Laserfiche WebLink
.,�: �At P A`+ �i.yp,�u. ' c�Fa'eF"'• sem' � �3 ro #�= `�+.-'- - <br /> F <br /> TANKS WITH BOTTOM SUMPS/FITTINGS <br /> Additional tanks may be installed at existing locations To install a large bottom sump in a Non Petroleum tank, <br /> using one of the following methods. refer to Supplemental Documents(Section R). <br /> PREFERRED METHOD When installing a tank equipped with a bottom <br /> sump/fitting,excavation and backfill must be modified to <br /> • Install a new tank in a separate hole at least 36"from provide: <br /> the original excavation. • A hole centered at the bottom sump/fitting location. <br /> • Follow procedures outlined in this Installation Manual. • Hole should be 12"larger than the bottom sump/fitting in <br /> all directions. <br /> � 1� o Y - Backfill by hand with approved tank backfill. <br /> Avoid surface loads that may result in a collapse of • The void around the bottom sump/frtting must be hand <br /> the excavation or disturb any existing tanks. tamped prior to adding the first 12"lift of backfill around <br /> the tank. <br /> • Maintain a minimum 36"at grade of native soil11_ u�'J <br /> between existing and new installation <br /> (see Figure J-1). All connections to the tank must be flexible. <br /> Provisions must be mede to accommodate <br /> Figure J-1 movement and misalignment between the piping and <br /> the tank. Failure to do this may damage tho tank or <br /> ,�— surrounding property. <br /> EXTERNAL PIPING <br /> • Isolate the piping from the concrete pad <br /> Existing New (see Figure K-1). <br /> Tank Tank A flexible connector must be installed on all tangentially <br /> Nativemounted fittings.The flexible connector must allow for <br /> Soil �/2"of differential, angular,expansion, and compression <br /> movement. <br /> Figure K-1 <br /> ALTERNATE METHOD FOR DRY HOLE EXCAVATION <br /> • Lower ballast In existing tanks to less than 25% Isolate from Concrete Pad Concrete Pad <br /> capacity. <br /> • Removetho surface slab, <br /> s <br /> FIf xi t J C nlctort`• +`` -Flexible Connector <br /> ca <br /> Enlarge t excavation x vation for the new tanks g <br /> leavin as <br /> e b e on e <br /> much backfill as around the existing <br /> tanks <br /> (see Figure J-2). <br /> Figure J-2 <br /> LIU • Take precaution during construction to make sure no <br /> damage occurs to the exposed pipe(s). <br /> Existing Existing Internal piping must terminate a minimum of 4"from <br /> Tank Tank New Tank tank bottom for 4',6',8',and 10'diameter tanks and 6" <br /> from the bottom for 12'diameter tanks to allow for tank <br /> deflection (see Figure K-2). <br /> Figure K-2 <br /> 4',6', <br /> • Install shoring, if necessary,to make sure that 8',10'Dia.Tanks12'Dia.Tanks <br /> existing tanks Do not move and sufficient backfill x=4-min. X=6•min. <br /> remains. - - - - - - - - - - - - - <br /> • Install all tanks following the instructions outlined in X <br /> this manual. <br /> • Follow and complete the Tank Installation Checklist <br /> for all new and existing tanks. <br /> Failure to provide adequate clearance may damage <br /> the tank and result in environmental contamination. <br /> 22 <br />