S.I. No. 272/2009 — European Communities Environmental Objectives (Surface Waters) Regulations 2009

 

 

 

SCHEDULE 3

 

The Presentation of Monitoring Results and Surface

Water Classification

 

 

 

Schedule 4

 

The Classification of Ecological Status for Rivers, Lakes, Transitional Waters and Coastal Waters

 

 

 

Schedule 5

 

Criteria for Calculating Surface Water Ecological Status and Ecological Potential

 

 

 

SCHEDULE 6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SCHEDULE 3

 

THE PRESENTATION OF MONITORING RESULTS AND SURFACE

WATER CLASSIFICATION

 

 

Table 1

 

Ecological Status

 

 

Ecological Status Classification

 

 

Colour Code

High

Blue

Good

Green

Moderate

Yellow

Poor

Orange

Bad

Red

 

 

 

Table 2

 

Ecological Potential

 

Ecological Potential Classification

 

Colour Code

 

Artificial Water Bodies

Heavily Modified

Good and Above

 

Equal green and light grey stripes

Equal green and dark grey stripes

Moderate

 

Equal yellow and light grey stripes

Equal yellow and dark grey stripes

Poor

 

Equal Orange and light grey stripes

Equal orange and dark grey stripes

Bad

 

Equal red and light grey stripes

Equal red and dark grey stripes

 

 

 

Table 3

 

Chemical Status

 

 

Chemical Status Classification

 

 

Colour Code

Good

Blue

Failing to achieve good

Red

 


Schedule 4

 

The Classification of Ecological Staus for Rivers, Lakes, Transitional Waters and Coastal Waters

 

 

Table 4

 

The General Definition of High, Good and Moderate Ecological Status (1) (2)

 

High Status

There are no, or only very minor, anthropogenic alterations to the values of the physico-chemical and hydromorphological quality elements for the surface water body type from those normally associated with that type under undisturbed conditions.

 

The values of the biological quality elements for the surface water body reflect those normally associated with that type under undisturbed conditions, and show no, or only very minor, evidence of distortion.

Good Status

The values of the biological quality elements for the surface water body type show low levels of distortion resulting from human activity, but deviate only slightly from those normally associated with the surface water body type under undisturbed conditions.

Moderate Status

The values of the biological quality elements for the surface water body type deviate moderately from those normally associated with the surface water body type under undisturbed conditions. The values show moderate signs of distortion resulting fro human activity and are significantly more disturbed than under conditions of good status.

 

 

 

 

(1)            Surface waters achieving a status below moderate shall be classified as poor or bad.

(2)            The text in Table 4 provides a general definition only of ecological quality. For the purpose of classifying surface water ecological status, regard must be had, as appropriate, to the biological, hydromorphological and supporting physico-chemical quality elements listed in tables 5,6, and 7 of this Schedule and to the boundary conditions established in Tables 8, 9, and 10 of Schedule 5.


Table 5

 

The Biological Quality Elements that may be used when calculating Ecological Status

 

 

Surface Water Category

 

 

 

Biological Quality Element

River Water Quality

 

Composition and abundance of aquatic flora

Composition and abundance of benthic invertebrate fauna

Composition, abundance and age structure of fish fauna

Lake Water Quality

 

Composition, abundance and biomass of phytoplankton

Composition and abundance of other aquatic flora

Composition and abundance of benthic invertebrate fauna

Composition, abundance and age structure of fish fauna

Transitional Water Body

 

Composition, abundance and biomass of phytoplankton

Composition and abundance of other aquatic flora

Composition and abundance of benthic invertebrate fauna

Composition and abundance of fish fauna

Coastal Water Quality

 

Composition, abundance and biomass of phytoplankton

Composition and abundance of other aquatic flora

Composition and abundance of benthic invertebrate fauna

 

 

 

 

 

 

 


Table 6

 

The Hydromorphological Quality Elements Supporting the Biological Quality Elements

 

 

Surface Water Category

 

Hydromorphological Quality Element

Description

River Water Body

Hydrological Regime

 

Quantity and dynamics of water flow. Connection to groundwater bodies

River Continuity

 

 

Morphological Conditions

River depth and width variation.

