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2 . Sealing Mater=al: <br /> Ca. Neat Cement - 1 bag (94 lbs.) Vortland Cement to 5 to 10 <br /> gallons of clean water. <br /> M <br /> b. Cement Grout - Not more than two (2) parts by weight of sand <br /> and one (1) part of cement (per bag of cement) to 5 to 7 gallons <br /> of clean water. <br /> C. Quick setting cement, retardants to setting and other additives, <br /> including hydrated lime, up to lO% of the volume of cement and <br /> bentonite up to 5% may be used. <br /> d. Bentonite clay may be used as sealing material. <br /> 3. In grouting the annular space, the grout shall be applied in one <br /> continuous process, to the initial set when less than 100 sacks <br /> are required. The annular seal shall have a nominal thickness of <br /> two (2) inches. <br /> B. SEALING OFF STRATA <br /> y <br /> 1. Aquifers penetrated that contain poor quality water shall be sealed . <br /> to prevent contamination. Methods shall be reviewed and approved <br /> by the District Health Officer. <br /> C. SURFACE SEAL <br /> 1. A monolithically poured concrete platform shall be constructed <br /> around the top of the well on thoroughly compacted earth, whether <br /> the pump is mounted over the well, offset , or is of a submersible <br /> type. <br /> 2. To seal existing wells : An evaluation of the condition of an exist- <br /> ing well will be made by the District Health Officer, to determine <br /> the best method of constructing a surface seal. <br /> -4- <br />=%t F�hYd.;?:Y,�tf.'!+.•r'1-itir.-ar. i;ra-dl.•3•' i.je-•'r?l•.�fG.�V''�!tt.-r_.4t';.... rtv .-v.•t3�s.^'*_x�v.^_._ iy _. ......_. - <br /> .,�1 ,iyr:P.. t:-�s-•.-'tar�+3r -.. ..fes_. ,y.. <br />