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For a substance classified by the United States Environmental Protection Agency as a Group A or Group <br /> B carcinogen, either the concentration corresponding to a risk of one additional case of cancer per <br /> 100,000 adults consuming the water over a lifetime, as estimated by the United States Environmental <br /> Protection Agency and the Minnesota commissioner of health, or the recommended allowable limit <br /> under unit(a),whichever is lower. <br /> (6) <br /> If a substance which has a standard or an alternative standard under subitems (2)to (5) is present in <br /> ground water at a facility, and if the recommended allowable limit or the concentration corresponding <br /> to the one-in-100,000 cancer risk under subitem (5) is changed,the commissioner may establish <br /> alternative limits for that substance. The alternative limits shall be 25 percent of the concentration given <br /> in subitem (5), unit(a) or(b),whichever is applicable. <br /> 1. <br /> If a substance is not detected in a sample and the limit of detection is higher than the intervention limit <br /> or standard for that substance, the intervention limit or standard will not be assumed to have been <br /> attained or exceeded. <br /> J. <br /> The commissioner, after investigation and evaluation, may require the owner or operator to implement <br /> the facility contingency action plan and to take corrective action under the following circumstances, <br /> even if a standard or intervention limit established under this subpart is not being exceeded: <br /> (1) <br /> in the event of a substantial release of leachate that the commissioner may reasonably expect to result <br /> in a violation of water quality standards; or <br /> (2) <br /> based on the additive carcinogenicity or toxicity of a combination of pollutants in the ground water, in <br /> lieu of the limits for individual substances under items E, F, and H.The additive carcinogenicity or <br /> toxicity must be computed using the approach given in "Guidelines for the Health Risk Assessment of <br /> Chemical Mixtures," Federal Register,Volume 51, pages 34014-34025, September 24, 1986. Where <br /> quantification using this approach is feasible,the commissioner may require response actions if the sum <br /> total risk of consuming the water over a lifetime would exceed either 2.5 additional cases of cancer in a <br /> population of 1,000,000 persons or for noncarcinogens, 25 percent of the acceptable concentration for <br /> long-term consumption. <br />