WSP06423 - Laserfiche WebLink

Home Browse Search

~ water quali,ty criteria have not been adopted, these narrative ~ water quality criteria shall be implemented considering ~ appropriat~ information, including any criteria guidance issued U1 by EPA under CWA ~ 304(a) and/or information in EPA's toxicity ~ databases. For substances where numeric criteria have not been adopted for the public water supply use, these narrative water quality criteria shall be implemented considering any drinking water criteria or health advisories issued by EPA under the Safe Drinking Water Act. Point source discharge implementation of (A) (4) shall result in appropriate whole effluent toxicity (WET) limitations as described in the latest edition of the EPA Region VIII NPDES Whole Effluent Toxics Control Program document. VI NARRATIVE BIOLOGICAL CRITERIA (A) Criteria Reservation waters shall be free from substances, whether attributable to human-induced point source discharge or nonpoint s~urce'activities, in concentrations or combinations which would impair the aquatic community. 1 ~ , ~ ~ ~ " ~ (B) purpose and Implementation The intent of the Tribe in adopting a narrative biological criteria is solely to provide an additional assessment tool that can be used to identify impaired surface waters. At this point in time, regulatory or enforcement actions based solely on the Tribe's narrative biological criteria, such as development and enforcement of NPDES permit limits, are not authorized. However, biological assessment information may be used in combination with other information, for example, to assist in determining whether existing permits are fully protecting designated uses and to assist in determining whether new or revised chemical-specific permit limitations are needed. In addition, the scope of how the Tribe's narrative biological criterion is used may change in the future as the Tribe becomes more experienced and confident in its biological assessment program. I~plementation shall be based on comparison of current biological: conditions at a particular site to the conditions deemed attainable based on an appropriate reference site or condition. In all cases appropriate sampling and analysis techniques shall be used, consistent with the Tribe's Quality Assurance Project Plan (QAPP). 1 ~ ~ ~ ~ .~ ~ j ~ J ~. :~ .- A 1 VII DESIGN~TED USES Section 131.10 of 40 CFR requires that the Tribe consider assigning aquatic life, recreation, and other designated uses j .~ i ,.~ ., ~ : ~ ;'~ 1 ~ 1 , "1 j 7 .