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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. j refer to Supplemental Documents(Section R). <br /> When installing a tank equipped with a bottom <br /> PREFERRED METHOD sum /fittin excavation and backfill must be modified to <br /> i <br /> sump/fitting, <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 sumplfitting in <br /> all directions. <br /> ® • Backfill by hand with approved tank backfill. <br /> Avoid surface loads that may result in a collapse of • The void around the bottom sump/fitting 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 soil • <br /> between existing and new installation <br /> (see Figure J-1). All connections to the tank must be flexible. <br /> Provisions must be made to accommodate <br /> Figure J-1 movement and misalignment between the piping and <br /> the tank.Failure to do this may damage the tank or <br /> afro. surrounding property. <br /> min. <br /> EXTERNAL PIPING <br /> XV <br /> NY,NY • Isolate the piping from the concrete pad <br /> �i��\ Existing r��ri���i��\ New (see Figure K-1). <br /> \r'\ 9 \r\r�\r\\ \r\\ <br /> riNri Tank ri\ri\ri�ri Tank r�\r <br /> • A flexible connector must be installed on all tangentially <br /> Native mounted fittings.The flexible connector must allow for <br /> ii ire ri: Soil , <br /> "of differential,angular,expansion,and compression <br /> rr�rr�irr\�ir��ir�rr rr r rr�rr�irr��ir rr rr�rr�rr rr��ir rr�i�i��ir�rr�rrr\�i�r��ir i 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 /> • Remove the surface slab. <br /> • Enlarge the excavation for the new tanks, leaving as ;\\ <br /> Flexible Connector Flexible Connector <br /> much backfill as possible around the existing tanks \ �\ <br /> (see Figure J-2). \ \\ <br /> Figure J-2 <br /> ��� • Take precaution during construction to make sure no <br /> damage occurs to the exposed pipe(s). <br /> Existing Existing piping i must terminate a minimum of 4"from <br /> \r��\ Tank Tank New Tank p p g <br /> rim 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 /> \rdeflection(see Figure K-2). <br /> rrr�rrirrirrirrirrirrirrirrirrirrirrirrirrirri irrirrirrirr�rriyrirrirrirrirrirrirri <br /> Figure K-2 <br /> 4"6' <br /> '.6'. <br /> • Install shoring, if necessary,to make sure that 8',10'Dia.Tanks 12'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 />