Ground Water Rule

40 CFR 141, Subpart S is incorporated by reference. (7-1-26) 01. Discontinuation of Treatment. PWSs that wish to discontinue four (4)-log virus treatment at a groundwater source must meet the following criteria. Groundwater sources on which treatment has been discontinued will be subject to the triggered source water monitoring requirements of 40 CFR 141, Subpart S. (7-1-26) a. Demonstration that any known source of contamination has been removed. (7-1-26) b. Demonstration that structural deficiencies of the well have been rehabilitated and no longer exist. (7-1-26) c. Provide evidence that the well is drawing from a protected or confined aquifer. (7-1-26) d. Submit results of one (1) year of monthly monitoring for a fecal indicator organism during which no positive results occurred. (7-1-26) 02. Chlorine Purging Prior to Triggered Source Sampling. 40 CFR 141.402(e) requires that groundwater source samples be collected at a location prior to any treatment. Pursuant to this requirement PWSs that add chlorine to a source, either in the well bore or near enough to the wellhead that chlorinated water may backflow into the well, must ensure that all chlorine residual has been purged prior to taking a triggered source water sample. This must be accomplished by measuring chlorine residual in the source water until a reading of zero (0) is obtained and be recorded in the space provided for chlorine residual on the sample submittal form. (7-1-26) 115. ENHANCED FILTRATION AND DISINFECTION - SYSTEMS SERVING FEWER THAN TEN THOUSAND PEOPLE. 40 CFR 141, Subpart T is incorporated by reference. In accordance with 40 CFR 142.16(g)(1), the Department has authority to require the owner of a PWS to conduct a composite correction program, as defined in Section 003, for the purpose of identifying and correcting deficiencies in water treatment and distribution. Composite correction programs consist of a comprehensive performance evaluation (CPE) and comprehensive technical assistance (CTA). (7-1-26) 01. Comprehensive Performance Evaluation (CPE). The CPE is conducted to identify factors that may be adversely impacting a plant’s capability to achieve compliance. It must emphasize approaches that can be implemented without significant capital improvements. The CPE assesses plant performance-based capabilities and associated administrative and operation and management practices. (7-1-26) 02. Comprehensive Technical Assistance (CTA). The CTA consists of follow-up to the CPE results, implementation of process control priority setting techniques, and long-term involvement to systematically train staff and administrators. (7-1-26)