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Mountain Coal and Bear Coal Water Quality Assessment CO-0038776 and CO-0044377 <br />station were available for a period of record from Apri12001 through September 2002. No fecal <br />coliform data were available from any upstream station and therefore a compazable watershed was <br />used. Specifically, fecal coliform data for the USGS station 09124500 (Lake Fork of the Gunnison <br />River at Gateview, CO) were available for the period ofrecord from December 1990 through August <br />1993 and were determined to be representative of the fecal coliform water quality upstream of the <br />Mountain Coal and Beaz Coal W WTFs. Data from these sources were combined and used to reflect <br />upstream water quality. These data are summarized in Table A-6. <br />Table A-6 <br />Ambient Water Quality for the North Fork of the Gunnison River <br />t'arartteter a (~°amptes ~,rercer <br /> Tem °C 50 <br /> H su) 9 <br /> Fecal Coliform (#/100 <br />ml <br />12 <br /> Hardness (mg/1 CaC03) <br />3 <br /> Al, Dis u ) 3 <br /> As, Tot (u ) 3 <br /> Cd, Dis u 3 <br /> Cr Tot u 16 <br /> Cr Dis u '9 <br /> Cu, Dis u ) 3 <br /> Fe, Tot u I 4 <br /> Fe. Dis (ue/D 4 <br />8.1 <br />181 41 200 1 <br />43 53 <br />15 50 <br />0 0 <br />~ID Np <br />0 4.D <br />NDI NDI NDI 5.11 3 <br />2111 2801 707 <br />IPh_ Tnt (up/11 I 31 0.121 0.401 0.541 0.331 NAI I <br />~Mn, Dis (ug/1) ~ 3~ 0~ 0~ 4.2~ 2.0~ 50~ 2 ~ <br />1H0. Tnt (ue/11 3 ND ND ND ND 0.010 3 <br />~Zn, Dis (ug/1) ~ ~ 0 0 I 0 68 2 <br />NH, Tot (me/11 45 0 0.030 0.12 0.065 NA 2 <br />(Note 1: The calculated mean is the geometric mean. Note that for summarization purposes, the value of one was used where there was nod <br />detectable amount because the geometric mean cannot be calculated using zero. <br />Note 2: When satt~le results were below detection levels, the value of zero was used in accordance with the CO WQCD's standard approach fo <br />Note 3: For the noted parameters, data were found a[ less than detection levels. The detection levels, however, were greater than the in-stream <br />standards. In accordance with WQCD standard procedures, no detetminatlon of water quality is made when detection levels are greater than in- <br />Sylvester Gulch, West Sylvester Gulch, the Drv Fork of Minnesota Creek, and Lone Pine <br />Gulch: The ambient water quality was not assessed for Sylvester Gulch, West Sylvester Gulch, the <br />Dry Fork of Minnesota Creek and Lone Pine Gulch because the background in-stream low flow <br />condition is zero upstream of the Mountain Coal WWTFs' dischazges. <br />Appendix A Page 9 of 20 Last Revised 3/9/2004 <br />