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-�__ � - ���. ��nC(vG�-� .Lf.� e PL:'r'(�� C!9 <br />Ic�REor �����s�e� c�.��� . <br />STORM AND SURFACE WATER <br />High volume use fueling areas shall be paved using Portland cement concrete. <br />The pavement under covered areas shall be graded, or trench or valley drains shall be located at the <br />cuvered azea perimeter along the downhill side(s), to collect runoFf or washwater from the fueling azeas. <br />All collected runoff shall be routed through a spill containment vault with a 50 gallon (minimum) live <br />capacity prior to dischazge to the sanitary sewer. <br />An isolation valve shall be installed in the outlet piping from the spi11 containment vault. Whenever site <br />configuration allows, the valve control shall be an above-ground hand-wheel. lf only a below-ground <br />valve control is feasible, the valve shall still be hand-operable and the lid of the ��alve control box shall be <br />brighUy colored to allow for easy identification. Signs mdicating the lucation and purpose of the valve <br />shall be posted at the fueling islands and at the attendant's station. <br />mat rial�t 1The paveme tsaround the vaul tlid shall be gndep,d or be msed t pre�ent he run-on of �az�ng <br />stormwater from adjacent areas. <br />Concrete-filled, steel pipc: posts (see City Standard No. 510) shall be constructed and located where <br />necessary to prevent vehicles enten g the fueling azea from striking the gasoline pumps. <br />/1 / �/1 � /� i , <br />Eilher spill containment or underground storage tank overfill prevention, as detailed in the following <br />Sections, shall be provided for areas where tanker tnnsport to underground storage tanks occur� <br />4-5.213)(A) SPILL CONTAINMENT V ��-" ��' <br />'f'he`�(ans.�azea sh be gradedTo prevent the run-on of stormwater from adjacent areas. <br />Trench or v�lley drains shall be la:ated at the perimeter of the tanker transfer azea along the downhill <br />side. The drains shall route any runoff or spills through a spill containment structure consisting of a vault <br />or �arge catch basin with 250 gallons of live capacity. The spill containment structure shall dischazge to <br />t!;e storm drainage system. <br />The oudet of the :;pill containment structure shall be equipped with an AFL/Clark Oil Stop valve, or <br />approved equal, ttiat allows passage of water but not of the product being stored in the underground <br />stonge tanks. <br />The lid of the spi.11 containment structure shall be designed to vent vapors to the atmosphere and shall be <br />constructed of non-sparking material. The pavement azound the lid shall be sloped or bermed to prevent <br />the run-on of stormwater from adjacent ueas. <br />An audible darm system, triggered by a liquid level sensor, shall 'oe designed and installed to alert an <br />attendant if the tank fills to �5% capac�ty. <br />4-5.213)(6) UNDERGROUND STORAGE TANK OVER!=1LL PROTECTION <br />A spill catchment basin shall be provided which su:rounds tne underground stora;e tarik's fill pipe, <br />�revents the inflow of the stored substance into the subsurfzce environment, and drains minor ove�lls <br />�nto the underg,iound tank once volume becomes available. <br />Au audible alarm system, triggered by a liquid level sensor, shall be designecl and installed to aleri the <br />tanker operator when the tank has been filled to 95% capacity. <br />STANDARDS 4-5 <br />