Section R. 325.1631b - Construction of wells; PVC casing material standardsRule 131b.
(1) PVC pipe that is used as permanent casing shall be new pipe that is in compliance with ASTM specification F 480-90, which is adopted by reference in R 325.1610.(2) Each length of PVC pipe that is used as permanent well casing shall be legibly marked, by the manufacturer, with all of the following information: (a) The nominal pipe size.(b) The standard dimension ratio (SDR).(c) The type of plastic (PVC 1120 or PVC 1220).(d) The wording "well casing."(e) The impact classification (IC).(f) A designation that the pipe is in compliance with the provisions of ASTM specification F 480-90.(g) The manufacturer's name or trademark.(h) The manufacturer's code for resin manufacture.(i) The lot number and date of manufacture.(j) A certification mark that verifies that the pipe is in compliance with the provisions of ANSI/NSF standard 14.(3) Casing pipe that is manufactured from thermoplastic materials other than PVC shall be in compliance with the provisions of ASTM specification F 480-90, which is adopted by reference in R 325.1610, and shall be used only with the written prior approval of the director.Mich. Admin. Code R. 325.1631b