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<br /> f" ,- r; <br />lu~~' Fecal Streptococci <br /> Total Col Harms Feca 1 Col iforms <br /> (#/100 m1.) (#/100 ml.) (#/100 ml.) <br /> Masters Narrows Mas ters Narrows Masters Narrows <br />Grand Mean 2018 1438 165 139 212 153 <br />Aug.29-0ct. 11 <br />Hean for ,,' <br />Aug. 29- Sept. 26]) 226 128 119 42 137 86 <br /> <br />As can be seen in the above tabulation, the mean values for the entire <br />study (grand means) were considerably greater than the means for the <br />initial weeks of the study (August 29 to September 26). The first <br />several weeks would be the period of the study that would best reflect <br />conditions during the recreation season, as well as during the irriga- <br />tion season. The difference in the two mean values reflects the large <br />increase in the number of bacterial groups present during the October <br />sampl i ngs. <br /> <br />A comparison of the results of the survey with the current water <br />quality standards for the State indicates that samples taken during <br />the late recreation season (August 24-September 26) meet the water <br />qua 1 ity standa rds for total and fecal co 1 Horms. However, the fecal <br />streptococcus standard was not met at any time during the survey. In <br />addition, the coliform standards were also exceeded during October, <br />with the exception of that for fecal coliforms at the Narrows site. <br />Conclusions drawn from the results of the survey were that the proposed <br />reservoir would meet the coliform standards during the recreation <br />season, but not the standard for fecal streptococci. Therefore, on the <br />basis of the current standards, specifically the fecal streptococcus <br />standard, the reservoir could not 'be classified as being suitable for <br />primary contact recreation. <br /> <br />Recently the validity of the use of fecal streptococci as indicators <br />of human fecal contamination has been seriously questioned. This is <br />because of the large number of streptococci of limited sanitary sig- <br />nificance that are propagated on the culture medium. The American <br />Public Health Association (APHA) (1975) and previously the National <br />Academy of Sciences (1973) have recommended that sanitary surveys be <br />conducted when there is evidence of fecal contamination due to the <br />results of fecal streptococci cultures. Since there is evidence of <br />contamination at the reservoir from other than human sources, a sanitary <br />survey has been recommended. <br /> <br />]j Used in the evaluation by the Northeast Colorado Health Department <br />in their letter of October 18, 1977. <br /> <br />18 <br />