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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 PiQe. ASTM D2996, Standard Specification <br />for Filament Wound Reinforced Thennosetting Resin Pipe. <br />(2) Centrifugally Cast Resin PiQe. ASTM D2997, Standard Specification <br />for Centrifugally Cast Reinforced Thennosetting 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. AWWAl C950,AWWA <br />Standard for Glass-Fiber-Reinforced Thennosetting-Resin Pressure Pipe. <br />DrinkiQI! Water Su~~ly. 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 />c. <br />Storage. Handlin!!. and TransRortation. 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 />d. <br />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 />e. <br />Unacce~table Casing Materials. Galvanized sheet metal pipe such as 'downspout,' tile <br />pipe, or natural wood shall not be used as well casing. <br />5. <br />Other Materials. Materials in addition to those described above may be used as well <br />casing, subject to enforcing agency approval." <br />6. <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 />.1 American Water Works Association. <br />-25-