EXH0359021263

PCHBPollution Control Hearings Board of the State of Washington

173-201A-0_ Title 173 WAC: Ecology, Department of tDa_. ._[{ flo_' I,, ...... I. _" II'._. Cascades Ecoregion: I v''u'c'_= V' ...... ;_ ' Troplfic State IfAmbient TP (pg/1) _ _.oun Rvpor_rRange of Lake is: should be set at: Ultra-oligotrophic 0-4 4 or less Oligo,n'ophic :>4-10 10orless Action value , , >10 ,.,,,,.. lake specific study may be initiated. Columbia Basin Ecore_ion: Trophic State If Ambient TP _g/l) Then criteria Range of Lake is: should be set at: Ultra-oligotrophic 0-4 4 orless Oligotrophic >-I-10 [0orless Lower mesotrophic > 10-20 20 or less Uppermesotrophic >20-35 35 or less Action valpe _.>35 ..... lake specific study may be initiated. Lakes in the Willamette, EastCascade Foothills. or Blue technical information and stakeholder input as partof a pub- Mountain ecoregions do not have recommended values and lic involvement process equivalent to the Administrative Pro- need to have lake-specific stu&es in order to receive criteria eedure Act (chapter 34.05 RCW), as described in (c)(i) of this subsection. (iii) Determine if the proposed total phosphorus criteria (b) The following actions are recommended if ambient necessary to protect characteristic uses is achievable. If the monitoring of a lake shows the epilimnetic total phosphorus recommended critenon is not achievable and if the character- concentration, as shown in Table l of this section, is below istic use the criterion is intended to protect is not an existing the action value for an ecoregion: use, then a higher criterion may be proposed in conformance (i) Determine trophic status from existing or…
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