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After development , the bottom of the well shall be sand-pumped to remove all sand , silt, and material from the casing. Within 24 hours after the urell has been developed water samples shall be taken and analyzed by a State Certified Laboratory as to physic-1 and chemical characteristics . All work: on the well shall be suspended until the results of these tests are analyzed by the Engineer. B. Disinfection After the well has been completely constructed and developed , it shall be thoroughly cleaned of all foreign substances , including tools , timbers , rope , debris of any kind , cement , oil ,grease, joint done and scum. The well shall then be disinfected with. a chlorine solution. It may be added , if desired , while the test pump is Mill in place and the well surged to help distribute the chlorine solution. The chlorine solution used for disinfecting the well shall be of such volume and strength and shall be so applied that a concentration of at least 50 parts per million of chlorine shall be obtained in all parts of the well water. The chlorine solution shall remain in the well for at least two hours.. Upon completion of the well, the top of the casing shall be capped 13 inches above grade by means of a cap or steel plate of proper size securely fastened or spot-welded in place. C . Construction 1. WELL GROUTING AND CONSTRUCTION The primary purpose is to prevant •contamination, pollution and degradation of water wells and of the ground water by poor quality water. a. The annular space between the well casing and the wall of the drilled hole or between the conductor pipe and the wall of the drilled hole or the well casing shall be filled with cement grout or puddled clay from the ground surface into an impervious formation underlaying the uppermost aquifer. If an impervious formation does not exist , the annular space shall be filled to a sufficient depth to prevent polluted or contaminated water from entering the well. The minimum depth of the annular seal shall be as follows : Public Water supplies - - - - - - - - - - - - - 5Oft. Individual Domestic 'dells - - - - - - - - - - - 50ft. industrial ''ells - - - - - - - - - - - - - - - 50-ft. Agric.iltural '.,'ells - - - - - - - - - - - - - - a" Air Conditioning "Tells - - - - - - - - - - - - 20ft . (40)