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Rosscarbery Owenincha D0172-01 Ambient Monitoring Data 2016
Ambient (Coastal)
Mean
pH
BOD mg/L
SS mg/l
Ammonia (N) mg/l
DIN (N) mg/l
Faecal Coliforms MPN/100mls
E.Coli MPN/100mls
Intestinal enterococci CFU/100mls
EQS
95%ile
6 < pH < 9
N/A
N/A
N/A
≤ 0.25 @ 34 PSU
N/A
N/A
N/A
Sample Code
Sample Date
Frequency Actual
2
5
2
5
2
5
2
5
2
5
2
3
2
4
2
3
54579
55691
56452
57494
58077
09/03/2016
04/05/2016
01/06/2016
20/07/2016
17/08/2016
8
0.5
46
8
1.2
21
0
0.129
15
1986
0
8.2
0.5
24
0
0.061
8.1
1.2
19
0.02
0.048
8.1
1.2
11
0.035
0.066
23
NT
NT
NT
NT
Mean
0.04
0.272
240
1
29
Ambient Monitoring Summary
Ambient Monitoring Point from
WWDL (or as agreeded with EPA)
Downstream Monitoring Point
Impact ?
95%ile
Irish Grid
Reference EPA Feature Coding tool Code
E130548
N35092
CW05003177RY1002
Current
EQS
Status
Does Assessment of the monitoring results
indicate the discharge is impacting on
water quality
Unable to determine if discharge is
responsible for current classification .
Further investigation and nutrient input
Intermedi apportionment required
ate
7
2
5
NT
95%ILE
No
N/A
0.2434
N/A
No
N/A
N/A
N/A
Storm Water Overflow Assessment
Agglomeration Name:
Licence Register No.
Rosscarbery Owenincha
D0172_01
Table of Contents
1
2
Introduction
Storm Water Overflow Assessment
3
3
2.1
2.2
2.3
Description of SWOs
Assessment of Operating Criteria of SWOs
Assessment of Design Criteria of SWOs
3
4
4
2.3.1
Compliance with Formula A ............................................................................................ 4
2.3.2
Significance of Spill.......................................................................................................... 5
2.4
Assessment of Requirement for Storage
5
3
Remedial Measures to Ensure Compliance
7
3.1
3.2
Specified Improvement and Improvement Programme Works
Additional Measures
7
7
ii | Irish Water
1
Introduction
This report has been prepared for Do172_01, Rosscarbery-Owenincha, in Cork in accordance with
the requirements of Condition 5.2.3____ of the wastewater discharge licence for the agglomeration.
This report identifies storm water overflows within the agglomeration and assesses the compliance
of the storm water overflows with the criteria set out in the DoEHLG document on ‘Procedures and
Criteria in Relation to Storm Water Overflows’, 1995.
There are 6Nr. SWOs within the agglomeration. These are listed in Table 1.
Table 1: Storm Water Overflows in the Agglomeration
Licence Code
Discharge Location
Receiving
WFD Status Other
Water Name of Receiving designation of
Easting
Northing
and WFD Code Water
receiving
water
TPEFF05000D0172SWOO2 130186 35039
Rosscarbery
Intermediate
stream
TPEFF05000D0172SWOO3 128531 36287
Rosscarbery
Intermediate
stream
TPEFF05000D0172SWOO4 128819 36591
Rosscarbery
Intermediate
Lagoon
TPEFF05000D0172SWOO5 129103 36897
Rosscarbery
Intermediate
lagoon
TPEFF05000D0172SWOO6 129297 36182
Rosscarbery
Intermediate
bay
TPEFF05000D0172SWOO7 130782 35452
Owenincha
Intermediate
Stream
A storm water overflow assessment is required to comply with the requirements of the wastewater
discharge licence Schedule D.
2
Storm Water Overflow Assessment
2.1 Description of SWOs
Licence Discharge Location
Code
Easting
Northing
Overflow type
SWOO2
130186
35039
SWO from main
PS Owenincha
pumped to outfall
in bay if flows
exceed 3DWF
SWOO3
128531
36287
From minor PS to
network
SWOO4
128819
36591
From minor PS to
network
3 | Irish Water
Screening
frequency
and Evidence of
Visual impact
at outfall
50mm
bar
screen
discharged approx 15
times in 2106.
