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KILDARE COUNTY COUNCIL COMHAIRLE CHONDAE CHILL DARA WATER SERVICES DEPARTMENT REQUIREMENTS FOR FOUL PUMPING STATIONS AND ASSOCIATED INFRASTRUCTURE DATE: November 2012 REVISION 1

KILDARE COUNTY COUNCIL COMHAIRLE CHONDAE CHILL …kildare.ie/CountyCouncil/WaterServices/WastewaterOperations... · kildare county council comhairle chondae chill dara . water services

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Page 1: KILDARE COUNTY COUNCIL COMHAIRLE CHONDAE CHILL …kildare.ie/CountyCouncil/WaterServices/WastewaterOperations... · kildare county council comhairle chondae chill dara . water services

KILDARE COUNTY COUNCIL COMHAIRLE CHONDAE CHILL DARA

WATER SERVICES DEPARTMENT

REQUIREMENTS FOR FOUL PUMPING STATIONS

AND ASSOCIATED INFRASTRUCTURE

DATE: November 2012 REVISION 1

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TABLE OF CONTENTS

1. SCOPE _____________________________________________________________________ 3

2. FOUL SEWER NETWORK PLANNING _____________________________________________ 3

3. GENERAL DESIGN CRITERIA ____________________________________________________ 4

4. HYDRAULIC DESIGN __________________________________________________________ 4

5. PUMPING STATION COMPOUND _______________________________________________ 6

6. CONTROL BUILDING OR KIOSK _________________________________________________ 8

7. CONTROL BUILDING CONSTRUCTION ____________________________________________ 9

8. PUMP SUMP _______________________________________________________________ 10

9. PUMP / ELECTRICAL SPECIFICATION ____________________________________________ 11

10. ENERGY EFFICIENCY _________________________________________________________ 13

11. RISING MAIN _______________________________________________________________ 13

12. STANDOFF/DISCHARGE MANHOLE _____________________________________________ 15

13. EMERGENCY OVERFLOW CHAMBER ____________________________________________ 15

14. VALVE CHAMBER ___________________________________________________________ 16

15. FLOWMETER AND FLOW METER CHAMBER ______________________________________ 17

16. CHAMBER COVERS __________________________________________________________ 17

17. WELFARE FACILITIES _________________________________________________________ 17

18. CONTROL PANEL ____________________________________________________________ 18

19. TELEMETRY ________________________________________________________________ 19

20. GENERATOR _______________________________________________________________ 19

21. ODOUR ___________________________________________________________________ 19

22. NOISE ____________________________________________________________________ 20

23. DRAWINGS ________________________________________________________________ 20

24. INSPECTIONS DURING THE CONSTRUCTION OF THE FOUL PUMPING STATION _________ 21

25. COMMISSIONING OF THE FOUL PUMPING STATION _______________________________ 21

26. TAKING IN CHARGE OF THE FOUL PUMPING STATION _____________________________ 22

27. CHECKLIST A _______________________________________________________________ 23

PRE-PLANNING STAGE– FOUL PUMPING STATION ________________________________ 23

28. CHECKLIST B _______________________________________________________________ 25

PLANNING STAGE– FOUL PUMPING STATION ___________________________________ 25

29. CHECKLIST C _______________________________________________________________ 27

CONSTRUCTION STAGE – FOUL PUMPING STATION ______________________________ 27

30. CHECKLIST D _______________________________________________________________ 29

PRE-COMMISSIONING STAGE – FOUL PUMPING STATION _________________________ 29

31. CHECKLIST E _______________________________________________________________ 30

POST-COMMISSIONING STAGE – FOUL PUMPING STATION ________________________ 30

32. REFERENCES _______________________________________________________________ 31

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1. SCOPE This document is intended for use by Developers, Consulting Engineers and other interested parties (referred to as Applicants in this document) as a guide to Kildare County Council’s general requirements in relation to the design and construction of all foul pumping stations and associated infrastructure in County Kildare. In some instances, additional measures not outlined in this document may be required as the design of every foul pumping station is unique and has to be assessed on its own merits. In general, the design of a foul pumping station is determined by the size and type of development to be served along with its geographical and topographical position relative to the final point of discharge. As a result, it is recommended that Applicants consult with the Water Services Department of Kildare County Council at the earliest possible stage when planning a development prior to preparing and submitting a planning application. Early consultation will reduce the potential for delays and extra costs arising during the planning process.

2. FOUL SEWER NETWORK PLANNING Kildare County Council’s preferred option at all times is for developments to be fully served by gravity sewerage systems. Pumped systems are not encouraged as they incur long term operating and maintenance costs. They are also potential sources of noxious odours, caused by septicity, and noise. Only in exceptional circumstances will foul pumping stations be approved as an appropriate means of serving a development. However, in such instances it will firstly be necessary for the Applicant to submit an engineering report from a competent and qualified Consulting Engineer to the Water Services Department outlining why it is not possible to service the proposed development with a gravity sewerage system. Following this, the Water Services Department will advise the Applicant if it is prepared to accept a proposal to use a pumped sewerage system. Where a proposal to utilise a pumped sewerage system is accepted, the Water Services Department will assess the proposed location and capacity of the foul pumping station relative to other potential development sites / zoned development land in the immediate vicinity. In some cases it may be necessary for the Applicant to design and construct a foul pumping station with additional capacity to cater for lands outside the immediate development site. In other cases, it may be necessary for a number of Applicants to work in co-operation with each other to design and construct a single foul pumping station which will serve a number of developments which are in close proximity to each other. The purpose of this approach is to ensure that development carried out in areas which cannot be served by a gravity sewerage system is sustainable and that the construction of multiple foul pumping stations in close proximity is avoided. Applicants proposing to connect a development into the public sewerage system utilising existing privately owned drains or pumping mains will be required to submit a letter of consent from the owner confirming that permission has been granted to

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connect to and utilise the private wastewater system. It may also be necessary to provide information confirming that the private wastewater system has surplus capacity to receive additional discharges.

