Ala. Admin. Code r. 335-9-1-.05
Current through Register Vol. 43, No. 1, October 31, 2024
Section 335-9-1-.05 - MaterialsAll materials used in the construction of a water well shall have the structural strength to accomplish the purpose for which they are installed.
(a) Casing and liners shall be new steel of a minimum wall thickness of Schedule 30 or thermoplastic water well casing produced in accordance with ASTM Standard F 480-76, and approved for potable water by the National Sanitation Foundation (NSF). Nonporous concrete pipe shall be acceptable when grouted to a depth of 20 feet below land surface, and the grout shall be introduced at the bottom until it overflows at the top or by gravity flow. The grout shall consist of 50% cement and 50% aggregate. The upper 20 feet of the hole diameter shall be at least 4-inch larger than the O.D. of the concrete casing. All steel casing is to be welded, or threaded and coupled; thermoplastic casing shall be joined in accordance with ASTM Standard F 480-76.(b) Screen, where required, shall provide adequate open area to transmit the desired amount of water from the formation and shall be sized to retain the sand or other extraneous material that would make the completed well undesirable. It shall be constructed of a material that will not be subjected to serious attack by the chemical action of the water in the formation in which it is placed. Thermoplastic screens shall be approved by NSF for potable water uses.(c) When required, grout shall consist of a ratio of one sack of Portland cement to a maximum of six gallons of clean water.(d) Capping of the well shall be such that no contamination can enter the well.(e) Disinfection of every well shall be accomplished by adding a strong chlorine solution such as HTH, Prechlorine, or Chlorox, so as to subject the entire well to a 50 ppm solution for at least 12 hours. It is strongly recommended that all drilling fluids be chlorinated with at least 50 ppm chlorine. Gallons 5 1/4% 10% Sodium 30% Chlorine 70%
Water_ ChloroxHypochloriteLime____ HTH
50 6.5 oz 3.5 oz 1 oz .5 oz
100 13 oz 7 oz 2 oz 1 oz
500 63.5 oz 33 oz 11 oz 5 oz
1,000 127 oz 67 oz 22 oz 10 oz
Remember -- There are 16 oz/lb and 32 fl oz/qt.
(f) No materials may be used in the construction of a well that will result in the delivery of water that is toxic or has an objectionable odor or taste.(g) Any person desiring to use materials that are not approved herein shall submit the specifications for the materials to the Board for approval before they are used in any well. Author:
Ala. Admin. Code r. 335-9-1-.05
Statutory Authority:Code of Ala. 1975, § § 22-22A-5 (1984), 22-22A-8 (1984), 22-24-3(d) (1984).