attachment no: c.1 operational information ...storm tank dimensions length: 21m width: 5m depth of...

Trim Waste Water Discharge Licence Application

ATTACHMENT No: C.1

OPERATIONAL INFORMATION REQUIREMENTS

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C.1 Operational Information Requirements

Provide a description of the plant, process and design capacity for the areas of the waste water works where discharges occur, to include a copy of such plans, drawings or maps, (site plans and location maps, process flow diagrams), and such other particulars, reports and supporting documentation as are necessary to describe all aspects of the area of the waste water works discharging to the aquatic environment. Maps and drawings must be no larger than A3 size. Wastewater Treatment Plant

Introduction

The Trim wastewater treatment works, located in the townland of Iffernock and which can

cater for a population equivalent of 12,000 was commissioned in 1999. This treatment

works was designed to be readily extendable to service a population equivalent of 16,000

through the provision of an additional aeration tank and clarifier.

Summary of Plant

The treatment plant consists of the following:

Inlet works comprising: 2 No. mechanically raked screens; screenings washing and

compaction; automatic grit removal and grit washing

Anoxic tank with submersible mixer

2 No. aeration basins with fine bubble diffused air system

2 No. circular clarifiers with half bridge scraper systems

Sludge return and sludge waste pumping station

Washwater pumping station

Sludge press building with 2 No. decanter centrifuges for sludge dewatering

Stormwater tanks and stormwater pumping station

Chemical dosing plant for phosphorus removal

Final effluent pumping station

SCADA control system

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Summary of Design Parameters

Parameter Value

Population equivalent 12,000

Daily dry weather flow 2,700 m3/day

Maximum flow to full treatment 105 l/s

Maximum flow to inlet works 315 l/s

BOD5 720 kg/day

Suspended solids 888 kg/day

Total phosphorus 30 kg/day

Total nitrogen 120 kg/day

Emissions from Plant

The final effluent and the overflow from the storm tanks gravitate to the final effluent

pumping station. The effluent is then pumped via a 300mm diameter rising main for

200m. There is a 400mm diameter gravity main, 1350m length, to the discharge point

PSW01 in the River Boyne. There is a diffuser at the discharge point in the River Boyne.

The effluent loads to the river and the resultant increase in concentration at full design load to the plant (12,000pe) is summarised as follows:

Parameter BOD SS P NH3 Nitrate

Effluent loads (kg/day) 67.5 94.5 5.4 108 81

Increase in river concentration (mg/l) at 95 percentile flows 0.260 0.365 0.021 0.417 0.313 Increase in river concentration (mg/l) at average flows 0.043 0.061 0.003 0.070 0.052

Description of Waste water treatment process

The flow to full treatment is controlled at the inlet works using an overflow weir and an

automatic penstock. Flows greater than 3 DWF overflow to the storm tanks. The

contents of the storm tanks are returned to the inlet works on cessation of the storm.

Influent to the works is screened using fine screens duty/assist fine screens at the inlet

works with an emergency bypass manual screen. Screenings are washed and dewatered

prior to disposal. Grit is automatically removed using a vortex type grit removal system.

Grit is washed prior to disposal using a grit classifier.

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Following this preliminary treatment the flow to full treatment is split between the three

aeration basins in the anoxic tank. Each aeration tank has a fine bubble diffused air

system fed by air blowers (2 duty/1 standby). Oxygen monitoring in the aeration basins

controls the level of air fed to each tank.

Ferric sulphate is dosed into the mixed liquor downstream of the aeration tanks to

remove phosphorus from the effluent. The phosphorus is removed in the settled sludge

from the clarifiers.

The outlet from the aeration tanks goes three separate circular clarifier tanks with half-

bridge scraper units. The settled sludge from the clarifiers goes to the sludge pumping

station. Waste sludge is pumped to the picket fence thickener for thickening prior to

dewatering. Sludge is dewatered using a centrifuge in the sludge dewatering building.

The remaining sludge is returned to the aeration basins to maintain the mixed liquor

suspended solids in the tanks. The clarified effluent from the clarifiers gravitates to the

final effluent pumping station.

Please see drawing 20285-DL-TM-06, Attachment C1.A for flow diagram and drawing

20285-DL-TM-05, Attachment C1)

C.1.1 Storm Water Overflows

There have been 2 No. storm overflows identified. The frequency of overflows has been

estimated based on the information available on site. It is considered that the overflows

are within the number which would be recommended by “Procedures and Criteria in

relation to Storm Water Overflows”. However, to fully estimate the number, volume and

frequency of overflows a hydraulic model is required. Please refer to drawing 20285-DL-

TM-04, Attachment B5.

For each storm water overflow within the waste water works the following information shall

be submitted:

• An assessment to determine compliance with the criteria for storm water overflows,

as set out in the DoEHLG ‘Procedures and Criteria in Relation to Storm Water

Overflows’, 1995 and any other guidance as may be specified by the Agency, and

• Identify whether any of the storm water overflows are to be decommissioned, and

identify a date by which these overflows will cease, if applicable.

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Stormwater Overflow No. 1: Ref: SW02

Location: River Boyne

National Grid Reference: E281825, N256901

Description:

The wastewater treatment plant is sized to accept three times the dry weather flow in

accordance with standard practice. All flows greater than this overflow to the stormwater

tank. An overflow weir has been provided at the inlet works to the wastewater treatment

plant to control flows to full treatment to 3 DWF. Flows in excess of this, up to 9 DWF

overflow to 2 No. storm tanks.

Storm Tank Dimensions

Length: 21m

Width: 5m

Depth of side wall: 5.3 to 5.6m

Volume: 850m3

Total volume of 2 No. tanks: 1700 m3

The storm tank volume required based on the “Procedures and Criteria in relation to

Storm Water Overflows” no storage tank is required where there is a dilution of > 8. At

the average flows to the plant of 2,700m3/day there is a dilution of 96. There will be a

dilution factor of ≥ 8 at flows up to 12 DWF.

