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4.0 COMPLETION OF WELL CONSTRUCTION <br /> 4.1 Final Cleanup <br /> After completion of all well tests, the Contractor will remove the test <br /> pumping equipment. The Contractor will then sound the well, and, if necessary, <br /> bail it clean of all loose material. The Contractor will then secure the well by tack- <br /> welding a steel plate on the top of the casing. <br /> The Contractor will restore all areas used for mud pits, percolation points, <br /> or other uses to their original conditions and levels. <br /> 4.1.1. Concrete Slab <br /> A three-foot by three-foot by two-foot above grade (3' x 3' x 2') concrete <br /> surface pad will be constructed at the well head. The pad will slope away from <br /> the well. See drawing presented in Appendix B showing completed well head <br /> arrangement for reference. <br /> 4.1.2 Disinfection <br /> After the well has been completely constructed, it shall be thoroughly <br /> cleaned of all foreign substances, including tools, timbers, rope, debris of any <br /> kind, cement, oil, grease, and scum. The casing pipe shall be thoroughly <br /> swabbed, using alkalis if necessary, to remove oil, or grease. The well shall then <br /> be disinfected with chlorine solution. <br /> The chlorine solution used for disinfecting the well shall be of such volume <br /> and strength and shall be so applied that a concentration of at least 50 ppm of <br /> chlorine shall be obtained in all parts of the well. Chlorine solution shall be <br /> 18 <br />