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A15. Manway Risers <br />(the Fiberglas Manway Riser provides access from a <br />manhole box and cover.) <br />AWARNING <br />• Do not enter tank <br />• Entry can result in: <br />ASPHYXIATION EXPLOSION FIRE <br />Entering the manway riser or the tank after installation is a <br />confined space entry. Follow proper safety procedures. <br />• Since the riser bottom is open, the manway riser will <br />fill with water as water surrounds it on the outside. <br />• Traffic areas require a reinforced concrete traffic pad. <br />• Because of potential tank buoyancy, tank sizes of 10,000 <br />gallons and larger <br />❑ May use a maximum of 2 manway risers. <br />• Tank sizes less than 10,000 gallons, installed at minimum <br />burial depths: <br />❑ May use only 1 manway riser. <br />• The riser must be installed with a minimum 6" of clearance <br />from the top of the tank. <br />• The bottom of the riser should be supported with wood <br />pieces measuring a minimum 2" x 4" x 4'0". <br />Reinforced Concrete <br />#5 Rebar 8" on Center <br />24" 124" Manhole Box with Cover <br />Both Ways (2 layers) <br />(not supplied) <br />9.. <br />�-- 48" ID <br />42" <br />Standard <br />Riser <br />A <br />22" Manway <br />A} <br />1 <br />- <br />2" x 4"x 4'0" Min. or <br />Equivalent Wood <br />Required to Support Riser <br />71 <br />AA Tank Length <br />Notes: <br />, � <br />1. Riser is not <br />� <br />load bearing <br />2. Rebar mat must <br />extend 4' in all <br />directions from <br />221/2" Sq. <br />center of riser <br />(opening in riser) <br />12 <br />A16. Site Monitoring Wells <br />• New installations - place monitoring wells at least F <br />outside of tank outer diameter. <br />• Existing Installation - place monitoring wells a minimum <br />of 3' from tank sides or ends. <br />O Monitoring Well P <br />Minimum <br />3 Feet <br />• Backfill with same material as tank backfill. <br />