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'" -'" Table l6b: Designated use impairment toxic pollutants. Colorado Intensity of Designated Use Impairment Water Quality Information Biologicellnformation Direct ObservationlProfessional Judgement FULLY SUPPORTING: Designated uses An acute water quality standard is The designated uses of the weter body The water body Is being used 88 are not measurably impaired due to exceeded in not more than one sample are not impaired due to water quality, and designated. based on observation, and water quality. in the previous three year period and the data indicate full supporting of aquatic professionsl judgement indicates no mean of all the samples is less than the life use, including survival. propagation. reason why it should not be. chronic standard. production. dispersion. community structure, species diversity within the limits of the physical habitat. WATER QUAliTY UMrrED, ALLOCATED A chronic weter quality standard is The designated uses of the water body are Water quality based effluent limits, which (WQlAI: Designated uses not measurably exceeded in two or more samples in the not impaired, but data indicators indicate a may include an approved wasteload impaired due to water quality, but the past three years, but acute standard probable downward trend that may impair allocation. aTe in effect on the segment. assimilative capacity of the segment has exceeded more than once in tha last three aquatic life including survival. propagation, been allocated. If additional growth occurs years. the mean is less than the chronic production, dispersion, community structure in the areas served by the current treatment standard. and all dischargers are meeting and/or species diversity. facilities or an additional wastewater plant the limits specified in their permits. will discharge to the same more restrictive limits will be required for some or all dischargers. WATER QUAUTY UMITED (WQl): A chronic water quality standard is The designated uses of the water body are The segment has been identified as in Designated uses not measurably impaired exceeded in two or more samples in the not impaired, but data indicators indicate a need of study through a 208 plan, a site due to water quality but assessment past three. years,..but an acute water quality.. . probable downward trend .that may impair , application process, or a State. permitting information or segment specified water standard is not exceeded more than once aquatic life including survival, propagation, process; OR population or industrial siting quality based oontrols indicate the in the same period. and the mean is less production, dispersion, community structure increases indicate a probable downward potential for impairment of the designated than the chronic standard. OR the data and/or species diversity. trend in water quality which may laad to uses in the near future. indicate a downward trend toward impairment of uses in the absence of deteriorations in water quality which could additional management. impair usels). PARTIAL SUPPORT: Some interference An acute water quality standard is The designated uses of the water body are The use exists in the water body based on with designated uses, but use is not exceeded in two or more samples in the present. but it is uncertain that these are at observation, but professional judgement, precluded. past three years, but the mean measured attainable lovels. or some impact on the which may be based on limited data. value is less than the chronic standard. uses has bean noted. indicates that the uses are not fully supported. NOT SUPPORTING: Designated uses An acute water quality standard is There is some certainty that the body can No evidence exists that the entire water measurably impairad because of water exceeded in two or more samples in the not be fully used as designated becausa body can be used as designated; or pollution. Use may be present but at previous three years and the mean the survival, propagation, production known or suspected water quality impacts significantly reduced levels from full measured value is .above the chronic dispersion. community structure, or species prevent anything but minimal use of all or support in all or some portion of the water standard. diversity of aquetic life is impaired. a mejor portion of the water body. body. Taken from Colorado Water Quality Control Division 1992