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ASTH standard that best describes the chemical <br /> makeup of the stainless steel casing that is <br /> intended for .use in the construction, of the well: <br /> (F) Stainless steel easing shall have a minimum <br /> wall thickness that is equivalent to standard <br /> schedule number lOS. <br /> (G) Casing weighing less that "standard weight" <br /> accel pipe ia not recommended for water-supply <br /> wells. However. steel casing of six and <br /> five-eights inches diameter weighing less than <br /> "standard weight" steel pipe will be permitted <br /> if the following requirements are met: <br /> (~) The o~rner prefers casing weight less than <br /> "standard weight" steel pipe. <br /> (2) The casing shall have a minimum weight of <br /> 13 pounds per fooC when <br /> threaded <br /> coupled. <br /> (3) The casing shall have a minimum nominal <br /> wall thickness of 0.185 inches. <br /> (6) The casing shall meec the requirements for <br /> water ~ell casing pipe of ASTH-A589-70 <br /> <br />Grouting <br />(1) The casing in wells in which the producing zone <br /> underlies zones containing non-potable water shall <br /> be grouted from land surface to the top of the <br /> producing zone or first impervious layer having a <br /> thickness of at least 10 feet above the producing <br /> <br />(2) The casing in all other wells shall be grouted from <br /> land surface to a depth of at least 20 feet. <br />(3) The cement Stout shall be placed around the casing <br /> by one of the following <br /> (A) Pressure. The annular space between the casing <br /> and the formation Shall be minimum of 1.5 <br /> inches. Cement grout shall be pumped or forced <br /> under pressure through the bottom of the casing <br /> until it fills the annular area around the <br /> casing and overflows at the surface. <br /> (B) Pumping. The annular space between the casing <br /> and formation shall be minimum of 1.5 inches. <br /> Cement grout shall be pumped into place throush <br /> a hose or pipe extended to the bottom of the <br /> annular space which can be raised as the grout <br /> is applied. The grout hose or pipe should <br /> remuin submer~ed in grout during the entire <br /> application. <br /> (C) Other. The annular space around the casing <br /> shall be a minimum of three incheS. The <br /> annular shall be completely f~lled with space <br /> cement grout by any method that ~lll insure <br /> complete filling of the apace, provided ~hc <br /> <br /> <br />