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10. If thermoplastic casing is used: <br /> a. The casing shall be new. <br /> b. The casing and joints shall meet or exceed all the specifications of <br /> ASTM F480-06b, except that the outside diameters shall not be <br /> restricted to those listed in ASTM F480-06b, which is hereby <br /> incorporated by reference, including subsequent amendments and <br /> editions. <br /> c. The depth of installation for a given SDR or Schedule number shall <br /> not exceed that listed in Table I1 unless, upon request of the NC <br /> Department of Environmental Quality, and written documentation <br /> from the manufacturer of the casing stating that the casing may safely <br /> be used at the depth at which it is to be installed is provided. <br /> d. Thermoplastic casing with wall thickness less than that corresponding <br /> to SDR 21 or Schedule 40 shall not be used; <br /> e. For wells in which the casing will extend into consolidated rock, <br /> thermoplastic casing shall be equipped with a coupling, or another <br /> device approved by the manufacturer of the casing, that is sufficient to <br /> protect the physical integrity of the thermoplastic casing during the <br /> processes of seating and grouting the casing and subsequent drilling <br /> operations; and <br /> f. Thermoplastic casing shall not be driven by impact, but may be <br /> pushed. <br /> TABLE II- Maximum allowable depths (in feet) of Installation of Thermoplastic <br /> Water Well Casing <br /> Nominal Diameter Schedule 40 Maximum Schedule 80 Maximum <br /> (inches) Depth (in feet) Depth (in feet) <br /> 6 130 495 <br /> 8 85 340 <br /> 10 65 290 <br /> 12 65 270 <br /> 14 50 265 <br /> 16 50 255 <br /> Maximum Depth Maximum Depth Maximum Depth <br /> for SDR 21 for SDR 17 for SDR 13.5 <br /> (in feet) (in feet) (in feet) <br /> All Diameters 185 355 735 <br /> 11. In constructing any well, all water-bearing zones that contain contaminated, <br /> saline, or other non-potable water shall be cased and grouted so that <br /> contamination of overlying and underlying groundwater zones shall not occur. <br /> 12. The top of the casing shall be terminated at least 12 inches above land <br /> surface, regardless of the method of well construction and type of pump to be <br /> installed. <br /> 13. The casing in wells constructed to obtain water from a consolidated rock <br /> 21 <br />