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Table 16a: Designated use impairment conventional pollutants. Colorado a, w Intensity of Designated Use Impairment Water Quality Information Biological Information Direct Observation/Professional Judgement FULL V SUPPORTING: Designated uses The water quality standard is exceeded The designated uses of the water body The water body is being used as are not measurably impaired due to in not more than 10% of the analyses and are not Impaired due to water quality. and designated. based on observation. and water quality. the mean measured value is less than the data indicate full supporting of aquatic professional judgement indicates no standard. life. including survival. propagation. reason why It should not be. production. dispersion. community structure. species diversity within the limits of the physical habitat. WATER QUALITY LIMITED. ALLOCATED The water quality standard is exceeded in The designated uses of the water body are Water quality based effluent limits. which (WQLA): Designated uses not measurably 10-15% of the analyses and the mean not impaired. but data indicators indicate a may include an approved wasteload Impaired due to water quality. but the measured value is less than the standard probable downward trend that may impair allocation. are in effect on the segment. assimilative capacity of the segment has and the dischargers are all meeting their aquatic life including survival. propagation. been allocated. If additional growth occurs permit limits for conventional pollutants. production. dispersion. community structure in the areas served by the current treatment and/or species diversity. facilities or an additional wastewater plant will discharge to the same more restrictive limits will be required for some or all dischargers. WATER QUALITY LIMITED (WQl): The water quality standard is exceeded in The designated uses of the water body are The segment has been identified as in Designated uses not measurably impaired 10-15% of the analyses and the mean not impaired. but data indicators indicate a need of study through a 208 plan, a site due to water quality but assessment measured value is less than the standard probable downward trend that may impair application process. or a State permitting information or segment specified water or data indicate a trend of deteriorating aquatic life including survival. propagation. process; OR population or industrial siting quality based controls indicate the water quality which could impair uses. production. dispersion. community structure increases indicate a probable downward potential for impairment of the designated and/or species diversity. trend in water quality which may lead to uses in the neat future. impairment of uses in the absence of additional management. PARTIAL SUPPORT: Some interference The standard is exceeded in 15-25% of the The designated uses of the water body are The use exists in the water body based on with designated uses. but use is not analyses and the mean measured value present. but it is uncertain that these are at observation. but professional judgement, precluded. is less than the standard: OR the standard attainable levels. or some impact on the which may be based on limited data, is exceeded in not more than 15% of the uses has been noted. indicates that the uses are not fully analyses and the mean measured value supported. exceeds the standard. NOT SUPPORTING: Designated uses The standard is exceeded in more than There is some certainty that the body can No evidence exists that the entire water measurably impaired because of water 25% of analyses and mean measured not be fully used as designated because body can be used as designated: or pollution. Use may be present but at value is less than the standard; OR the the survival, propagation, production known or suspected water quality impacts significantly reduced levels from full standard is exceeded in not more than 15% dispersion. community structure, or species prevent anything but minimal use of all or support in all or some portion of the water of the analyses and the mean measured diversity of aquatic life is impaired. a major portion of the water body. body_ value exceeds the standard. Taken from Colorado Water Quality Control Division 1992 o <=> ~ (;...'1 c..'1 I:~