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the grout shall he placed hy either the pumpieg or <br /> <br /> (&) If an outer casing is installed, it shell be grouted <br /> by either the or me,hods. <br /> pumping <br /> pressure <br /> (5) All ErOUt mixtures shall be prepared before <br /> <br /> (6) The well shall be grouted within five working days <br /> after completiom of drilling. <br />(7) The contractor will give written or oral notice to <br /> the Health Director of any grouting to be done. The <br /> no£1ce shall be given az least one (1) day prior ~o <br /> grouting to allo~ the Health Director to inspect the <br /> well before, durimg end after grout is emplaced. <br />Large Diameter Wells Cased With Concrete Pipe <br />(1) If the casing Joints are not sealed, the <br /> <br /> (A) The bore hole shall have a minimum diameter of <br /> <br /> ~he casing. <br /> (B) The annular space around the casing shall be <br /> <br /> concrete grout co a depth of at least 20 feet <br /> below land surface. <br /> (C) The annular space around the casing Below the <br /> grout shall be filled with sand or gravel. <br /> (D) The gravel-pack shall have a minimum thickness <br /> of ac least three inches. <br /> (E) The material shall be of <br /> gravel-pack <br /> <br /> shall he clean, rounded, uniform, wa~er-~ashed <br /> and free from clay, silt, or other deleterious <br /> <br /> (F~ The gravel shall he sterilized before or during <br /> the installation wi~h a soluciom containing at <br /> least 10D parts per million residual chlorine, <br /> or <br />(2) If the casing Joints are sealed, ~he construction <br /> shall he as follows: <br /> (A) The bore hole shall have a minimum diameter of <br /> six inches larger than the outside diameter of <br /> the casing to a depth of at least 20 feet below <br /> land surface. <br /> (B) The annulet space around the casing shall he <br /> filled with neat or sand-cement grout to a <br /> depth of sc least 20 feet Below land surface as <br /> required for o£her water-supply wells. <br />Well Screens <br />(1) The well, if constr~c~ed to obtain water from an <br /> unconsulidated rock formation, shall Be equipped <br /> with a screen £ha~ ~lll sdeqsstsly prevent the <br /> entrance of lnfqrmation material into she yell <br /> after the ~ell has been developed and completed 5y <br /> <br /> <br />