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DEPARTMENT OF HFr9LTTl, Water Quality Control Division <br />No. I -Rationale -Page 2. Permit No. CO-0027146 <br />2. Clarsificnlian: This stream segment is classified jor the following uses: Use Protected; Recreation, Class <br />2; Aquatic Life, Cars 2 (warm J; Agriculture. <br />3. Numeric Standards: The standards which have been assigned in accordance with the above classifications <br />watt be found in 3.7.0, Class cations and Numeric Standards jor the Lower Colorado River Basin (5 CCR <br />1002-8J, as amended September 7, 1993. Ir should be noted that the intntediate rereiving wafer, segment <br />13, has no metals standards. The neat stream segmem with metals standards is the Colorado River, <br />segment 2. The low flow of the Colorado River m this point is 1086 cfs, the maximum flow from omjall <br />QLS-is0.28 ds. This results in a worse case dilution ratio of 3878:1. On this basis, there would not be <br />an impact from this dtsdtarge on segment 2 water quality standards. <br />4. Amideeradation Review: Since the rcttiving water is Use Protected, an amidegradatian review is nor <br />required pursuam to section 3.1.8(1)(6) of The Basic Standards and Merhodolories for Sarface Water. <br />B. Receiving Water Dula <br />Quanrirv. Acute and Chronic Law Flows: 7)u flows which wiU be used !o calculate acute and chronic <br />ejjluem limitations are the one day in three year low flow (lE3J and the 30 day in three year low flow <br />(30E3J respectively. Those flaws have been determined for the unnamed tributary to the Colorado River <br />by the Water Quality Comrol Division, and are as jolbws (all flows in cubic jeer per second): <br />Acute and Chronic Low Flaws <br />,:,. <br />.:.. A.catr;: :.....:.:.; :.:; ...: ChYoniq..::..:..: <br />Mnual 0 <br />V. <br />TERMS AND CONDITIONS OF PERMIT <br />A. Dete~minationojEjfluetuLimitations <br />Effluent Limitations: The following limitations will apply to new aurfa11015 and are discussed in following <br />sections. <br />Table V-1 - EjJluenl Limitations For Ou1jaU 015 <br />.. <br />Pairimeter . Lirnltatlan.. :.... :: , '. Rationale <br />Flow, MGD Report Design Capacity <br />7SS, mg/P 35/70 b/ Federal BAT <br />Oi! and Grease, mg/P 10 c/ Stale Efflluem Regulations <br />pN, s. u. 6.5-9.0 d/ Water Quality S~atulards <br />7DS, mg/P Report Salinity Regulations <br />WET, Acute LCso>700% c/ State Permit Regulations <br />Iron (Total), mg/P 3.5/7.0 b/ Federal BAT <br />a/ 30day average <br />b/ 3aday avcragea)ai(y Manmum <br />c/ Daily Maiirruun <br />d/ Minimum-Maximum <br />