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TCAP = 25° C cold water aquatic life species absent <br />FPH= 1; Where 8<pH<_9 <br />FPH = 1 + 10(7.4-PH): <br />1.25 Where 6.5:5 pH <_ 8 <br />FPH means the acute pH adjustment factor, defined by the above formulas. <br />FT Means the acute temperature adjustment factor, defined by the above formulas. <br />T means temperature measured in degrees celsius. <br />TCAP means temperature CAP, the maximum temperature which affects the toxicity of ammonia to <br />salmonid and non-salmonid fish groups. <br />NOTE. If the calculated acute value is less than the calculated chronic value, then the calculated <br />chronic value shall be used as the acute standard. <br />(5) Unless the stability of the chromium valence state in receiving waters can be clearly demonstrated, <br />the standard for chromium should be in terms of chromium Vl. In no case can the sum of the <br />instream levels of Hexavalent and Trivalent Chromium exceed the water supply standard of 50 NgA <br />total chromium in those waters classed for domestic water use. <br />(6) Selenium is a bioaccumulative metal and subject to a range of toxicity values depending upon <br />numerous site-specific variables. <br />(4) Assessment Criteria <br />The following criteria shall be used when assessing whether a specified waterbody is in <br />attainment of the specified standard. <br />(a) Upper South Platte Segment 6b, Chatfield Reservoir: Assessment Thresholds <br />chlorophyll = 11.2 pg/I, summer average, 1 in 5 year allowable exceedance frequency <br />phosphorus(Tot) = 0.035 mg/I, summer average, 1 in 5 year allowable exceedance <br />frequency. <br />(b) Upper South Platte Segment 16h: Selenium Assessment Locations <br />• Toll Gate Creek (TG6): Downstream of the confluence of East and West Toll <br />Gate Creeks, at 6'h Avenue near the gage station. <br />• East Toll Gate Creek (ETI): Upstream of the confluence with West Toll Gate <br />Creek, at Chambers Road and 1ST Avenue. <br />West Toil Gate Creek (WTI): Upstream of the confluence with East Toll Gate <br />Creek, at 2nd Avenue. <br />(c) Upper South Platte Segment 15 and Middle South Platte Segment 1a: Dissolved Oxygen <br />Assessment Locations <br />For the purpose of determining attainment of the standard, dissolved oxygen <br />measurements shall only be taken in the flowing portion of the stream and at mid depth, <br />and at least six inches above the bottom of the channel. Dissolved oxygen