There is a 375mm diameter overflow from the storm tank to the final effluent pumping

station. There is a 400mm diameter emergency overflow from this pumping station

directly to the River Boyne. The frequency and quantity of discharge is unknown.

Compliance with the Urban Waste Water Directive 91/271/EEC:

The flowrate in the River Boyne at the discharge point of the overflow is: 3m3/s

The Dry Weather Flow to the wastewater treatment plant is 0.0312m3/s. The dilution

factor in the River Boyne is: 3 / 0.0312= 21.

The Urban Wastewater Treatment Directive 91/271/EEC states that there is no required

storage volume based on a dilution rate of >8.

The volume of the stormwater tanks as detailed above is therefore deemed to be

adequate.

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Stormwater Overflow No. 2: Ref: SW03

Location: River Boyne

National Grid Reference: E280212, N256894 Description: There is an overflow on the “12 line” at Manhole 12.1. Sewer line 12 at Manhole 12.1 is a

381mm diameter AC pipe which discharges via a siphon under the River Boyne to the “4

line”. There is a 300mm diameter overflow from Manhole 12.1 to the River Boyne. The

number of overflows per annum and overflow volume is unknown.

Compliance with the Urban Waste Water Directive 91/271/EEC:

Formula A, as detailed in the Urban Wastewater Treatment Directive 91/271/EEC, relates

to storm overflows within the sewerage network. There is one storm overflow within the

sewerage network as detailed above.

P = design domestic population - Trim is approximately 9,240 PE

E = design industrial effluent flow – Trim is approximately 2,760 PE

DWF = Design dry weather flow – Trim = 6,695.68 m3/day

Formula A = DWF + 1.36P + 2E

= (6,695.68m3/day)+(1.36x9,240)+(2x2,760)

= 20,782.08 m3/day

C.1.2 Pumping Stations

There are five main pumping stations in Trim. The locations of these three pumping

stations are shown on drawing 20285-DL-TM-01, Attachment B1.

Pumping Station No. 1 (Castle Street P.S.)

The main pumping station for the town (Pumping Station No. 1) is located in Castle

Street. It consists of two separate interlinked sumps and pumping installations with a

maximum combined capacity to deliver 220 l/sec to the treatment works. Pumping

Station No. 1 is the main pumping station for Trim and pumps approximately 80% of the

flow to the wastewater treatment plant. The design dry weather flow to the plant is

2,700m3/day (31.25 l/s) at 12,000 PE. The pumping station capacity of 220 l/s is

greater than 8 DWF. At full design load the emergency overflows will be infrequent. The

current loads are less than the full design load and are therefore less frequent.

• There is one duty and one standby pump • There is no backup power supply in case of a power failure • Pump sump dimensions: 5.7m x 3.2m x 2.1m (depth to overflow)

Storage Volume: 38.3m3

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• Pumping Station No. 1 emergency overflow discharges to the River Boyne from manhole 4.1. This is an open discharge to the river.

• The frequency and duration of the overflows is unknown. Note; the emergency overflow will only overflow in the event of power/pump failure.

Pumping Station No. 2 (Newtown PS)

A second smaller pumping station (Pumping Station No. 2) is located adjacent to the St.

Peters / Newtown Bridge on the River Boyne in Newtown and services developments to

the northeast of the town in the townlands of Blackfriary, Lackanash and Newtown

(drawing 20285-DL-TM-01, Attachment B1).

• There is one duty and one standby pump • There is no backup power supply in case of a power failure • Pump sump dimensions: 5.7m x 3.2m x 2.1m (depth to overflow)

Storage Volume: 38.3m3 • Pumping Station No. 1 emergency overflow discharges to the River Boyne from. This

is an open discharge to the river. • The frequency and duration of the overflows is unknown.

Pumping Station No. 3

A third local pumping station (Pumping Station No. 3) located off Watergate Street has

recently been replaced (drawing 20285-DL-TM-01, Attachment B1). The capacity of the

pumps is 40 l/s each.

• There is one duty and one standby pump • There is no backup power supply in case of a power failure • Pump sump dimensions: 2.5m x 2m x 4m (depth to overflow) Storage Volume: 20m3 • Pumping Station No. 3 emergency overflow discharges to a surface water sewer (at

manhole PS 2.1) which then discharges to the River Boyne. The frequency and duration of the overflows is unknown. The emergency overflow at pumping station No4 also discharges to the same surface water sewer. Note; the emergency overflow will only overflow in the event of power/pump failure.

Pumping Station No. 4

A third local pumping station (Pumping Station No. 4) located beside St Lomans Park, has

recently been replaced (drawing 20285-DL-TM-01, Attachment B1). The capacity of the

pumps is 35 l/s each.

• 2 No. pumps (Duty/Standby) • There is no backup power supply in case of a power failure • Pump sump dimensions: 2.5m x 2m x 3.9m (depth to overflow) • Storage Volume: 19.5m3 • Pumping Station No. 4 emergency overflow discharges, via a 250mmø pipe, to a

surface water sewer (at manhole PS2.12) which then discharges to the River Boyne. The frequency and duration of the overflows is unknown. The emergency overflow at pumping station No4 also discharges to the same surface water sewer. Note; the emergency overflow will only overflow in the event of power/pump failure.

Pumping Station No. 5 (Mill Lane)

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Pumping Station No. 5 was constructed to cater for a small number of houses around Mill

Lane and Mill Street (drawing 20285-DL-TM-01, Attachment B1). It is part of the sewer

network to flows, by gravity, to the castle street pumping station and then on to the

treatment plant.

• 2 Number pumps (duty and standby pumps) • There is no backup power supply in case of a power failure • Pumping Station No. 5 emergency overflow discharges, via a 250mmø pipe, to a

surface water sewer (at manhole S1.26) which then discharges to the River Boyne. The frequency and duration of the overflows is unknown. The emergency overflow at pumping station No4 also discharges to the same surface water sewer. Note; the emergency overflow will only overflow in the event of power/pump failure.

