Introduction

This report summarises the results of operational monitoring at the Ballyboden, Ballymore

Eustace, and Roundwood waterworks carried out during May 2015.

The percentage compliance figures of the final water for each of the waterworks in this report

are based on the parametric values listed in the European Union (Drinking Water)

Regulations 2014 (S.I. 122 of 2014). However, in the case of fluoride notice is also drawn,

whenever applicable, to any result below 0.6mg/l which is the minimum concentration

specified for fluoridated water supplies in the Fluoridation of Water Supplies Regulations

2007 (S.I. No. 42 of 2007).

Results Summary

1. Vartry Works Roundwood.

Compliance of the Final water with the European Union (Drinking Water) Regulations 2014 (S.I. 122 of 2014) is set out below. Results are summarised in Appendix 1.

(i) Final Water – Plant Output:

Parameter

Parametric Values(s)

No. of Samples

No. Inside Limit

% Compliance

Colour (°Hazen) Acceptable to consumers & no abnormal change

20 20 100

Turbidity (N.T.U.)

1.0 31 31 100

Conductivity (μS/cm @ 200C)

2500 20 20 100

pH

6.5 - 9.5 20 20 100

Fluoride (mg/l)

0.8 20 20 100

Total Coliform (MPN/100ml)

<1 31 31 100

E. Coli (MPN/100ml)

<1 31 31 100

(ii) Final Water – Callow Hill:

Parameter

Parametric Values(s)

No. of Samples

No. Inside Limit

% Compliance

Colour (°Hazen) Acceptable to consumers & no abnormal change

31 31 100

Turbidity (N.T.U.)

1.0 31 31 100

Conductivity (μS/cm @ 200C)

2500 31 31 100

pH

6.5 - 9.5 31 31 100

Fluoride (mg/l)

0.8 31 31 100

Total Coliform (MPN/100ml)

<1 31 31 100

E. Coli (MPN/100ml)

<1 31 31 100

2. Dodder Works Ballyboden

Compliance of the final water with the European Union (Drinking Water) Regulations 2014 (S.I. 122 of 2014) is set out below. Results are summarised in Appendix 2. (i) Final Water – Plant Output:

Parameter

Parametric

Value(s)

No. of Samples

No. Inside Limit

% Compliance

Colour (°Hazen) Acceptable to consumers & no abnormal change

20 20 100

Turbidity (N.T.U.)

1.0 20 20 100

Conductivity (μS/cm @ 200C)

2500 20 20 100

pH

6.5 - 9.5 20 20 100

Aluminium (mg/l)

0.2 20 20 100

Fluoride (mg/l)

0.8 20 20 100

Total Coliforms (MPN/100ml)

<1 20 20 100

E. Coli (MPN/100ml)

<1 20 20 100

(ii) Final Water – Pond Outlet:

Parameter

Parametric Values(s)

No. of Samples

No. Inside Limit

% Compliance

Colour (°Hazen) Acceptable to consumers & no abnormal change

20 20 100

Turbidity (N.T.U.)

1.0 20 20 100

Conductivity (μS/cm @ 200C)

2500 20 20 100

pH

6.5 - 9.5 20 20 100

Aluminium (mg/l)

0.2 20 20 100

Fluoride (mg/l)

0.8 20 20 100

Total Coliforms (MPN/100ml)

<1 19 19 100

E. Coli (MPN/100ml)

<1 19 19 100

3. Liffey Works Ballymore Eustace. Compliance of the final water with the European Union (Drinking Water) Regulations 2014 (S.I. 122 of 2014) is set out below. Results are summarised in Appendix 3.

(i) In Process Water [Contact Tank No.1]:

Parameter

Parametric Values(s)

No. of

Samples

No. Inside Limit

% Compliance

Colour (°Hazen) Acceptable to consumers & no

abnormal change

20 20 100

Turbidity (N.T.U.)

1.0 20 20 100

Conductivity (μS/cm @ 200C)

2500 20 20 100

pH

6.5 - 9.5 20 20 100

Aluminium (mg/l)

0.2 20 20 100

Fluoride (mg/l)

0.8 20 20 100

Total Coliforms (MPN/100ml)

0 20 20 100

E. Coli (MPN/100ml)

0 20 20 100

The frequency of sampling at this location has been reduced. Access has been restricted at weekends until further notice due to health and safety concerns.

(ii) In Process Water [Contact Tank No.2]:

Parameter

Parametric Values(s)

No. of

Samples

No. Inside Limit

% Compliance

Colour (°Hazen) Acceptable to consumers & no

abnormal change

31

31

100

Turbidity (N.T.U.)

1.0 31 31 100

Conductivity (μS/cm @ 200C)

2500 31 31 100

pH

6.5 - 9.5 31 31 100

Aluminium (mg/l) 0.2 31 31 100

Fluoride (mg/l)

0.8

31 31 100

Total Coliforms (MPN/100ml)

<1 31 31 100

E. Coli (MPN/100ml)

<1 31 31 100

(ii) Final Water [Reservoir]:

Parameter

Parametric Values(s)

No. of Samples

No. Inside Limit

% Compliance

Colour (°Hazen) Acceptable to consumers & no abnormal change

31 31 100

Turbidity (N.T.U.)