3. GENERAL DESIGN CRITERIA All works shall generally comply with the following publications:

i. Greater Dublin Strategic Drainage Study (GSDS) – Regional Drainage Policies – Volume 2 – New Development - Chapter 5 – Foul Drainage Design published in March 2005 by the Dublin Region Local Authorities as part of the Greater Dublin Strategic Drainage Study.

ii. Regional Code of Practice for Drainage Works - Version 6.0 (and any

subsequent revisions) published in March 2005 by the Dublin Region Local Authorities as part of the Greater Dublin Strategic Drainage Study.

The following useful publications should also be referred to for information and guidance purposes:

i. Sewers for Adoption – A Design and Construction Guide for Developers, 7th Edition, published September 2012 (and any subsequent revisions) published by WRc plc.

ii. Treatment Systems for Small Communities, Business, Leisure Centres

and Hotels, 1999, published by the Environmental Protection Agency (EPA).

iii. Recommendations for Site Development Works for Housing Areas –

October 1998, published by the Department of the Environment and Local Government, now the Department of the Environment, Community and Local Government.

iv. Pumping Stations – Design for improved buildability and maintenance,

1998 (Report 182), published by the UK Construction Industry Research and Information Association (CIRIA).

Kildare County Council reserves the right to determine the appropriate design criteria for a particular development regardless of the contents and recommendations of the above publications.

4. HYDRAULIC DESIGN Kildare County Council has implemented the GDSDS within its administrative area. Consequently, Kildare County Council’s general requirements for all new drainage works in the County are contained in the GDSDS Regional Code of Practice for Drainage Works – Version 6.0.

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Design calculations to determine the hydraulic loading from a particular development shall comply with the following general design criteria unless specified otherwise:

a) The sewerage system shall be designed to cater for a peak flow of 6 time’s dry weather flow (6DWF).

EPA definition of DWF - DWF is the average daily flow during seven consecutive days without rain (excluding a period which includes public or local holidays), following seven days during which the rainfall did not exceed 0.25mm on any one day.

b) All pipework shall be laid to ensure self-cleansing velocities are achieved and maintained throughout the gravity sewerage system in the range 0.75m/sec – 3.0m/sec, when flowing half full. Minimum pipe size shall be 150mm diameter.

c) In Section 5.2.1 of the publication Greater Dublin Strategic Drainage

Study – Regional Drainage policies – Volume 2 – New Development - Chapter 5 – Foul Drainage Design, the normal hydraulic load from each domestic dwelling is equivalent to 650l/day. Consequently, peak design flow (6DWF) from each dwelling is equivalent to 3900l/dwelling/day.

d) When calculating hydraulic loads generated from industrial, schools,

hotels, hospitals or other commercial developments, reference shall be made to Table 3 of the EPA publication Treatment Systems for Small Communities, Business, Leisure Centres and Hotels, 1999. This document provides guidance on recommended wastewater loading rates from various commercial premises.

A design report containing all calculations for the gravity sewerage system within the proposed development and the foul pumping station and the rising main shall be submitted as part of a planning application. Where assumptions are made the Applicant is required to provide information clarifying these assumptions. It is recommended that Applicants liaise with the Water Services Department to confirm that the above design criteria are applicable to the proposed development prior to submitting a planning application. In some cases, particularly where a large development is planned or where there may be issues with the local public sewerage system, it may be necessary to revise the above design criteria. The Applicant shall seek clarification from the Water Services Department, if this is the case. In order to minimise capacity issues within the proposed gravity sewerage system for the proposed development and at the proposed foul pumping station, Applicants are required to ensure that the sewerage system within the development is fully sealed and waterproofed against surface and ground water infiltration. Applicants will be required to comprehensively test their drainage system during construction to verify that this is the case. Arrangements should be made to have this testing witnessed by Kildare County Council. A report should also be prepared by a competent and

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qualified Consulting Engineer certifying that the sewerage system has been tested and is fully sealed against infiltration. This report shall include the results of the testing of the sewerage system. Prior to testing it is recommended that the sewerage system be jet cleaned and that a CCTV pipeline survey be carried out to ensure that the sewerage system contains no obvious defects or signs of infiltration. An as-constructed survey of the sewerage system should also be arranged.

5. PUMPING STATION COMPOUND

a) A dedicated site is to be provided for the foul pumping station compound (Refer to Fig. 1). This will be additional to the public open space requirements of Kildare County Council at the time that the planning application is being submitted. Public open space is to be provided solely for the recreational use of the occupants and for no other purpose and should not be used to site a foul pumping station.

b) The foul pumping station shall be located upon a site where there is no

potential for flooding to take place. Particular consideration shall be given to the local topography and the position of the foul pumping station relative to adjacent streams, rivers and surface water drains. The Applicant may be requested to obtain and submit flood maps to confirm the proposed site for the proposed foul pumping station is suitable and has had no previous history of being prone to flooding.

c) The foul pumping station compound shall be fully secured against

unauthorised entry with min. 2.4m high boundary (boundary type to be approved by Kildare County Council) with 5.5m – 6.0m wide double leaf vehicular gates with lockable slide bolt and protective shroud to match the proposed boundary type. Fencing and gates shall be galvanised and powder coated steel in an appropriate colour/finish (usually RAL 6005 Green) with appropriate rails, posts, heads, supports and concrete foundations.

