(1) Records. In addition to the requirements of WAC 246-290-480, the purveyor shall keep the following records:

(a) Records of corrective actions. For each action, records shall be kept for at least ten years.

(b) Records of public notification as required under WAC 246-290-71005 (4) and (5) and shall be kept for at least three years.

(c) Records of invalidation of groundwater source samples under WAC 246-290-320 (2)(g)(vii), and shall be kept for at least five years.

(d) For consecutive systems, records of notification to the wholesale system of total-coliform positive routine samples that are not invalidated under WAC 246-290-320 (2)(d), and shall be kept for at least five years.

(e) For all systems that are required to perform compliance monitoring under WAC 246-290-453:

(i) Records of department-specified minimum disinfectant residual, and shall be kept for at least ten years.

(ii) Records of the lowest residual disinfectant concentration, and the date and duration of any failure to maintain the department-prescribed minimum residual disinfectant concentration for a period of more than four hours, and shall be kept for at least five years.

(iii) Records of department-specified compliance requirements for membrane filtration and of department-specified parameters for department-approved alternative treatment, and shall be kept for at least five years.

(iv) Records of the date and duration of any failure to meet the membrane operating, membrane integrity, or alternative treatment operating requirements for more than fours hours, and shall be kept for at least five years.

(2) Reporting. In addition to the requirements of WAC 246-290-480:

(a) Systems conducting compliance monitoring under WAC 246-290-453(2) must notify the department any time the system fails to meet department-specified requirements as soon as possible, but no later than the next business day, for the following requirements:

(i) Minimum residual disinfectant concentration;

(ii) Membrane operating criteria or membrane integrity; and

(iii) Alternative treatment operating criteria, if operation in accordance with the criteria or requirements is not restored within four hours.

(b) The system must notify the department within thirty days of completing corrective action under WAC 246-290-453(1).