Structure and substrate of the river bed

Structure of riparian zone

Lake Water Body

Hydrological Regime

 

Quantity and dynamics of water flow

Residence time

Connection to groundwater bodies

Morphological Conditions

Lake water variation

Quantity, structure and substrate of the lake bed

Structure of the lake shore

Transitional Water Body

Morphological Conditions

Depth variation

Quantity, structure and substrate of the bed

Structure of the intertidal zone

Tidal Regime

Freshwater flow

Water Exposure

 

Morphological Conditions

Depth variation

Structure and substrate of the coastal bed

Structure of the intertidal zone

Tidal Regime

 

Direction of dominant currents

Wave exposure

 


 Table 7

 

The Physico-chemical Quality Elements Supporting the Biological Elements to be taken into account when calculating Ecological Status

 

 

Surface Water Category

 

Physico-chemical Quality Element

 

River Water Body

General Conditions

 

*       Thermal conditions

*       Oxygenation conditions

*       Salinity

*       Acidification status and

*       Nutrient conditions

Specific Pollutants

 

Pollution by synthetic or non-synthetic substances listed in Table 10 of Schedule 5 of these Regulations, not for the time being identified as priority substances, which are discharged in significant quantities into the body of water

Lake Water Body

General Conditions

 

*       Transparency

*       Thermal conditions

*       Oxygenation conditions

*       Salinity

*       Acidification status

*       Nutrient conditions

Specific Pollutants

Pollution by synthetic or non-synthetic substances listed in Table 10 of Schedule 5 of these Regulations, not for the time being identified as priority substances, which are discharged in significant quantities into the body of water

Transitional Water Body

General Conditions

*       Transparency

*       Thermal conditions

*       Oxygenation conditions

*       Salinity and Nutrient conditions

Specific Conditions

Pollution by synthetic or non-synthetic substances listed in Table 10 of Schedule 5 of these Regulations, not for the time being identified as priority substances, which are discharged in significant quantities into the body of water

Coastal Water Body

General Conditions

*       Transparency

*       Thermal conditions

*       Oxygenation conditions

*       Salinity and Nutrient conditions

Specific Conditions

 

Pollution by synthetic or non-synthetic substances listed in Table 10 of Schedule 5 of these Regulations, not for the time being identified as priority substances, which are discharged in significant quantities into the body of water

 


Schedule 5

 

Criteria for Calculating Surface Water Ecological Status and Ecological Potential

 

 

 

Table 8

 

Biological Quality Parameters

 

RIVERS (All Types)

 

 

Biological Quality Element

Classification System

Ecological Quality Ratio

High – Good Boundary

Good – Moderate Boundary

Benthic Invertebrate Fauna

Quality Rating System (Q- value)

0.85

0.75

Phytobenthos

Trophic Diatom Index (TDI)

0.93

0.78

 

 

 

LAKES

 

Biological Quality Element

Classification System

Lake Type(1)

Ecological Quality Ratio

Chlorophyll a (µg/l)

High – Good Boundary

Good – Moderate Boundary

High – Good

Good – Moderate

Phytoplankton(2)

Phytoplankton biomass(3)

(Chlorophyll a)

Lake Type 4

 

0.50

0.33

6

9

Lake Types 7,8,11 and 12

 

0.55

0.32

5.8

10

Macrophytes

Lake Macrophytes

All Types

0.90

0.68

 

 

 

 

(1)            Type 4:               Low alkalinity (<20 mg/l CaCO3), deep (>4m) and large (>50ha)

            Type 7:               Moderate alkalinity (20 - 100 mg/l CaCO3), deep (>4m) and small (<50ha)

            Type 8:   Moderate alkalinity (20 - 100 mg/l CaCO3), deep (>4m) and large (>50ha)

            Type 11: High alkalinity (>100 mg/l CaCO3), deep (>4m) and small (<50ha)

          Type12: High alkalinity (>100 mg/l CaCO3), deep (>4m) and large (>50ha)

(2)         The phytoplankton boundary conditions for lake types 7,8,11 and 12 shall apply on an interim basis for classifying lake types not currently listed. EQR boundary conditions are yet to be developed for shallow calcareous lakes.

(3)            Growing season (March to October) mean value. A minimum of 4 samples distributed throughout the growing season is required in any one year. Phytoplankton biomass is not an appropriate indicator for assessing lake trophic status when zebra mussels are present.