Fig. 1 – Typical foul pumping station compound

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d) The foul pumping station compound shall not overlook or be overlooked by adjacent houses/buildings. Any potential for visual impact shall be minimised and addressed as part of the overall design of the development.

e) Access into the site shall be via a 5.5m-6.0m wide paved roadway which is

fully kerbed and drained.

f) All chambers, kiosks, buildings, generator etc. shall be provided with a 2m wide concrete surround. A 1.5m wide concrete path shall also be provided linking up the various areas of the compound.

g) Differences in level within the foul pumping station compound shall be

avoided in order to avoid any potential trip hazards.

h) All remaining areas of the site shall be levelled and surfaced with anti-weed membrane and pebble material avoiding the need for future maintenance. Grassed areas shall not be included within the foul pumping station compound.

i) Access into and within the foul pumping station compound shall be arranged

so that it is suitable for vacuum tankers which can be expected to attend the foul pumping station during maintenance and desludging operations. Ideally, a turning bay shall be provided at a suitable location within the site to facilitate tankers accessing and leaving the site safely.

j) Suitable lighting shall be provided around the perimeter of the site and at all

working areas within the site to facilitate working during the winter and at night time. Lighting shall be controllable at the entrance gate (by key or push button) and also within the control building/kiosk. Site lighting shall not overspill or cause a nuisance to adjacent properties.

k) Doors to the control building/kiosk shall not open adjacent to any chamber in

order to reduce the risk of falls into an open tank. In general, chambers shall be at least 3m from the doors of the control building/kiosk.

l) A 4" metered water supply shall be provided within the site with a hydrant

adjacent to the pump sump for cleaning purposes. It will also be necessary to provide water in the control building/kiosk for welfare purposes. In low pressure areas, it may be necessary to provide a water storage/ booster pump arrangement to ensure sufficient water quantity/pressure is available for cleaning purposes.

m) An 110V power supply shall be provided adjacent to the pump sump, valve

chamber, emergency over flow tank.

n) Appropriate warning signage shall be erected:

i. At the entrance gates and around the perimeter fencing. ii. At all electrical equipment where there is a risk of electrocution.

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iii. At all tanks and chambers where there is a risk of falls, drowning etc.

iv. At ladders or platforms where there is a risk of falling from a height.

v. At all tanks or chambers where there is a difference in level and a potential for slips or trips.

vi. At any other locations within the site where specific hazards exist.

6. CONTROL BUILDING OR KIOSK In general a control building will be required for larger developments (refer to Fig. 2). For smaller developments it will usually be acceptable to accommodate the control equipment within a kiosk (refer to Fig. 3). However, the Applicant is required to clarify the exact requirements of the Water Services Department in writing when preparing a planning application for a proposed development which is to be served by a foul pumping station.

Fig. 2 – Typical foul pumping station control building

Fig. 3 – Typical foul pumping station control kiosk

Where it is proposed to provide a control building it shall comply with the following minimum requirements:

a) The control building shall be of minimum internal dimensions 4m x 4m.

b) The control building shall be positioned away (min. 3m) from the nearest chamber to avoid the risk of trips, slips and falls when entering and

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leaving the building. This is also to allow adequate working space during pump removal and other maintenance activities. In some instances, it may be necessary to provide a safety railing around chambers to minimise the risk of trips, slips and falls.

c) The doors of the control building shall not open out towards the pump

sump. The doors shall be heavy duty, vandal resistant with a secure locking system.

d) The control building shall be surrounded with a continuous concrete

footpath of minimum width 1.5m.

e) Suitable lighting and a sufficient number of 13A 220V sockets shall be provided within the control building.

f) A thermostatically controlled energy efficient space heater shall be

provided within the control building to prevent condensation in cold weather.

g) The building shall be plastered and painted internally.

h) Welfare facilities may be required within the control building i.e. a small

kitchen area and a separate bathroom with a toilet, wash hand basin and shower (tiled and painted). The Applicant is required to clarify the exact requirements of the Water Services Department in relation to welfare facilities in writing when seeking planning permission for the proposed development.

i) A small store room within the control building.

j) There may be a requirement to provide a fixed gas detection system

within the control building to monitor levels of hydrogen sulphide, explosive gases and oxygen. The Applicant is required to clarify the requirements of the Water Services Department in relation to gas detection.

7. CONTROL BUILDING CONSTRUCTION The control building shall be built in accordance with the following minimum standard:

a) 100mm solid block, cavity wall construction. b) Minimum 100mm cavity. c) Plastered and painted internally. d) 65mm thermal insulation (k value not greater than 0.04 w/mk). e) 19mm external render or exterior finish to match adjacent development. f) Pitched roof constructed from roof trusses designed to ISS 193. g) Finished with tiles or slates on sarking felt.

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h) 150mm insulation to be placed between joists (k value not greater than 0.04 w/mk).

i) Eaves to be finished with uPVC fascia and soffit. j) Floor construction to consist of 300mm thick hardcore compacted and

blinded with 1000 gauge DPM with 40mm insulation with 100 mm concrete slab.

k) DPC to be used around door lintel. l) All ducts between the control building/kiosk and the pump sump and flow

meter chamber shall be fully sealed to prevent liquid, odours or gases entering the control building/kiosk.

m) The control building wall is to include two permanent air vents one high and one low (vermin proof) on opposite walls.

n) The control building shall not include windows.

8. PUMP SUMP

a) Sump floor to be benched (30-45 degrees minimum) towards the pumps so that flow is efficiently directed into the pumps and in order to avoid flat or dead spots where solids can accumulate within the pump sump.

b) The gravity foul sewer shall discharge sewage into the pump sump

directly opposite the foul pumps and not on top of the pumps.

c) Ultrasonic level control shall be the preferred form of pump control. Probes shall be situated at the top of pump sump where they can easily be accessed for maintenance without the need to enter the sump. They shall also be positioned within the pump sump so that they do not become fouled or submerged in sewage. The depth of the pump sump shall be such that the highest normal operating level or ‘start’ level for the pumps is substantially below the invert level of the incoming gravity foul sewer. This will ensure that the pump sump provides sufficient storage capacity prior to the incoming gravity foul sewer surcharging or backing up when the pumps are not available.

d) Stainless steel pump guide rails and stainless steel lifting chains with a

lifting eye every metre shall be provided within the pump sump to facilitate the removal of the pumps.

e) A davit and davit socket shall be provided to facilitate the lifting and

removal of the pumps. The davit socket must be finished flush, cast in concrete and located centrally over the pumps. It must be positioned on the opposite side of the hinged part of the pump sump cover so that the pump sump cover, when open, will not interfere with the lifting out of a pump. Lifting davits and davit sockets must be rated to lift twice the weight of each pump set, with a minimum lifting capacity of 500 kg. Certification confirming this must be submitted. All lifting equipment shall be clearly tagged showing the safe working load and the date of the last inspection etc. At foul pumping sites where large/heavy pumps are to be used, it will be necessary to provide a suitably rated fixed gantry, electric

