River Boyne Water Quality Management Plan - EPA

River Boync Water Quality Mln~gelncnt PlanAmmonia95percentile limit : equal to or less than 1.0 mg/l N (Totoo95percentile limit : equal 10 or less than 0.02 nzg/l N (m-ionised)50 percentile li~nit : equal to or less than 0.2 nig/l N (Total)Total Oxidised Nitrogen (Nitrate + Nitrite)99.9percentile liniit : equal to or less than I1 nzg/l N95percentile limit : equal. to or less than 5 mg/l Njopercentile limit : equal to or less than 3 nzg/l NOrthophosphate/TotaI PhosphorusThe phosphate standards are set out in Tables 6.1 to 6.3.6'+:It should be noted that the Urban Wastewater Treatment ~irect$&'(91/271) makes specific provisionfor nutrient removal from wastes discharged to waters wfiic&%re eutrophic or are liable to becomeeutrophic. Accordingly, phosphate removal should be &$led for significant effluent discharges (atleast those from WWT plants with design capacity&@i@~~).Mixing ZonesThe standards specified above are appli&&%utside the mixing zone, i.e., the area adjacent to adischarge where initial dilution occurs adwhere receiving waters may not meet in full the qualitycriteria applicable to the receiving W& as a whole. In the mixing zone, where organic wastes areconcerned, the main objective will&; to prevent nuisance and to ensure the passage of fish. Thepermitted extent of the mixing zone will depend on site specific characteristics, such as the strengthof the mixing forces (such as river flow), the exchange rate and the size of receiving water body andwhether other mixing zones are involved.For inspection purposes only.Consent of copyright owner required for any other use.For all discharges, the following criteria should apply to the mixing zone area:.There shozdd be no accumulation ofobjectionable depositsThe waters should be free ofscun~, oil and otherjloating debrisDischarges should norproduce objectio~~able odour, colour, taste or excessive turbidityThe conditions at the ozi@N should not produce objectionable growth of nuisance plants suchas sewage fungusEPA Export 26-07-2013:17:27:02