23961 discharged in
2016 based on pump
None
run hours
evident
None
screen
discharged estimated 2
None
times in 2106
evident
discharged once in 2106
None
evident
SWOO5
129103
36897
SWOO6
129297
36182
SWOO7
2.2
130782
From minor PS to
network
Emergency
overflow from
main PS
Rosscarbery
Emergency
overflow from
main PS
Owenincha
35452
No screen - discharged
twice in 2106
No screen - discharged
approx 4 times in 2106
None
evident
None
evident
No screen - Did not
discharge
discharged
approx in 2106
None
evident
Assessment of Operating Criteria of SWOs
The following criteria for each SWO on the network have been examined in accordance with
the assessment criteria set out in Procedures and Criteria in Relation to Storm Water
Overflows in order to determine possible capacity constraints.
1. Does the SWO cause significant visual or aesthetic impact and public complaints
2. Does the SWO cause deterioration in water quality in the receiving water (i.e. is there a
deterioration in ecological quality status attributable to the SWO)
3. Does the SWO gives rise to failure in meeting the requirements of national regulations on
foot of EU Directives (e.g. bathing water quality standards, shellfish water quality
standards, Water Framework Directive status etc.),
4. Does the SWO operate in dry weather.
Table 2: Assessment of Operating Criteria
CSO
Ref
Causes significant
visual or aesthetic
impact and public
complaints.
Causes
deterioration in
water quality in the
receiving water
Gives rise to failure in
meeting the
requirements of national
Regulations on foot of
EU Directives.
Operates
in dry
weather
Compliant
/ NonCompliant
SW02
SW03
SWO4
SWO5
SWO6
SWO7
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
Compliant
Compliant
Compliant
Compliant
Compliant
Compliant
2.3 Assessment of Design Criteria of SWOs
2.3.1 Compliance with Formula A
Formula A is used in the Procedures and Criteria in Relation to Storm Water Overflows as
follows:Formula A = DWF + 1.36P + 2E (m3/day)
P = design domestic population contributing to SWO (to be estimated)
E = design industrial effluent flow (estimated to be 20% of domestic PE unless otherwise by
LA)
4 | Irish Water
DWF = Dry weather flow m3/day (dry weather flow of total PE, based on 0.175m3/PE/day)
The maximum sewer flowrate prior to overflow to be estimated based on information
available. This will include an assessment of the PE contributing to the SWO. This may be
undertaken using the geodirectory or other appropriate means. Assessment to state where
any assumptions have been made.
2.3.2 Significance of Spill
Monitoring information in relation to frequency and duration of overflows is not available but
estimated in 2.1 above
The significance of overflows to transitional and coastal waters has been assessed as follows:
Low Significance:
Estuarial and coastal waters not containing EC identified bathing waters or shellfish waters
Medium Significance - only if all these criteria apply.
Population equivalent 2,000 - 10,000
Affects identified in bathing waters or shellfish waters
High Significance - only if all these criteria apply.
Population equivalent > 10,000
Affects identified in bathing waters or shellfish waters
Table 3: Assessment of Significance
CSO Ref
SW02
< 2,000
Designation of Receiving
Water
None
SW03
< 2,000
None
SW04
SW05
SW06
< 2,000
< 2,000
< 2,000
None
None
None
SW07
< 2,000
None
2.4
Dilution
PE Range
Significance
Determine if effecting
quality of nearby bathing
waters by additional
monitoring
Low
Low
Low
Determine if effecting
quality of nearby bathing
waters by additional
monitoring
Low
Assessment of Requirement for Storage
The necessity for a storm tank within the sewer network has been assessed based on available
dilution as detailed in Table 3 (from Procedures and Criteria in Relation to Storm Water
Overflows) included as Table 4 below. The requirement for a storm tank at a wastewater
treatment plant shall be based on an overflow setting of 3 DWF.
Table 4 – SDD Method Recommended Storage at Overflows1
Dilution Factor2
Overflow Setting
Storage Tank
>8
Formula A
None
>6
Formula A + 455 P or
None
5 | Irish Water
>4
>2
>1
Formula A
Formula A
Formula A
Formula A
40 l/PE
40 l/PE
80 l/PE
120 l/PE
1. Table 3 extracted from Procedures and Criteria in Relation to Storm Water Overflows
2. Dilution factor = average DWF / 95%ile river flow
.
