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

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facilities. Elevated levels of alpha emitters often result in elevated levels of radium 226/228 and therefore, both analyses are being conducted. 4. Radon Rule On November 2, 1999, USEPA published a proposed regulation for radon in drinking water. The issuance of the final rule has been delayed and is expected to be finished in year 2003. The proposed MCL for radon is 300 pCi/L. An alternative MCL (AMCL) is proposed at 4,000 pCi/L provided that the State or utility implements a multimedia mitigation (MMM) program to lower exposure to indoor -air -radon. A MMM program must meet four criteria: 1) the public must be involved in development of the program, 2) quantitative goals must be set to remediate existing homes and build new homes radon -resistant, 3) strategies must be identified for achieving these goals, and 4) results must be tracked and reported. An important consideration is how to define and measure quantitative goals for achieving an equal or greater risk reduction through an MMM program as compared with treating drinking water to meet the MCL. 5. Disinfection and Disinfection By -Products (D/DBP's) In December 1998, the USEPA established maximum residual disinfectant levels for water systems that use a chemical disinfectant. The maximum residual disinfectant level is 4.0 mg/1 of chlorine as free C12. The compliance date for groundwater systems is November 2003. Maximum limits have been established to limit the health effects of disinfectant by-products. 6. Total Coliform Rule USEPA promulgated a total coliform rule on June 29, 1989. This rule applies to both surface water supplies as well as groundwater supplies. The total coliform rule became effective December 31, 1990. A presence/absence approach is now used to determine compliance with the coliform MCL. The Maximum Contaminant Level Goal (MCLG) is zero. In general, coliforms must be absent in at least 95 percent of samples. Compliance is determined on a monthly basis. City of Ramsey, Minnesota — M21.34343 Page 4-3 Water System Study Prepared by Bolton & Menk, Inc.