Orange County NC Website
Browse       Search
casing to the top. <br /> e. Wells constructed in unconsolidated formations shall be completely <br /> filled with grout by introducing it through a pipe extending to the <br /> bottom of the well that can be raised as the well is filled. <br /> f. Wells constructed in consolidated rock formations or that penetrate <br /> zones of consolidated rock may be filled with grout, sand, gravel or <br /> drill cuttings within the zones of consolidated rock. The top of any <br /> sand, gravel or cutting fill shall terminate at least 10 feet below the top <br /> of the consolidated rock or five feet below the bottom of casing. Grout <br /> shall be placed beginning 10 feet below the top of the consolidated <br /> rock or five feet below the bottom of casing in a manner to ensure <br /> complete filling of the casing, and extend up to the land surface. For <br /> any well in which the depth of casing or the depth of the bedrock is not <br /> known or cannot be confirmed, the entire length of the well shall be <br /> filled with grout up to the land surface. <br /> 3. For bored wells or hand dug water supply wells constructed into <br /> unconsolidated material: <br /> a. The well shall be disinfected in accordance with Section II (Q) of these <br /> Rules. <br /> b. All plumbing or piping in the well and any other obstructions inside <br /> the well shall be removed from the well. <br /> c. The uppermost three feet of well casing shall be removed from the <br /> well. <br /> d. All soil or other subsurface material present down to the top of the <br /> remaining well casing shall be removed, including the material <br /> extending 12 inches or greater outside of the well casing; <br /> e. The well shall be filled to the top of the remaining casing with grout, <br /> dry clay, or material excavated during construction of the well. If dry <br /> clay or material excavated during construction of the well is used, it <br /> shall be emplaced in lifts no more than five feet thick, each compacted <br /> in place prior to emplacement of the next lift. <br /> f. A six-inch thick concrete grout plug shall be placed on top of the <br /> remaining casing such that it covers the entire excavated area above <br /> the top of the casing, including the area extending 12 inches or greater <br /> outside the well casing. <br /> g. The remainder of the well above the concrete plug shall be filled with <br /> grout or soil. <br /> 4. All wells other than water supply wells, including temporary wells, <br /> monitoring wells, or test borings: <br /> a. Less than 20 feet in depth that do not penetrate the water table shall be <br /> abandoned by filling the entire well up to land surface with grout, dry <br /> clay, or material excavated during drilling of the well and then <br /> compacted in place; <br /> 39 <br />