The Water Framework Directive (Classification, Priority Substances and Shellfish Waters) Regulations (Northern Ireland) 2015 No. 351

SCHEDULE 5

PART 1 Shellfish Waters Standards

Table 1

Shellfish Water Mandatory Standards

Parameter	Units	Standard
Temperature	◦C	A discharge affecting shellfish waters must not cause the temperature of the water to exceed by more than 2◦C the temperature of the waters not so affected.
pH		pH values will not reach levels outside of the range established so as to ensure the functioning of the ecosystem and the achievement of the values specified for the biological quality elements under Good Ecological Status
Silver	Annual mean (AA-EQS) (µg/l)	0.5
	Maximum allowable concentration (MAC-EQS) (µg/l)	1
Salinity	Practical Salinity Units (PSU)	40 PSU A discharge affecting shellfish waters must not cause their salinity to exceed by more than 10% the salinity of waters not so affected.

Table 2

Shellfish Water Salinity Guideline Standard

Parameter	Units	Standard
Salinity	PSU	12-38