Specifications include, but are not limited to: A. Tucson Water requires all well casing and well screen to be fabricated of stainless steel meeting ASTM standard 778 for the manufacture of Type 304L stainless steel.B. Tucson Water requires all well casing and well screen to meet applicable National Sanitation Foundation (NSF) Standard 14-84 or the most recent revision for potable water wells. C. A manufacturer’s letter of product certification shall be provided documenting and verifying the composition of the casing purchased, and shall be provided at or prior to the time of casing is delivery. D. Well casing specifications (shall be specified on a job-by-job basis): Wall thickness of 0.312 inch to 0.375 inch Diameter of 12 to 24 inches, but 20 inch must be available Must come with welding collars (minimum 4 inch) E. Well screen specifications (shall be specified on a job-by-job basis): Wall thickness of 0.312 inch to 0.375 inch Diameter of 12 to 24 inches, but 20 inch must be available Louvered (shutter type) with a slot length of 158 -inch or 2 58 -inch depending on the specified casing diameter Louvers (shutters) vertical spacing shall be from ½ -inch to 2 -inches, but one inch spacing must be available Slot size may vary, but 0.080 inch slot size must be available Must come with welding collars (minimum 4 inch).