Agenda - Parks and Recreation Commission - 04/10/2014

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Recommended guidelines for total coliform control are: • maintenance of detectable disinfectant residual throughout the distribution system; • proper repair/replacement/maintenance of the distribution system. According to an article in the American Water Works Association, "water systems that do not disinfect and do not carry a disinfection residual in their distribution system must carefully consider their security vulnerabilities because they do not have a disinfection residual that would guard against microbial contamination from whatever source."1 7. Ground Water Rule In May 2000, the proposed Federal Ground Water Rule was published. The rule utilizes a multiple barrier structure to guard against microbiological contamination. The four major components include (1) periodic on-site inspections; (2) source water monitoring for sensitive aquifers without treatment or with other risk indicators; (3) requirement for correction of significant deficiencies; and (4) requirement for treatment when deficiencies are not or cannot be corrected. Universal disinfection is not required, although systems vulnerable to contamination may be required to disinfect. The City of Ramsey pumps it's well water from Ironton -Galesville aquifer formation, which is located above the Mount Simon -Hinckley aquifer. Water produced from the Ironton -Galesville has been tested and the water retention time testing has determined that the water appears to have entered the aquifer after 1954. According to the Minnesota Department of Health, these types of aquifers are considered relatively susceptible to contamination form surface activities. 8. Drinking Water Contaminant Candidate List (DWCCL) Although not regulated at this time, the Drinking Water Contaminant Candidate List (DWCCL) contains contaminants and contaminant groups that are known or anticipated to occur in public water systems. This list was published in March 1998 and is included in Appendix B1 as Table 1. There are 60 contaminant candidates included on this list. In May 2000, a second list (Table 2) of 12 regulatory determination priorities was developed from the overall contaminant 'Regulatory Compliance Planning to Ensure Water Supply Safety, Potias, W. Frederick, Journal AWWA, 94:3, March 2002. City of Ramsey, Minnesota — M21.34343 Page 4-4 Water System Study Prepared by Bolton & Menk, Inc.