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If a. Thermoplastics. This material shall (b) ASTM C76, "Standard Specification meet the requirements of ASTM F480, "Standard Specification for Reinforced Concrete Culvert, for Thermoplastic Water Well Casing Pipe and Couplings Made Storm Drain, and Sewer Pipe". in Standard Dimension Ratios (SDR)" including the latest revision thereof. SDR is the ratio of pipe diameter to (c) AWWA C300, "AWWA Standard for wall thickness. Reinforced Concrete Pressure Pipe Steel Cylinder Type, for Water and b. Thermosets. This material shall meet Other Liquids". the requirements of the following specifications including the. latest revisions thereof: (d) AWWA C301, "AWWA Standard for Prestressed Concrete Pressure Pipe, (1) ASTM D2996, "Standard Specifica- Steel Cylinder Type, for Water and tion for Filament Wound Reinforced Other Liquids". Thermosetting Resin Pipe". 5. Other materials, except as listed in , (2) ASTM D2997, "Standard Specifica- No. 6 below, may be used as casing for water wells, subject tion for Centrifugally Cast to the approval of the enforcing agency. Reinforced Thermosetting Resin Pipe". 6. Galvanized sheet metal pipe ("downspout"), or natural wood shall not be used as casing. (3) ASTM D3517, "Standard Specifica- tion for Reinforced Plastic Mortar B. Installation of Cas' All casing shall be Pressure Pipe". placed with s ficient care to avoid damage to casing sections and joints. All joints in the casing above the (4) AWWA C950, "AWWA Standard for perforations or screens shall be watertight. The uppermost Glass FiberTReinforced perforations shall be at least below the depth specified in Thermosetting Resin Pressure Pipe". Section 9, Part A, "Depth of Seal". Casing shall be equipped with centering guides to ensure even thickness of annular c. All plastic casing used for community seal and/or gravel pack. water supply wells and individual wells shall meet the provisions of National Sanitation Foundation Standard No. 14 1. Metallic casing. Steel casing may be for Plastic Piping System Components and Related Materials.,?/ joined by either welding or by threading and coupling. Welding shall be accomplished in accordance with standards of d. Plastic casing should not be stored in American Welding Society or the most recent revision of the direct sunlight or subjected to freezing temperatures for American Society of Mechanical Engineers Boiler Construction extensive periods of time. Further, it should be stored so Code. Where casing is driven, as is generally the case when as to prevent sagging or bending. the cable tool method of construction is used), the casing shall be equipped with a "drive shoe" at the lower end. 4. Concrete pipe used for. casing should conform to the following specifications, including the latest 2. Plastic (non-metallic) casing. Depending revision thereof: on the type of material and its fabrication, plastic casing may be joined by solvent welding or mechanically joined (a) ASTM C14, "Standard Specifications (threaded or otherwise coupled). The solvent cement used for for Concrete Sewer, Storm Drain, solvent welding shall meet the specifications for the type of and Culvert Pipe". plastic used and shall be applied in accordance with the manufacturer's instructions,particularly those pertaining to setting time required for the joint to develop handling strength. An adapter shall be used to join plastic casing to Certain sizes of ABS and PVC plastic pipe products made in metallic casing or screen. Schedule 40 and 80 (and others) wall thicknesses corres- pond to or overlap some of the sizes described in 1 Such as wrought iron, asbestos cement pipe, and synthetic ASTM F480. However, this does not mean that they are woods, all of which have been successfully employed as equivalent products. They are classified in ASTM F480 as well casing s ecials referencing ASTM Specifications D1527 casing it California or elsewhere. Their present use is (for ABS pipe and ASTM D1785 and D2241 (for PVC pipe). limited to special cases. Specifications for most of NSF Standard No. 14 includes the requirements of ASTM F480 these materials are published ti either ermoASTM or ticAWW c described in paragraph a, preceding. 1 Information about the installation of thermoplastic casing will be found in Manual on the Selection and Installation of Thermoplastic Water Well Casing", a joint publication of the National Water Well Association and the Plastic Pipe Institute.