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5. WELL COVER a. During construction of the well , or before the pump is installed , or while repairs are being made, or if for any other reason the top of the well casing is exposed , it must be protected from foreign objects or contamination entering the well by use of a seal or cover. 6. INSTALL=ON OF CASING a. Damage to the casing section and joints is to be avoided during installation. The joints must be structurally sound and water tight. Size and thickness of the casing shall be as shown on the drawings . 7 . PERFORATION a. The perforating of casing should not unduly weaken or deform the casing. The casing shall not be perforated within fifty (50) feet of the ground surface if the total depth of the well is greater than fifty (50) feet . The upper most ;perforation shall be below an impervious stratum in an aquifer of good quality water. 8'. WELL DIEVMORNITNT �. Developing, re-developing or conditioning of a well shall be accomplished by a method that will not cause damage to the ground water aquifer. Care shell be exercised to prevent occurrence of adverse subsurface conditions that may destroy barriers to the vertical movement of water, thus permitting exchange of water between aquifers . 9. SOUNDING T'JRE AND AIR V;ilT PIPE a. A sounding tube or access pipe shall be installed throu�-n the surface seal and welded flush with the inside of the casing. The upper end shall be provided with a water .tight screw cap. b. The fill pipe on a gravel packed well shall be water tight at the ground surface and provided with a grater tight screw cap. c. If a commercially produced sanitary seal is used, a sounding tube will not be reauired -if the sanitary seal is designed with a means of entrance into the well for chlorinating and sounding. 10. SA,dPLING TAP a. Ylithin three (3) feet of the pump on the discharge line , a tap shall be installed for the purpose of obtaining water for laboratory examination. See drawing for details . (42)