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Our Ref: ES/MH/MMcD 5270-04-01

23 July, 2009

Mr Patrick Morris C/O Administration Office of Climate, Licensing & Resource Use Environmental Protection Agency

McCumiskey House

Richview Clonskeagh Road DUBLIN 14

Re: D0262-01 Starnullen Aqqlorneration Notice in Accordance with Requlation 18(3)(b), Waste Water Discharqe (Authorisation)

Requlations 2007 (S.I. No. 684 of 2007). dated 03 June 2009

Dear Mr Morris,

I refer to your Notice in Accordance with Regulation 18(3)(b) Waste Water Discharge (Authorisation) Regulations 2007 which issued to Mr. Gerry Boyle, Meath County Council, dated 03 June 2009, in

relation to Starnullen Agglomeration (EPA Reference No. D0262-01).

The notice requested the supply of sixteen points of outstanding information, to allow Article 16

Compliance. The sixteen points of information requested and our response to each are presented

below:

Directors: D.A. Downes (Chairman) L.E. Waldron (Managing Director) M.F. Garrick R.F. Tobin J. Colleran B.J. Downes S. Finlay P.J. Fogarty

D. Grehan J.P. Kelly B.M. Mulligan B. Murray C. O'Keeffe F. Renkema (Dutch) E.J. Harrigan (Company Secretary) I

Assacmtes: T. Cannon P. Cloonan D. Conneran M. Conroy T Curran 0 . Downes B. Gaflney B. Gallagher B. Heaney ((p ENGINEERS B H ~ t ~ h i n s o n D. Kennedy M. McDonnell C. McGovern E. McPartlin G. Stevenson I IRELAND

CO Reg. No 42654 - Reg~stered Offlce: Fargreen House, Falrgreen Road. Galway, Ireland

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Section A: Non-Technical Summary

7. Update the non-technical summary to reflect the information provided in response to

this notice.

Please find appended to this correspondence an updated non-technical summary, which reflects the

information provided in this response (Refer to Appendix A).

Section 6: General Information

2. The relevant class of waste water discharge for this agglomeration is 'Discharges from

agglomerations with a population equivalent of 2,007 to 10,000'. As the 2009 population equivalent is 3,076, please make arrangements to pay an additional €70,000

as the correct fee is €25,000.

Please find attached herewith, cheque made payable to Environmental Protection Agency for

€1 0,000.00 with respect to Stamullen Wastewater Discharge Application.

Section C: Infrastructure and Operation

3. As the 2009 population equivalent (p.e.) is 3,076 and the design p.e. of the waste water treatment plant is 2,300 p.e., provide details of plans, if any, to upgrade the plant.

As the existing population equivalent served by Starnullen Wastewater Treatment Plant exceeded the

original design capacity of the plant, certain modifications were implemented by Meath County Council in order to increase that capacity above the originally constructed 2,300 P.E. plant. These modifications were detailed in Attachment B.g(ii) of the original application. Plant modifications

included the provision of additional aeration to the existing aeration basins to increase the treatment capacity in the basins. In addition, it is noted in (Attachment B.S(ii)) that the final clarifiers at

Stamullen are already of a capacity that can easily cater for the actual measured 3 DWF for 2009.

Hence, while the existing plant was originally constructed to cater for 2,300 P.E., recent plant modifications have increased the secondary treatment capacity at the site.

In terms of future upgrades, Attachment B.10 of the original application refers to Meath County

Council's efforts at obtaining funding for a WWTP in the East Meath Area, which would inter alia serve Stamullen. It would therefore be Meath County Council's aim to have the above scheme

included in the next Department of Environment, Heritage and Local Government Water Services Investment Programme.

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4. Provide design discharge concentrations for the waste water treatment plant (BOD,

COD, Suspended Solids, Total Nitrogen as N, Ammonia as N and Total Phosphorus as

P) .

The existing wastewater treatment plant was upgraded / commissioned in 2002. The design

discharge concentrations for the upgraded (2,300 P.E.) Stamullen Treatment Plant are as follows:

7 Stamullen Wastewater Treatment Plant - Design Discharge Concentrations

5. Justify your conclusion that the storm water overflow complies with the definition of a

storm water overflow as per 'Procedures and Criteria for Storm Water Overflows',

published by the Dept of the Environment, 1995 as stated in Table E.l(iiJ, be. provide

details of any hydraulic modelling, discharge monitoring/inspection data or design

frequency of storm water overflow.

