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PHS - South Platte WQCD Exhibit 38-5 <br />June 2009 Reg 38 RMH Clear Creek Basin Rationale <br />companies conduct river trips in this segment. <br />Point Sources: COG588055, Central Clear Creek Sanitation District <br />Water Quality: The Division assessed water quality data from CDOW Station SP0943, Clear Creek Site 4 above <br />Idaho Springs (10/28/2002 through 6/24/2003); CDOW Station SP0956, Clear Creek Site 5 Riverside Park <br />(10/28/2002 through 6/24/2003); RW Station 3613, Clear Creek at Idaho Springs (9/26/2006 through 4/30/2007); <br />RW Station 3630, below Spring Gulch (10/23/2002 through 4/30/2007); RW Station 3631, Clear Creek above Idaho <br />Springs (10/28/2002 through 4/30/2007); UCCWA Station CC-32, Clear Creek above the confluence with Trail <br />Creek (3/9/2006 through 8/19/2008); UCCWA Station CC-33, Clear Creek below the confluence with Trail Creek <br />(3/9/2006 through 10/19/2006); and, UCCWA Station CC-34, Clear Creek above Chicago Creek (4/1/2003 through <br />8/19/2008). Water quality data are in WQCD Exhibit 15. <br />Exceedances: The TVS values are for a mean hardness of 83.5 mg/1. The following parameters are not attaining <br />chronic TVS based upon assessment of the data available from the period of record: cadmium, copper, manganese, <br />and zinc. The following parameters are not attaining acute TVS: cadmium, copper, and zinc. <br />The manganese standard for segments that are designated for water supply is either 50 µg/1 or existing quality as of <br />January 1, 2000. Although the 85`h percentile of manganese data exceeds 50 gg/l, it is reasonable to interpret that <br />the manganese levels are not worse than existing quality as of January 1, 2000. <br />Zn (ug/1) at CC-26 and WQCD 5646, Clear Creek at Lawson <br />(above Mill Creek), 1998-2008 <br />250 <br />200 <br />150 <br />' Zn <br />100 ?yr -.*-Zn (ch) TVS <br />----Zn (ac) TVS <br />50 Y <br />0 <br />CP OZ O, 59 61;15 (Z" 9J) 4& O? "Zi '100 10 <br />12