N.J. Admin. Code § 7:10-9.6

Current through Register Vol. 56, No. 21, November 4, 2024

Section 7:10-9.6 - Additional requirements

(a) Each supplier of water with an existing surface water filtration plant shall install a continuous analyzer/recorder to monitor the turbidity of the combined filter effluent or plant effluent by June 30, 1997 and shall install a continuous analyzer/recorder to monitor the turbidity of the effluent from each individual filter by December 31, 2000.

(b) The supplier of water shall verify the accuracy of performance of each analyzer/recorder required pursuant to (a) above by taking a grab sample of the effluent at least once in every 24-hour period. In the case of analyzer/recorder failure, the supplier of water shall take a grab sample at least once every four hours during the period in which the analyzer/recorder is out of service.

(c) Each supplier of water shall establish and maintain on-site written routine operating procedures for minimizing initial turbidity peaks that occur after filter backwashing.

(d) Any filter removed from service for longer than one week shall be backwashed prior to being placed back into service in order to remove microbiological buildup.

(e) Each supplier of water that uses conventional filtration treatment or direct filtration shall continuously apply a coagulant while the treatment plant is in operation.

(f) For the purpose of complying with the minimum total removal/inactivation requirements of the National Regulations, 40 CFR 141.70, the following total minimum removal/inactivation requirements for disinfection shall apply:

1. For treatment plants that use conventional filtration treatment, the supplier of water shall provide sufficient disinfection to achieve a minimum of 0.5-log (68 percent) inactivation of Giardia cysts and a 2-log (99 percent) inactivation of viruses.

2. For treatment plants that use direct filtration, slow sand filtration and diatomaceous earth filtration, the supplier of water shall provide sufficient disinfection to achieve a minimum of 1-log (90 percent) inactivation of Giardia cysts and a 3-log (99.9 percent) inactivation of viruses.

3. For treatment plants that use filtration technologies other than those specified in (f)1 and 2 above, the Department will determine the minimum disinfection requirements on a case-by-case basis.

(g) The Department may modify the minimum removal/inactivation requirements for disinfection set forth in (f) above if it determines that the removal efficiency of a filtration plant exceeds or is less than optimum based on the results of filtration efficiency studies, conducted at the treatment plant by the supplier of water, that indicate log inactivation of Giardia and viruses.

(h) Each supplier of water shall install a continuous analyzer/recorder on each filtration plant to monitor the disinfectant residual entering the distribution system. The supplier of water shall verify the accuracy of the performance of each analyzer/recorder by taking a grab sample of disinfectant residual at least once in every 24-hour period. In the case of analyzer/recorder failure, the supplier of water shall take a grab sample at least once every four hours during the period in which the analyzer/recorder is out of service.

N.J. Admin. Code § 7:10-9.6

Amended by R.2000 d.354, effective 8/21/2000.
See: 31 N.J.R. 2717(b), 32 N.J.R. 3106(a).
In (a), rewrote the last sentence.