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:-�,. <br /> , <br /> , <br /> � � � <br /> D y , <br /> q � I <br /> ,�„� Hp�V� <br /> Hx� <br /> k n <br /> pHp�7tl —��� <br /> '+tlH�tl <br /> Hxy <br /> �s1 p � DFSIGN fi CON518IICPION <br /> H <br /> OH <br /> O <br /> ,�]� n The outlet of the spill containment structure shall be equipped with <br /> an AFL/Clark Oil Stop valve, or approved equal, that allows passage <br /> �H� of water but not of the product being stored in the underground <br /> �..� y storage tanks. <br /> N <br /> n C[�ii The lid of the spill containment structu=e shall be designed to vent <br /> � �� � vapors to the atmosphere and shall be constructed of non-sparking <br /> y y �aterial. The pavement around the lid shall be sloped or bermed to <br /> y � y prc��ent the run-on of stozmwater from adjacent ares. <br /> An audible alarm system, triggered by a liquid level sensor, shall be <br /> . designed and installed to alert an attendant if the ta�k fills to 95 <br /> percent capacity. <br /> 4.7.5.3.2.IINDF1tGRODND STORAGE TANK OVHtFILL YROTBGTION SYSTE?[ <br /> A spill catchment basin shall be provided which surrounds the <br /> underground storage tank's fill pipe, prevents the inflow of the <br /> stored substance into the subsurface environment, and drains minor <br /> overfills into the' underground tank once volume becomes available. <br /> An audible alarm system, triggered by a liquid level sensor, shall be <br /> designed and installed to alert the tanker operatot when the tank has � <br /> '�� � been filled to 95 percent capacity. � <br /> An automatic shut-off device shall be installed that stops the flow <br /> 1�' of product being delivered to the underground storage tank when the <br /> '�' underground tank is full. <br /> 1_' 4.7,5.4. ABOVE-GROi1ND STORACE TANKS <br /> �1 Above-ground storage tanks shall be placed in a bermed, impervious <br /> azea. The bermed area shall be paved with Portland cement concrete <br /> '� for permanent installations. The bermed area shall be large enough, <br /> � and the berms high enough, to contain 110 perce�t of the largest <br /> �1 � tank's total volume or 108 of the total tank volume, whichever is <br /> largest. <br /> 1� An outlet shall be provided from the bermed area co allow drainage of <br /> �1 accumulated rain water. The outlet shall be equipped vith a msnually <br /> operated valve that shall be kept in the closed position except when <br /> � the area is being dr�ined of accuu.ulated rain water. Accumulated <br /> �' rain watez shall be released frequently during the wet scason. <br /> 1 One of the following items shall be installr�d to prevent overfilling <br /> '� oi the tank: an auciible alarm system, triggered by a liyuid levcl <br /> � sensor, to alerc the operacor when the tai�k has been filled to 95 <br /> '�_ - percent capacity; o: an automatic shue-off device that stops the flow <br /> of product being delivered to the storage tank when the tank is full. <br /> IV-10 <br /> 1 ��.2S-e �o r'E�ju� �emcnJ-S � �e no� sa )—is -�� ec� <br /> �— ���� �"he G� e9 �yn o-� rthe �"an �c -�u �e p�ov ;cfe� . <br /> a �cl rnusi- b e me�'. J� • �/13)93 <br />