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f � <br /> with suitable sealing material and the remainder of the well shall be filled <br /> with suitable fill, or sealing material. (See Figure 9A, of Bulletin 74- 81.) <br /> 2. Well penetrating several aquifers or formations. In all cases the upper 20 <br /> feet of the well shall be sealed with impervious material. <br /> In areas where the interchange of water between aquifers will result in a <br /> significantLo e'2 deterioration of the quality of water in one or more <br /> aquifers, or will result in a loss of artesian pressure, the well shall be filled <br /> and sealed so as to prevent such interchange. Sand or other suitable <br /> inorganic material may be placed opposite the producing aquifers and other <br /> formations where impervious sealing material is not required. To prevent <br /> the vertical movement of water from the producing formation, impervious <br /> material must be placed opposite confining formations above and below the <br /> producing formations for a distance of 10 feet or more. The formation <br /> producing the deleterious water shall be sealed by placing impervious <br /> material opposite the formation, and opposite the confining formations for <br /> a sufficient vertical distance (but no less than 10 feet) in both directions, or <br /> in the case of"bottom" waters, in the upward direction. (See Figure 9B.) <br /> In locations where interchange is in no way detrimental, suitable inorganic <br /> material may be placed opposite the formations penetrated. When the <br /> boundaries of the various formations are unknown, alternate layers of <br /> impervious and pervious material shall be placed in the well. <br /> 3. Well penetrating creviced or fractured rock. If creviced or fractured rock <br /> formations are encountered just below the surface, the portions of the well <br /> opposite this formation shall be sealed with neat cement, sand-cement <br /> grout, or concrete. If these formations extend to considerable depth, <br /> alternate layers of coarse stoneN111e'3 and cement grout or concrete may be <br /> used to fill the well. Fine grained material shall not be used as fill material <br /> for creviced or fractured rock formations. <br /> 4. Well in noncreviced, consolidated formation. The upper 20 feet of a well in <br /> a noncreviced, consolidated formation shall be filled with impervious <br /> material. The remainder of the well may be filled with clay or other suitable <br /> inorganic material. <br /> 5. Well penetrating specific aquifers, local conditions. Under certain local <br /> conditions, the enforcing agency may require that specific aquifers or <br /> formations be sealed off during destruction of the well. <br /> C. Placement of Material. The following requirements shall be observed in placing <br /> fill or sealing material in wells to be destroyed: <br /> 1. The well shall be filled with the appropriate material (as described in <br /> Subsection D of this section) from the bottom of the well up. <br /> 2. Where neat cement grout, sand-cement grout, or concrete is used, it shall be <br />