Table 5 – Stormwater Storage within Agglomeration (NONE)
Dilution
Required
Actual
Required
Actual
1
Factor
Overflow
Overflow
Storage Tank Storage Tank
Setting (l/s)
Setting (l/s)
Volume (m3)
Volume (m3)
2. Dilution factor = average DWF / 95%ile river flow
6 | Irish Water
Compliant /
NonCompliant
3
Remedial Measures to Ensure Compliance
3.1
Specified Improvement and Improvement Programme Works
There are no specified improvement works or improvement programmes relating to
stormwater overflows.
3.2
Additional Measures
There are no additional measures required but storm overflows to be monitored to determine
if having effect on nearby bathing waters.
7 | Irish Water
Priority Substances Assessment
Agglomeration Name:
Licence Register No.
Rosscarbery Owenincha
D0172-01
Table of Contents
1
2
Introduction
Desktop Study
1
1
2.1
2.2
Assessment of Analysis Required
Review outcome of Desktop study
1
2
3
Assessment of Significance and Recommendations
2
Appendix 1 – Screening of Parameters for Priority Substances
Appendix 2 – Priority Substance Screening Flowchart
Appendix 3 – Receiving Waters Priority Substance Data
ii | Irish Water
1
Introduction
This report has been prepared for D0172-01, Rosscarbery_Owenincha, in County Cork in accordance
with the requirements of Condition 4.11 of the wastewater discharge licence for the agglomeration.
This desk top study has been undertaken to determine the necessity, if any, for analysis of the
discharge to comply with the condition in the wastewater discharge licence based on the Guidance
on the Screening for Priority Substances for Waste Water Discharge Licences, issued by the EPA.
Relevant inputs to the waste water works and estimates of emissions from the discharge point have
been taken into account in the preparation of this report. Relevant inputs to the waste water works,
any relevant measurements / calculations / estimates of emissions from the discharge point and any
relevant measurements undertaken at representative downstream monitoring locations have been
taken into account in the preparation of this report.
Details of the emissions concentration for the primary discharge and impact on the receiving water
are included in Appendix 1.
2
Desktop Study
2.1 Assessment of Analysis Required
A. Review of all industrial inputs into WWTP
A review of all inputs into the wastewater treatment plant (WWTP) has indicated that there are no
authorised industrial type discharges, unauthorised discharges with a likelihood of priority
substances, leachate discharges or other imports. The wastewater influent to the WWTP is domestic
in nature.
B. Discharge monitoring
The primary discharge has not been analysed for priority substances.
Analysis data does not include the full list of priority substances listed in the EPA’s Guidance on the
Screening for Priority Substances for Waste Water Discharge Licences.
C. Downstream monitoring location’s participation in relevant WFD Monitoring program
Any analysis data available for a representative downstream monitoring location from the discharge
point for the relevant parameters is included in Appendix 3 with details of the sample data and/or
source of the data.
D. Participation in PRTR reporting
The emissions of specific organic compounds and metals (priority substances) have been estimated
for the discharge utilising the EPA’s urban WWTP calculation tool for PRTR reporting.
Link to the PRTR on the epa’s website:
http://www.epa.ie/pubs/advice/aerprtr/uwwtpaerprtrguidance/newuwwprtrelectronictoolsetv50.h
tml
The emission concentration estimated by the PRTR has been included in the table in Appendix 1.
1 | Irish Water
2.2 Review outcome of Desktop study
Full characterisation of the primary discharge has been achieved for all priority substances included
in Appendix 1. Priority substance concentrations were available for all parameters based on either
analysis or the EPA PRTR toolkit.
A review of the national monitoring programme for priority substances in wastewater is proposed
to be undertaken by Irish Water in 2016 in consultation with the EPA. It is proposed that this review,
in consultation with the EPA, will determine the scope of future Priority Substances monitoring at
Irish Water WWTP’s.
3
Assessment of Significance and Recommendations
An assessment of the potential for impacts on receiving waters from priority substances in the
primary discharge has been carried out. The assessment considers the primary discharge relevant to
Environmental Quality Standards (EQS) for priority substances in surface waters, as set out in the
European Communities Environmental Objectives (Surface Waters) Regulations 2009, as amended.