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hoist and adjacent power point. Clarification on lifting requirements at a site where large/heavy pumps are to be used shall be sought from the Water Services Department.

f) Pump cables shall have sufficient slack and shall be tidily wound and

secured to a stainless steel hook or bracket under the pump sump cover where they can be easily accessed and will not interfere with the lifting of a pump or become weighed down with rags/ debris.

g) Easy snap-on/off deconnectors shall be provided on all pump electrical

cables at the top of the pump sump to allow easy disconnection of the pumps from the power supply without the need for an electrician. Connectors and all electrical fittings within the pump sump shall comply with the IP68 Waterproof Standard.

h) A penstock shall be provided on the inlet into the pump sump which is

capable of being manually operated from the surface. This will facilitate the shutting off of flows into the pump sump when carrying out maintenance work. At larger foul pumping stations it may be necessary to provide a motorised actuator valve to operate penstocks.

i) The pump sump must be ventilated using a 5m high sewer vent stack

which can be erected at an appropriate location on the site.

j) Routine maintenance of the pump sump i.e. lifting pumps, accessing and disconnecting pump cables, accessing and disconnecting level sensors etc. shall be possible from ground level without the need for a confined spaces entry. The pump sump must be designed with this in mind.

9. PUMP / ELECTRICAL SPECIFICATION Equipment shall comply with the requirements of Part 3 of Sewers for Adoption – A Design and Construction Guide for Developers, 7th Edition, September 2012, (and any subsequent revisions) as published by WRc plc.

The following shall also be considered specifically in relation to the pumps:

a) Pumps to be fully submersible and arranged as duty/standby. b) At larger installations pumps arranged as duty/assist/standby may be

required.

c) Pumps shall be designed to allow min. 100mm solids passage.

a) Pumps shall be selected to achieve the most efficient hydraulic performance (min. 70%).

d) Pumps shall be capable of a minimum of 12 – 15 starts per hour without

the motor overheating.

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e) A plate shall be fitted over the pump chamber identifying Pump No.1 and

Pump No.2.

f) Oil and seal fail sensors shall be provided on all motor windings.

g) A three phase power supply shall be provided.

h) The electrical installation shall be designed, manufactured, installed, tested and certified by a registered electrical contractor in accordance with all current regulations and legislation. Installation shall also fully comply with all current Electrotechnical Council of Ireland Ltd. (ETCI), RECI and ECSSA requirements for electrical installations. Certification confirming this will need to be submitted.

i) It is the responsibility of the designer to ensure that Area Classification is

applied to the design of the foul pumping station in order to identify whether there is potential for flammable or explosive atmospheres to develop in and around the foul pumping station. All motors and electrical apparatus for installation in hazardous areas shall be rated for use in such areas. Reference shall be made to the following:

i. ATEX 137 workplace directive 99/92/EC, Minimum requirements

for improving the safety and health protection of workers potentially at risk from explosive atmospheres. Transposed in Ireland by SI No. 299 of 2007 Safety, Health & Welfare at Work (General Application) Regulations 2007.

ii. Health and Safety Authority publication Guide to the Safety,

Health and Welfare at Work (General Application) Regulations, 2007 – Part 8 Explosive Atmospheres at Places of Work.

iii. ATEX 95 equipment directive 94/9/EC, Equipment and protective

systems intended for use in potentially explosive atmospheres. Transposed in Ireland through the European Communities (Equipment and Protective Systems Intended For Use in Potentially Explosive Atmospheres) Regulations, 1999 (SI No. 83 of 1999).

There may be a requirement to supply and install a fixed gas detection system at some foul pumping stations to monitor levels of hydrogen sulphide, explosive gases and oxygen.

j) Electrical apparatus in these areas i.e. motors, control devices, fittings,

fixtures, wiring etc. shall be specially constructed, certified and installed in accordance with the relevant standards and codes of practice.

k) All equipment at the foul pumping station (electrical and mechanical)

shall be fully earthed.

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l) Rubber matting to be provided at control panels within buildings.

m) Min. 75mm diameter glycerine filled pressure gauges (diaphragm type)

with stainless steel case (IP65 rated) or digital pressure gauge/transmitter/logger shall be fitted on the delivery pipework from each pump so that pressure/head data can be recorded during pump operation.

10. ENERGY EFFICIENCY

a) Pumps shall be selected to achieve the most efficient hydraulic performance (min. 70%).

b) Pump motors and all other electrical equipment installed at the foul

pumping station shall be on the Sustainable Energy Authority of Ireland (SEAI) Triple E Product Register for energy efficiency or other acceptable international energy efficiency standard.

c) An energy efficiency audit shall be carried out on the installation by a

competent electrical engineer before its construction to ensure that the installation will meet all current energy efficiency standards. In the event that the audit recommends additions or improvements that will be cost effective over the next 10 years, these additions or improvements must be included in the final design of the foul pumping station. An energy efficiency audit of the installation post construction shall also be carried out. The Applicant is required to submit a copy of the before and after energy efficiency audits to the Water Services Department.

11. RISING MAIN The diameter of the rising main shall be such that the velocity of the discharge is within the range 0.75 – 1.8 m/second to ensure effective self-cleansing. The maximum velocity shall not exceed 3m/second. The internal diameter of all rising mains must be no less than 100mm and should be manufactured from material suitable for the pumping of sewage and with an appropriate pressure rating. The roughness value (Ks) used for the design of the pumping main shall be shown in calculations, and shall be in accordance with the latest edition of Tables for the Hydraulic Design of Pipes, Sewers and Channels published by HR Wallingford. Roughness values shall generally comply with Table 5.1.

