§ 109.1305. Compliance monitoring.
(a) Chemical disinfection. Groundwater systems demonstrating at least 4-log treatment of viruses using chemical disinfection shall monitor for and maintain the Department-approved residual disinfection concentration every day the system serves the public from the groundwater source.
(1) A groundwater system serving greater than 3,300 people shall:
(i) Continuously monitor the residual disinfectant concentration at the entry point or other location approved by the Department and record the results at least every 15 minutes each day that water from the groundwater source is served to the public.
(ii) Maintain the Department-approved minimum residual disinfectant concentration every day the public water system serves water from the groundwater source to the public.
(iii) Conduct grab sampling every 4 hours until the continuous monitoring equipment is returned to service if there is a failure in the continuous monitoring equipment and notify the Department within 24 hours of the equipment failure that grab sampling is being conducted. Grab sampling or manual recording may not be substituted for continuous monitoring for longer than 5 working days after the equipment fails unless a longer period of time is approved by the Department.
(2) A groundwater system serving 3,300 or fewer people shall comply with one of the following subparagraphs:
(i) The groundwater system shall maintain the Department-approved minimum residual disinfectant concentration every day the public water system serves water from the groundwater source to the public. The groundwater system shall take a daily grab sample at the entry point or other location approved by the Department during the hour of peak flow or at any other time specified by the Department. If any daily grab sample measurement falls below the Department-approved minimum residual disinfectant concentration, the groundwater system shall take follow up samples every 4 hours and record the results until the residual disinfectant concentration is restored to the Department-approved minimum level.
(ii) Monitor the disinfectant residual concentration continuously and meet the requirements of paragraph (1).
(b) Alternative treatment. Groundwater systems demonstrating at least 4-log treatment of viruses using a Department-approved alternative treatment method, including a combination of treatment methods shall:
(1) Monitor the alternative treatment in accordance with all Department-approved monitoring requirements.
(2) Operate the alternative treatment in accordance with all compliance requirements that the Department determines to be necessary to achieve at least 4-log treatment of viruses.
Authority The provisions of this § 109.1305 amended under section 4(a) of the Pennsylvania Safe Drinking Water Act (35 P.S. § 721.4(a)); and section 1920-A(b) of The Administrative Code of 1929 (71 P.S. § 510-20(b)).
Source The provisions of this § 109.1305 adopted December 24, 2009, effective December 26, 2009, 39 Pa.B. 7279; amended August 17, 2018, effective August 18, 2018, 48 Pa.B. 4974. Immediately preceding text appears at serial pages (383530) to (383531).
Cross References This section cited in 25 Pa. Code § 109.1302 (relating to treatment technique requirements); 25 Pa. Code § 109.1306 (relating to information describing 4-log treatment and compliance monitoring); and 25 Pa. Code § 109.1307 (relating to system management responsibilities).
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