No parameters have been identified as potentially being higher than the required EQS following
dilution therefore no impact on the receiving waters is anticipated.
Based on the assessment carried out it is not considered that any further sampling or analysis is
required.
The EPA have prepared a report on priority substances, An Inventory of Emissions to Waters in
Ireland. This document states that Ireland appears to have relatively few problems associated with
the presence of Priority / Priority Hazardous substances in its surface waters. It identifies that
wastewater discharges are a potential source of metals in receiving waters with lead being the main
metal identified as associated with wastewater discharges. However, metals exceedences, in
particular those for cadmium, lead, and nickel are primarily associated with areas of historic mining
activity. Similarly PAH’s have been identified in stormwater overflows but the most significant
source is considered to be rainfall.
A consultation process with the EPA is being undertaken by Irish Water to establish appropriate
levels of monitoring for priority and dangerous substances nationally, taking into account the
particular requirements of the Water Framework Directive. This will allow a targeted monitoring
programme to be undertaken in areas where priority substances have been identified or industrial
discharges or imports provide a potential source, and where there is a shortfall of existing
monitoring data.
2 | Irish Water
Does the assessment use the Desk Top Study Method or Screening
Analysis to determine if the discharge contains the parameters in
Appendix 1 of the EPA guidance
Desk Top Study
Does the assessment include a review of licensed / authorised inputs
to the works?
Yes
Does the assessment include a review of other (unauthorised) inputs to
the works?
Yes
Does the report include an assessment of the significance of the
results where a listed material is present in the discharge? (e.g. impact
on the relevant EQS standard for the receiving water)
Does the assessment identify that priority substances may be
impacting the receiving water?
Does the Improvement Programme for the agglomeration include the
elimination / reduction of all priority substances identified as having an
impact on receiving water quality?
3 | Irish Water
Yes
No
No
Appendix 1 – Screening of Parameters for Priority Substances
AA:
MAC:
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
Annual Average
Maximum Allowable Concentration
Compound
Group of
AA-EQS
compounds Inland SW
(µg/l)
Benzene
Carbon tetrachloride
1,2-Dichloroethane
Dichloromethane
Tetrachloroethylene
Trichloroethylene
Trichlorobenzenes
Trichloromethane
Xylenes (all isomers)
Ethyl Benzene
Toluene
Naphthlene1
Fluoranthene1
VOCs
VOCs
VOCs
VOCs
VOCs
VOCs
VOCs
VOCs
VOCs
VOCs
VOCs
PAHs
10
12
10
20
10
10
0.4
2.5
10
n/a
10
2
8
12
10
20
10
10
0.4
2.5
10
n/a
10
2
PAHs
0.0063
0.0063
MAC of
0.017
MAC of 8.2
x 10-3
MAC of
0.017
MAC of 8.2
x 10-4
14 Benzo[k]fluoranthene2
15
1
2
Benzo[ghi]perylene2
PAHs
PAHs
AA-EQS
Other SW
(µg/l)
The EQS for these substances shall take effect from 22 December 2015
No indicative parameter is provided for this group of substances
4 | Irish Water
Measured
/Estimated
Conc.
(µg/l)1
Data Source
[Sample /
PRTR / Other
(state)]
Sample Date
(if applicable)
Effluent
Concentration
above AA
concentration
(Yes/No)
Effluent
Concentration
above AA
concentration
after dilution
(Yes/No)
No.
Compound
Indeno[1,2,316 c,d]pyrene2
17
Benzo[b]fluoranthene2
18 Benzo[a]pyrene
Di(2-ethylhexyl)phthalate
19
(DEHP)
20 Isodrin3
Dieldrin3
21
22
23
24
25
26
27
28
29
30
31
32
33
34
3
Diuron
Isoproturon
Atrazine
Simazine
Glyphosate
Mecoprop
2,4-D
MCPA
Linuron
Dichlobenil
2,6-Dichlorobenzamide
PCBs
Phenols (as Total C)
Group of
AA-EQS
compounds Inland SW
(µg/l)
Measured
/Estimated
Conc.