The design of the rising main shall consider the following:

a) CIRIA Report 84 Control and suppression of pressure surges in pipelines and tunnels in relation to surge analysis and to minimise any potential for damage to the pumps and rising main due to sudden changes in pressure and/or sudden starting/stopping of the pumps. In some cases it may be

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necessary to design, supply, install and commission some form of surge protection/pressure release devices for the installation.

b) Retention time between pumping cycles and the potential for septicity

and odour generation. In cases where prolonged retention times increase the risk of septicity occurring or where a foul pumping station and rising main are to be sited in a sensitive location it will be necessary to:

i. Reduce the retention time in the rising main by increasing the

frequency of pumping cycles at the foul pumping station (possibly by using a smaller pump sump) or in some cases it may be possible to reduce the size of the rising main. This may require the addition of macerating equipment at the foul pumping station to prevent regular blocking of the pumps.

ii. Provide a chemical dosing facility including chemical dosing pumps

(duty/standby arrangement with variable stroke adjustment), bunded chemical storage container, chemical safety shower and eye wash, appropriate warning signage. Pumps shall be sited so that any chemical leaks which occur due to pump failure are contained within the bunded chemical storage container. The chemical dosing facility shall be housed within a secure weatherproof building/structure.

c) Ventilation of the pump sump, emergency overflow tank and the

standoff/discharge manhole at the end of the rising main, by installing vent stacks (min. 100mm diameter, 5m high) at appropriate locations to be agreed.

d) Provision of air release valves at high points and scour valves with

associated access chambers at low points along the length of the rising main where the rising main is rising and falling along its length.

e) Discharging to existing public foul sewers which are prone to surcharging

may require the Applicant to design a foul pumping station which will pump during off-peak periods only. This will require the provision of adequate storage facilities on-site to store sewage during peak periods. In these instances, there is an increased risk of septicity and odours arising requiring specific measures to mitigate the risks associated with this.

f) The rising main must be fully pressure tested and proven in accordance

with EN 805:2000 Water Supply – Requirements for systems and components outside buildings and EN 1610:1997 – Construction and testing of drains and sewers prior to being made live and used for pumping sewage. The Applicant is required to contact the Water Services Department in advance of testing to make arrangements to have the testing of the rising main witnessed. Following successful testing of the

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rising main a copy of the test results shall be provided to the Water Services Department.

g) An electromagnetic flow meter shall be installed on the rising main and

connected to a flow recorder in the control building/kiosk to measure and store current and cumulative flow readings.

12. STANDOFF/DISCHARGE MANHOLE In all cases where a rising main is discharging into the public sewerage system, a separate manhole (known as a discharge manhole – refer to Fig. 4) and a short section of gravity foul sewer (not in concrete to avoid corrosion by hydrogen sulphide) must be constructed. This discharge manhole and section of gravity foul sewer will dissipate pumping pressures and facilitate a transition from turbulent to steady flow of the pumped sewage prior to it reaching the public foul sewer. A rising main shall not discharge directly into the public sewer. The discharge manhole shall be protected internally against corrosion by hydrogen sulphide using a sulphate resistant mortar and plaster finish. The discharge manhole must also be ventilated using a sewer vent stack which can be connected to the discharge manhole and erected at the nearest adjacent footpath or verge. The exact position of the vent stack shall be agreed with the Water Services Department.

Fig. 4 – Detail of typical discharge manhole – sewer vent stack not shown

13. EMERGENCY OVERFLOW CHAMBER

An emergency overflow tank with storage capacity equivalent to 8/12/24 hours flow from the proposed development shall be provided in the event that:

a) The pumps block/breakdown and/or are unavailable

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b) A power cut or mechanical fault occurs at the foul pumping station

c) Incoming flows to the foul pumping station exceed the pumping capacity

of the foul pumps. The Applicant shall clarify the required storage capacity of the emergency overflow tank with Kildare County Council and shall ensure provision for emergency overflows/storage fully comply with the Department of the Environment Publication Urban Waste Water Treatment Directive (91/271/EEC) - Procedures and Criteria in relation to Storm Water Overflows. Any overflows from the pump sump into the emergency overflow chamber shall take place via an overflow pipe at an appropriate level within the pump sump. This overflow pipe shall be installed at a level no higher than the invert level of the incoming gravity foul sewer to ensure that no surcharging of the gravity pipeline occurs within the development. A non-return or flap valve shall be provided on this overflow pipe within the emergency overflow chamber to prevent backflow from the emergency overflow chamber into the pump sump. A second pipe at a lower level within the pump sump is required to allow flows to be returned to the pump sump from the emergency overflow chamber. A penstock which can be manually operated from the surface shall be provided on this pipe. At larger foul pumping stations it may be necessary to provide a motorised actuator valve to operate penstocks. The floor of the emergency overflow chamber shall be sloped (30-45 degrees minimum) and benched towards the return pipe to the pump sump to prevent solids being deposited in this chamber. There is also a need to provide an opening at either end of the emergency overflow chamber, when rectangular in shape, to facilitate efficient cleaning of the emergency overflow chamber and ensuring that no solids have been retained in the tank. The emergency overflow chamber shall also be ventilated using a sewer vent stack which can be erected at an appropriate location on the site.

14. VALVE CHAMBER The valve chamber shall be a separate chamber and shall be fully sealed and waterproofed against ground and surface water ingress. All pipe entries into this chamber from the pump sump shall be fully sealed. The valve chamber shall accommodate the following:

a) Provide a sluice valve/gate valve and non-return valve on each rising main from the pump sump.

b) Provide a sluice valve/gate valve and a 100mm diameter female Bauer

connection on the rising main to permit pumping out of the wet well by diesel pump/tanker during maintenance or failure of the foul pumping station.

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Figure 2.12 (Typical Arrangement of a Wet Well Submersible Pumping Station and Valve Chamber) of Sewers for Adoption – A Design and Construction Guide for Developers, 7th Edition, September 2012 (and any subsequent revisions) as published by WRc plc provides details of a typical valve chamber.

15. FLOWMETER AND FLOW METER CHAMBER A separate chamber of similar construction to the valve chamber at an appropriate location shall be provided for the flow meter which is to be fitted on the rising main. This chamber shall be fully sealed and waterproofed against ground and surface water ingress. All pipe and cable entries into this chamber from the valve chamber and control building/kiosk shall be fully sealed. The flow meter shall be an electromagnetic flow meter fitted on the rising main with associated fittings, valves and pipework which will transmit current and cumulative flow readings to a suitable flow recorder which is located in the pump control building/kiosk. The flow meter shall be positioned and installed as per the manufacturer’s instructions to ensure that accurate readings are recorded. A calibration certificate confirming the accuracy of the installation shall be submitted to the Water Services Department.

