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Show Chapter 2 Watershed Characteristics and Uses ANALYSIS COLIFORM Total coliform has not exceeded state standards for use designation Class IC - culinary use with prior treatment ( 5,000 total coliform per 100 milliliters), but there have been occasional exceedences of the standards for 2B - boating and similar uses excluding swimming ( 1,000 total coliform per 100 milliliters). Total coliform counts are normally less than 150 per 100 milliliters ( ml) except for Emigration Canyon, which often exceeds 300 per 100 ml. Regression analysis of coliform data with time, with stream flowrate, and/ or with location in the canyon, failed to produce significant results. A statistical summary of the total coliform data for each canyon is provided in Table 5. Table 5 TOTAL COLIFORM STATIST CSSUM MARY CANYON/ Monitoring Station Period of Coverage Mean Standard Deviation Number of Samples CITY CREEK Treatment Plant Intake CC2 - Below Gate 1960- 1997 1993- 1997 36.2 46 37 41 453 58 EMIGRATION CREEK EC - Above Rotary 1993- 1997 177 181 66 PARLEY'S CANYON Treatment Plant Intake PC1 - Lambs Weir 1992- 1997 1993- 1997 23.1 68.5 29 94 69 68 MILL CREEK MC1 - UB 1988- 1997 50.6 73 198 Page 20 |