(µg/l)1
Data Source
[Sample /
PRTR / Other
(state)]
Sample Date
(if applicable)
Effluent
Concentration
above AA
concentration
(Yes/No)
Effluent
Concentration
above AA
concentration
after dilution
(Yes/No)
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
PAHs
PAHs
PAHs
Plasticiser
MAC of
0.017
1.7 x 10-4
MAC of
0.017
1.7 x 10-4
1.3
1.3
Pesticides
Pesticides
Pesticides
Pesticides
Pesticides
Pesticides
Pesticides
Pesticides
Pesticides
Pesticides
Pesticides
Pesticides
Pesticides
PCBs
Phenols
∑ of Aldrin, Dieldrin, Endrin and Isodrin.
5 | Irish Water
AA-EQS
Other SW
(µg/l)
∑=0.01
0.2
0.3
0.6
1
60 n/a
n/a
n/a
0.7
n/a
n/a
n/a
8
∑=0.005
0.2
0.3
0.6
1
n/a
n/a
n/a
0.7
n/a
n/a
n/a
8
No.
Compound
Group of
AA-EQS
compounds Inland SW
(µg/l)
35 Lead
36 Arsenic
37 Copper
Metals
Metals
Metals
38 Zinc
Metals
39 Cadmium
Metals
40 Mercury
Metals
41
42
43
44
45
46
47
48
49
50
51
52
53
54
Metals
Metals
Metals
Metals
Metals
Metals
Metals
Metals
Metals
Metals
General
General
General
General
General
Chromium VI
Selenium
Antimony
Molybdenum
Tin
Barium
Boron
Cobalt
Vanadium
Nickel
Fluoride
Chloride
TOC
Cyanide
Conductivity
6 | Irish Water
1.2
25
5 or 302
8 or 50 or
1003
0.08 or
0.09 or
0.15 or
0.254
MAC of
0.07
3.4
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
4
500
n/a
n/a
10
n/a
AA-EQS
Other SW
(µg/l)
Measured
/Estimated
Conc.
(µg/l)1
Data Source
[Sample /
PRTR / Other
(state)]
Sample Date
(if applicable)
Effluent
Concentration
above AA
concentration
(Yes/No)
Effluent
Concentration
above AA
concentration
after dilution
(Yes/No)
n/a
n/a
n/a
n/a
1.3
20
5
40
0.2
MAC of
0.07
0.6
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
8.6
1,500
n/a
n/a
10
n/a
No.
Compound
Hardness (mg/l CaCO3)
pH
Notes:
Group of
AA-EQS
compounds Inland SW
(µg/l)
General
General
n/a
n/a
AA-EQS
Other SW
(µg/l)
n/a
n/a
Measured
/Estimated
Conc.
(µg/l)1
Data Source
[Sample /
PRTR / Other
(state)]
Sample Date
(if applicable)
Effluent
Concentration
above AA
concentration
(Yes/No)
Effluent
Concentration
above AA
concentration
after dilution
(Yes/No)
n/a
n/a
n/a
n/a
1. Where measured values are available these should be used instead of estimated values from PRTR tool.
2. In the case of Copper the value 5 applies where the water hardness measured in mg/l CaCO3 is less than or equal to 100; the value 30 applies where
the water hardness exceeds 100 mg/l CaCO3. Estimated CaCO3 value > 100 where no sampling data available (based on PRTR tool)
3. In the case of Zinc, the standard shall be 8 μg/l for water hardness with annual average values less than or equal to 10 mg/l CaCO3, 50 μg/l for
water hardness greater than 10 mg/l CaCO3 and less than or equal to 100 mg/l CaCO3 and 100 μg/l elsewhere. Estimated CaCO3 value > 100 where
no sampling data available
4. For Cadmium and its compounds the EQS values vary dependent upon the hardness of the water as specified in five class categories (Class 1: <40
mg CaCO3/l, Class 2: 40 to <50 mg CaCO3/l, Class 3: 50 to <100 mg CaCO3/l, Class 4: 100 to <200 mg CaCO3/l and Class 5: _200 mg CaCO3/l)
7 | Irish Water
Appendix 2 – Priority Substance Screening Flowchart
A flow chart for the screening of the presence of organic compounds and metals (Priority
Substances) from WWTP is included below. This flowchart shows that appropriate screening has
been demonstrated in line with the assessment undertaken in this report.
Full Characterisation
8 | Irish Water
Appendix 3 – Receiving Waters Priority Substance Data
No Data Available
9 | Irish Water

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