16. CHAMBER COVERS Access covers to sumps and tanks shall be manufactured to an appropriate European standard. Covers to the pump sump and valve chamber shall be hot dipped galvanised spring assisted /pneumatic type with integrated safety grid to protect against falls. They shall also be flush fitting with a chequer plate finish. All covers must be heavy duty, lockable and shall be designed to cope with any potential loadings on the site i.e. HGV/tanker/jet-vac – D400.

17. WELFARE FACILITIES In the event that the welfare facilities are to be provided within a control building they shall comply with the requirements outlined previously above.

Fig. 5 – Typical foul pumping station welfare kiosk

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In the event that the welfare facilities are to be installed within a kiosk (refer to Fig. 5) they shall comply with the following:

a) A wash hand basin with hot and cold water (an electric water heater will

be required).

b) A hose reel with 15m of hose for use during cleaning/maintenance work.

c) A weatherproof 13A 220V socket shall be provided.

d) Lighting shall be provided within the kiosk.

e) All water pipes shall be provided with a valve to isolate the supply.

f) All water pipes, valves and fittings shall be insulated against frost.

g) The water supply into the site shall be metered.

18. CONTROL PANEL The following shall be provided on the main control panel within the control building/kiosk:

a) Pump control panel c/w isolators, fuses, earthing etc. b) Main power isolator switch. c) Flow recorder and display. d) Run / duty / standby switch for pumps with manual and automatic

changeover. e) Manual/Off/Auto selector switch for each pump. f) Ammeter. g) Separate hours run meter for each pump. h) Run and trip lights for each pump. i) Heat/oil and water sensors on each pump and seal fail light. j) Pump reset buttons. k) KW/ KWhr meter with pulse output on mains if duty / standby

arrangement or on each individual pump if duty / assist arrangement. l) Frost protection heater. m) E.S.B. meter. n) A generator connection facility which will allow a portable or permanent

generator to be temporarily or permanently connected. o) All ducts between the control building/kiosk and the pump sump and flow

meter chamber shall be fully sealed to prevent liquid, odours or gases entering the control building/kiosk.

p) A Plug / input device shall be provided on the control panel which will enable a generator to be connected on a temporary or permanent basis. All necessary relays, fuses and switches shall be provided on the control panel.

q) A 13 amp 220V double socket.

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r) A dial out alarm system using GSM communication which will generate SMS Text Messages to advise the pumping station operators of faults that arise at the foul pumping station. Typical faults which will generate an alarm are:

i. Alarm 1 –High level alarm ii. Alarm 2 – Mains failure

iii. Alarm 3 - Pump Warning (Seal failure & over temperature) iv. Alarm 4 – Pump Tripped or Failure

The dial out alarm system shall use a non-volatile form of memory so that loss of mains power and backup battery failure will not require re-programming. The SIM card will store telephone numbers and program operating parameters.

19. TELEMETRY There may be a requirement to provide telemetry equipment in the control panel capable of collecting and transmitting flow and other operational data from the foul pumping station to another location to be agreed with the Water Services Department. Operational data would include flow data, high wet well level, mains power failure, level control system failure, no.1 pump running, no.2 pump running, no. 1 pump tripped, no. 2 pump tripped etc. The Applicant is required to clarify in writing with the Water Services Department whether telemetry is required at the proposed foul pumping station and what operational data is to be recorded.

20. GENERATOR In general a standby generator will be required for larger developments where a power failure could result in the capacity of the foul pumping station and emergency overflow tank being exceeded resulting in surcharging of the gravity foul system within the development and the potential for sewage overflows, flooding and pollution. Where a generator is to be provided it must be housed within a secure building/structure on-site. The building shall also accommodate a bunded fuel tank with sufficient storage capacity for the generator to operate for 12 hours. The installation shall comply with current ETCI wiring rules. The Applicant is required to confirm in writing with the Water Services Department whether a generator is to be provided. The Applicant is required to provide information in relation to the total power requirements at the site, the rating of the generator to be provided and any other relevant information.

21. ODOUR In Ireland there are currently no design criteria which can be used to determine or estimate odour levels which might arise at the boundary of a foul pumping station. Good design which ensures regular pumping cycles take place (ideally 6-12 pump starts per hour) and proper ventilation of the pump sump and emergency overflow chamber will, in most cases, prevent septicity arising. However, in some cases it will be necessary to provide a chemical dosing facility to prevent septicity and odour generation.

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It is vital to carefully consider the position of a foul pumping station within a development site. There must be lateral separation of at least 50m from the boundary of a foul pumping station site to the nearest adjacent habitable property in order to minimise any risk of an odours being detected at neighbouring properties. In general, where a pumped sewerage system is to be utilised, Applicants shall design the development around the foul pumping station so that proper provision is made for locating the foul pumping station in an appropriate location. Every development will be assessed on its own merits.

22. NOISE

In Ireland there are currently no national standards for noise emissions. The Guidance Note for Noise in Relation to Scheduled Activities published by the Environmental Protection Agency (EPA) 1995 provides general acoustic guidance for activities licensed by the EPA under the Integrated Pollution Control (IPC) licensing system i.e. activities listed in the First Schedule of the Environmental Protection Agency Act 1992. This guidance was updated in a second edition to reflect developments in legislation, licensing requirements and EPA policy since 1995 and to include additional guidance for waste activities (e.g. landfills and transfer stations) listed in the Third and Fourth Schedules to the Waste Management Acts 1996 to 2003.

However, these guidance notes do not provide requirements in relation to noise emissions from a foul pumping station. As a result, the Applicant is advised to maintain a lateral separation of at least 50m from the boundary of a foul pumping station to the nearest adjacent habitable property. Every development will be assessed on its own merits. All potential noise sources shall be assessed and where required mitigation measures must be included in the design to attenuate noise emissions and to reduce any potential for nuisance. This can be achieved using measures such as enclosing control equipment and generators in a building, fitting noise dampening canopies, erecting sound barriers around equipment, landscaping, boundary treatment etc. The effectiveness of mitigation measures will need to be proven by carrying out an acoustic/noise survey before being accepted by the Water Services Department.