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ATTACHMENT No: C1.A

FLOW DIAGRAM

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ATTACHMENT No: C.2

OUTFALL DESIGN AND CONSTRUCTION

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C.2 Outfall Design and Construction

Provide details on the primary discharge point & secondary discharge points and storm overflows

to include reference, location, design criteria and construction detail.

Primary Discharge – Effluent Outfall – PSW1 (E283139, N256406)

Treated effluent is discharged from the wastewater treatment plant to the River

Boyne via a single outfall. The final effluent pumping station pumps the final

effluent and any overflow from the stormwater tanks via a 300mm diameter

rising main for 200m. The final effluent then gravitates via a 400mm diameter

gravity main to the primary discharge point PSW01. It is designed to be below

the water level of the river at all times of the year and includes a diffuser on the

outlet.

The primary discharge point is 1350m down stream of the treatment plant due to

the proximity of the Kilcairn water abstraction point (see drawing 20285-DL-TM-

09 in attachment F2)

Secondary discharge points

There are no secondary discharge points.

Storm Overflow Point, Ref: SW02 (E281825, N256901)

The overflow from the storm tanks gravitates via a 375mm pipeline to the final

effluent pumping station. There is a 400mm diameter emergency overflow, with

flap valve, from this pumping station directly to the River Boyne. As per drawing

20285-DL-TM-04 in attachment B5.

Storm Overflow Point, Ref: SW03 (E280212, N256894)

There is an overflow on the “12 line” at Manhole 12.1. Sewer line 12 at Manhole

12.1 is a 381mm diameter AC pipe which discharges via a siphon under the River

Boyne to the “4 line”. There is a 300mm diameter overflow from Manhole 12.1 to

the River Boyne. As per drawing 20285-DL-TM-04 in attachment B5.

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ATTACHMENT No: D1

Discharge(s) to Surface Waters

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Meath Co.Co. Results for Trim WWTP (grab samples) Date 10-Jul-07 09-Aug-07 24-Sep-07 18-Oct-07 07-Nov-07 17-Dec-07 22-Jan-08 21-Feb-08 05-Mar-08 18-Apr-08 05-Jun-08 25-Jun-08

Parameter Inf Inf Inf Inf Inf Inf Inf Inf Inf Inf Inf Inf BOD mg/l 170 168 533 281 407 297.5 84.5 333 312.5 328 282.8 182 COD mg/l 559 377 890 948 1305 659 190 376 413 701 715 344 TSS mg/l 156.5 129 522 268 384 106 88 148 102 313 139 Tot P mg/l 7.33 7.39 0.436 10.7 11.8 9.49 3.55 7.34 8.65 8.99 10.7 5.68 Tot N mg/l 51 45.4 66.7 76.3 72.9 69.4 20.9 67.3 65.1 13.5 73.7 41.3

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ATTACHMENT No: D2

Emission Points

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Trim WWTW - Table D2PT_CD PT_TYPE LA_NAME RWB_TYPE RWB_NAME Designation EASTING NORTHING

PSW1 Primary Discharge Point

Meath County Council

River River Boyne SAC 283139 256406

SW2 Stormwater Overflow Meath County Council


SW3 Stormwater Overflow Meath County Council


Receiving Water Body Name (e.g., River Suir)

Protected Area Type (e.g., SAC, candidate SAC, NHA, SPA etc.)

6E-digit GPS Irish National Grid Reference

6N-digit GPS Irish National Grid Reference

Point Code Provide label ID’s

Point Type (e.g., Primary/ Secondary/ Storm Water Overflow)

Local Authority Name (e.g., Donegal County Council)

Receiving Water Body Type (e.g., River, Lake, Groundwater, Transitional Coastal)

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ATTACHMENT No: E3

Location of Monitoring and Sampling Points

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Trim WWTW - Table E3PT_CD PT_TYPE MON_TYPE Easting Northing VerifiedPoint Code Providelabel ID’s assignedin section E ofapplication

Point Type (e.g.,Primary, Secondary,Storm Water Overflow)

Monitoring Type M =Monitoring S =Sampling

6E-digit GPSIrish NationalGrid Reference

6N-digit GPS IrishNational GridReference

Y = GPS used N =GPS not used

aSW1u Primary - Upstream S E281652 N256844 YaSW1d Primary - downstream S E283625 N257062 Y

ESW1 Effluent S E281817 N256871 YISW1 Influent S E281817 N256871 Y

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ATTACHMENT No: E4

Sampling Data

(Details of compliance with applicable monitoring requirements and treatment standards)

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Meath Co.Co. Results for Trim WWTP (grab samples) Date 10-Jul-07 09-Aug-07 24-Sep-07 18-Oct-07 07-Nov-07 17-Dec-07 22-Jan-08 21-Feb-08 05-Mar-08 18-Apr-08 05-Jun-08 25-Jun-08 02-Ju

Parameter Inf Inf Inf Inf Inf Inf Inf Inf Inf Inf Inf Inf InBOD mg/l 170 168 533 281 407 297.5 84.5 333 312.5 328 282.8 182 13COD mg/l 559 377 890 948 1305 659 190 376 413 701 715 344 25TSS mg/l 156.5 129 522 268 384 106 88 148 102 313 139 28Tot P mg/l 7.33 7.39 0.436 10.7 11.8 9.49 3.55 7.34 8.65 8.99 10.7 5.68 10Tot N mg/l 51 45.4 66.7 76.3 72.9 69.4 20.9 67.3 65.1 13.5 73.7 41.3 7

Parameter Eff Eff Eff Eff Eff Eff Eff Eff Eff Eff Eff Eff EfBOD mg/l 1.4 2.78 2.78 2.48 2.7 3.1 2.95 4.4 5.45 3 5.8 2.5 4.COD mg/l 26.2 89.7 35.3 23.2 38.3 33.7 26.7 32.7 30 48.8 59.1 40.4 3TSS mg/l 2.25 5.6 16 8 5.6 7.6 1.6 9.2 8.4 10.4 7.6 11Tot P mg/l 0.272 0.642 0.421 0.269 0.211 1.68 1.15 0.282 0.506 0.395 0.925 0.685 0.5Tot N mg/l 9.82 8.74 7.64 22.1 24.9 12.6 5.45 19.7 18.4 13.2 22.7 10.4 11

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ATTACHMENT No: F1

ASSIMILATIVE CALCULATIONS

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o Give summary details and an assessment of the impacts of any existing or

proposed emissions on the environment, including environmental media other than those into which the emissions are to be made.