Parameter

B' - C - Total Suspended Solids

Total Nitrogen (as N)

Ammonia (as N)

Total Phosphorus (as P)

In Section G.4 of the original application, we confirmed (as requested in that application) that the storm water overflow complies with the definition of 'storm water ovefflow' as per Regulation 3 of the

Waste Water Discharge (Authorisation) Regulations, 2007, that definition being:

Design Discharge Concentration (mgll)

10.0

125.0*

10.0

no concentration specified

3.0

2.0

"Interpretation

3.... "storm water oveflow" means a structure or device on a sewerage system designed and constructed for the purpose of relieving the system of excess flows that arise as a result of rain water or melting snow in the sewered catchment, the excess flow being discharged to receiving waters;"

-

.COO was not a primary design cansideration due to non-industrial nature of agglomeration, therefore quoted at UWWT standards

The 'Urban Waste Water Treatment Directive (91/271/EEC) - Procedures and Criteria in relation to

Storm Water Overflows' document [DoEHLG, 19951 does not contain a formal definition of 'storm water overflow' hence we have not referred to any definition contained therein. However, this

particular document does outline 'options following assessment' of a storm water overflow, which may include:

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".........upgrading of the existing system .........." and other options including "use of storage" and '2ctive control':

Attachment C.2 identifies the 1 nr. existing storm water overflow on the Stamullen Sewerage System. Attachment G.4 of the original application contains the measures that have been previously

undertaken to minimise storm water overflows at Stamullen, which correspond with the above options referenced in the Department publication.

Attachment C.1 details the permanent plant storm water control facilities currently in place at Starnullen. Permanent plant includes fine and coarse screening facilities and a 300m3 stormwater

holding tank. The plant has been designed such that flows in excess of 3DWF and up to 12DWF are

diverted to the storm water holding tank. The storm tank has been designed for up to 2 hours retention at 9 times design DWF.

There is currently no data available with regards to hydraulic modelling for Stamullen. Discharge monitoring of storm water overflows at Stamullen has not been undertaken previously.

6. Clarify type of effluent sampling facilities (including flow rate) provided at the waste water treatment plant.

Influent samples are currently obtained via grab sampling techniques. Final effluent samples are currently obtained with the use of a portable composite sampler. Influent I effluent sampling is undertaken on a monthly basis at present. Continuous flow monitoring occurs at the inlet to the

works.

7. Clarify the arrangement for out of hours supervision of the waste water treatment plant.

Stamullen Wastewater Treatment Plant is equipped with telemetry, which is linked back to a main

server in the County Hall in Navan. In the event of plant failure, a text alert is sent to a nominated maintenance person, and also to a second person, in the unlikely event that there would be no response from first nominated person.

8. Clarify what is the future plan for sludge dewatering as the sludge is currently being dewatered on site via a mobile sludge dewatering unit.

Future plans for sludge dewatering will coincide with future plans for an East Meath WWTP to serve Stamullen, Gormanstown and the Mosney areas. It is likely that sludge dewatering facilities would be included in any proposed plant for the area.

At present, sludge dewatering is undertaken via the mobile unit. Should this arrangement be altered, Meath County Council will provide the Agency with relevant details.

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Section D: Discharqes to the Aquatic Environment

9. Provide date(s) when all monitoring as reported in Table D.l(i)(b) and Table D.l(i)(c)

was carried out.

Monitoring on the Stamullen Primary Discharge Point, as reported on Table D.l(i)(b) and Table D.1 (i)(c) of Stamullen Waste Water Discharge Licence Application was carried out on 15/01/09.

Section E: Monitorinq

10. There was no assimilative capacity calculations submitted in the application. Provide

assimilative capacity calculations (BOD, Total Nitrogen as N, Ammonia as N, Orthophosphate) for the primary discharge to the Millrace.

Please refer to Appendix B and C for waste water assimilative capacity calculations.

11. Clarify why the temperature reading was 0°C on primary, upstream and downstream monitoring.

The temperature reading was recorded as 0°C on Primary Discharge Point Monitoring (Table D.l(i)(b)), Surface Water Monitoring Downstream of Primary Discharge Point - aSW-Id (Table

F.l(i)(a) and Surface Water Monitoring Upstream of Primary Discharge Point - aSW-lu (Table F.l(i)(a), as a default value since temperature was not recorded at the time of sampling at these locations. Ideally, the temperature reading should have been lefl blank, but the EPA Web Based

Data Input Tool would not allow any blank inputs, so a zero (0) reading was submitted in its place.