Coastal Waters (all types with the exception of coastal water lagoons)

 

 

 

Biological Quality Element

Classification System

Ecological Quality Ratio

High – Good Boundary

Good – Moderate Boundary

Phytoplankton

 

 

Phytoplankton Biomass

(Chlorophyll)

High – Good

Good – Moderate

Chlorophyll (µg/l)(1)

0.66

0.33

2.5 (median value) and 5.0 (90 percentile value)(2)

 

5.0 (median value) and 10.0 (90 percentile value)(3)

5.0 median value) and 10.0 (90 percentile value)(2)

 

10.0 (median value) and 20.0 (90 percentile value)(3)

Phytoplankton Composition

0.84

0.43

Percentage of single taxa counts above thresholds

20

39

 

 

 

 

 

 

Coastal and Transitional Waters (all types with the exception of transitional and coastal water lagoons)

 

 

 

Biological Quality Element

Classification System

Ecological Quality Ratio

High – Good Boundary

Good – Moderate Boundary

 

Macroalgae

Rocky shore reduced species list multimetric system

0.80

0.60

Opportunistic macroalgae multimetric system

0.80

0.60

 

 

 

(1)       Growing season March to September

(2)       Cold acetone extraction method

(3)            Hot methanol extraction method


 

Table 9

 

Physico-chemical conditions supporting the biological elements

 

PART A: General Conditions

 

THERMAL CONDITIONS

 

Thermal Conditions

 

River Water

Body

Lake Water

Body

Transitional Water Body

Coastal Water Body

 

Temperature

 

Not greater than 1.5°C rise in ambient temperature outside the mixing zone

 

 

 

OXYGENATION CONDITIONS (BIOCHEMICAL OXYGEN DEMAND)

 

Oxygenation Conditions

River Water Body

Lake Water Body

Transitional Water Body

Coastal Water Body

 

Biochemical Oxygen Demand (BOD)

(mg O2/l)

 

 

High status ≤1.3 (mean(1)) or ≤2.2 (95%ile)

 

Good status ≤1.5 (mean(1)) or ≤2.6 (95%ile)

 

 

 

≤4.0 mg/l (95%ile)

 

 

 

 

(1)       The calculation of the arithmetic mean and the analytical method used must be in accordance with the technical specifications for chemical monitoring and quality of analytical results to be adopted in accordance with Directive 2000/60/EC of the European Parliament and of the Council, including how to apply an EQS where there is no appropriate analytical method meeting the minimum performance criteria.

 


OXYGENATION CONDITIONS CONTINUED (DISSOLVED OXYGEN)

 

 

 

Oxygenation Conditions

 

River Water Body

 

Lake Water Body

 

Transitional Water Body

(Summer)

 

Coastal Water Body

(Summer)

 

Dissolved Oxygen Lower Limit

 

95%ile >80% Saturation

 

(0 psu(1))

95%ile >70% Saturation

 

(35 psu)

95%ile >80%

Saturation

 

 

(35 psu)

95%ile >80%

Saturation

 

 

Dissolved Oxygen Upper Limit

 

95%ile <120% Saturation

 

(0 psu(1))

95%ile <130% Saturation

 

(35 psu)

95%ile <120%

Saturation

 

 

(35 psu)

95%ile <120%

Saturation

 

 

 

 

 

ACIDIFICATION STATUS

 

 

 

Acidication Status

 

 

River Water Body

 

Lake Water Body

 

Transitional Water Body

 

 

Coastal Water Body

 

 

pH

(Individual Values)

 

Soft(2) Water 4.5<pH<9.0

Hard(3) Water 6.0<pH<9.0

 

 

 

 

 

 

(1)       psu:  The Practical Salinity Unit defines salinity in terms of a conductivity ratio of a sample to that of a solution of 32.4356g of KCl at 15°C in I kg of solution. A sample of seawater at 15°C with a conductivity equal to this KCl solution has a salinity of exactly 35 practical salinity units.

(2)            Water Hardness ≤100 mg/l CaCO3

(3)       Water Hardness >100 mg/l CaCO3


NUTRIENT CONDITIONS

 

 

 

Nutrient Conditions

 

 

River Water Body

 

Lake(1)

 

Transition Water Body

Coastal Water Body

 

Total Ammonia (mg N/l)

 

 

High Status ≤0.040 (mean) or ≤0.090 (95%ile)

Good Status ≤0.065 (mean) or ≤0.140 (95%ile)

 

 

 

 

Dissolved Inorganic Nitrogen

(mg N/l)

 

 

 

 

Good Status

(0 psu(2))

≤2.5mgN/l

 

34.5 psu(2))

≤0.25mgN/l

 

 

High Status

(34.5 psu(2))

≤0.17mgN/l

 

 

Molybdate Reactive Phosphorus

(MRP)

(mg P/l)

 

 

High Status

≤0.025 (mean) or ≤0.045 (95%ile)

 

Good Status

 ≤0.035 (mean) or ≤0.075 (95%ile)

 

 

 

(0-17 psu(2))

≤0.060 (median)

 

(35 psu(2))

≤0.040 (median)

 

 

 

 

 

 

 

(1)            Total Phosphorus (TP) is an important measure of lake trophic status and TP measurements are includes as part of the lakes monitoring programme; TP boundary conditions are yet to be established for lakes.