23. DRAWINGS Proposals for foul pumping stations and rising mains shall include drawings detailing the following:

a) Plan layout of the pumping station site showing the pump sump,

emergency overflow tank, valve chamber, flowmeter chamber, site boundary treatment and gates, site lighting, site surfacing, access roadway for vehicles and tankers, turning bays, parking areas etc. Applicants shall refer to Figure 2.11 (Typical Pumping Station Layout) and Figure 2.12 (Typical Arrangement of a Wet Well Submersible Pumping Station and Valve Chamber) of Sewers for Adoption – A Design and

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Construction Guide for Developers 7th Edition September 2012 (and any subsequent revisions) as published by WRc plc.

b) Sectional drawings detailing the pump sump / emergency overflow

storage tank / valve chamber / flowmeter chamber etc.

c) Plan, elevation and section detailing the pump control building/kiosk.

d) Plan and longitudinal section of the gravity foul sewer(s) discharging into the foul pumping station.

e) Plan and longitudinal section of the rising main including the

standoff/discharge manhole and section of new gravity foul sewer between the standoff/discharge manhole and the final connection at the existing public foul sewer.

Drawings shall show all relevant information including ground, invert and cover levels, pipe sizes, pipe materials, gradients, chainages, existing services etc.

24. INSPECTIONS DURING THE CONSTRUCTION OF THE FOUL PUMPING STATION

Following the granting of planning permission and the commencement of construction, the Applicant will be required to facilitate regular inspections by Kildare County Council of the foul pumping station and the rising main during construction and installation. A programme shall be agreed by the Applicant with Kildare County Council for regular site meetings/inspections, the taking of photographs etc. The frequency and scope of site meetings/inspections shall be agreed during the planning process and prior to the commencement of construction.

25. COMMISSIONING OF THE FOUL PUMPING STATION The Applicant is required to make arrangements with Kildare County Council to witness the commissioning of the foul pumping station. Prior to this, the Applicant will be required to obtain a sewerage connection permit from the Water Services Department authorising a connection to the public sewerage system. It may also be necessary to obtain a road opening licence from the Roads Department to authorise the carrying out of excavations in the public road to facilitate the connection. The Applicant will also be required to submit a commissioning report for the foul pumping station, prepared and certified by a competent and qualified Consulting Engineer, detailing the successful commissioning of the foul pumping station. Written approval to commence full operation of the foul pumping station will only be issued by the local authority once it has been confirmed that the foul pumping station has been constructed in compliance with the above and that all necessary documentation has been provided.

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26. TAKING IN CHARGE OF THE FOUL PUMPING STATION When seeking the taking in charge of the foul pumping station by the local authority, the Applicant shall arrange an inspection of the foul pumping station with the Planning Department/Development Control Section and the Water Services Department of Kildare County Council. Following this inspection it may be necessary for the Applicant to carry out remedial works before the foul pumping station can be taken in charge. The Applicant shall provide a full set of as-constructed drawings and an Operating and Maintenance Manual (O&M) containing all relevant technical information, design reports, commissioning report, operating manuals, servicing manuals, warranties, spare parts list, PLC files and settings, test certificates for lifting equipment etc. Upon successful completion of the above, the Water Services Department will advise the Planning Department that the foul pumping station can be taken in charge. As part of the taking in charge process, the Applicant will be required to make arrangements to transfer legal ownership of the foul pumping station, the land upon which it is located, the rising main and all related access rights and wayleaves. The Applicant will be required to confirm agreement to the above in writing prior to the installation being taken in charge.

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27. CHECKLIST A

PRE-PLANNING STAGE– FOUL PUMPING STATION

1. Has the feasibility of using a gravity sewerage system been examined? Y/N

2. In the event that a pumped sewerage system is proposed has a detailed engineering report been prepared outlining why a gravity sewerage system cannot be used to service the development? Y/N

3. Did you consult with the Water Services Department and advise that a

planning application for the development will be made on the basis that the development will be serviced using a pumped sewerage system? Y/N

4. The Water Services Department may require that the proposed pumped

sewerage system be designed to cater for lands outside the development site or that co-operation between a number of developers is required. Has this been considered in this instance? Y/N

If so, provide details: ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ ____________________________________________________________

5. Do you intend using an existing privately owned sewerage system (gravity/pumped) to service your development? Y/N

If so, provide details: ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ ____________________________________________________________

6. In the event that you intend using an existing privately owned sewerage

system (gravity/pumped) to service your development, you will be required to provide written confirmation from the owner that their permission has been obtained. Has a letter of consent been obtained? Y/N

Continued overleaf

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SIGNED: ______________________________________ NAME (Block Capitals) ______________________________________ POSITION ______________________________________ COMPANY ______________________________________ CONTACT NUMBER ______________________________________ EMAIL ADDRESS ______________________________________

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28. CHECKLIST B

PLANNING STAGE– FOUL PUMPING STATION

Design of a pumped sewerage system 1. Have you considered the contents of Checklist A? Y/N 2. Has the pumped sewerage system been designed in accordance with the latest version of the Kildare County Council publication “Requirements for foul pumping stations and associated infrastructure”? Y/N 3. Has a detailed design report for the pumped sewerage system been submitted to the Water Services Department for assessment as part of a planning application? Y/N

4. Have the following items been fully addressed in the design report:

( to confirm) a. Pumping station loading and capacity requirements b. Rising main design c. Odours d. Noise e. Discharge manhole

i. Have you agreed a location for the vent stack? f. Drawings g. Technical manuals for all equipment proposed h. Pumping station compound

i. Have you agreed a suitable boundary treatment? i. Pump sump

i. Have you clarified lifting equipment requirements? j. Pump/electrical specification k. Energy efficiency l. Emergency overflow chamber

i. Have you agreed required storage capacity? m. Valve chamber n. Flowmeter and flow meter chamber o. Chamber covers p. Control building or kiosk

i. Have you clarified whether a kiosk or building is required? ii. Have you clarified whether fixed gas detection is required?

q. Control building construction r. Welfare facilities s. Control panel t. Telemetry

i. Have you clarified whether telemetry is required? u. Generator

i. Have you clarified whether a generator is required? Continued overleaf

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5. Who is the designer of the foul pumping station and the rising main?

