Ambient Water Quality Criteria for Bacteria - Water Quality Standards ...

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11-30-2011 Key Implementation Points: Geo Mean and SSM Geometric mean is value most closely linked to the illness rates Single Sample Maximum was not intended to be used as a “not to be exceeded” value
Geo Mean and SSM in BEACH Act Waters Must have both Geo Mean and SSM for all waters designated for primary contact rec Must use SSM for beach closure and advisory programs States have flexibility to: Adopt some or all of the SSMs Describe the applicability of the SSM for the various CWA purposes in their standards Do not have situations where neither Geo Mean nor SSM apply Federal promulgation does not include minimum sample size requirements for calculating the Geo Mean.
Page 1 and 2: 11-30-2011 Ambient Water Quality Cr
Page 3 and 4: 11-30-2011 Indicators EPA’s reco
Page 5 and 6: 11-30-2011 Results of Studies in th
Page 7 and 8: 11-30-2011 Bacteria Criteria in Wat
Page 9 and 10: 11-30-2011 Primary Contact Recreati
Page 11 and 12: 11-30-2011 What is the BEACH Act?
Page 13: Risk Levels 11-30-2011 Key Implemen
Page 17 and 18: 11-30-2011 Uses of the SSM Beach a
Page 19 and 20: EPA’s New/Revised Criteria Object
Page 21 and 22: 11-30-2011 Revising the Rec Criteri
Page 23 and 24: Current Thinking on the Draft RWQC
Page 25 and 26: Current Thinking on the Draft RWQC
Page 27: Take Home Messages EPA’s current

Ambient Water Quality Criteria for Bacteria - Water Quality Standards ...

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