HAR §11-20-46. grab sampling every four hours may be conducted in lieu of continuous monitoring, but for no more than five working days following the failure of the equipment

If at any time the residual disinfectant concentration falls below 0.2 mg/l in a system using grab sampling in lieu of continuous monitoring, the supplier shall take a grab sample every four hours until the residual disinfectant concentration is equal to or greater than 0.2 mg/l. (iii) Beginning April 1, 2016, HPC must be measured at least at the same points in the distribution system and at the same time as total coliforms are sampled, as specified in sections 11-20-9.1(d) and (e). The director may allow a public water system which uses both a surface water source or a GWUDI source, and a ground water source to take HPC samples at points other than the total coliform sampling points if the director determines that such points are more representative of treated (disinfected) water quality within the distribution system. Residual disinfectant concentration should also be measured for operational control. (e) Reporting and recordkeeping requirements. (1) A public water system that uses a surface water source or a GWUDI source shall comply with any interim reporting requirements, as specified by the director to minimize risk to human health and welfare, until filtration is in place. 20-236 3376 1 §11-20-46 (2) When a public water system that uses a surface water source or a GWUDI source and provides filtration treatment, the supplier shall report monthly to the director the information specified in this paragraph beginning June 29, 1993, or when filtration is installed, whichever is later. (A) Turbidity measurements as required by subsection (d)(2)(B)(i) shall be reported within ten days after the end of each month the system serves water to the public. Information that shall be reported includes: (i) The total number of filtered water turbidity measurements taken during the month. (ii) The number and percentage of filtered water turbidity measurements taken during the month which are less than or equal to the turbidity limits specified in subsection (c) for the filtration technology being used. (iii) The date and value of any turbidity measurements taken during the month which exceed 5 NTU. (B) Disinfection information specified in subsection (d)(2) shall be reported to the director within ten days after the end of each month the system serves water to the public. Information that shall be reported includes: (i) For each day, the lowest measured residual disinfectant concentration in mg/l in water entering the distribution system. (ii) The date and duration of each period when the residual disinfectant concentration in water entering the distribution system fell below 0.2 mg/l and 20-237 3376 §11-20-46 when the director was notified of the occurrence. (iii) The following information on the samples taken in the distribution system in conjunction with total coliform monitoring pursuant to subsection (b): the number of routine total coliform samples collected and the number of instances in which HPC is more than 500 per milliliter. (iv) For the current and previous month the system serves water to the public, the value of "V" in the following formula: $$\frac{V = b \times 100}{a}$$ where a = the number of routine total coliform samples collected, b = the number of instances in which HPC is more than 500 per milliliter. (C) (i) Each supplier, upon discovering that a waterborne disease outbreak potentially attributable to that water system has occurred, must report that occurrence to the director as soon as possible, but no later than by the end of the next business day. (ii) If at any time the turbidity exceeds 5 NTU, the system must consult with the State as soon as practical, but no later than 24 hours after the exceedance is known, in accordance with the public notification requirements under section 11-20-18(c)(2)(C). 20-238 3376