<div class="chunk-title">Sec. 34-19. - Prohibition.</div>
<div class="chunk-content">
            <p class="incr0">
               (a)
               </p>
            		
            <p class="content1">
               <span class="ital">Storage capacity of 500 gallons or more within 1,000 feet.</span> It shall be unlawful for any person to store flammable and/or combustible liquids
               and/or gases in any aboveground container of a capacity of 500 gallons or more within
               1,000 feet of the property line of any school in the county.
               </p>
            		
            <p class="incr0">
               (b)
               </p>
            		
            <p class="content1">
               <span class="ital">Storage capacity in excess of 500 gallons within 2,000 feet.</span> It shall be unlawful for any person to store flammable and/or combustible liquids
               and/or gases in any aboveground container in excess of 500 gallons within 2,000 feet
               of the property line of any school in the county unless the following provisions as
               they relate to diking and venting are followed:
               </p>
            		
            <p class="incr1">
               (1)
               </p>
            		
            <p class="content2">
               <span class="ital">Diking.</span> Such system shall comply with the following:
               </p>
            		
            <p class="incr2">
               a.
               </p>
            		
            <p class="content3">
               A slope of not less than one percent away from the container shall be provided for
               at least 50 feet or to the dike base, whichever is less.
               </p>
            		
            <p class="incr2">
               b.
               </p>
            		
            <p class="content3">
               The volumetric capacity of the diked area shall not be less than the greatest amount
               of liquid that can be released from the largest tank within the diked area, assuming
               a full tank. To allow for volume occupied by tanks, the capacity of the diked area
               enclosing more than one tank shall be calculated after deducting the volume of the
               tanks, other than the largest tank, below the height of the dike.
               </p>
            		
            <p class="incr2">
               c.
               </p>
            		
            <p class="content3">
               To permit access, the outside base of the dike at ground level shall be no closer
               than ten feet to any property line that is or can be built upon.
               </p>
            		
            <p class="incr2">
               d.
               </p>
            		
            <p class="content3">
               Walls of the diked area shall be of earth, steel, concrete or solid masonry designed
               to be liquid-tight and to withstand a full hydrostatic head. Earthen walls three feet
               or more in height shall have a flat section at the top not less than two feet wide.
               The slope of an earthen wall shall be consistent with the angle of repose of the material
               of which the wall is constructed. Diked areas for containers located in extremely
               porous soils may require special treatment to prevent seepage of hazardous quantities
               of liquids to low-lying areas or waterways in case of spills.
               </p>
            		
            <p class="incr2">
               e.
               </p>
            		
            <p class="content3">
               Except as provided in subsection (b)(1)f of this section, the walls of the diked area
               shall be restricted to an average height of six feet above interior grade.
               </p>
            		
            <p class="incr2">
               f.
               </p>
            		
            <p class="content3">
               Dikes may be higher than an average of six feet above interior grade where provisions
               are made for normal access and necessary emergency access to tanks, valves and other
               equipment, and safe egress from the diked enclosure.
               </p>
            		
            <p class="incr3">
               1.
               </p>
            		
            <p class="content4">
               Where the average height of the dike is over 12 feet high, measured from interior
               grade, or where the distance between any container and the top inside edge of the
               dike wall is less than the height of the dike wall, provisions shall be made for normal
               operation of valves and for access to tank roofs without entering below the top of
               the dike. These provisions may be met through the use of remote operated valves, elevated
               walkways or similar arrangements.
               </p>
            		
            <p class="incr3">
               2.
               </p>
            		
            <p class="content4">
               Piping passing through dike walls shall be designed to prevent excessive stresses
               as a result of settlement of fire exposure.
               </p>
            		
            <p class="incr3">
               3.
               </p>
            		
            <p class="content4">
               The minimum distance between containers and toe of the interior dike walls shall be
               five feet.
               </p>
            		
            <p class="incr2">
               g.
               </p>
            		
            <p class="content3">
               Each diked area containing two or more containers shall be subdivided, preferably
               by drainage channels or at least by intermediate curbs, in order to prevent spills
               from endangering adjacent containers within the diked area.
               </p>
            		
