<div class="chunk-title">Sec. 22-224. - Large diameter wells cased with concrete pipe.</div>
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            <p class="incr0">
               (a)
               </p>
            		
            <p class="content1">
               If the casing joints are not sealed, the construction shall be as follows:
               </p>
            		
            <p class="incr1">
               (1)
               </p>
            		
            <p class="content2">
               The bore hole shall have a minimum diameter of six inches larger than the outside
               diameter of the casing.
               </p>
            		
            <p class="incr1">
               (2)
               </p>
            		
            <p class="content2">
               The annular space around the casing shall be filled with neat cement, sand-cement,
               or concrete grout to a depth of at least 20 feet below land surface.
               </p>
            		
            <p class="incr1">
               (3)
               </p>
            		
            <p class="content2">
               The annular space around the casing below the grout shall be filled with sand or gravel.
               </p>
            		
            <p class="incr1">
               (4)
               </p>
            		
            <p class="content2">
               The gravel-pack shall have a minimum thickness of at least three inches.
               </p>
            		
            <p class="incr1">
               (5)
               </p>
            		
            <p class="content2">
               The gravel-pack material shall be composed of quartz, granite, or similar rock material
               and shall be clean, rounded, uniform, water-washed and free from clay, silt, or other
               deleterious material.
               </p>
            		
            <p class="incr1">
               (6)
               </p>
            		
            <p class="content2">
               The gravel shall be disinfected before or during the installation with a solution
               containing at least 100 parts per million (mg/l) of residual chlorine.
               </p>
            		
            <p class="incr0">
               (b)
               </p>
            		
            <p class="content1">
               If the casing joints are sealed, the construction shall be as follows:
               </p>
            		
            <p class="incr1">
               (1)
               </p>
            		
            <p class="content2">
               The bore hole shall have a minimum diameter of six inches larger than the outside
               diameter of the casing to a depth of at least 20 feet below land surface.
               </p>
            		
            <p class="incr1">
               (2)
               </p>
            		
            <p class="content2">
               The annular space around the casing shall be filled with neat or sand-cement grout
               to a depth of at least 20 feet below surface as required for other water-supply wells.
               </p>
            		
            <p class="historynote0">
               (Ord. of 8-9-93, Â§ V(e))
               </p></div>