(2)       Linear interpolation to be used to establish the limit value for water bodies between these salinity levels based on the median salinity of the water body being assessed.


Table 10

 

PHYSICO-CHEMICAL CONDITIONSSUPPORTING THE BIOLOGICAL ELEMENTS

 

PART B:          SPECIFIC POLLUTANTS

 

AA:     Annual Average

MAC:   Maximum Allowable Concentration

Unit:  [µg/l]

 

 

Name of substance

 

Environmental Quality Standard (EQS) (2) (3) (6)

 

AA-EQS(7)

Inland Surface Waters

 

AA-EQS

Other Surface Waters

 

 

MAC-EQS(8)

Inland Surface Waters

 

MAC-EQS

Other Surface Waters

 

Arsenic

25

20

-

-

Chromium III

4.7

-

32

-

Chromium VI

3.4

0.6

-

32

Copper(4)

5 or 30

5

-

-

Cyanide

10

10

-

-

Diazinon

0.01

0.01

0.02

0.26

Dimethoate

0.8

0.8

4

4

Fluoride

500

1,500

-

-

Glyphosphate

60

-

-

-

Linuron

0.7

0.7

0.7

0.7

Mancozeb

2

2

7.3

7.3

Monochlorobenzene

1.5

25

-

-

Phenol

8

8

46

46

Toluene

10

10

-

-

Xylenes

10

10

-

-

Zinc(5)

8 or 50 or 100

40

-

-

 

(1)            The calculation of the arithmetic mean and the analytical method used must be in accordance with technical specifications to be adopted for chemical monitoring and quality of analytical results in accordance with Directive 2000/60/EC of the European Parliament. And of the Council, including how to apply an EQS where there is no appropriate analytical method meeting of the minimum performance criteria.

(2)         The values for all metals are for dissolved metals i.e. after filtration through a 0.45 micron filter. In designing monitoring programmes, it was recommended that total chromium be determined. Where the result for total chromium is less than the EQS for Cr VI, no further investigation is deemed necessary. Where the total chromium level is above the EQS, an assessment should be made of the potential discharges of Cr VI into the water-body. Where there is a risk of Cr VI contamination, speciation studies should be included in the monitoring programme.

(3)         The values for all metals, except chromium VI are as added values to background concentrations.

(4)         In the case of copper the value 5 applies where the water hardness in mg/l CaCO3 is less than or equal to 100; the value 3o applies where the water hardness exceeds 100mg/l CaCO3

(5)         In the case of zinc, the standard shall be 8µg/l for water hardness with annual average values less than or equal to 10mg/l CaCO3, 50µg/l for water hardness greater than 10mg/l CaCO3 and 100µg/l elsewhere.

(6)         Standards for compounds other than metals refer to total concentrations in the whole water sample.

(7)         AA-EQS means that for each representative monitoring point within the water-body, the arithmetic mean of the concentrations measured over a 12 month monitoring period does not exceed the standard.

(8)         MAC-EQS means that for each representative monitoring period within the water-body no measured concentration exceeds the standard


SCHEDULE 6

 

Table  11

 

The environmental quality standards for priority substances and certain other pollutants to apply for the purpose of assigning chemical status

 

With the exception of cadmium, lead, mercury and nickel (hereinafter “metals”) the EQS values in Tables 11 and 12 are expressed as total concentrations in the whole water sample. In the case of metals the EQS refers to the dissolved concentration, i.e. the dissolved fraction of a water sample obtained by filtration through a 0.45µm filter or any equivalent pre-treatment.

 

 

Priority Substances

 

AA:     Annual Average(1)

MAC:   Maximum Allowable Concentration

Unit:   [µg/l]

 

 

No.

 

Name of Substance

 

Chemical Abstract Service No.

