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Thermoplastic well casing that may be subject to significant impact stress <br /> during or after installation shall meet or exceed the requirements for impact <br /> resistance classification set forth in Section 6.5 of ASTM F480. Casing that <br /> may be subject to significant impact forces includes, but is not limited to; <br /> casing that is installed in large diameter,deep boreholes; and casing through <br /> which drilling tools pass following installation of the casing in a borehole. <br /> b. Thermoset Plastics. Thermoset casing material shall meet the following <br /> specifications, as applicable, including the latest revisions thereof- <br /> (1) Filament Wound Resin Pipe. ASTM D2996,Standard Specification ' <br /> for Filament Wound Reinforced Thermosetting Resin Pipe. <br /> (2) Centrifugally Cast Resin Pipe. ASTM D2997,Standard Specification <br /> for Centrifugally Cast Reinforced Thermosetting Resin Pipe. <br /> (3) Reinforced Plastic Mortar Pressure Pipe. ASTM D3517, Standard <br /> Specification for Reinforced Plastic Mortar Pressure Pipe. <br /> (4) Glass Fiber Reinforced Resin Pressure Pipe. AWWAt C950,AWWA <br /> Standard for Glass-Fiber-Reinforced Thermosetting-Resin Pressure Pipe. <br /> C. Drinking Water Supply. All plastic casing used for drinking water supply <br /> wells, including community supply well and individual domestic wells, shall <br /> meet the provisions of National Sanitation Foundation Standard No. 14, <br /> Plastic Piping Components and Related Materials and any revision thereof. The <br /> casing shall be marked or labeled following requirements in NSF Standard <br /> No. 14. Standard No. 14 includes the requirements of ASTM F480. <br /> d. Storage, Handling, and Transportation. Plastic casing shall not be stored in <br /> direct sunlight or subjected to freezing temperatures for extended periods of <br /> time. Plastic casing shall be stored,handled,and transported in a manner that <br /> prevents excessive mechanical stress. Casing shall be protected from sagging <br /> and bending, severe impacts and loads, and potentially harmful chemicals. <br /> e. Large Diameter Wells. Because large diameter plastic casing has not been <br /> used extensively at depths exceeding 500 feet, special care shall be exercised <br /> with its use in deep wells. <br /> 5. Unacceptable Casing Materials. Galvanized sheet metal pipe such as'downspout,'tile <br /> pipe, or natural wood shall not be used as well casing. <br /> 6. Other Materials. Materials in addition to those described above may be used as well <br /> casing, subject to enforcing agency approval." <br /> Subsection B (page 45 of Bulletin 74-81) has been revised as follows: <br /> "B. Casing Installation. All well casing shall be assembled and installed with sufficient care to <br /> prevent damage to casing sections and joints. All casing joints above intervals of perforations <br /> • t American Water Works Association. <br /> -25- <br />