The Scottish Environment Statistics - 1998

5. WATER

Table 5.16 Interpretation of microbiological values for sampling Level of Symbols used Interpretations Faecal Total Faecal pass in this report coliforms coliforms streptococci Pass- G Directive states: 80% of 80% of 90% of samples Guideline samples samples should not should not should not exceed 100 exceed 100 exceed 500 faecal faecal coliforms total coliforms streptococci per 100ml. per 100ml. per 100ml. Based on 20 Must have at Must have at Must have at samples: least 16 least 16 least 18 samples samples with samples with with less than, or less than, or less than, or equal to, 100 faecal equal to, 100 equal to, 500 streptococci faecal total coliforms per 100ml. coliforms per 100ml. per 100ml. Pass- M Directive states: 95% of 95% of The Directive Mandatory samples samples contains no should not should not mandatory exceed 2,000 exceed 10,000 standard for faecal total coliforms faecal coliforms per per 100ml. streptococci. 100ml. Based on 20 Can only have Can only have The Directive samples: 1 sample with 1 sample with contains no greater than greater than mandatory 2,000 faecal 10,000 total standard for coliforms per coliforms per faecal 100ml. 100ml. streptococci. Source:SEPA