12. Provide primary discharge monitoring data for 2009 to date. (BOD, COD, Total

Suspended Solids, Total Phosphorus, Total Nitrogen, Ammonia).

The Primary Discharge Monitoring Data for 2009 to date is attached in Appendix D, for BOD, COD, Total Suspended Solids (TSS), Total Phosphorus (Tot P) and Total Nitrogen (Tot N). Ammonia

concentrations have not been recorded to date.

13. Provide an explanation for why the Total Phosphorus concentrations in the primary

discharge in 2008 were greater than the design concentration of 2mg/l, and for exceedences in BOD, COD and Suspended Solids concentrations (Attachment E4 'Stamullen Effluent Monitoring 2008, 23 Jan 08 to 05 Dec 081.

As stated in Attachment E.4 -Details of Compliance with Any Applicable Monitoring Requirements

and Treatment Standards, of the Stamullen Wastewater Discharge Licence Application, the treatment

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plant at Stamullen was designed to treat effluent to a 10:lO standard (i.e. BOD < 10mgll & SS < 10mgll). Phosphorus removal is also included at the plant, which was designed to bring final effluent

to at least a concentration of 2mgIl Total Phosphorus.

This above limit for Total Phosphorus concentration in the final treated effluent was not exceeded on

any monitoring occasion in 2007. It was exceeded on six monitoring occasions in 2008, with concentrations ranging from 2.04 - 3.51mg11 and has been exceeded on 3 no. monitoring occasions for 2009, to date (concentrations ranging from 2.64 - 3.92mgll). (2009 Primary Discharge Monitoring Data attached in Appendix D).

Phosphorus reduction is achieved at the Stamullen WWTP using Dosing with Spent Pickle (high in iron salts and a waste by-product of the galvanising industry). However, it would appear that the

dosing regime would need greater management and fine-tuning in order to achieve the required

discharge limit of 2mgIl. This may involve the future use of ferric sulphate, in the place of the Spent Pickle. Meath County Council intends to set up stricter management procedure for the dosing regime at the plant, to come into effect immediately. This management procedure will include monthly

monitoring of the Primary Discharge from the plant (for Total Phosphorus concentrations), to ensure

Total Phosphorus concentrations in the final treated effluent are consistently below 2mgll.

The Urban Waste Water Treatment Regulations, 2001 sets the following discharge limits for treated

effluent from Urban Waste Water Treatment Plants: BOD <25mg11, COD <125mg11 and Total Suspended Solids <35mg11.

Based on the above discharge limits, in 2007, there were no exceedences for BOD or COD recorded and 2 no. exceedences for Suspended Solids recorded. In 2008, 4 no. BOD exceedences were

recorded, 2 no. COD exceedences were recorded and 2 no. Suspended Solids exceedences recorded. To date, in 2009, no exceedences have been recorded for BOD, COD or Suspended Solids.

The above exceedences of BOD, COD & Suspended Solids in 2007learly 2008 may have been

related to the Hydraulic and Organic overloading of the plant.

The existing Starnullen plant was originally designed for a capacity of 2,300 P.E. capacity. It is

estimated that Stamullen WWTP is currently sewing an existing population equivalent of 3,076. The

calculated population equivalent to be contributed to the waste water works as a result of pending development (planning permissions already granted) is 98 P.E. By including this pending

contribution, Stamullen WWTP may be required to cater for 3,174 PE in the short term.

The exceedences recorded in 2007 & early 2008 were noted by Meath County Council, who at the

time instigated remedial works at the plant by way of installing additional aeration capacity in the

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aeration basins. Improved results for late 2008learly 2009 indicate that this issue has been

adequately resolved following this action.

In addition, the hydraulic capacity of the final clarifiers (in terms of allowable surface loadings and

weir overflow rates) was checked against the actual measured 3 DWF for 2009. These units are

currently operating within the allowable restraints.

Continued monitoring of the final effluent will be necessary at Stamullen Waste Water Treatment

Plant in order to continually verify that the above issues have been adequately dealt with (in providing

increased aeration to the plant), however in looking to the more recent effluent monitoring data and

receiving water quality downstream of the discharge, it can be reasonably assumed that, at an

additional plant loading of 98 P.E. (resulting from pending development), the existing recently-

modified works will accommodate this extra loading without posing an environmental risk to the

receiving water habitat.

14. Clarify the 95-percentile flow and DWF of the Mill Race and of the River Delvin.

DELVIN RIVER FLOWS

The estimated long-term flows in the Delvin River at co-ordinates E 315187 N 265878 are as follows:

I Estimated River I Estimated Based on: I Flow Value I

I analysis

Flow 95 percentile

D WF

The above flow rates are the best available estimates, as provided by the EPA Office of Environmental Assessment.

Mill Race Flows

EPA Station 08002 & Catchment comparative analysis

EPA Station 08002 and Catchment comparative

A request was placed with the EPA Office of Environmental Assessment for the statistical flow rates

in the Mill Race to which the Stamullen WWTP discharges. The EPA responded that no flow measurements were taken in the Mill Race and the catchment area to the point of the existing

discharge lies outside the scope of the hydrometric model.

0.0640 m3/s.

0.0366 m3/s

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Section G: Programme of Improvements

15. Provide an update on progress with a feasibility study and funding request for a new waste water treatment plant in the East Meath Area to serve Stamullen, Gormanstown and Mosney.

Attachment 8.10 of the original application states that Meath County Council in conjunction with Louth County Council, plan to appoint consultants for the preparation of a feasibility study (with appointment by year end 2009). It will be the Council's aim to have the above scheme including in

the next DoEHLG Water Services Investment Programme.

This remains the case.

Section H: Declaration:

16. Complete Section H: Declaration and scan the signed declaration for electronic

submission.

The 'Section H - Signed Declaration' from the Stamullen Agglomeration - Wastewater Discharge Licence Application, is attached in Appendix E, with an electronic copy attached on the CD which

accompanies this submission.

Advice Note: In the case where any drawings already submitted are subject to revision consequent on this request, a revised drawing should be prepared in each case. It is not sufficient to annotate the original drawing with a textual correction. Where such revised drawings are submitted,

provide a list of drawing titles, drawing numbers and revision status, which correlates the

revised drawings with the superseded versions.

No drawings from the original Stamullen Waste Water Discharge Licence Application were revised in

the completion of this response, nor were any new drawings issued.

I do hope the above adequately deals with the outstanding information required by the EPA's Notice in Accordance with Regulation 18(3)(b) Waste Water Discharge (Authorisation) Regulations 2007,

dated 03 June 2009.

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Should you require any additional information, or further clarification, please feel free to contact the undersigned.

Yours sincerely,

Ms Maria Holmes Engineer

-LUI(,

Dr Emma Sweeney Senior Environmental Scientist

cc. Mr Gerry Boyle, Meath County Council

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APPENDIX A (Updated Non-technical Summary)

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NON-TECHNICAL SUMMARY

[Revision 61

Meath County Council, County Hall, Navan, County Meath is making an application

to the Environmental Protection Agency (the Agency), in accordance with the Waste

Water Discharge (Authorisation) Regulations. 2007 (S.I. No. 684 of 2007) for a

Waste Water Discharge Licence, authorising the waste water discharges from the

Stamullen Waste Water Treatment Works, serving the agglomeration of Stamullen,

County Meath.

The agglomeration is served by the Stamullen Waste Water Treatment Plant,

Gormanstown Road, Stamullen, County Meath (Grid Reference 315133E, 265890N),

as shown on Drawing 5270-2620. Stamullen Waste Water Treatment Plant utilises

biological processes in conjunction with physical settlement, and nutrient removal to

provide treatment to incoming waste water for compliance with the relevant

legislative effluent treatment standards, as shown on Drawing no. 5270-2628 & 5270-

2929.

The existing wastewater treatment plant was upgraded 1 commissioned in 2002. The

design discharge concentrations for the upgraded (2,300 P.E.) Stamullen Treatment

Plant are as follows:

Stamullen Wastewater Treatment Plant - Design Discharge Concentrations

quoted at sta standards

Parameter

BOD

COD

Total Suspended Solids

Total Nitrogen (as N)

Ammonia (as N)

I Total Phosphorus (as P)

The existing treatment works is supervised during the hours of 8.00 - 15.30 Monday

to Friday and 10.00 - 12.00 at Weekends. Stamullen Wastewater Treatment Plant is

equipped with telemetry, which is linked back to a main server in the County Hall in

Navan. In the event of plant failure, a text alert is sent to a nominated maintenance

Design Discharge Concentration (mgll)

10.0

125.0*

10.0

no concentration specified

3.0

2.0 'COD was not a primary design consideration due to non-industrial nature of agglomeration, therefore

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person, and also to a second person, in the unlikely event that there would be no

response from first nominated person.

At present, Stamullen Agglomeration has 3 no. existing discharge points: a Primary

Discharge Point (SWI), at location 315169E, 265889N, which discharges into a mill

race leading to the Delvin River (as shown on Drawing No. 5270-2624), a Secondary

Discharge Point (SW2) at location 315148E, 265874N, which discharges into a mill

race leading to the Delvin River (as shown on Drawing No. 5270-2625) and a Storm Water Overflow Discharge Point (SW3), at location 315143E, 265862N, which

discharges into a mill race leading to the Delvin River (as shown on Drawing no. 5270-2626).

Based on Effluent (Primary Discharge Point) Analysis presented on Tables D.l(i)(b)

& D.l(i)(c) and on the analysis of water upstream and downstream of the Primary

Discharge Point (Tables F.l(i)(a) & F.l(i)(b)), it is concluded that none of the

substances listed in Annex X of the Water Framework Directive (2000160lEC) or any of the Relevant Pollutants listed in Annex Vlll of the Water Framework Directive

(20001601EC) are being discharged from the waste water works or are seen to be

present in the receiving water environment downstream of a discharge from the works, at concentrations above the standards set in the Water Quality (Dangerous

Substances) Regulations, 2001 (S.I. 12 of 2001).

The emissions from the agglomeration are not expected to have any significant

impact on the surrounding environment:

All 3 number emissions discharge into a mill race immediately upstream of the Delvin River, which has no European Site Designation.

There are no emissions to groundlgroundwater from the Stamullen Sewerage

Agglomeration; therefore any impact on groundlgroundwater is unexpected.

The results of water quality analysis presented in Tables F.l(i)(a) & F.l(i)(b) show that there is little or no difference in water quality between the sampling

location upstream of the emission points (aSWlulaSW2u) and the sampling

location downstream of the emission points (aSWldlaSW2d).

The EPA monitor water quality in the Delvin River at stations upstream and

downstream of the Stamullen Sewerage Agglomeration. The closest EPA

station upstream of the agglomeration has a most recent Q-Value rating of Q-

4 (=good water quality, unpolluted) as does the closest EPA station

downstream of the agglomeration. This is another indication that the effluent

discharges from the Stamullen Sewerage Agglomeration are not having a

negative impact on the Delvin River.

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There are no Meath County Council Drinking Water Abstraction Points

located downstream from the Stamullen Agglomeration Primary Discharge

Point.

Once the Waste Water Discharge Licence is issued for the Stamullen Agglomeration.

the 'Programme for Environmental Monitoring' is proposed to continue in much the same way as it has done for the last 2 years. This will involve monitoring of the

Influent to the Waste Water Treatment Plant and the Effluent from the Waste Water

Treatment Plant (i.e. Primary Discharge Point) on a monthly basis for the following

parameters: BOD, COD, Total Suspended Solids (TSS), Total Phosphorus as P, Orihophosphate as P & Total Nitrogen as N.

The Waste Water Discharge (Authorisation) Regulations, 2007 (S.I. No. 684 of 2007)

also requests water sampling of the aquatic environment into which the Primary and

Secondary Discharges occur, in order to monitor the impact of the discharges on the

ambient environment.

For the last number of years, the County Council have carried out monthly monitoring upstream and downstream of the primary/secondary/storm water overflow discharge

pointslmillrace confluence with Delvin River, at the EPA Station Locations

08D010300 and 08D010400, as shown on Drawing No. 5270-2635. The results of

this analysis for 2007 & 2008 are presented in Attachment E.4. This sampling includes analysis for: Dissolved Oxygen (DO), Temperature, pH, Electrical

Conductivity, BOD, Suspended Solids, Ammonia, Total Organic Nitrogen, Nitrate,

Chloride, Alkalinity, Hardness, Colour, Copper &Zinc.

It is proposed to continue this monitoring upstream and downstream of the

primary/secondary/storm water overflow discharge points/millrace confluence with

Delvin River, but to move the downstream location to location aSWld, as shown on

Drawing No. 5270-2635, and to rename the upstream sampling location (which will remain at location of EPA Station 08D010300) as aSWlu.

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APPENDIX B (Waste Assimilative Calculations)

Termlale lel W4

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5270 Starnullen RFI

Stamullin Seweracle Scheme - Assimilative Capacity

1.0 Mass Balance Approach

The available waste assimilative capacity of the receiving water body was calculated using

the mass balance approach. The equation used in the calculations is:

WAC = (Cmax - Cback) X Q

Where:

WAC Waste Assimilative Capacity

C,,, Receiving water's maximum permissible concentration of a substance (mgll)

Cback Receiving water's background upstream concentration of a substance (mgll)

Q Flow rate in the receiving waters (m31s)

The flow conditions used in the calculation of assimilative capacity are dependent on the

particular water quality parameter being analysed. The EPA recommends the following

receiving water flow conditions to be used in the analysis of the following parameters:

A conversion factor is applied to the Mass Balance Formula so as to express the WAC in

units of kg I day.

Receiving Water Flow

Dry Weather Flow

Median Flow

95 percentile

Conversion Factor:

Parameter

Toxic substances

Ortho-phosphate (MRP)

Other substances (BOD, Ammonia N)

(mg)(nz3) kg 60 * 60 * 24 to- = = 86.4

(l)(s) day 1000

2.0 Relevant Documentation

The documentation used in the calculation of waste assimilative capacity of receiving waters

were as follows:

'Parameters of Water Quality - Interpretation and Standards' [EPA, 20011.

'S.1 No. 258 of 1998 - Local Government (Water Pollution) Act, 1977 (Water Quality

Standards for Phosphorus) Regulations, 1998' (setting the maximum concentration of

Ortho-phosphate that may be present in the receiving waters).

Appendix B

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5270 Stamullen RFI

. Meath County Council released a report in 2006 entitled 'Phosphorus Regulations

Implementation Report 2006' which was prepared in accordance with the

requirements of the S.I. No. 258 of 1998 - Local Government (Water Pollution) Act,

1977 (Water Quality Standards for Phosphorus) Regulations, 1998.

3.0 Existing Water Quality of the Millrace and Delvin River

The existing water quality of the Delvin River is presented in Sections E and F of the

Stamullen Waste Water Discharge Licence Application.

Section E4 contains a table of Meath County Council's monitoring water quality results for

various parameters present in the Delvin River at the EPA Stations located upstream and

downstream from confluence of the Mill Race to the Delvin River.

Section F presents surface water monitoring results from a once-off sampling event at a

location upstream and downstream from the confluence of the Mill Race to the Delvin River.

Appendix C contains waste assimilative calculations, based insofar as possible on the above

monitoring data.

No upstream or downstream sampling was carried out on the Mill Race. The Mill Race

extends for approximately 40m before merging with the River Delvin.

4.0 Discharge Effluent Quality

Meath County Council has carried out monitoring of effluent discharge from the WWTP on a

monthly basis over the last number of years and the results from these samples are contained

in Section E4 of the Stamullen Waste Water Discharge Licence Application.

5.0 Maximum Permissible Concentrations of Various Parameters for the Mill Race and Delvin River

The Mill Race or the Delvin River is not classified as nutrient sensitive under the Urban Waste

Water Treatment Regulations 2001 (S.I. No. 254 of 2001) and has no designation of

ecological significance.

With reference to the Eastern River Basin District - Draft River Basin Management Plan, the

Mill Race and Delvin River is not designated as Salmonid Water under the Freshwater Fish

Directive (781659lEEC) and it is not classified as RPA Drinking Water (River).

The following maximum permissible concentrations therefore apply to the receiving waters:

2 Appendix B

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5270 Starnulien RFI

Substance

BOD

Total Nitrogen (N)

Ammonia

-- -

Maximum

Permissible

Concentration

~5 mgll

Regulations, 1998

Reference Document

European Communities (Quality of Salmonid Waters)

Regulations, 1998 (S.1 No. 293 of 1988)

No Applicable Surface Water Standard for Total Nitrogen

1 mg/l

0.05 mgll

7.0 Assimilative Capacity Calculations

(N)

European Communities (Quality of Sairnonid Waters)

Regulations, 1998 (S.1 No. 293 of 1988)

s.1 NO. 258 of 1998 -Local Government (Water Pollution)

Act, 1977 (Water Quality Standards for Phosphorus)

The following sections provide a summary of the assimilative capacity calculations of BOD,

Ammonia and Orthophosphate for the Delvin River at the location upstream of the Starnullen

WWTP primary discharge point.

As it was not possible to obtain flow estimates for the Mill Race into which the WWTP

discharges, it was not possible to carry out assimilative capacity calculations for the Mill Race.

7.1 Available WAC of the Delvirz River for BOD

The WAC equation for calculating BOD concentrations is:

WAC = (C,,r Cback) x Q95 x 86.4 kg BOD/day

WAC = (5-1.648) x 0.035 x 86.4 kg BOD/day

WAC = 10.14 kg BOD/day

At a discharge of 777.6 m31d (existing DWF effluent discharge) together with the design

effluent maximum concentration of BOD concentration emitted from the WWTP of 10 mgll,

the total maximum discharge BOD concentration to the River is:

777,600 lld x 10 mgll = 7,776,000 mgld = 7.8 kgld

7.2 Available WAC of tlie Delvin River for Total Nitrogen, N The development of WAC calculations relating to Total Nitrogen (as N) were not possible as

there is no applicable surface water standard for Total Nitrogen (N).

Appendix B

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5270 Stamullen RFI

There are currently no design discharge concentrations for Total Nitrogen relating to the

Stamullen Wastewater Treatment Plant. The existing DWF effluent discharge has been

estimated at 777.6 mVd. The level of Total Nitrogen (as N) recorded in the primary effluent

on January 15 '~ 2009 was 16.0mgll N.

777,600 lld x 16 mgll = 12,441,600 mgld = 12.442 kgld

7.3 Available WAC of the Delvirt River for Antrtzorlin, N The WAC equation for calculating Ammonia concentrations is:

WAC = (C,,, - Cback) x Q95 x 86.4 kg N/day

WAC = (1-0.2) x 0.035 x 86.4 kg N/day

WAC = 2.42 kg N/day

At a WWTP discharge of 777.6 m31d (existing DWF effluent discharge) together with the

design discharge concentration of Ammonia emitted from the WWTP of 3 mgll, the total

discharge Ammonia concentration to the River Delvin:

777,600 lld x 3.0 mgll = 2,332.800 mgld = 2.333 kgld

7.4 Available WAC of the Delvirr River for Ortl~ophosphate As median flow data was not available for this river, it was not possible to calculate the

assimilative capacity in terms of orthophosphate.

7.0 Summary of Results and Conclusion Flow data sets are not available for the Mill Race to which the WWTP discharges and as such

it is not possible to carry out assimilative capacity calculations on the Mill Race. The Mill Race

however is located just 40m upstream from the Delvin River and assimilative capacity

calculations have been carried out on the River, the results of which are given below:

Given the current 95 percentile flow rate in the River Deivin and the background

concentrations of BOD and Ammonia together with the design discharge concentrations at

Stamullen WWTP, it is concluded the discharge from the Stamullen WWTP is not having a

negative effect on the River Delvin in terms of these parameters.

Parameter

BOD

Total Nitrogen (N)

Ammonia

Ortho-phosphate

4 Appendix B

WAC Delvin River

10.14kg BODlday

WAC not possible due to lack of Quality Standard

2.42 kg Nlday

no flow data available

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APPENDIX C (Waste Assimilative Design Spreadsheets)

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Waste Asdmllative Capacity Formula

]WAC = ( C A N -Cm ) *Q I l~onverslon Factor

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APPENDIX D (Primary Discharge Monitoring Data for 2009)

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STAMULLEN 'EFFLUENT' MONITORING 2009 I I I I I I

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APPENDIX E (Section H - Signed Declaration)

(From Original Stamullen Waste Water Discharge Licence Application)

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SECTION H: DECLARATION

Declaration

1 hereby make application for a waste water discharge licencelrevised licence, pursuant to the provisions of the Waste Water Discharge (Authorisation) Regulations, 2007 (S.I. No. 684 of 2007).

I certify that the information given in thls applicati~n is tmthiul, accurate and complete.

I give consent to the EPA to copy thls application for its own use and to make it available for lnspectlon and copying by the public, bath in the form of paper flles available for inspectlon at EPA and local authority offices, and via the EPA's website.

\ This consent relates to this application itself and to any further Information or submission, whether provided by me as Applicant, any person acting on the Applicant's behalf, or any other person.

Signed by : Date : \7 \OX 1 0 ~ (on behalf of the anisatlon)

Print signature name: EUGEt\lE CUMMIQS

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