 

AA-EQS(2)

Inland Surface Waters(3)

 

AA-EQS(2)

Other Surface Waters

 

 

MAC-EQS(4)

Inland Surface Waters(3)

 

MAC-EQS(4)

Other Surface Waters

 

 

1

Alachlor

15972-60-8

0.3

0.3

0.7

0.7

 

2

Atrazine

1912-24-9

0.6

0.6

2.0

2.0

 

3

Benzene

71-43-2

10

8

50

50

 

4

Carbon Tetrachloride(5)

56-23-5

12

12

Not Applicable

Not Applicable

 

5

Chlorofenvinphos

470-90-6

0.1

0.1

0.3

0.3

 

6

Chlorpyrifos

(Chlorpyrifos-ethyl)

2921-88-2

0.03

0.03

0.1

0.1

 

7a

Cyclodiene pesticides:Aldrine(5),

Dieldrin(5) ,Endrin(5)

Isodrin(5)

309-00-260-57-172-20-8465-73-6

∑=0.01

∑=0.005

Not Applicable

Not Applicable

 

7b

DDT total(5) (6)

Not Applicable

0.025

0.025

Not Applicable

Not Applicable

 

Para-para DDT(5)

50-29-3

0.01

0.01

Not Applicable

Not Applicable

 

8

1,2 Dichloroethane

107-06-2

10

10

Not Applicable

Not Applicable

 

9

Dichloromethane

75-09-2

20

20

Not Applicable

Not Applicable

 

10

Di(2-ethylhexyl)-phthalate (DEHP)

117-81-7

1.3

1.3

Not Applicable

Not Applicable

 

11

Diuron

330-54-1

0.2

0.2

1.8

1.8

 

12

Fluoranthene

206-44-0

0.1

0.1

1

1

 

13

Isoproturon

34123-59-6

0.3

0.3

1.0

10

 

14

Lead and its compounds

7439-92-1

7.2

7.2

Not Applicable

Not Applicable

 

15

Naphthalene

91-20-3

2.4

1.2

Not Applicable

Not Applicable

16

Nickel and its compounds

7440-02-0

20

20

Not Applicable

Not Applicable

17

Octyphenol

((4-(1,1,3,3tetra methylbutyl)-phenol))

140-66-9

0.1

0.01

Not Applicable

Not Applicable

18

Pentachloro-phenol

87-86-5

0.4

0.4

1

1

19

Simazine

122-34-9

1

1

4

4

20a

Tetrachloro-ethylene(5)

127-18-4

10

10

Not Applicable

Not Applicable

20b

Trichloro-

Ethylene(5)

79-01-6

10

10

Not Applicable

Not Applicable

21

Trichloro-

benzene

12002-48-1

0.4

0.4

Not Applicable

Not Applicable

22

Trichloro-

methane

67-66-3

2.5

2.5

Not Applicable

Not Applicable

 

(1)      The calculation of the arithmetic mean and the analytical method used must be in accordance with the technical specifications to be adopted for chemical monitoring and quality of analytical results in accordance with Directive 200/60/EC of the European Parliament and of the Council including how to apply an EQS where there is no appropriate analytical method meeting the minimum performance criteria.

(2)      This parameter is the Environmental Quality Standard expressed as an annual average value (EQS-AA). Unless otherwise specified, it applies to the total concentration of isomers.

(3)      Inland surface waters encompass rivers and lakes and related artificial or heavily modified water bodies.

(4)      This parameter is the European Quality Standard expressed as a maximum allowable concentration (MAC-EQS). Where the MAC-EQS are marked as “not applicable”, the AA-EQS values are considered protective against short-term pollution peaks in continuous discharges since they are significantly lower than the values derived on the basis of acute toxicity.

(5)      This substance is not a priority substance but one of the pollutants for which the EQS are identical to those laid down in community legislation that applied prior to Directive 2008/105/EC of the European Parliament and Council on environmental quality standards in the field of water policy.

(6)      DDT total comprises the sum of isomers 1,1,1 trichloro-2,2 bis (p-chlorophenyl) ethane ( CAS number 50-29-3; EU number 200-024-3); 1,1,1trichloro-2 (o chlorophenyl)-2-(p-chlorophenyl) ethane (CAS number 789-02-6; EU number 212-332-5); 1,1-dichloro-2,2 bis (p-chlorophenyl) ethylene (CAS number 72-55-9); EU number 200-784-6);and 1,1-dichloro-2,2 bis (p-chlorophenyl) ethane (CAS number 72-54-8; EU number 200-783-0).

 


Table 12

 

The environmental quality standards for priority hazardous substances to apply for the purpose of assigning chemical status

 

Priority Hazardous Substances

 

AA:     Annual Average

MAC:   Maximum Allowable Concentration

Unit:   [µg/l]

 

 

No.

