Ala. Admin. Code r. 335-7-11-.13

Current through Register Vol. 42, No. 12, September 30, 2024

Section 335-7-11-.13 - Corrosion Control Study

Systems proposing to use a new source or exceeding the lead and copper compliance limit may be required to conduct and submit a corrosion control study to determine the optimum corrosion control process to minimize exposure of lead and copper to the consumers.

(a) Any water system performing a corrosion control study shall evaluate the effectiveness of each of the following treatment processes and if appropriate, any combination of these processes:

1. alkalinity and pH adjustment,

2. calcium hardness adjustment, and

3. the addition of a phosphate or silicate based corrosion inhibitor at a concentration to maintain an effective residual in the distribution system.

(b) The study shall use either a pipe-loop test, metal coupon test, partial system test, or analysis based on documented treatment activities from other water systems with similar water chemistry, similar system size, and same distribution system configuration.

(c) The following water quality parameters shall be measured during the test conducted to allow proper evaluation of the processes:

1. Lead

2. Copper

3. pH

4. Total alkalinity

5. Calcium

6. Conductivity

7. Orthophosphate (when a phosphate inhibitor is evaluated)

8. Silicate (when a silicate compound is evaluated)

9. Water temperature

(d) The study shall identify all chemical or physical constraints that may limit or prohibit the use of a particular corrosion treatment method, identify any previously used corrosion control treatment that was found ineffective, or adversely affected any treatment processes, shall evaluate the effect of the proposed chemicals to be used on the water quality treatment processes demonstrating adequate corrosion control, and shall provide a recommendation of the proposed process to be installed.

(e) Information to be included with the recommended process shall include cost of the proposed installation, equipment to be used including model number and brand, chemical to be added including proposed concentration rate, NSF approval document, and availability information on the chemical and a construction schedule demonstrating the equipment can be operational within 24 months of the study submittal. After review of the recommended process, the Department will determine the optimum corrosion control process and the water quality parameter values. Lead and copper monitoring shall continue each six-month compliance period from the date the parameter values are set.

Ala. Admin. Code r. 335-7-11-.13

Adopted: September 23, 1992; effective November 9, 1992. Amended: Filed November 28, 1995; effective January 2, 1996. Amended: Filed February 6, 2002; effective March 13, 2002. Amended: Filed August 21, 2012; effective September 25, 2012.

Authors: Joe Alan Power

Statutory Authority:Code of Ala. 1975, 22-23-33, 22-22A-5, 22-22A-6.