth from (DRY AREA CONDITIONS) tank bottom to top of grade pipe. Note reading. SUBJECT TO TRAFFIC Measurement 3: Now measure the length of the piping used to Areas where the water table is not expected to reach the bottom achieve grade and subtract it from the overall length from of the installed tank are considered dry hole installations or bottom of tank to top of pipe at grade. areas. The difference between measurement 1 and measurement 3 When a tank excavation is subject to vehicular traffic, backfill should not be any greater than the maximum deflection and traffic pad covering help dissipate traffic loads. measurements listed below. The following requirements apply: Tank Diameter Maximum Deflection Areas subject to heavy vehicular traffic shall have a protective 48" 1/4" cover of at least 30" of compacted backfill with 6" of asphaltic 64" 5/16" paving or shall have a protective cover of at least 18" of 72" 3/8" compacted backfill with 8" of reinforced concrete. All traffic 96" 1/2" pads shall extend at least 12"beyond the perimeter of the tanks. 120" 5/8" 126" 5/8" If compacted backfill of crushed stone or pea gravel are the only 132" 3/4" cover, it shall be a minimum of 36" inches deep. 144" 1" Consult NFPA-30 and PEIW-100 for additional references. Example: 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.. ---L— Measurement 2: After backfilling,with opening being piped to �---L—r 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 30 in. bottom of the opening measures 37 1/2" 61n. :18 in.::;::,. 6 in. : asphalt :::•:: reinforced .:. Therefore: 133 3/8" -37 1/2"=95 7/8"verses measurement 1 paving concrete 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. M 0 � a Z � w O � W w p \ O � ~ V7 r Y Q O d W TVH- J O N 0 O w MW W Dry Area Conditions not subject to traffic loads W Q N ;W Z UJ ffi Dry hole condition areas not subject to vehicular trac shall Z a w o have a protective cover of a minimum of 12 inches of clean o fy Y compacted backfill covered by 4 inches of reinforced concrete � _ DZ 0 w a or 6 inches of asphaltic paving. o � W Zo If compacted backfill is the only cover, it shall be a minimum of Z 24 inches deep. Consult NFPA-30 and PEI/RP-100 for additional references.