The River Boyne is monitored upstream of the wastewater treatment plant at and Station No. 1000 (Derrinydaly Bridge) and downstream at Station No. 1400 (u/s Knightsbrook R confl.). The water quality upstream of the wastewater treatment plant was classified as Q4 in 2003 showing an improvement from Q3-4 in 2000. The water quality downstream of the wastewater treatment plant was classified as Q3-4 in 2003 improved from Q3 in 2000 and 1996.

Monitoring data for the effluent from the primary discharge point is included in Table D1 and monitoring data from monitoring points upstream and downstream of the primary discharge point is included in Table F1.

o Tables F.1(i)(a) & (b) should be completed for the primary discharge point. Tables F.1 (i)(a) & (b) are completed for the primary discharge point

o For discharges from secondary discharge points Tables F.1(ii)(a) & (b) should be completed. Furthermore, provide summary details and an assessment of the impacts of any existing or proposed emissions on the surface water or ground (aquifers, soils, sub-soils and rock environment), including any impact on environmental media other than those into which the emissions are to be made.

There are no secondary discharge points. Tables F.1 (ii)(a) & (b) are therefore not completed.

There are no impacts on ground water or other environmental media. The impact

of the primary discharge point on the River Boyne is evaluated in the Waste

Assimilative Capacity calculations below.

Waste Assimilative Capacity Calculations

The treated effluent from the Wastewater Treatment Works in Castletown-Tara

(Dunshaughlin) discharges to the River Boyne. The effluent discharge standards

from the wastewater treatment plant have been reviewed in terms of the design

population equivalents of the works taking into account the most recent Biological

Water Quality Data published by the EPA for the River Boyne. The closest

upstream chemical data for the River Boyne for 2001-2003 is at Derrinydaly

Bridge. Chemical data for 2001-2003 is available for Station No. 1400, u/s

Knightsbrook R. confl. This data has been used in the waste assimilative capacity

calculations.

The primary regulatory guidelines for effluent standards, as outlined in Section 2,

are the Urban Wastewater Treatment Regulations, 2001 (S.I. 254 of 2001) and

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the Water Quality Standards for Phosphorus (S.I. 258 of 1998). The water

quality requirements are dependent on the background values and the flow in the

river (i.e. assimilation capacity).

The biological quality ratings for the River Boyne upstream and downstream of

the existing wastewater treatment plant are detailed in Table 1.

TABLE 1 BIOLOGICAL QUALITY RATINGS (Q VALUES) FOR RIVER BOYNE

Year Location Station

Number Station Name 1997 2000 2003

1997 2 2000 2003

2000 1997 2000 2

2003 Upstream 1000 Derrinydaly Bridge 3 3-4 4

Downstream 1400 u/s Knightsbrook R. confl.

3 3-4 3-4

Chemical data presented in the EPA report for Water Quality in Ireland 2001 to

2003 is as follows:

TABLE 2 CHEMICAL DATA FOR RIVER BOYNE (2001 – 2003)

Parameter Concentration (mg/l)

Upstream –

Station No. 1000

Downstream

Station No. 1400

BOD 1.4

Ortho-phosphate P 0.04 0.04

Ammonia N 0.04 0.15

Oxidised nitrogen N 2.3 2

The flowrates in the River Boyne (from OPW Hydrodata) and dilution factors of

the effluent from the wastewater treatment plant are detailed below:

Table 3 Dilution Factors at 95 Percentile River Flow

River flow

95 Percentile

(m3/s)

WWTP Flow

(m3/s)

Dilution

(FRiver/FWWTP)

At dry weather flow to the WWTP 3.0 0.0313 96

At peak flow to the WWTP (3 DWF) 3.0 0.0313 32

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Table 4 Dilution Factors at Average River Flow

River flow

Average

(m3/s)

WWTP Flow

(m3/s)

Dilution

(FRiver/FWWTP)

At dry weather flow to the WWTP 17.97 0.0919 575

At peak flow to the WWTP (3 DWF) 17.97 0.0919 192

The waste assimilative capacity for BOD5 is calculated using the 95 percentile flow

as the requirement for compliance with the Urban Wastewater Treatment

Regulations only one sample in 12 can exceed the maximum value.

Compliance with nitrogen and Ortho-phosphate P requirements is based on an

annual average and therefore the average river flowrate has been used for these

calculations.

The waste assimilative capacity for BOD, ammonia, orthophosphate and oxidized

nitrogen are calculated below. There are no limits of COD or total phosphorous or

total nitrogen in terms of water quality in the salmonid regulations or bathing

water regulations.

There is a limit of suspended solids at average concentrations of 25mg/l in the

salmonid regulations. The level of suspended solids in the effluent from the

wastewater treatment plant is 35mg/l. The minimum dilution in the river at 95

percentile flow in the river and peak flows from the wastewater treatment plant is

32. The suspended solids will therefore increase by a maximum of (35/32) =

1.1mg/l. Over a daily flow the increase in suspended solids will be substantially

less and therefore the effluent limit of 35mg/l is considered acceptable.

It has been assumed that if the requirements of the Urban Wastewater Treatment

Regulations are met and the waste assimilative capacity for the other parameters

is sufficient that the effluent COD, suspended solids, total nitrogen and total

phosphorus will be acceptable.

It should be noted that the effluent flows have not been included in the WAC

calculations below and therefore there will be additional dilution to that calculated

below.

