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4.10.1.1. The surface seal shall be monolithically poured on thoroughly <br /> compacted earth, shall have a minimum thickness of four <br /> inches above grade, shall be free from cracks or other defects <br /> and is contiguous with the annular seal. <br /> 4.10.1.2. The surface seal shall be graded to allow drainage to flow away <br /> from the well casing in all directions. <br /> 4.10.1.3. The surface seal shall extend a minimum of 2 feet in all <br /> directions. <br /> 4.10.1.4. The well casing shall extend a minimum of 1 inch above the <br /> concrete surface seal for an individual domestic water well. <br /> 4.10.2. To seal existing wells: An evaluation of the condition of an existing well <br /> will be made by the Director to determine the best method of constructing <br /> a surface seal on a site specific basis. <br /> 4.10.3. A minimum of 48 hours setting time shall be required on Bentonite well <br /> seals before a concrete surface is installed around the well casing. <br /> 4.10.4. Any subsidence of the annular seal shall be replaced with an approved <br /> grout sealing material prior to pouring the concrete surface seal. <br /> 4.11. SANITARY SEAL <br /> 4.11.1. When the pump is mounted directly over the casing, a grout or mastic <br /> seal shall be provided to make a watertight joint between the pump and <br /> the concrete surface seal. <br /> 4.11.2. All holes in the base of the pump which open directly into the well shall be <br /> sealed. <br /> 4.11.3. The seal shall be shaped to prevent retention of water or other foreign <br /> materials. <br /> 4.12. SOUNDING TUBE AND AIR VENT PIPE <br /> 4.12.1. If a sounding tube or access pipe is required, they shall be installed <br /> through the surface seal and welded flush with the inside of the casing or <br /> secured by a mechanical means approved by the Director. <br /> 4.12.1.1. The upper end shall be provided with a watertight threaded <br /> cap. <br /> EHD 43-03 Page 14 of 27 WELL STANDARDS <br /> 10/9/07 <br />