1.0 31 31 100

Conductivity (μS/cm @ 200C)

2500 31 31 100

pH

6.5 - 9.5 31 31 100

Aluminium (mg/l)

0.2 31 31 100

Fluoride (mg/l)

0.8

31 31 100

Total Coliforms /100ml

0 31 31 100

E. Coli (MPN/100ml)

0 31 31 100

4. Aluminium Residuals - Treated Waters. A more detailed breakdown of aluminium residuals in final water (ex. waterworks) is presented in Appendix 4.

5. Cryptosporidium/Giardia Analysis. Results for cryptosporidium/giardia analysis of the raw (pre-treatment) and final water (ex. waterworks and open storage reservoirs) is presented in Appendix 5. This appendix also contain results of investigative samples as the need arises.

6. Biological Testing. A summary of Diatom counts for the Roundwood raw (pre-treatment) water is presented in Appendix 6.

Appendix 1: Vartry Works Roundwood

Results Summary

May 2015

Raw

Combined

Filtered

Individual

Filters

(Filters 1,2,4 – 10,

11, 13-16)

Plant Final

Callow Hill

Number of Samples

31 20 20 20 31

Alkalinity (mg/l CaCO3)

11-20 - - 17-30 19-30

Colour (°Hazen)

20-27.5 14-20 15-20 10-15 7.5-12.5

Conductivity (μS/cm @ 200C)

86-116 - - 110-131 112-129

E. Coli (MPN/100ml)

<1-291 <1-9

<1-9

<1 (31 samples)

<1 (31 samples)

Fluoride (mg/l)

- - 0.67-0.72 0.62-0.72

Free Residual Chlorine (mg/l)

- - 0.51-0.93 0.41-0.58

pH

7.03-7.50 6.80-7.10 6.72-7.10 8.64-9.20 7.69-8.55

Total Coliforms/100ml

29-3076 20-770 - <1 (31 samples)

<1 (31 samples)

Total Residual Chlorine (mg/l)

- - - 0.60-1.05 0.54-0.72

Turbidity (N.T.U.)

0.93-1.41 0.16-0.40 0.11-0.61 0.25-0.39 0.19-0.35

Appendix 2: Dodder Works Ballyboden Results Summary

May 2015

Raw

Combined

Settled Water

Filtered

Final:

Plant Output

Final:

Pond Outlet

Number of Samples

20 20 20 20 20

Alkalinity (mg/l aCO3) 31-48 - - 38-51

29-34

Aluminium (mg/l)

- 0.13-0.21 - <0.05

(all samples) <0.05

(all samples)

Colour (°Hazen)

33-42 2-3 - <1-4 <1-2

Conductivity (μS/cm @ 200C)

106-133 - - 155-174 145-155

E. Coli (MPN/100ml)

2-51 - <1

(all samples) <1

(all samples) <1

(all samples)

Fluoride (mg/l)

- - - 0.64-0.70 0.63-0.70

Free Residual Chlorine (mg/l)

- - - 0.60-0.73 0.64-0.78

pH

7.53-7.67 6.61-6.77 - 7.33-7.66 7.25-7.40

Total Residual Chlorine (mg/l)

- - - 0.66-0.82 0.71-0.89

Total Coliforms (MPN/100ml)

76-727 - <1

(all samples) <1

(all samples) <1

(all samples)

Turbidity (N.T.U.)

1.31-2.14 0.33-0.55 - 0.08-0.18 0.10-0.14

Appendix 3: Liffey Works Ballymore Eustace

Results Summary

May 2015

Raw Settled: Upward

Flow Clarifiers

(A)*

6

Settled: Inclined

Plate Clarifiers

(B)*

6

Settled: Inclined

Plate Clarifiers

(C)*

6

Filtered Contact Tank No.1

Contact Tank No.2

Final: Reservoir

Number of Samples

31 20 31 20 31 20 31 31

Alkalinity (mg/l CaCO3)

31-37 - - - - 28-35 29-34 29-32

Aluminium (mg/l)

- <0.05-0.18 0.14-0.26 0.14-0.23 <0.05

(all samples)

<0.05 (all

samples)

<0.05 (all

samples)

<0.05 (all

samples)

Colour (°Hazen) 70-80

<2.5 (all

samples) <2.5-2.5

<2.5 (all

samples) <2.5-2.5

<2.5 (all

samples)

<2.5 (all

samples)

<2.5 (all

samples)

Conductivity (μS/cm @ 200C )

107-131 - - - - 148-164 151-168 155-166

E. Coli MPN/100ml <1-2 - - - -

<1 (all

samples)

<1 (all

samples)

<1 (all

samples)

Fluoride (mg/l)

- - - - - 0.56-0.71 0.65-0.78 0.63-0.75

Free Residual Chlorine (mg/l)

- - - - - 0.42-0.68 0.44-0.79 0.29-0.46

pH

7.63-7.78 6.40-6.53 6.43-6.56 6.46-6.57 6.46-6.69 7.29-8.33 7.59-8.86 7.54-8.12

Total Coliforms /100ml

<1-27 - - - - <1 (all

samples)

<1 (all

samples)

<1 (all

samples)

Total Residual Chlorine (mg/l)

- - - - - 0.46-0.77 0.47-0.85 0.38-0.49

Turbidity (N.T.U.)