 

 

 

Name of Substance

 

Chemical Abstract Service No.

 

AA-EQS(2)

Inland Surface Waters

 

AA-EQS(2)

Other Surface Waters

 

 

MAC-EQS(4)

Inland Surface Waters

 

MAC-EQS(4)

Other Surface Waters

 

(1)

Anthracene

120-12-7

0.1

0.1

0.4

 

(2)

Brominated  diphenylether(5)

32534-81-9

0.0005

0.0002

Not Applicable

Not Applicable

(3)

Cadmium and its compounds (depending on water hardness classes)(6)

7440-43-9

≤0.08 (Class 1)

0.08

(Class 2)

0.09

(Class 3)

0.15

(Class 4)

0.25

(Class 5)

0.2

≤0.45

(Class 1)

0.45

(Class 2)

0.6

(Class 3)

0.9

(Class 4)

1.5

(Class 5)

≤0.45

(Class 1)

0.45

(Class 2)

0.6

(Class 3)

0.9

(Class 4)

1.5

(Class 5)

(4)

C10 – C13 Chloroalkanes

85535-84-8

0.4

0.4

1.4

1.4

(5)

Endosulfan

115-29-7

0.005

0.0005

0.01

0.004

(6)

Hexachlorobenzene

118-74-1

0.01

0.01

0.05

0.05

(7)

Hexachlorobutadiene

87-68-3

0.1

0.1

0.6

0.6

(8)

Hexachlorocyclohexane

608-73-1

0.02

0.002

0.04

0.02

(9)

Mercury and its compounds

7439-97-6

0.05

0.05

0.07

0.07

(10)

Nonylphenol

(4-Nonylphenol)

104-40-5

0.3

0.3

2.0

2.0

(11)

Pentachlorobenzene

608-93-5

0.007

0.0007

Not Applicable

Not Applicable

(12)

Polyaromatic Hydrocarbons (PAH)(7)

Not Applicable

Not Applicable

Not Applicable

Not Applicable

Not Applicable

Benzo(a)pyrene

50-32-8

0.05

0.05

0.1

0.1

Benzo(b)fluoranthene

205-99-2

∑=0.03

∑=0.03

Not Applicable

Not Applicable

Benzo(k)fluoranthene

207-08-9

Benzo(g,h,i)perylene

191-24-2

∑=0.002

∑=0.002

Not Applicable

Not Applicable

Indeno

(1,2,3-cd)pyrene

193-39-5

13

Tributyltin Compounds (Tributyltin-cation)

36643-28-4

 

0.0002

0.0002

0.0015

0.0015

 


(1)       The calculation of the arithmetic mean and the analytical method used must be in accordance with the technical specifications to be adopted for chemical monitoring and quality of analytical results in accordance with Directive 200/60/EC of the European Parliament and of the Council including how to apply an EQS where there is no appropriate analytical method meeting the minimum performance criteria.

(2)       This parameter is the Environmental Quality Standard expressed as an annual average value (EQS-AA). Unless otherwise specified, it applies to the total concentration of isomers.

(3)       Inland surface waters encompass rivers and lakes and related artificial or heavily modified water bodies.

(4)       This parameter is the European Quality Standard expressed as a maximum allowable concentration (MAC-EQS). Where the MAC-EQS are marked as “not applicable”, the AA-EQS values are considered protective against short-term pollution peaks in continuous discharges since they are significantly lower than the values derived on the basis of acute toxicity.

(5)       For the group of priority substances covered by brominated dephenylethers listed in Decision 2455/2001/EC, an EQS is established only for congener numbers 28, 47, 99, 100, 153 and 154.

(6)       For cadmium and its compounds the  EQS values vary dependent upon hardness of the water as specified in five class categories (Class1: <40mg CaCO3/l, Class 2: <40 to <50mg CaCO3/l, Class 3: 50 to <100mg CaCO3/l, Class 4: 100 to <200mg CaCO3/l and Class 5: ≥200mg CaCO3/l).

(7)       For the group of substances polyaromatic hydrocarbons (PAH), each individual EQS is applicable, i.e. the EQS for Benzo(a)pyrene, the EQS for the sum of Benzo(b)fluoranthene and Benzo(k)fluoranthene and the EQS for the sum of Benzo(g,h,i)perylene and Indeno(1,2,3-cd)pyrene must be met.