Indiana Administrative Code
Title 327 - WATER POLLUTION CONTROL DIVISION
Article 8 - PUBLIC WATER SUPPLY
Rule 3.4 - Public Water System Wells
Section 3.4-24 - Disinfection procedure requirements
Current through September 18, 2024
Authority: IC 13-14-8; IC 13-15-1-2; IC 13-15-2-1; IC 13-18-3-1; IC 13-18-4-1
Affected: IC 13-11-2; IC 13-13-5-1; IC 13-18-2
Sec. 24.
(a) The disinfection procedures described in this section shall be performed with one (1) of the following approved forms of chlorine:
(b) Gravel installed in a new production well must be chlorinated by use of the following method:
(c) Immediately before placement in the void caused by settled gravel in a well, replacement gravel shall be soaked in a chlorine solution of at least fifty (50) mg/l for a duration not less than thirty (30) minutes during initial construction or subsequent repairs.
(d) Permanent equipment and material used in a production well shall be chlorinated before installation by spraying exposed areas with a solution containing a chlorine residual of not less than two hundred (200) mg/l.
(e) A new or modified well proposed to be a production well shall be chlorinated in accordance with one (1) of the following:
The following table demonstrates the amount of chemical compound needed for chlorination of wells:
Table 24-1 Amount of Chemical Compound Needed for Chlorination of Wells
Well-Hole or Well-Casing Diameter (in.) | Volume per 100 Feet of Water Depth (gal) | Calcium Hypochlorite* (65 percent available Cl2) | Sodium Hypochlorite[DRAGGER] (12 trade percent[DRAGGER]) |
5 | 106.09 | 1.1 oz | 5.65 fl oz |
6 | 146.9 | 1.5 oz | 7.8 fl oz |
8 | 261.1 | 2.7 oz | 13.9 fl oz |
10 | 408.0 | 4.2 oz | 1.4 pt |
12 | 587.5 | 6.0 oz | 2.0 pt |
16 | 1,044.0 | 10.7 oz | 3.5 pt |
20 | 1,632.0 | 1 lb 1 oz | 0.7 gal |
24 | 2,350.0 | 1 lb 8 oz | 1.0 gal |
30 | 3,672.0 | 2 lb 6 oz | 1.5 gal |
36 | 5,287.0 | 3 lb 6 oz | 2.2 gal |
48 | 9,400.0 | 6 lb 1 oz | 3.9 gal |
60 | 11,690.0 | 9 lb 7 oz | 6.1 gal |
Notes:
*Quantities of Ca (OCl)2 based on 65 percent available chlorine by dry weight (16 oz = 1 lb).
[DRAGGER]Quantities of NaOCl based on 12 trade percent available chlorine by U.S. liquid measure (1 gal = 4 qt = 8 pt = 128 fl oz).
[DRAGGER]Trade percent is a term used by chlorine manufacturers; trade percent × 10 = grams of available chlorine in 1 liter of solution.
(f) After disinfection accomplished in accordance with subsection (e), a new or modified public water system production well and a flowing well shall be sampled for the presence of coliform at least twice, with sampling done not less than twenty-four (24) hours apart, by a laborat+ory certified by the Indiana state department of health or the United States Environmental Protection Agency using methods specified in 327 IAC 8-2-8.7. If the presence of coliform is indicated by the sample results, the disinfection of the well shall be repeated.
(g) Disposal of chlorinated water from well disinfection shall be to one (1) of the following sources: