attachment g › licences › lic_edms › 090151b2802c705e.pdf · 2013-07-26 · mh. s13-s02 300...

Kerry County Council- Waste Water Discharge Licence Application for Abbeydomey Agglomeration.

Kerry County Council

Waste Water Discharge Licence Application

for

Abbeydorney Agglomeration

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WWD App/iCiJlion Fonn VeJSion 6/08Kerry County Council - Abbeydomey Agglomeration.

SECTION G: PROGRAMMES OF IMPROVEMENTS

Advice on completing this section is provided in the accompanying GuidanceNote.

G.! Compliance with Council DirectivesProvide details on a programme of improvements to ensure that emissions fromthe agglomeration or any premises, plant, methods, processes, operatingprocedures or other factors which affect such emissions will comply With, or willnot result in the contravention of the;

• Dangerous Substances Directive 2006/11/EC,• Water Framework Directive 2000/60/EC,• Birds Directive 79/409/EEC,• Groundwater Directives 80/68/EEC & 2006/118/EC,• Drinking Water Directives 80/778/EEC,• Urban Waste Water Treatment Directive 91/271/EEC,• Habitats Directive 92/43/EEC,• Environmental Liabilities Directive 2004/35/EC,• Bathing Water Directive 76/160/EEC, and• Shellfish Waters Directive (79/923/EEC).

Attachment G.l should contain the most recent programme of improvements,including a copy of any approved funding for the project and a timeframe forthe completion of the necessary works to take place.

IAttachment included

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WWD Application Form Version 6/08Kerry County Council - Abbeydorney Agglomeration.

Attachment G.l Compliance with Council Directives

NEnNORKIMPROVEMENTS

The proposed scheme for Abbeydorney village will provide separate foul and stormnetworks which will adequately cater for the future demand from the village in thedesign horizon 2006-2026.The network which is identified below will be completedin two phases. Phase 1 will cater for the existing population and Phase 2 isintended to facilitate possible future development.

TREATMENT WORKS

It is proposed to construct a new wastewater treatment plant to the north-east ofthe village. The plant will be constructed in two phases. Phase 1 is designed tocater for a population equivalent of 2,000 and Phase 2 is to cater for a further 1,000PE thereby ultimately providing capacity to cater for a population equivalent of3,000. An extended Aeration Plant is the recommended method of treatmentas it provides the most cost effective solution for producing an effluent quality whichwill meet the required regulatory standards.

The treated effluent will be discharged from the WWTP site to the preferredlocation of discharge along the Shannow River.

PROPOSED FOUL NEnNORK

The completion of the foul collection network shall be split into two (2) phases.Phase 1 will cater for the existing population with sufficient surplus capacity to caterfor the projected 2026 population.Phase 2 will facilitate future development within the development boundarydetermined in Section 4.2. The layout of the proposed network is shown onDrawing No 02 and 03 with longitudinal sections provided on Drawings 05 - 07.

In addition to catering for future demand from the area within the defineddevelopment boundary, remedial works to the existing system that were identifiedin Section 3 will also be attended to as part of the proposed network improvements.

Remedial Works to Existing Network

The remedial works and network improvements include:1. Replacing all existing 150 mm diameter sewers with 225 mm diameter pipework.Table 1lists the specific sewer runs that are intended to be replaced as part of Phase 1 ofthe scheme.

tD't 225T bl 1 Ua e Jpslze 0 mm lame erSewer Run Diameter Length

Upgrade (m)(mm)

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MhF28- 150mm to 225 439MhF21 mmMhF49 - 150mm to 225 630MhF21 mmMhF40 - 150mm to 225 58MhF21 mmTotal 1,127 m

Future Loading And Sewer Upgrades

Drawing 02 details the proposed foul sewer layout and includes upsizing of existingsewer runs to cater for existing and future population.

Table 2 identifies the sections of sewers pipe size upgrades, which form part of therecommendedworks.

Table 2: Upsize Pipe Diameter

Sewer Diameter LengthRun (mm) (m)

Mh. F21- 225mm to 210F18 375mmTotal 210 m

Proposed Foul Collection System-Phase 1

In addition to completing remedial works and upsizing of existing sewer runs it isproposed to lay a new foul network to service existing developments within theproposed boundary. The proposed sewer layout is shown on Drawing No. 02. Thesewers shall comprise of 225mm, 300mm. and 375 mm diameter pipes. specifics ofwhich are given in Tables 3 below. The sewer line between F65 and F62(210 lin.m) will require concrete surround, as the cover to the sewer is less than theminimum required.

Table 3: Proposed New Foul Sewers

Sewer Diameter LengthRun (mm) (m)

Mh. F01- 375 1,219F18Mh. F49- 225 70F50Mh. F65- 225 140F63Mh. F63- 300 630F11Mh. F16- 225 722F39

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ITotal I~781----

Proposed Foul Collection System-Phase 2

It is proposed to service future development to the south of the village, identified asPhase 2 on Drawing No 02, by extending the foul network a distance of 280 lin.mfrom Mh F50 to Mh F54. This extension is shown on Drawing No. 02. 8pecifics arelisted in Table 4 below.

t F I System2 E td Phrooose ase x enslon 0 ouSewer Diameter LengthRun Imml ImlMh. F50- 225 280F54Total 280m

Table 4 P

PROPOSED STORM NETWORK

The completion of the storm network shall be split into two (2) phases. Phase 1 willcater for the existing population with sufficient surplus capacity to cater for theprojected 2026 population. Phase 2 will facilitate future development within thedevelopment boundary.It is anticipated that storm water runoff from future residential developments will beattenuated to current greenfield levels and discharged either to the proposedPhase 1 storm system or directly to the Abbeydorney 8tream.

The layout of the proposed network is shown on Drawing No 03.It is recommended that all new surface water outfalls incorporate a hydrocarbonseparator and grit trap prior to discharging to receiving watercourses.

Storm Network- Phase 1

Main Village Collection System

It is proposed to construct a storm collection system to cater for run-off from areaswithin the existing developed area, and with sufficient capacity to accommodateadditional attenuated flow from future developments.

The proposed system consists of concrete pipes ranging from 225mm to 600 mmin diameter. Layout plan of the proposed system can be seen in Drawing 03 withdetails of the collection system listed in Table 5 below.

Table 5: Proposed Storm Collection System-Phase 1

Sewer Run Diameter Length(mm) (m-)

Mh.829-828 300 90Mh.828-827 375 90Mh.827-825 450 180Mh.824-819 375 460

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Mh. S19-S18 450 190Mh. S17-S15 300 180Mh. S14-S13 225 90Mh. S13-S02 300 90Mh. S12-S02 225 90Mh. S09-S08 375 540Mh. S08-S02 450 540Mh. S02- 600 90S01/0utfallTotal 2,080

Flows from existing development are designed to be discharged directly to eXistingwatercourses.

Phase 2 - Storm Network

Collection System - Phase 2

It is anticipated that a storm sewer to the south of the village along the Tralee Road(Ref Drawing 03) will be completed in conjunction with the development of zonedlands. It is expected that prospective developers will be required to provide thesestorm sewers or to pay a contribution to Kerry Co Council for their construction.

It is expected that planning conditions will require storm discharges from futuredevelopments to be attenuated to existing greenfield runoff levels prior todischarging to the proposed network or an existing watercourse. Drawing No 3indicates the points of discharge for future developments and the attenuationvolume required in instances where discharge to the proposed network has beenallowed for.Storm sewers to the south of the village along the Tralee Road are indicated onDrawing No 3 and listed in the following Table 6

Table 6 : Future Storm Sewers

Sewer Run Diameter LengthImm) 1m)

Mh. S11- 225 90S10

Mh. S10- 375 90S09

Total 180

INTRODUCTION

The proposed wastewater treatment plant is intended to cater for a designpopulation equivalent of 3,000. It is proposed to construct the treatment plant in twophases with the initial phase catering for a population equivalent of 2,000.

WASTEWATER TREATMENT LOAD

The design criteria for the new treatment plant are set out in Table 7 below.

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t PI td T tC't . f PT bl 7 Da e eSlan n ena or ropose rea men anParameter Unit Phase Phase 2

1 Extension

Population Eauivalent nr 2000 1000Per capita flow I/hd/d 180 180Dry Weather Flow m3/d 360 180Flow to Full Treatment m3/d 1080 5403DWFAverage Flow m3/d 540 270BOD Load per Capita kg/hd/d 0.06 0.06BOD Load per Dav ka/d 120 60

DISCHARGE STANDARDS

Legislative requirements

Urban Waste Water Treatment Regulations

The Urban Waste Water Treatment Regulations 1994 to 2004 were issued to giveeffect to EU CouncilDirectives Nos 20010/EC. 91/271/EEC and specify that wastewater arising frompopulations of less than 2,000 shall, by the end of 2005, be subject to appropriatetreatment prior to discharge.Wastewater arising from populations of between 2,000and 15,000 required secondary treatment or an equivalent treatment by the end of2005.

The wastewater discharges from Abbeydorney are subject to the requirements ofthe Urban Wastewater Treatment Regulations.

Quality of Salmonid Waters Regulations

The River Shannow is not designated as salmonid under the EuropeanCommunities (Quality of Salmonid Waters) Regulations, 1988. The wastewaterdischarges from Abbeydorney are therefore not subject to the requirements of theQuality of Salmonid Waters Regulations.

Quality of Surface Water Intended for the Abstraction of Drinking WaterRegulations

There are no drinking water abstraction points on the River Shannow in the area ofinterest, consequently the European Communities (Quality of Surface WaterIntended for the Abstraction of Drinking Water) Regulations, 1989 does not apply.

Phosphorus Regulations

The Local Government (Water Pollution) Act, 1977 (Water Quality Standards ForPhosphorus) Regulations, 1998 (SI No. 258 of 1998) oblige local authorities tomaintain or improve the water quality of rivers by 2007 by reference to the Q-Rating(biotic index) or the concentration of molydbate reactive phosphate (MRP). ThePhosphorus Regulations apply to the River Shannow.

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In addition, the River Shannow is not designated under the following pieces oflegislation: -

• Quality of Shellfish Waters Regulations, 1994. (5.1. 200 Of 1994).• Quality of Bathing Waters Regulations, 1992 and Quality of Bathing Waters

(Amendment) Regulations, 1996 (5.1.155 Of 1992 And 5.1. 230 Of 1996).

Applicable Environmental Quality Standards

It is considered important that the highest possible standards, should apply to theRiver Shannow downstream of the discharge given that the ShlRBD water bodyreports assign the River Shannow as being 'at significant risk'.The water quality standards have, therefore, been set for the wastewater dischargeat Abbeydorney based on the Phosphorus Regulations, 1998 and the Quality ofSalmonid Waters Regulations, 1988, which designate the highest legislativeenvironmental quality standards applicable in Ireland.

DISCHARGE OPTIONS

Treated effluent is currently being discharged to the Abbeydorney stream at theexisting wastewater treatment plant which is located to the north east of the village.In determining the most suitable watercourse as the point of discharge from theproposed facility a number of locations were examined.These are listed below and identified in Figure 7.

• .Milltown House Stream• Abbeydorney Stream• Shannow River

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Water Policy Regulations - Water Framework Directive

The European Communities (Water Policy) Regulations 2003 (S.1. No. 722 of2003), giving effect to the EU Water Framework Directive 2000/60/EC, requirepublic authorities to establish an integrated monitoring and management system forall waters, to develop a dynamic programme of management measures and toproduce a River Basin Management Plan. This requirement is being implementedthrough the establishment of river basin management projects for River BasinDistricts, of which there are eight in Ireland. The River Shannow is included withinthe Shannon International River Basin District (ShIRBD). The Management Systemfor ShlRBD is currently under development and no standards have yet beenprescribed. Water Body Reports have been produced for the river systemswithin the district and the River Shannow has been shown to be 'at significant risk'particularly in relation to its biotic index.

Nitrates Directive

The European Communities (Protection of Waters Against Pollution fromAgricultural Sources) Regulations, 2003 (S.1. No. 213 of 2003) gives effect toCouncil Directive 911676/EEC (Nitrates Directive) under Articles 3(5) and 5 anddesignates "The national territory of Ireland" as the area to which an actionprogramme under the Nitrates Directive will be applied.

A National Nitrates Action Programme for Ireland was developed in 2005 forimplementation on a phased basis commencing on 1 January 2006. The primaryaims of the action programme are to reduce water pollution/eutrophication causedor induced by nitrates and phosphates from agricultural sources and to preventfurther such pollution/eutrophication.

For the purposes of this programme the national territory has been sub-divided intothree zones (groups of counties) by reference mainly to soil type, rainfall and lengthof growing season. These zones are tabulated in Annex 2. The zones are asfollows-

• Zone A comprises the counties of Carlow, Cork, Dublin, Kildare, Kilkenny,Laois, Offaly,Tipperary, Waterford, Wexford and Wicklow.

• Zone B comprises the counties of Clare, Galway, Kerry, Limerick, Longford,Louth, Mayo,Meath, Roscommon, Sligo and Westmeath.

• Zone C comprises the counties of Cavan, Donegal, Leitrim, and Monaghan.

The Nitrates Directive defines surface waters and particularly those used for theabstraction of drinking water, which are polluted or are liable to pollution as thosecontaining or which could contain nitrate concentrations greater than 50mg/l.

The Nitrates Directive has been further implemented through The EuropeanCommunities (Good Agricultural Practice for Protection of Waters) Regulations2005 and 2006, which came into effect on 1st February, 2006 and 1st August 2006respectively. These Regulations give statutory effect to certain elements of theaction programme and set out the measures to prevent pollution of watercoursesfrom phosphorus and nitrogen related agricultural sources.

Other Regulations

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The Abbeydorney Stream discharge into the Miltown Stream which in turndischarges to the Shannow River approximately 2.5km downstream of ShannowBridge.

There is no flow data available for either of the streams but it is clear from visualinspection that average daily flows are considerably less than those on the nearbyShannow River.

The limited physico-chemical data available for the Miltown Stream shows recordedvalues of BOD varying between a minimum of 1.0 mgll and a maximum of 16.1 mg/lwith a median value of 1.8 mgll (ref. Table 8)The maximum BOD value recorded islikely to give rise to a high 95%ile value. For example, if all of the remainingsamples were at the minimum value of 1mg/l a 95%ile value of 7.75mg/l wouldresult. This is significantly higher than the requirements of the Salmonid WaterRegulations of 5mg/l.

The stream is showing a current Biotic Index of Q4, thus, requiring themaintenance of a median MRP at 0.03mgP/I. The stream, from the data in Table 8and as provided by EPA, has an MRP of 0.06mgP/I, which indicates that thestream has no capacity to assimilate phosphorus.

Table 8 : Physico-Chemical Data on Miltown Stream

Parameter Parameter Minimum Median Maximum No ofUnits Samples

B.O.O mall 1.0 1.8 16.1 12Ortho- mg PII 0.02 0.06 0.14 20PhosohateOxidised mg NIl 0.7 1.9 3.8 19NitroaenTotal mg NIl <0.02 0.05 1.11 11Ammonia

There is no physico-chemical data available for the Abbeydorney Stream, althoughbased on our assessment of the Miltown Stream, which has similar characteristics,it is unlikely that the Abbeydorney Stream would have capacity to assimilate flowsfrom the wastewater treatment plant.

The physico-chemical data provided by the EPA for the Shannow River is shown inTable 9 .It indicates that the water quality of the river is better than that of theMiltown Stream.

Table 9 Phvsico-chemical Data on Shannow RiverParameter Parameter Minimum Median Maximum Noof

Units_ Samples

8.0.0 mg/l 1.0 1.8 3.1 13

Ortho- mg P/I 0.015 0.041 0.083 23PhosohateOxidised mg NIl 1.55 3.72 14.3 22NitroaenTotal mg NIl 0.02 0.05 0.28 15Ammonia

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Consequently the Shannow River is considered the most appropriate dischargelocation for treated wastewater from Abbeydorney.

WASTEWATER TREATMENT PLANT

Extended aeration is typically chosen for small to medium populations and hasbeen selected for Abbeydorney.

The following sections present preliminary design details for the new wastewatertreatment plant. All figures and dimensions are, at this stage, indicative, and willneed to be confirmed at detailed design stage.

The wastewater treatment facility proposed for Abbeydorney will consist of thefollowing: -

• Preliminary treatment incorporating:-- 6mm duty/standby screens with a 10mm by-pass screen.- Grit removal equipment to remove solids with a specific gravity>2.65g/cm3 down to0.2mm incorporating classification and washing to achieve <10% organics

content.- Grease removal system.

• Storm water storage for 2 hours at 3DWF and including 6mm overflowscreening.

• Secondary Treatment through the use of extended aeration with fullnitrification and secondary clarification.

• A tertiary treatment stage in the form of a sand filter and will include feedpumps, compressorsand all interconnecting pipework.

• Phosphorus removal by chemical precipitation.• Raw sludge storage with 5 days capacity.• Odour control equipment to be provided on preliminary treatment and

sludge storage facilities.• Buildings to house preliminary treatment system, aeration equipment,

monitoring and controlequipment and general working areas.

• Influent, effluent and 'in process' flow and load monitoring and recording.

It is proposed that the plant should be divided to allow for at least two streams inthe secondary treatment stage. This arrangement will facilitate maintenance in theevent of breakdown of an element of any stream. The treatment plant should bearranged in a modular format so that increases in capacity can be incorporatedwithout too much disruption to the existing facility. Full details of the proposeddesign for the new wastewater treatment plant at Abbeydorney are provided inTable 10.

It is proposed that surplus sludge produced from the secondary treatment plantwould be drawn off each of the clarifiers as required and discharged to a picketfence thickener and then to a thickened sludge storage tank with five dayscapacity. Sludge produced at Abbeydorney will be removed from site and treated inaccordance with Kerry County Council's Sludge Management Plan

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Table 10: Wastewater Treatment Plant Design

Item Unit Phase 1 &2

3,000 p.e.STORM WATER STORAGE

Volume of storm tank at m3 1352hrs of3DWFNo. of Tanks nr 2Depth of Tank m 2.5Width assumed m 4.0Length m 6.75

Item Unit Phase 1 Phase 22,000 p.e. 1,000 p.e.

SECONDARY TREATMENT - AERATIONCAPACITY

Aeration Volume m3 857.14 428.57Number of Steams nr 2 1Tank depth selected m 5 5Number of Aeration nr 3 3cells per streamWidth of each m 5.35 5.35aeration cellassumedLength of each m 5.35 5.35aeration cell

CLARIFIERS

Sidewall Deoth m 2.5 2.5No of clarifiers nr 2 1Diameter m 7.6 7.6

TERTIARY SAND FILTERSNo. of filters nr 2 1Diameter m 3.4 5.4Height m 4.0 4.0

Item Unit Phase 1 & 23,000 p.e.

Sludge ThickenerPre-thickened SludQe Volume m3/d 53.35Thickened sludge %ds 3%concentrationThickened sludQe volume m3/d 8.89Thickener diameter m 3.23

Sludge Storage TankStorage Volume Required m3 44.46StoraQe period required Days 5Tank liquid depth m 3

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I""",L7e",n~g-"-th,-,(",S.::lgu",a::.:r-",e-"ta,,,n-,,-k,,-) ----If--'mm"'-------------I--'3o.::.8:::5"-------Width . .3.85

Legislative requirementsUrban Waste Water Treatment Regulations

The Urban Waste Water Treatment Regulations 1994 to 2004 were issued to giveeffect to EU Council Directives Nos 200/60/EC. 91/271/EEC and specify thatwastewater arising from populations of less than 2,000 shall, by the end of 2005.be subject to appropriate treatment prior to discharge. Wastewater arising frompopulations of between 2.000 and 15,000 required secondary treatment or anequivalent treatment by the end of 2005.The wastewater discharges from Abbeydorney are subject to the requirements ofthe Urban Wastewater Treatment Regulations.

Quality of Salmonid Waters Regulations

The River Shannow is not designated as salmonid under the EuropeanCommunities (Quality of Salmonid Waters) Regulations, 1988. The wastewaterdischarges from Abbeydorney are therefore not subject to the requirements of theQuality of Salmonid Waters Regulations.

Quality of Surface Water Intended for the Abstraction of Drinking WaterRegulations

There are no drinking water abstraction points on the River Shannow in the area ofinterest. consequently the European Communities (Quality of Surface WaterIntended for the Abstraction of prinking Water) Regulations, 1989 does not apply.

Phosphorus Regulations

The Local Government (Water Pollution) Act, 1977 (Water Quality Standards ForPhosphorus) Regulations, 1998 (SI No. 258 of 1998) oblige local authorities tomaintain or improve the water quality of rivers by 2007 by reference to the Q-Rating(biotic index) or the concentration of molydbate reactive phosphate (MRP). ThePhosphorus Regulations apply to the River Shannow.

Water Policy Regulations - Water Framework Directive

The European Communities (Water Policy) Regulations 2003 (S.1. No. 722 of2003), giving effect to the EU Water Framework Directive 2000/60/EC, requirepublic authorities to establish an integrated monitoring and management system forall waters, to develop a dynamic programme of management measures and toproduce a River Basin Management Plan. This requirement is being implementedthrough the establishment of river basin management projects for River BasinDistricts, of which there are eight in Ireland. The River Shannow is included withinthe Shannon International River Basin District (ShIRBD). The Management Systemfor ShlRBD is currently under development and no standards have yet beenprescribed. Water Body Reports have been produced for the river systemswithin the district and the River Shannow has been shown to be 'at significant risk'particularly in relation to its biotic index.

Nitrates Directive

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WWD AppIieation Form V<¥37'i>? 6/08Kerry County Council - Abbeydorney Agglomeration.

The European Communities (Protection of Waters Against Pollution fromAgricultural Sources) Regulations, 2003 (S.1. No. 213 of 2003) gives effect toCouncil Directive 91/676/EEC (Nitrates Directive) under Articles 3(5) and 5 anddesignates "The national territory of Irel-and" as the area to which an actionprogramme under the Nitrates Directive will be applied.

A National Nitrates Action Programme for Ireland was developed in 2005 forimplementation on a phased basis commencing on 1 January 2006. The primaryaims of the action programme are to reduce water pollution/eutrophication causedor induced by nitrates and phosphates from agricultural sources and to preventfurther such pollution/eutrophication.

For the purposes of this programme the national territory has been sub-divided intothree zones (groups of counties) by reference mainly to soil type, rainfall and lengthof growing season. These zones are tabulated in Annex 2. The zones are asfollows-

• Zone A comprises the counties of Carlow, Cork, Dublin, Kildare, Kilkenny,Laois, Offaly, Tipperary, Waterford, Wexford and Wicklow.

• Zone B comprises the counties of Clare, Galway, Kerry, Limerick, Longford,Louth, Mayo, Meath, Roscommon, Sligo and Westmeath.

• Zone C comprises the counties of Cavan, Donegal, Leitrim, and Monaghan

The Nitrates Directive defines surface waters and particularly those used for theabstraction of drinking water, which are polluted or are liable to pollution as thosecontaining or which could contain nitrate concentrations greater than 50mg/1.

The Nitrates Directive has been further implemented through The EuropeanCommunities (Good Agricultural Practice for Protection of Waters) Regulations2005 and 2006, which came into effect on 1st February, 2006 and 1st August 2006respectively. These Regulations give statutory effect to certain elements of theaction programme and set out the measures to prevent pollution of watercoursesfrom phosphorus and nitrogen related agricultural sources.

Other Regulations

In addition, the River Shannow is not designated under the following pieces oflegislation: -

• Quality of Shellfish Waters Regulations, 1994. (S.1. 200 Of 1994).• Quality of Bathing Waters Regulations, 1992 and Quality of Bathing Waters

(Amendment)Regulations, 1996 (S.1. 155 Of 1992 And S.1. 230 Of 1996).

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Wastewater & Sludge ProjectMid-Kerry

Abbeydorney Sewerage SchemePreliminary Report

DOCUMENT CONTROL SHEET

Client Kerry County Council

Project TItle WastewalOf & Sludge Project Mid-Kerry

Docunent Title Abbeydomey Sewerage Scheme Preliminary Report

Docunent No. RPS-CElMCW0380RPOO01A02

This DocumentDeS TOC Text List of Tables Ust of Figures No. of Appendices

Comprises1 1 36 0 0 7

Rev. Status Author(s) Reviewed By Approved By Otnce of Origin Issue Date

AOIIssue for

RMcC, RK, DL DL KP Cork March 2007Approval

A02Issue for

RMcC, RK, DL Cork July 2007Approval

Consulting Engineers

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Wastewater and Sludge Project· Mid KerryAbbeydomey Sewerage Scheme

TABLE OF CONTENTS

Preliminary Report

1 EXECUTIVE SUMMARY 1

1.1 Introduction .. 11.2 Existing Scheme Deficiencies . .. .. 21.3 Future Population Projections .. 21.4 Development Boundary .. 31.5 Network Improvements... .. 31.6 Treatment WorKs... .. 41.7 Summary Of Scheme Proposals .. 51.8 Recommendations And Costs 5

2 PLANNING AND INFRASTRUCTURE ISSUES 6

2.1 Terms Of Reference .. 62.2 Planning Constraints .. 72.3 County Development Plan .. .. 72.4 Archaeological Features....... .. 7

3 EXISTING SYSTEM 9

3.1 Introduction .. 93.2 Physical Deficiencies In Infrastructure 103.3 Capacity Of Main Sewers .. 113.4 Flow Measurements And Sampling Results .. 113.5 Assessment Of Contributing Population............. .. .. 123.6 Private Wastewater Treatment 133.7 Existing Water Supply Infrastructure 13

4 FUTURE POULATION AND DRAINAGE AREAS 14

4.1 Design Population .. 144.2 Calculation Of Development Area 16

5. PROPOSED NETWORK 19

5.1 Introduction.... .. .. 195.2 Proposed Foul NetworK 195.3 Proposed Storm Network 20

6 PROPOSED TREATMENT WORKS 23

6.1 Introduction 236.2 Wastewater Treatment Load 236.3 Discharge Standards . 236.4 Discharge Options .. 256.5 Discharge Specification .. 316.6 Treatment Plant Site Options.. .. 316.7 Wastewater Treatment Plant.... .. 32

7 RECOMMEN DATIONS & COSTS 34

7.1 Network Improvements........................................... . 347.2 Treatment WorKs .. 347.3 Procurement Strategy.............. .. 347.4 Implementation Programme.... . .. 357.5 Costs............................. .. 36

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Wastewater and Sludge Project - Mid KerryAbbeydomey Sewerage Scheme

DRAWINGS

1. Layout Plan of Existing FouVCombined Sewers in Abbeydorney

2. Proposed Foul Sewer Layout

3. Proposed Storm Sewer Layout

Preliminary Report

4. Layout Plan of Existing Foul Collection System and Results of CCTV Survey 2006

5. Longitudinal Sections of Proposed Foul Sewers - Sheet 1 of 2

6. Longitudinal Sections of Proposed Foul Sewers - Sheet 2 of 2

7. Longitudinal Sections of Proposed Storm Sewers - Sheet 1 of 1

8. Water Supply Scheme Details

9. Wastewater Treatment Plant Layout

APPENDICES

APPENDIX 1APPENDIX 2APPENDIX 3APPENDIX 4APPENDIX 5

DESIGN ASSESSMENT OF EXISTING SCHEMEDESIGN OF PROPOSED COLLECTION NETWORKASSIMILATIVE CAPACITY OF RIVER SHANNOWCOST ESTIMATESFLOW & LOAD SURVEY REPORT

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REFERENCESLocal Documents:• Phosphorus Measures Report (Kerry County Council)• Kerry County Sludge Management Plan• Kerry County Development Plan• Me~heal Ciarrai• Kerry County Housing Strategies

Preliminary Report

National & EC Documents:• Urban Wastewater Treatment Directive (911271/EEC)• Urban Wastewater Treatment Regulations• Dangerous Substances Directive (76/896/EEC)• Freshwater Fish Directive (781283/EEC)• Bathing Waters Directive (76/160/EEC) Regs SI84 of 1988. SI155 of 1992 & SI145 of 1994• Disposal of Waste Oils Directive (87/01/EEC)• Groundwater Pollution Directive (80/68/EEC)• Sewage Sludge used in Agriculture Directive (86/278/EEC)• Use of sewage sludge in Agriculture Regs (SI Nos.148 and 267)• Water FrameworK Directive (2000/60/EEC)• EU Shellfish Directives 91/4921EEC. 19/4931EEC• National Spatial Strategy• National Siudge Strategy• Local Government Water Pollution Act. 1977• Environmental Protection Act. 1992• Waste Management Act 1996• Health & Safety Act• Water Quality Standards for Phosphorous RegUlations (SI 258 of 1998).• Quality of Salmonid Waters Regulations - SI293 of 1998• DEHLG Circular L16/02 (WSP) Water Services Pricing Policy• DEHLG Circular L10/01 Procurement using PPP and DEHLG Policy FrameworK for PPP• DEHLG Circulars (L4/00. L16/00. L6/02. L7/02. L10/02 & L16/02) (WSP)• DEHLG "Procedures and Criteria in Relation to Storm Water Overflows".• BS 6297:1983 - Small Sewage Treatment Works• Water Research Centre - Sewerage Rehabil~ationManual.• Guidance Documents for the Procurement of Small Water Services Schemes - Part B Small

Wastewater Projects• Planning & Development Act 200 and Planning & Development RegUlations 2001• DEHLG Circular L6/94 Re. Sludge Treatment.• DEHLG Circular L1/74• Water Services National Training Group ~ Performance Management Systems• National Monument Act (1994)• DEHLG Circular L3/99• EPA Act (1992) UWWT RegUlations (SI 254 of 2001).• EPA Hydrological Data Report 1997• Water Quality in Ireland (EPA)• Waste Management Act (1996)• EPA Wastewater Treatment Manuals (1999). Treatment Systems for Small Commun~ies,

Business. Leisure Centres and Hotels

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Wastewater and Sludge Protect· Mid KerryAbbeydomey Sewerage Scheme

1 EXECUTIVE SUMMARY

1.1 INTRODUCTION

Preliminary Report

Kerry County Council has commissioned RPS Consulting Engineers to prepare a Preliminary Reportdetailing the necessary improvements required to Abbeydomey Sewerage Scheme to cater fordemand in the design horizon 2006- 2026.

Abbeydomey is a small village located approximately 7km north of Tralee. The village has developedlinearly from the crossroads of the R557 and the R556. The R556 is the main TraleelBallybunnionroad, which leads south to Traloo.

The pUblic sewerage scheme in Abbeydomey was constructed in the 1950's and serves both domesticand commercial discharges.

The existing network has a number of deficiencies and is inadequate to meet the projected future loadfrom Abbeydorney.

The village. which has currenUy 138 residences. is undergoing substantial change brought about bypresent and proposed development.

A significant number of developments which have received planning approval have not to date beenconstructed and consequently it is likely that a further increase in demand will take place immediatelyfollowing the implementation of the proposed scheme.

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Wastewater and Sludge Project. Mid KerryAbbeydomey Sewerage Scheme

Preliminary Report

This Preliminary Report assesses the current scheme deficiencies, future population projections,anticipated development boundaries, sewer network and treatment works making recommendations tomeet the growing demands of the area.

1.2 EXISTING SCHEME DEFICIENCIES

The existing foul collection network functions as a combined system and although its capacity isadequate to cater for existing demand a significant proportion of the existing network (74%) consists ofpipes that are less than 225 mm in diameter. In addition, the CCTV survey completed as part of thisreport has identified numerous defects in the existing foul network that will need attention either bymeans of repair or replacement.

There is no separate storm water run-off system in Abbeydomey.

The collection system delivers sewage to the Imhoff Tank located at Montanagay to the north east ofthe village and discharges treated effluent to a small tributary of the Shannow River. Quality data forfinal effluent discharge is not available and consequently no conclusion could be reached to determinecompliance with the Urban Waste Water Treatment Regulations 2001.

There is currently limited access to the treatment plant slle, as the area surrounding the plant isundergoing residential development.

1.3 FUTURE POPULATION PROJECTIONS

--NSS~tiOil. --KOCFrajectior-.

SOO

Kerry County Council expressed concern that, basedon their experience of similar villages in the county,this may substantially underestimate future demandand consequently further significant growth isallowed for in our assumed population estimate(2026) for the proposed scheme of~.

The 2006 popUlation served by the scheme isestimated to be 408 based on current geo-directory 3000information.

Using published popUlation projections and allowing 2000an initial increase to cater for significantdevelopments within the village which are currently lSOObeing completed and/or have received planning, wearrive at an estimated (2026) popUlation for the 1000scheme of 1.395.

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1.4 DEVELOPMENT BOUNDARY

Preliminary Report

The recently published draft local area plan (LAP) for Abbeydomey identified a development boundaryand an associated area within that boundary of 62.91 Ha.

Based on the assumed population of 2.421 and allowing for the zoned amenijy area identified in theLAP (9.338 Ha.) we estimate the required development area for the proposed scheme as 165.15 Ha.

1.5 NETWORK IMPROVEMENTS

The proposed scheme for Abbeydomey village will provide separate foul and storm networks whichwill adequately cater for the future demand from the village in the design horizon 2006-2026.Thenetwork which is identified below will be completed in two phases. Phase 1 will cater for the existingpopulation and Phase 2 is intended to facilitate possible future development.

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Was1ewater and Sludge Project - Mid KerryAbbeydomey Sewerage Scheme

1J'-.-r, T

1.6 TREATMENT WORKS

Preliminary Report

It is proposed to construct a new wastewater treatment plant to the north-east of the village. The plantwill be constructed in two phases. Phase 1 is designed to cater for a population equivalent of 2,000and Phase 2 is to cater for a further 1,000 PE thereby ultimately providing capacity to cater for apopulalion equivalent of 3,000. An extended Aeration Plant is the recommended method of treatmentas it proVides the most cost effeclive solution for producing an effluent quality which will meet therequired regulatory standards.

The treated effluent will be discharged from the WWTP site to the preferred location of discharge alongthe Shannow River.

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Wastewater and Sludge Project - Mid KerryAbbeydorney Sewerage Scheme

1.7 SUMMARY OF SCHEME PROPOSALS

Preliminary Report

The works that are recommended in this report are listed in Table 1.1 below with associated estimatedcosts also identified.

Table 1.1 : Summary of Estimated Costs

DI lpIIoa ConlnlCtCOllt(I)

"'-1 1'1-.2Network ImprovementsFoul Collection System lO844,280 -Stonm Collection System lO498,600 -Sub-Total €1,342,880 -Treatment Works €l,SOO,OOO €7S0,000

Sub-Total €2,842,880 €750,000

Preliminaries (lS%) lO426,432 El12,500

Sub-Total €3,269,312 €862,500

[email protected]% lO441,357 lOl16,438

Estimated Contract Cost €3,710,669 €978,938

Overheads (1S%) (admin, conSUltancy fees, studies, etc). lO556,600 E146,841

Land Purchase and Way leaves E1S0,000 -Third Party Contracts - Site Investigation €ZOO,OOO -Estimated All-in Capital Cost €4,617,269 €1,125,778

Operational Costs of Treatment Works (PV) (lO90,000 per annum year E698,956 E639,9641 - 10, lO135,000 (present day) per annum year 10 - 20)

Estimated Whole Life Cost of Project €5,316,226 €1,765,742

1.8 RECOMMENDATIONS AND COSTS

Phase 1: In order to meet the demand from areas of the village which are currently developed werecommend that Kerry County Council proceed immediately wllh the implementation of Phase 1 worksat an estimated all in cost of € 4.617,269 (2007). This will provide separate collection systems to caterfor demand in areas that are currently developed and capacity in the network to cater for the projected2026 population. In addition Phase 1 will include a new treatment plant to cater for a populationequivalent of 2,000.

Phase 2: It is anticipated that storm and foul sewers in areas within the development boundary whichare reserved for future development will be completed in conjunction with the development of theselands. It is expected that prospective developers will be required to provide the collection systemsystems or to pay a contribution to Kerry Co Council for their construction. Consequently theassociated costs are not included in the estimated costs for the scheme. However in order to cater forthe projected 2026 population it will be necessary to upgrade the treatment facility to cater for thedesign demand of 3,000 PE. This upgrade is included as Phase 2 of the scheme with associatedcapital costs estimated to be € 1.125,778 (2007).

The present day value of operating and maintenance costs for the scheme over the twenty-yeardesign horizon is estimated to be €1,338,920 resulting in a whole life cost for the project of€7,081,968.

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Wastewater and Sludge Projecl- Mid KerryAbbeydomey Sewerage Scheme

2 PLANNING AND INFRASTRUCTURE ISSUES

2.1 TERMS OF REFERENCE

Preliminary Report

Kerry County Council appointed RPS Consulting Engineers (RPS CE) to prepare a Preliminary Reportoutlining the present condition of and proposed improvements to the Abbeydomey Sewerage Schemeto cater for existing and future development in the design horizon 2006-2026.AII recommended worksare to be designed to achieve the appropriate treatment and effluent discharge standards inaccordance with national legisiation and the requirements of local discharge and water qualityprotection conditions.

The specific requirements contained within the brief include: -

• Completion of a technical survey and assessment of the existing foul and surface waternetworks, pumping stations and treatment plants.

• Identification of deficiencies in the existing systems, both structurally and hydraulically, includingsurveys and data collection as follows: -

Ground conditions and potential archaeological impact.Current !lows and expected loadings on plant.Sources of infiltration.Condition of existing systems.Quality and !low regime of receiving waters.CCTV survey with digital output.

• Preparation of Development Boundary Maps in agreement and in conjunction with the ForwardPlanning Department of Kerry County Council.

• Identification of existing and future loadings inclUding seasonal fluctuation and phasing asnecessary.

• Proposed remedial works required to existing networks and systems.

• Recommendations for new separate wastewater and surface water networks, overflow systems,pumping stations and treatment plant for existing and future loadings for the proposeddevelopment catchment where: .

A phased approach is identified for a 50-year design life for plant and materials.All foul sewage is conveyed to the treatment works.Pumping is minimised.Surface water systems are designed for no flooding up to 20-year return periodstorms.Foul sewers are designed for six (6) DWF.

• Producing detailed cost estimates (capital, operational & maintenance), energy impacts, optionsand phasing proposals.

• Presenting preliminary layout and design drawings of proposals.

• Completing a technical assessment of the ability of the receiving waters to cater for existing andfuture discharges.

• Producing a Water Charging Policy Report.

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Wastewater and Sludge Project· Mid KerryAbbeydorney Sewerage Scheme

2.2 PLANNING CONSTRAINTS

Preliminary Report

The village. which has currently 136 residences. is undergoing substantial change brought about bypresent and proposed development. This is seen clearly by referring to Table 2.1 which identifiesplanning applications received by Kerry County Council for houses/commercial developments over thefive (5) year period 2002-2007.

Table 2.1: Planning Applications in Abbeydomey 2002-2007.

YEAR HOUSES ICOMIlERCIAI.2002 3 -2003 4 22004 51 22005 204 42006 29 -

2007 (March) 84 2

Total 378 10

A significant number of developments which have received planning approval have not to date beenconstructed and consequently it is likely that a further increase in demand will take place immediatelyfollowing the implementation of the proposed scheme.

2.3 COUNTY DEVELOPMENT PLAN

Abbeydorney is dassified as a village under the settlement hierarchy laid out in the County KerryDevelopment Plan (2003), and lies within the Traloo Elecioral Area. One of the key objectives of thedevelopment plan is to promote the strengthening of existing rural villages as a focus for thedevelopment of rural areas, and to prepare plans for the village identifying strategic objectives for theoverall development within defined development limrts.

The draft local area development plan for Abbeydorney was pUblished in July 2006 and covers theperiod 2006-2011. It identifies an overall development area of 62.91 ha the boundary for which isshown on Figure 2.1. A significant portion of the area within the development boundary (approximately15%) is reserved as an amenity/recreational area and consequently will not be available for futuredevelopment.

2.4 ARCHAEOLOGICAL FEATURES

Kerry County Council will carry out a detailed archaeological assessment of Abbeydorney at detaileddesign stage.

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Mop

Land Use ZOning

Dec. 2006:::.~c.:: ~.

c::=J ~~ 10"*'\11Cl __~~...)~_~_lrl',"1

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-_.......... -....-

Preliminary Report

·_............ Uo.ll..........."" ._UH_"",,~__.tl-.'I

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RPSIMCW0380RP0001A02

Figure 2.1 : Draft Abbeydomey Development Plan Map

8 Rev. A02

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Wastewater and Sludge Project - Mid KerryAbbeydorney Sewerage Scheme

3 EXISTING SYSTEM

3.1 INTRODUCTION

Preliminary Report

The area currently serviced by the existing system has a gentle gradient (ranging from 0.5% • 2%),generally falling from north to south .The village is traversed by a stream, locally referred to as theAbbeydorney Stream, which provides a point of discharge for both storm and treated effluentdischarges.

The existing sewerage network dates from the late 1950's. It functions as a combined system takingrunoff from the roads and from the back of houses. The existing system consists of approx. 1,515 lin.metres of concrete sewers ranging in size from 150mm to 225 mm. There is currently no separatestormwater network in the village.

The collection system carries sewage to the Imhoff Tank and Sludge drying beds located atMontanagay to the north east of the village. Treated effluent is discharged to the Abbeydorney Stream,which is a tributary of the Shannow River.

Figure 3.1 below shows the extent of the existing collection system with detailed layouts indicated onDrawing 01.

Figure 3.1 : Layout of Existing Network

\A!

\-'

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Wastewater and Sludge Project. Mid KerryAbbeydorney Sewerage Scheme

3.2 PHYSICAL DEFICIENCIES IN INFRASTRUCTURE

Preliminary Report

Based on a visual examination, the following physical deficiencies in the eXisting wastewaterinfrastructure were noted.

3.2.1 Existing Collection System

The existing foul collection system is shown on Drawing No.1. Pipe sizes range from 150mm diameterto 225mm diameter. It is a partially combined system with runoff from the roads and the back of theroofs of houses discharging to the foul system. The system caters for existing development along theapproaches to the crossroads in the centre of the Village.

A CCTV survey of the existing sewers in the network was completed in March 2006. The investigationwas confined to sewers of 225 mm diameter and greater. The full results of the survey are shown onDrawing 04 with a summary of the more severe defects listed in the following Table 3.1.

Table 3.1: Summary of Defects in Existing Foul Sewer

Sewer Run ~:"Diameter

Defects/mmlCircumferential Crack;

Mh13-Mh 10 58 225mm 6 No. Protruding connections;Blocked branchCracked Pipe;

Mh 10-Mh19 92 225mm Branch closed;Solidified Deposits;2 No. Defective connections3 No. Branches compietely blocked;

Mh 19 - Mh 20 93 225mm 1 No. Longitudinal cracks;1 No. Defective connection

Mh 20 - Mh 21 30 225mm Blocked with Rubble;Cleanina Reauired;Blocked with Sediment;

Mh 21 - Mh 22 76 225mm High water level;Cleanina Reauired

Total 349m

In addition, the bulk of the network (1,127 lin.m of the total 1,515 lin.m) is made up of 150 mmdiameter pipes. Trunk sewers of less than 225 mm diameter are not recommended as they lead toongoing maintenance issues.

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3.2.2 Existing Wastewater Treatment

Preliminary Report

The existing wastewater treatment plant site is located northeast of the village centre. The plant wasconstructed in the 1950's and consists of an Imhoff tank and sludge drying beds. Treated effluent fromthe works outfalls to the Abbeydomey Stream.

The existing s~e measures approximately 40m x 45m (1800 m') and consequently is too small toaccommodate a new treatment wor1<:s.

There is a residential development currently under construction in the area surrounding the WWTP,and as a result, access to the s~e is limited at present.

aual~y data for final effluent discharge is not available and consequently no conclusion can bereached to determine compliance with the Urban Waste Water Treatment Regulations 2001.

3,3 CAPACITY OF MAIN SEWERS

3,3,1 Foul Sewer Network

The adequacy of the existing foul sewer was assessed using MicroDrainage WinDap® softwarepackage. Details of the analysis are provided in Appendix 1. The capacity of the existing foul sewerwas found to be adequate for existing fiows.

The Client has specified a minimum pipe size of 225 mm diameter for foul sewers. Consequently,although all foul sewers were determined to have sufficient capacity for existing development, those ofless than 225 mm in diameter are, fO( operational reasons, deemed unsuitable and their replacementor upgrade will be included as part of the recommended works detailed in Section 5 of this report.

3,3.2 Storm Sewer Network

There is currently no stormwater collection system in Abbeydomey. Surface water runoff from roads,and backs of houses is currently sent to the foul sewer.

3.4 FLOW MEASUREMENTS AND SAMPLING RESULTS

A Flow and Load Survey was completed in Abbeydorney in the period March 21 ~ to April 4th 2006.Flow measurements and fiow proportional composite samples were taken just upstream of the existingtreatment works.

The fiow proportional composite samples were taken over three 24-hour periods starting at midnightover the following dates of the survey; March 24"', March 28'" , and March 30"', 2006.

Full results of the sampling and analysis, are given in Appendix 5. The results listed in Table 3.2 belowrelate to dry weather conditions on March 24'" 2006.

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Preliminary Report

Table 3.2: Summary of Results From Flow and Load Survey- March 24th 2006

Pal'lllllelers ~Ite~,

Daily Flow (m'/day) 74.585 IMeasured BOD' (kg/day) 3282 IEquivalent Population @ 6Og/h/d 55 IDWF/h/d 1,363.5 IAverage Flow Rate (lis) 5166 iMaximum Flow Rate (l/s) 10.965 =(2.12 Av)

Night Flow Rate (lis) 0.493 =(0.09 Av.)

The BOD loads Indicate a contributing population of 55 which is sUbstantially less than what would beexpected. In addition the equivalent per capita flow, 1,363.5 I/h/d, would suggest that the BOD loadsrecorded might not be dependable. Based on night flows there appears to be minimal (if any)infiltration into the network system. Based on a per capita contribution of 180 lIh1d, the daily flow of74.585 m'/day indicates a contributing population of 416 persons.

3.5 ASSESSMENT OF CONTRIBUTING POPULATION

Table 3.3 assesses the likely contributing population equivalent based on An Post Geo Directory datedJuly 2006.

Table 3.3: Existing Wastewater Loads Estimated From Geo-Directory

0tIaIl8(IfPremisa Number ~Residential Buildinos 136 408School 187 nunil + 7 Staff 1m 40 lIh1d) 1 17Church 1 1Pub 2 6Shoo/Butcher 1 4Shan/Post Office 1 2Shan 1 2Maxol Petrol Station 1 10Abbev Grill Restaurant 1 5Communrtv Centre 1 5GAA Club 1 5Garda Station 1 7Abbev Antioues 1 1TOTAL POPULATION EQUIVALENT 148 473

Commercial premises listed above were allocated an assumed PE based on recommendations fromTable 3 of the "EPA Wastewater Treatment Manua/ for Small Communities, Business. Leisure Centresand Hotels" and from Table 2.2 of Ciria PR72.

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Wastewater and Sludge Profect - Mid KerryAbbeydomey Sewerage Scheme

Preliminary Report

The Dry Weather Flow (DWF) is estimated to be 108.79m3/d based on a per capita allowance of230Vd. However, the per caprta contribution is considered excessive where infiltration is minimal orabsent. In such a srtuation the "EPA Wastewafer Treatment Manual for Small Communffies, Business,Leisure Centres and Hotels' recommends a per capita contribution of 180Vday. The above DWFbased on a fi9ure of 473 x 0.18 9ives 85.14m2/day.

This compares wrth a flow of 74.585 m3/d recorded on March 24"' 2006 and suggests little or noinfiltration into the existing collection system.

The current estimated population of 408 is based on An Post Geo Directory and does not take accountof developments presently being constructed and/or those at the planning stage.

Nonetheless this figure of 408 is used in the following section of the report as the baseline for thepurposes of predicting future demand and determining the required development area wrth allowancesbeing made in our assessment to cater for the extent of proposed developments in the village.

3.6 PRIVATE WASTEWATER TREATMENT

3,6.1 Package Wastewater Treatment Plants

We are not aware of any private package wastewater treatment plants in Abbeydorney.

3.6.2 Private Septic Tanks

There are no private septic lanks in the Abbeydorney catchment that we are aware of.

3.7 EXISTING WATER SUPPLY INFRASTRUCTURE

The layout of the existing Water Supply Scheme for Abbeydorney is shown on Drawing No 08.

The scheme was constructed in the 1960s and extended in 1975. It supplies approximately 465consumers through 4.1 km of pipework wrth diameters ranging in size from SOmm to 125 mm.

Water is transferred to the scheme from the source at Lough Guitane via the Central RegionalScheme. The most recent data available from Kerry County Council shows a daily demand of 570m3/day, which is substantially more than the design dry weather flow. Clearly the scheme supplies amuch greater area than the village of Abbeydomey,

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