The waste assimilative capacity for the river is calculated as follows:

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Biochemical Oxygen Demand

BOD WAC = (Cmax – Cback) x F95 x 86.4

Where Cmax = max. allowable BOD concentration (mg/l) = 4 mg/L

F95 = 3.0 = 95 percentile flow in m3/sec

Cback = background BOD concentration (mg/l) = 1.4mg/L

86.4 = conversion factor (to kg/day)

BOD WAC = (4 – 1.4) x 3.0 x 86.4 = 673.9 kg.BOD5/day

This formula provides an assimilative capacity for the river of: 673.9 kgBOD5/day

Taking a design P.E. of 12,000 the influent BOD load is calculated as 720 kg

BOD/day. With an effluent BOD of 25mg/l in the wastewater treatment plant this

equates to an effluent BOD load of 67.6 kg/day. This is less than the WAC

calculated for the river and therefore acceptable.

Ortho-phosphate P

The Ortho-phosphate P loads permitted in the river are governed by the

Phosphorus Regulations (S.I. 258 of 1998). The regulations state that the

existing biological quality rating assigned between 1st January 1995 and 31st

December 1997 is the rating upon which the improvements in Water Quality will

be judged. In the case of the River Boyne the Q index was determined as Q3 in

1997 both downstream of the wastewater treatment plant.

The minimum target ratings and concentrations for these stretches of water as

defined in the Phosphorus regulations are given in Table 2 below:

TABLE 2 PHOSPHORUS REGULATIONS TARGET RATINGS AND CONCENTRATIONS

Existing Biological Quality (Q) Rating / Q Index

Minimum Target

Biological Quality (Q)

Rating /Q Index

Molybdate Reactive Phosphate Median Concentration (mg P/L)

3

3-4

3-4

4

0.05

0.03

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The chemical analysis of the river upstream and downstream of the existing

wastewater treatment plant shows the existing median ortho-phosphate P levels

to be 0.04mg/l in both cases. The high levels of phosphorus along the full stretch

of the river is likely to be due to diffuse sources such as agriculture. It is

assumed that this will be improved to achieve the target quality rating of 4, i.e.

0.03mg.P/L.

The increase in Ortho-phosphate P level due to the wastewater treatment plant is

calculated as follows:

Ortho-phosphate P WAC

The design effluent Ortho-phosphate P concentration for the upgraded

wastewater treatment plant is 2.0mg/l. The increase in river Ortho-phosphate P

concentration is calculated as follows:

Effluent MRP Concentration: 2.0 mg/L

Wastewater Treatment Plant Flowrate (Phase 1): 2,700 m3/day

Effluent MRP = (2700 x 2)/1000 = 5.40 kg/day

The river has a target Water Quality Rating of 3-4, therefore a river Ortho-

phosphate P concentration of 0.05mg/l is required. The Ortho-phosphate P

concentration upstream is assumed to improve to 0.03mg/L. The allowable

Ortho-phosphate P concentration is 0.05mg/l.

P WAC = (Cmax – Cback) x Favg x 86.4

Where Cmax = max. allowable P concentration (mg/l) = 0.05 mg/L

Favg = 17.97 = average flow in m3/sec

Cback = background P concentration (mg/l) = 0.03mg/L


P WAC = (0.05 – 0.03) x 17.97 x 86.4 = 31.1 kg P/day

The effluent Ortho-phosphate P of 5.4kg/day is less than the calculated waste

assimilative capacity of 31.1 kg/day and is therefore acceptable.

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Ammonia WAC

The median ammonia levels in the River Boyne upstream and downstream of the

existing wastewater treatment plant are 0.04mg/L and 0.03mg/L respectively.

The increase in ammonia levels without any nitrification in the wastewater

treatment plant is calculated as follows:

Maximum Effluent Ammonia Concentration: 40.0 mg/L

Wastewater Treatment Plant Flowrate: 2700 m3/day

Effluent N = (2700 x 40)/1000 = 108 kg/day

The target ammonia level in the river is taken as 0.5mg/l.

NH3 WAC = (Cmax – Cback) x Favg x 86.4

Where Cmax = max. allowable NH3 concentration (mg/l) = 0.5 mg/L


Cback = background NH3 concentration (mg/l) = 0.04mg/L


NH3 WAC = (0.5 – 0.04) x 17.97 x 86.4 = 714 kg /day

The maximum effluent ammonia of 104 kg/day is less than the calculated waste

assimilative capacity of 714 kg/day and is therefore acceptable.

Oxidised Nitrogen

The median oxidised nitrogen levels in the River Boyne upstream and

downstream of the existing wastewater treatment plant are 3.7mg/L in both

cases.

The increase in nitrate levels without any nitrification in the wastewater treatment

plant is calculated as follows:

Maximum Effluent Nitrate Concentration: 30.0 mg/L

Wastewater Treatment Plant Flowrate: 2700 m3/day

Effluent N = (2700 x 30)/1000 = 81.0 kg/day

The maximum allowable nitrate level in the river is taken as 5mg/l.

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NO3 WAC = (Cmax – Cback) x Favg x 86.4

Where Cmax = max. allowable NO3 concentration (mg/l) = 5mg/L


Cback = background NO3 concentration (mg/l) = 2.3mg/L


NO3 WAC = (5 – 2.3) x 17.97 x 86.4 = 4192 kg/day

The maximum effluent nitrate of 81 kg/day is less than the calculated waste

assimilative capacity of 4192 kg/day and is therefore acceptable.

The effluent loads to the river and the resultant increase in concentration is summarised as follows:

Parameter BOD SS P NH3 Nitrate

Effluent loads (kg/day) 67.5 94.5 5.4 108 81

Increase in river concentration (mg/l) at 95 percentile flows 0.260 0.365 0.021 0.417 0.313 Increase in river concentration (mg/l) at average flows 0.043 0.061 0.003 0.070 0.052

It should be noted that these effluent loads and increases in concentration are based on the full design load to the plant. The current effluent loads are less than this as the plant is not at full design capacity.

o Provide details of the extent and type of ground emissions at the works.