1.22-1.66 0.43-0.97 0.53-1.18 0.44-0.89 0.08-0.14 0.12-0.26 0.13-0.62 0.12-0.23

Appendix 4: Treated Water (Ex Waterworks)

Aluminium Residuals May 2015

(1) Dodder Works Ballyboden. Final Water – Plant Output

Al CONCENTRATION

NO. OF SAMPLES

% OF TOTAL

0 - 0.05 mg/l

20 100

Final Water – Pond Outlet

Al CONCENTRATION

NO. OF SAMPLES

% OF TOTAL

0 - 0.05 mg/l

20 100

(2) Liffey Works Ballymore Eustace.

Contact Tank No. 1

Al CONCENTRATION

NO. OF SAMPLES

% OF TOTAL

0 - 0.05 mg/l

20 100

Contact Tank No. 2

Al CONCENTRATION

NO. OF SAMPLES

% OF TOTAL

0 - 0.05 mg/l

31 100

Reservoir

Al CONCENTRATION

NO. OF SAMPLES

% OF TOTAL

0 - 0.05 mg/l

31 100

EC PARAMETRIC VALUE: 0.20 mg/l Al (also expressed as 200ug/l Al).

Appendix 5: Cryptosporidium/Giardia Analysis

May 2015

(1) Vartry Works Roundwood.

(2) Dodder Works Ballyboden.

(3) Liffey Works Ballymore Eustace.

RAW FINAL: PLANT OUPUT FINAL: CALLOW HILL

Date: Cryptosp-oridium

(Oocysts/l)

Giardia ( Cysts/l )

Date: Cryptosp-oridium

(Oocysts/l)

Giardia ( Cysts/l )

Date: Cryptosp-oridium

(Oocysts/l)

Giardia (Cysts/l )

02.05.15 0.000 0.000 02.05.15 0.000 0.000 04.05.15 0.000 0.000 04.05.15 0.000 0.000 10.05.15 0.000 0.000 10.05.15 0.000 0.000

12.05.15 0.000 0.000 11.05.15 0.000 0.000 11.05.15 0.000 0.000 18.05.15 0.000 0.000 17.05.15 0.000 0.000 17.05.15 0.000 0.000 19.05.15 0.000 0.000 19.05.15 0.000 0.000 19.05.15 0.000 0.000 25.05.15 0.000 0.000 24.05.15 0.000 0.000 24.05.15 0.000 0.000 26.05.15 0.020 0.000 25.05.15 0.000 0.000 25.05.15 0.000 0.000

RAW FINAL: PLANT OUPUT FINAL: POND OUTLET

Date: Cryptosp-oridium

(Oocysts/l)

Giardia ( Cysts/l )

Date: Cryptosp-oridium

(Oocysts/l)

Giardia ( Cysts/l )

Date: Cryptosp-oridium

(Oocysts/l)

Giardia (Cysts/l )

05.05.15 0.000 0.000 04.05.15 0.000 04.05.15 0.000 0.000

12.05.15 0.000 0.000 11.05.15 0.000 11.05.15 0.000 0.000

19.05.15 0.014 0.000 19.05.15 0.000 19.05.15 0.000 0.000

26.05.15 0.000 0.000 25.05.15 0.000 25.05.15 0.000 0.000

RAW FINAL

Date: Cryptosporidium (Oocysts/l)

Giardia (Cysts/l)

Date: Cryptosporidium (Oocysts/l)

Giardia (Cysts/l)

05.05.15 0.000 0.000

11.05.15 0.000 0.000

18.05.15 0.000 0.000 18.05.15 0.000 0.000

24.05.15 0.000 0.000 25.05.15 0.000 0.000

Appendix 13: Diatom Count

May 2015

(1) Vartry Works Roundwood Raw.

Silica concentrations of Roundwood Raw are monitored as a practical environmental indicator to assist forecast decreases in diatom counts.

Sampled Date

Count/ml

Silica (mg/l as SiO2)

Asterionella

Algae Melosira

Algae Navicula

Synedra

Algae Tabellaria

Algae

Total Counted

01.05.15 83 12 136 36 0 267 2.46

05.05.15 20 12 60 8 0 100 3.14

06.05.15 17 18 12 6 0 53 2.59

08.05.15 11 4 4 8 0 27 2.16

11.05.15 6 9 5 0 1 21 2.47

12.05.15 4 3 3 1 0 11 2.51

14.05.15 12 3 0 7 0 22 -

18.05.15 2 2 0 1 0 5 2.05

20.05.15 0 0 4 0 0 4 2.02

23.05.15 8 0 4 0 0 12 1.82

25.05.15 7 0 0 0 0 7 1.83

26.05.15 6 0 2 0 0 8 1.91

27.05.15 2 0 0 0 0 2 -

29.05.15 6 1 1 1 1 10 -