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1 • • <br />' (d) The existing extent of pollution or the maximum extent of pollution to be tolerated <br />as a goal; <br />' (e) Whether the pollutant arises from natural sources; <br />' (f) Beneficial uses of water; and <br />(g) Such information as may be available to the Commission regarding the risk <br />associated with the pollutants including its persistence, degradability, the usual or <br />' potential presence of the affected organism in any waters, the importance of the <br />affected organisms, and the nature and extent of the effect of the pollutant on such <br />organisms. <br />' (3) Granting, Extending, and Removing Temporarv Modifications to Numeric Standards <br /> Where a numeric standard is not being met at the present time, or there is significant <br /> uncertainty regarding the appropriate long-term underlying standard, a temporary <br /> modification to the numeric standard may be granted by the Commission. The presence <br /> of a modification will be indicated by adding the words "temporarily modified" to the <br />' underlying numeric standard. A temporary modification may be granted to an entire <br /> stream or water body or to any portion thereof. It may be granted at the time a numeric <br /> standard is assigned or at any later time. When the temporary modification expires or is <br />' removed by the Commission, the underlying numeric standard will be in full effect. In <br /> every case, the modification to the numeric standard shall be temporary. All temporary <br /> modifications must be re-examined not less than once every three (3) years. <br /> <br /> In general, requests for a temporary modification are preferred over a more permanent <br /> downgrading of a present classification where it appears that the conditions causing the <br /> lower water quality might be temporary within a twenty (20) year time frame. Retaining a <br />' classification higher than the present usage will serve as a reminder that the conditions <br /> are correctable and may increase the priority for funding to attain the classified use. <br />' (a) Conditions for Granting a TemporaN Modification <br /> The Commission may grant a temporary modification if one of the following <br />' conditions is shown to exist: <br /> (i) where the standard is not being met because ofhuman-induced conditions <br /> deemed correctable within a twenty (20) year period, such as: <br /> - nonpoint source pollution which cannot be currently controlled using best <br />' management practices (BMP) or point source pollution which cannot be <br /> controlled using techniques required by the state and federal Acts but where <br /> adequate strategies may become feasible; <br />' - existing dams or other hydrological modifications that may be removed or <br /> operated in such a manner as to satisfy the standards; <br /> <br />' <br /> 14 <br />C <br />