There are no groundwater emissions at the Works.

o Describe the existing environment in terms of water quality with particular reference to environmental quality standards or other legislative standards. Submit a copy of the most recent water quality management plan or catchment management plan in place for the receiving water body. Give details of any designation under any Council Directive or Regulations that apply in relation to the receiving water.

A copy of the water quality management plan is attached.

The River Boyne is designated as an SAC. This site comprises the freshwater element of the River Boyne as far as the Boyne Aqueduct, the Blackwater as far as Lough Ramor and the Boyne tributaries. It is designated as a sensitive water 6.5km downstream of the outfall from the Navan WWTP. The main channel of the River Boyne is designated as a salmonid water in SI 293 of 1988. The estuary of the River Boyne is also designated as an SAC. The impact of the discharge from the wastewater treatment works has been discussed with the National Parks and Wildlife Service and the impact was also examined in the

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Environmental Impact Statement for the scheme. The overall impact is considered to be acceptable

A site synopsis for the two SAC’s referred to above is given below:

SITE SYNOPSIS SITE NAME: RIVER BOYNE AND RIVER BLACKWATER SITE CODE: 002299

This site comprises the freshwater element of the River Boyne as far as the Boyne Aqueduct, the Blackwater as far as Lough Ramor and the Boyne tributaries including the Deel, Stoneyford and Tremblestown Rivers. These riverine stretches drain a considerable area of Meath and Westmeath and smaller areas of Cavan and Louth.

The underlying geology is Carboniferous Limestone for the most part with areas of Upper, Lower and Middle well represented. In the vicinity of Kells Silurian Quartzite is present while close to Trim are Carboniferous Shales and Sandstones. There are many large towns adjacent to but not within the site. Towns both small and large, include Slane, Navan, Kells, Trim, Athboy and Ballivor.

The site is a candidate SAC selected for alkaline fen and alluvial woodlands, both habitats listed on Annex I of the E.U. Habitats Directive. The site is also selected for the following species listed on Annex II of the same directive – Atlantic Salmon, Otter and River Lamprey.

The main areas of alkaline fen are concentrated in the vicinity of Lough Shesk, Freehan Lough and Newtown Lough. The hummocky nature of the local terrain produces frequent springs and seepages which are rich in lime. A series of base-rich marshes have developed in the poorly-drained hollows, generally linked with these three lakes. Open water is usually fringed by Bulrush (Typha latifolia), Common Club-rush (Scirpus lacustris) or Common Reed (Phragmites australis) and this last species also extends shorewards where a dense stand of Great Fen Sedge or Saw Sedge (Cladium mariscus) frequently occurs. This in turn grades into a sedge and grass community (Carex spp., Molinia caerulea) or one dominated by the Black Bogrush (Schoenus nigricans). An alternative direction for the aquatic/terrestrial transition to take is through a floating layer of vegetation. This is normally based on Bogbean (Menyanthes trifoliata) and Marsh cinquefoil (Potentilla palustris). Other species gradually become established on this cover, especially plants tolerant of low nutrient status e.g. bog mosses (Sphagnum spp.). Diversity of plant and animal life is high in the fen and the flora, includes many rarities. The plants of interest include Narrow-leaved Marsh Orchid (Dactylorhiza traunsteineri), Fen Bedstraw (Galium uliginosum), Cowbane (Cicuta virosa), Frogbit (Hydrocharis morsus-ranae) and Least Bur-reed (Sparganium minimum). These species tend to be restricted in their distribution in Ireland. Also notable is the abundance of aquatic Stoneworts (Chara spp.) which are characteristic of calcareous wetlands.

The rare plant, Round-leaved Wintergreen (Pyrola rotundifolia) occurs around Newtown Lough. This species is listed in the Red Data Book and is protected under the Flora Protection Order, 1999, and this site is its only occurrence in Co. Meath.

Wet woodland fringes many stretches of the Boyne. The Boyne River Islands are a small chain of three islands situated 2.5 km west of Drogheda. The islands were formed by the build up of alluvial sediment in this part of the river where water movement is sluggish. All of the islands are covered by dense thickets of wet, Willow (Salix spp.) woodland, with the following species occurring: Osier (S. viminalis), Crack Willow (S. fragilis), White Willow (S. alba), Purple Willow (Salix purpurea) and Grey Willow (S. cinerea). A small area of Alder (Alnus glutinosa) woodland is found on soft ground at the edge of the canal in the north-western section of the islands. Along other stretches of the rivers of the site Grey Willow scrub and pockets of wet woodland dominated by Alder have become established, particularly at the river edge of mature deciduous woodland. Ash (Fraxinus excelsior) and Birch (Betula pubescens) are common in the latter and the ground flora is typical of wet woodland with Meadowsweet (Filipendula ulmaria), Angelica (Angelica sylvestris), Yellow Iris, Horsetail (Equisetum spp.) and occasional tussocks of Greater Tussocksedge (Carex paniculata).

The dominant habitat along the edges of the river is freshwater marsh - the following plant species occur commonly here: Yellow Flag (Iris pseudacorus), Creeping Bent (Agrostis stolonifera), Canary

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Reed-grass (Phalaris arundinacea), Marsh Bedstraw (Galium palustre), Water Mint (Mentha aquatica) and Water Forget-me-not (Myosotis scorpioides). In the wetter areas of the marsh Common Meadow-rue (Thalictrum flavum) is found. In the vicinity of Dowth, Fen Bedstraw (Galium uliginosum), a scarce species mainly confined to marshy areas in the midlands, is common in this vegetation. Swamp Meadow-grass (Poa palustris) is an introduced plant which has spread into the wild (naturalised) along the Boyne approximately 5 km south-west of Slane. It is a rare species which is listed in the Red Data Book and has been recorded among freshwater marsh vegetation on the banks of the Boyne in this site. The only other record for this species in the Republic is from a site in Co. Monaghan.