NAME (Block Capitals) ______________________________________ POSITION ______________________________________ COMPANY ______________________________________ CONTACT NUMBER ______________________________________ EMAIL ADDRESS ______________________________________

SIGNED: ______________________________________ NAME (Block Capitals) ______________________________________ POSITION ______________________________________ COMPANY ______________________________________ CONTACT NUMBER ______________________________________ EMAIL ADDRESS ______________________________________

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29. CHECKLIST C

CONSTRUCTION STAGE – FOUL PUMPING STATION (Submit with commencement notice prior to construction commencing)

Inspections during the construction of a foul pumping station 1. Has a programme of regular inspections been agreed with Kildare County

Council during the construction of the foul pumping station? Y/N

2. With whom in Kildare County Council did you agree a programme of regular inspections during the construction of the foul pumping station and rising main?

NAME (Block Capitals) ______________________________________ POSITION ______________________________________

3. Have you arranged to have the testing of the sewers and manholes within

the development witnessed by Kildare County Council? Y/N

4. With whom in Kildare County Council did you arrange to have the testing of the sewers and manholes witnessed?

NAME (Block Capitals) ______________________________________ POSITION ______________________________________ 5. Who is the nominated on-site contact in relation to accessing the site /

arranging inspections etc.?

NAME ______________________________________ POSITION ______________________________________ CONTACT NUMBER ______________________________________ EMAIL ADDRESS ______________________________________

6. Have you applied for and obtained a sewerage connection permit from

Kildare County Council to permit a connection to the public foul sewerage system? Y/N

PERMIT No.: ______________________________________ DATE GRANTED: ______________________________________ 7. Have you applied for and obtained a road opening licence from Kildare

County Council to permit works to be carried out in the public road including footpaths and verges? Y/N

LICENCE No.: ______________________________________ DATE GRANTED: ______________________________________ Continued overleaf

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SIGNED: ______________________________________ NAME (Block Capitals) ______________________________________ POSITION ______________________________________ COMPANY ______________________________________ CONTACT NUMBER ______________________________________ EMAIL ADDRESS ______________________________________

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30. CHECKLIST D

PRE-COMMISSIONING STAGE – FOUL PUMPING STATION (Submit prior to final commissioning)

1. Was the foul pumping station construction inspected at regular intervals by Kildare County Council? Y/N 2. Who witnessed the construction of the foul pumping station and rising main on behalf of Kildare County Council?

NAME (Block Capitals) ______________________________________ POSITION ______________________________________ 3. Have you arranged to have the final commissioning of the foul pumping station witnessed by Kildare County Council? Y/N

If so, by whom: NAME (Block Capitals) ______________________________________ POSITION ______________________________________ 4. Have you arranged to have the final commissioning of rising main witnessed Kildare County Council? Y/N If so, by whom: NAME (Block Capitals) ______________________________________ POSITION ______________________________________

SIGNED: ______________________________________ NAME (Block Capitals) ______________________________________ POSITION ______________________________________ COMPANY ______________________________________ CONTACT NUMBER ______________________________________ EMAIL ADDRESS ______________________________________

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31. CHECKLIST E

POST-COMMISSIONING STAGE – FOUL PUMPING STATION (Submit following successful commissioning

of the foul pumping station)

1. Have you submitted a commissioning report for the foul pumping station and rising main to the Water Services Department? Y/N

2. Have you submitted an as-constructed survey of the gravity sewerage system, foul pumping station and rising main to the Water Services Department? Y/N

3. Have you submitted a CCTV survey of the gravity sewerage system and rising main to the Water Services Department? Y/N

SIGNED: ______________________________________ NAME (Block Capitals) ______________________________________ POSITION ______________________________________ COMPANY ______________________________________ CONTACT NUMBER ______________________________________ EMAIL ADDRESS ______________________________________

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32. REFERENCES a) Greater Dublin Strategic Drainage Study (GSDS) – Regional Drainage policies

– Volume 2 – New Development - Chapter 5 – Foul Drainage Design published in March 2005 by the Dublin Region Local Authorities as part of the Greater Dublin Strategic Drainage Study.

b) Regional Code of Practice for Drainage Works - Version 6.0 (and any

subsequent revisions) published March 2005 by the Dublin Region Local Authorities as part of the Greater Dublin Strategic Drainage Study.

c) Sewers for Adoption – A Design and Construction Guide for Developers, 7th

Edition, published September 2012 (and any subsequent revisions) published by Water UK/WRc plc.

d) Treatment Systems for Small Communities, Business, Leisure Centres and

Hotels, 1999, published by the Environmental Protection Agency. e) Recommendations for Site Development Works for Housing Areas – October

1998, published by the Department of the Environment and Local Government (now known as the Department of the Environment, Community and Local Government).

f) Pumping Stations – Design for improved buildability and maintenance, 1998

(Report 182), published by the UK Construction Industry Research and Information Association (CIRIA).

g) Guidance Note for Noise in Relation to Scheduled Activities published by the

Environmental Protection Agency (EPA) 1995. h) Control and suppression of pressure surges in pipelines and tunnels, CIRIA

Report 84, Thorley, A.R.D. & Enever, K.J., published 1979, reprinted 1985. i) Tables for the Hydraulic Design of Pipes, Sewers and Channels: 8th Edition (2

volume set), 2006, published by HR Wallingford. j) EN 805:2000 Water Supply – Requirements for systems and components outside

buildings – European Standard. k) EN 1610:1997 – Construction and testing of drains and sewers – European

Standard. l) Urban Waste Water Treatment Directive (91/271/EEC) Procedures and Criteria

in relation to Storm Water Overflows published by the Department of the Environment (now known as the Department of the Environment, Community and Local Government).