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<br />I <br />I TABLE 5.9 <br /> WATER QUALITY AT <br /> NORTH ST. VRAIN CREEK <br />I <br />I pH Alkalinity Hardness Flouride A 1 umi num Manganese Iron <br />Year Month (SU) (Mglll (Mg/l) (Mg/1) (Mg/1) (Mglll ( Mg III <br /> 1986 January 6.7 9.7 5.,6 .15 .05 .01 .08 <br />I February 6.7 9.8 6.2 .16 .05 .01 .10 <br /> March 6.7 11.2 10.2 .15 .05 .02 .12 <br /> April 7.2 13.0 10.4 .15 .06 .03 .14 <br />I May 7.2 11.6 8.9 .16 .06 .03 .12 <br /> June 7.1 8.8 6.1 .17 .10 .02 .15 <br /> July 7.0 5.7 4.5 .29 .11 .02 .07 <br />I August 7.1 5.7 5.1 .04 .04 .02 .12 <br /> September 7.1 7.1 6.8 .21 .05 .03 .16 <br /> October 7.1 8.5 7.8 .20 .03 .01 .10 <br />I November 7.1 9.7 10.1 .12 .02 .01 .09 <br /> December 7.0 10.1 9.2 .19 .03 .01 .08 <br />1987 January 7.0 9.9 10.0 .22 .01 .01 .08 <br /> February 6.9 10.4 16.6 .21 NT .01 .09 <br />I March 7.1 12.5 12.7 .33 .01 .02 .11 <br /> Apri 1 7.2 14.2 15.3 .47 .27 .01 .09 <br /> May 7.2 12.2 14.6 .36 <br />I June 7.0 11.6 12.8 .46 <br /> July 7.1 10.1 9.6 .32 <br /> August 7.3 9.3 10.9 .35 <br /> September 7.2 9.4 9.9 .17 <br />I <br /> AVERAGE 7.0 10.0 9.7 .23 .06 .02 .11 <br />I EPA DRINKING <br />WATER STANDARD 6.5-8.5 150 1. 4-2.4 .05 .3 <br />I NT - NO TRACE <br />I <br />I <br />I <br />I <br />I <br />I -32- <br />