The secondary habitat associated with the marsh is wet grassland and species such as Tall Fescue (Festuca arundinacea), Silverweed (Potentilla anserina), Creeping Buttercup (Ranunculus repens), Meadowsweet (Filipendula ulmaria) and Meadow Vetchling (Lathyrus pratensis) are well represented. Strawberry Clover (Trifolium fragiferum), a plant generally restricted to coastal locations in Ireland, has been recorded from wet grassland vegetation at Trim. At Rossnaree river bank on the River Boyne, is Round-Fruited Rush (Juncus compressus) found in alluvial pasture, which is generally periodically flooded during the winter months. This rare plant is only found in three counties in Ireland.

Along much of the Boyne and along tributary stretches are areas of mature deciduous woodland on the steeper slopes above the floodplain marsh or wet woodland vegetation. Many of these are planted in origin. However the steeper areas of King Williams Glen and Townley Hall wood have been left unmanaged and now have a more natural character. East of Curley Hole the woodland has a natural appearance with few conifers. Broad-leaved species include Oak (Quercus spp.), Ash (Fraxinus excelsior), Willows, Hazel (Corylus avellana), Sycamore (Acer pseudoplatanus), Holly (Ilex aquifolium), Horse chestnut (Aesculus sp.) and the shrubs Hawthorn (Crataegus monogyna), Blackthorn (Prunus spinosa) and Elder (Sambucus nigra).

South-west of Slane and in Dowth, the addition of some more exotic tree species such as Wych Elm (Ulmus glabra), Beech (Fagus sylvatica), and occasionally Lime (Tilia cordata), are seen. Coniferous trees, Larch (Larix sp.) and Scots Pine (Pinus sylvestris) also occur. The woodland ground flora includes Barren Strawberry (Potentilla sterilis), Enchanter’s Nightshade (Circaea lutetiana) and Ground-ivy (Glechoma hederacea), along with a range of ferns. Variation occurs in the composition of the canopy, for example, in wet patches alongside the river, White Willow and Alder form the canopy.

Other habitats present along the Boyne and Blackwater include lowland dry grassland, improved grassland, reedswamp, weedy wasteground areas, scrub, hedge, drainage ditches and canal. In the vicinity of Lough Shesk, the dry slopes of the morainic hummocks support grassland vegetation which, in some places, is partially colonized by Gorse (Ulex europaeus) scrub. Those grasslands which remain unimproved for pasture are species-rich with Common Knapweed (Centaurea nigra), Creeping Thistle (Cirsium arvense) and Ribwort Plantain (Plantago lanceolata) commonly present.

Fringing the canal alongside the Boyne south-west of Slane, are Reed Sweet-grass (Glyceria maxima), Great Willowherb (Epilobium hirsutum) and Meadowsweet.

The Boyne and its tributaries is one of Ireland’s premier game fisheries and it offers a wide range of angling from fishing for spring salmon and grilse to seatrout fishing and extensive brown trout fishing. Atlantic Salmon (Salmo salar) use the tributaries and headwaters as spawning grounds. Although this species is still fished commercially in Ireland, it is considered to be endangered or locally threatened elsewhere in Europe and is listed on Annex II of the Habitats Directive. Atlantic Salmon run the Boyne almost every month of the year. The Boyne is most important as it represents an eastern river which holds large three-sea-winter fish from 20 –30 lb. These fish generally arrive in February with smaller spring fish (10 lb) arriving in April/May.

The grilse come in July, water permitting. The river gets a further run of fish in late August and this run would appear to last well after the fishing season. The salmon fishing season lasts from 1st March to 30th September.

The Blackwater is a medium sized limestone river which is still recovering from the effects of the arterial drainage scheme of the 70’s. Salmon stocks have not recovered to the numbers pre drainage. The Deel, Riverstown, Stoneyford and Tremblestown Rivers are all spring fed with a continuous high volume of water. They are difficult to fish in that some are overgrown while others have been affected by drainage with the resulting high banks.

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The site is also important for the populations of two other species listed on Annex II of the E.U. Habitats Directive, namely River Lamprey (Lampetra fluviatilis) which is present in the lower reaches of the Boyne River while the Otter (Lutra lutra) can be found throughout the site. In addition, the site also supports many more of the mammal species occurring in Ireland. Those which are listed in the Irish Red Data Book include Pine Marten, Badger and Irish Hare. Common Frog, another Red Data Book species, also occurs within the site. All of these animals with the addition of the Stoat and Red Squirrel, which also occur within the site, are protected under the Wildlife Act.

Whooper Swans winter regularly at several locations along the Boyne and Blackwater Rivers. Parts of these areas are within the cSAC site. Known sites are at Newgrange (c. 20 in recent winters), near Slane (20+ in recent winters), Wilkinstown (several records of 100+) and River Blackwater from Kells to Navan (104 at Kells in winter 1996/97, 182 at Headfort in winter 1997/98, 200-300 in winter 1999/00). The available information indicates that there is a regular wintering population of Whooper Swans based along the Boyne and Blackwater River valleys. The birds use a range of feeding sites but roosting sites are not well known. The population is substantial, certainly of national, and at times international, importance. Numbers are probably in the low hundreds.

Intensive agriculture is the main landuse along the site. Much of the grassland is in very large fields and is improved. Silage harvesting is carried out. The spreading of slurry and fertiliser poses a threat to the water quality of this salmonid river and to the lakes. In the more extensive agricultural areas sheep grazing is carried out.

Fishing is a main tourist attraction on the Boyne and Blackwater and there are a number of Angler Associations, some with a number of beats. Fishing stands and styles have been erected in places. The Eastern Regional Fishery Board have erected fencing along selected stretches of the river as part of their salmonid enhancement programme. Parts of the river system have been arterially dredged. In 1969 an arterial dredging scheme commenced and disrupted angling for 18 years. The dredging altered the character of the river completely and resulted in many cases in leaving very high banks. The main channel from Drogheda upstream to Navan was left untouched, as were a few stretches on the Blackwater. Ongoing maintenance dredging is carried out along stretches of the river system where the gradient is low.

This is extremely destructive to salmonid habitat in the area. Drainage of the adjacent river systems also impacts on the many small wetland areas throughout the site. The River Boyne is a designated Salmonid Water under the EU Freshwater Fish Directive.