            <p class="incr2">
               h.
               </p>
            		
            <p class="content3">
               Where provision is made for draining water from diked areas, such drains shall be
               controlled in a manner so as to prevent flammable or combustible liquids from entering
               natural watercourses, public sewers, or public drains, if their presence would constitute
               a hazard. Control of drainage shall be accessible under fire conditions from outside
               the dike.
               </p>
            		
            <p class="incr2">
               i.
               </p>
            		
            <p class="content3">
               Storage of combustible materials, empty or full drums or barrels, shall not be permitted
               within the diked area.
               </p>
            		
            <p class="incr1">
               (2)
               </p>
            		
            <p class="content2">
               <span class="ital">Venting.</span> Normal venting of all aboveground containers shall be as follows:
               </p>
            		
            <p class="incr2">
               a.
               </p>
            		
            <p class="content3">
               Atmosphere storage containers shall be adequately vented to prevent the development
               of vacuum or pressure sufficient to distort the roof of a cone roof container or exceeding
               the design pressure in the case of other atmosphere containers as a result of filling
               or emptying, and atmospheric temperature changes.
               </p>
            		
            <p class="incr2">
               b.
               </p>
            		
            <p class="content3">
               Normal vents shall be sized either in accordance with: the American Petroleum Institute
               Standard No. 2000, Venting Atmospheric and Low-Pressure Storage Tanks, (5th Edition,
               1998); or withdrawal connection, whichever is larger, but in no case less than 1Â¼
               inch nominal inside diameter.
               </p>
            		
            <p class="incr2">
               c.
               </p>
            		
            <p class="content3">
               Low-pressure containers and pressure vessels shall be adequately vented to prevent
               development of pressure or vacuum, as a result of filling or emptying, and atmospheric
               temperature changes, from exceeding the design pressure of the container. Protection
               shall also be provided to prevent overpressure from any pump discharging into the
               container when the pump discharge pressure can exceed the design pressure of the container.
               </p>
            		
            <p class="incr2">
               d.
               </p>
            		
            <p class="content3">
               If any container has more than one fill or withdrawal connection and simultaneous
               filling or withdrawal can be made, the vent size shall be based on the maximum anticipated
               simultaneous flow.
               </p>
            		
            <p class="incr2">
               e.
               </p>
            		
            <p class="content3">
               The outlet of all vents and vent drains or containers equipped with venting to permit
               pressures exceeding 2.5 psig shall be arranged to discharge in such a way as to prevent
               localized overheating of, or flame impingement on, any part of the container, in the
               event vapors from such vents are ignited.
               </p>
            		
            <p class="incr2">
               f.
               </p>
            		
            <p class="content3">
               Containers storing combustible and/or flammable liquids and/or gases shall be equipped
               with venting devices which shall be normally closed except when venting to pressure
               or vacuum conditions.
               </p>
            		
            <p class="incr0">
               (c)
               </p>
            		
            <p class="content1">
               <span class="ital">Emergency venting.</span> Emergency venting of all aboveground containers shall be as follows:
               </p>
            		
            <p class="incr1">
               (1)
               </p>
            		
            <p class="content2">
               Every aboveground container shall have some form of construction or device that will
               relieve excessive internal pressure caused by exposure fires.
               </p>
            		
            <p class="incr1">
               (2)
               </p>
            		
            <p class="content2">
               In a vertical container, the construction may take the form of a floating roof, lifter
               roof, a weak roof-to-shell seam, or other approved pressure relieving construction.
               The weak roof-to-shell seam shall be constructed to fail preferential to any other
               seam.
               </p>
            		
            <p class="incr1">
               (3)
               </p>
            		
            <p class="content2">
               Where entire dependence for emergency relief is placed upon pressure relieving devices,
               the total venting capacity of both normal and emergency vents shall be enough to prevent
               rupture of the shell or bottom of the container if vertical, or of the shell or heads
               if horizontal. If unstable liquids are stored, the effects of heat or gas resulting
               from polymerization, decomposition, condensation, or self-reactivity shall be taken
               into account. Such device may be a self-closing manhole cover, or one using long bolts
               that permit the cover to lift under internal pressure, or an additional or larger
               valve or valves.
               </p>
            		
            <p class="historynote0">
               (Ord. of 9-19-1978, Â§ I)
               </p></div>