The site supports populations of several species listed on Annex II of the EU Habitats Directive, and habitats listed on Annex I of this directive, as well as examples of other important habitats. Although the wet woodland areas appear small there are few similar examples of this type of alluvial wet woodland remaining in the country, particularly in the north-east. The semi-natural habitats, particularly the strips of woodland which extend along the river banks and the marsh and wet grasslands, increase the overall habitat diversity and add to the ecological value of the site as does the presence of a range of Red Data Book plant and animal species and the presence of nationally rare plant species.

19.06.2003

SITE SYNOPSIS SITE NAME: BOYNE COAST AND ESTUARY SITE CODE: 001957 Boyne Coast and Estuary is a coastal site which includes most of the tidal sections of the River Boyne, intertidal sand and mud flats, salt marshes, marginal grassland, and the stretch of coast from Bettystown to Termonfeckin that includes the Mornington and Baltray sand dune systems.

The Boyne River channel, which is navigable and dredged, is defined by training walls, these being breached in places. Intertidal flats occur on the sides of the channelled river. The sediments vary from fine muds in the sheltered areas to sandy muds or sands towards the river mouth. The linear

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stretches of intertidal flats to the north and south of the river mouth are mainly composed of sand. One or more species of Eelgrass (Zostera spp.) occur in the estuary.

Parts of the intertidal areas are fringed by salt marshes, most of which are of the Atlantic type, and dominated by Sea-purslane (Halimione portulacoides). Other species present include Common Saltmarsh-grass (Puccinellia maritima), Sea Plantain (Plantago maritima), Lax-flowered Sea-lavender (Limonium humile) and Glasswort (Salicornia spp.). Common Cord-grass (Spartina anglica) occurs frequently on the flats and salt marshes.

The two sand dune systems in the site, at Baltray and Mornington, are of conservation value, despite the restricted distribution of the intact areas and the high recreational pressure to which they are subjected. A gradient from embryonic dunes to Marram dunes and then fixed dunes is shown at both systems. The embryonic dunes are particularly well-developed at Baltray where there is active accretion. Species present include Sand Couch (Elymus farctus), Lyme-grass (Leymus arenarius), Marram, (Ammophila arenaria), Sea Sandwort (Honkenya peploides) and Prickly Saltwort (Salsola kali). The embryonic dunes grade into a narrow band of shifting Marram dunes. Marram is dominant, though there are also such species as Cat’s-ear (Hypochoeris radicata), Mouse-ear Hawkweed (Hieracium pilosella) and Dandelion (Taraxacum officinale). The areas of fixed dunes on the site have a typical diversity of species, including Marram, Red Fescue (Festuca rubra), Wild Carrot (Daucus carota), Common Bird’s-foot-trefoil (Lotus corniculatus), Common Restharrow (Ononis repens), Wild Thyme (Thymus praecox), Lady’s Bedstraw (Galium verum) and Wild Pansy (Viola tricolor). Vegetation dominated by bryophytes and lichens is limited, though such species as Brachythecium albicans, Hypnum cupressiforme, Peltigera canina and Cladonia spp. occur. Some dune slacks may still occur at the site. A number of scarce plants such as Viper’s-bugloss (Echium vulgare), Adder’stongue (Ophioglossum vulgatum), Variegated Horsetail (Equisetum variegatum) and Wild Sage (Salvia verbenaca) have been recorded from the site in the past. The lastnamed species is of particular note as it is a Red Data Book species at its most northerly known Irish station.

The site supports a population of the rare snail, Helix pisana, in Ireland known only from the coast between counties Louth and Dublin. The Boyne is the second most important estuary for wintering birds on the Louth-Meath coastline. From a recent wetland survey carried out over 4 seasons (1994/95-97/98), it is known that this site supports nationally important numbers of Shelduck (176 individuals), Golden Plover (5,338), Lapwing (4,755), Knot (1,559), Black-tailed Godwit (414), Redshank (539), Turnstone (104), Oystercatcher (922), Grey Plover (112) and Sanderling (93).

Other species of regional or local importance include Brent Goose (142), Wigeon (485), Teal (185), Mallard (160), Dunlin (627), Curlew (352) and Ringed Plover (c. 100). An area of shingle at Baltray Dunes is also an important breeding site for Little Tern, with 14 pairs recorded in 1995. Little Tern is the rarest Irish tern species, and is listed on Annex I of the E.U. Birds Directive. Part of the estuary is a Wildfowl Sanctuary and has been designated a Special Protection Area under the E.U. Birds Directive.

In general the site has been somewhat modified by human activities. The river is regularly dredged to accommodate cargo ships, which can cause disturbance to the bird, fish and invertebrate communities in the estuary. Several factories operate upstream from the estuary and pollution and disturbance associated with them has had an impact on the ecology of the area. There is a proposal to create a deep water facility at the north end of Mornington Dunes on the mouth of the Boyne estuary. The site is of considerable conservation as a coastal complex that supports good examples of eight habitats that are listed on Annex I of the E.U. Habitats Directive (estuaries, tidal mudflats, Salicornia mud, Atlantic salt meadows, Mediterranean salt meadows, embryonic shifting dunes, Marram dunes and fixed dunes) and for the important bird populations that it supports.

2.10.2001

o Provide a statement as to whether or not emissions of main polluting

substances (as defined in the Dangerous Substances Regulations S.I. No. 12 of 2001) to water are likely to impair the environment.

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The level of dangerous substances both in the effluent and in the River Boyne as detailed in Tables D1 and Tables F1 show a level below that in S.I. No. 12 of 2001 and therefore the emissions are not considered likely to impair the environment.

o In circumstances where water abstraction points exist downstream of

any discharge describe measures to be undertaken to ensure that discharges from the waste water works will not have a significant effect on faecal coliform, salmonella and protozoan pathogen numbers, e.g., Cryptosporidium and Giardia, in the receiving water environment.

There are drinking water abstractions from the River Boyne downstream of the discharge from the wastewater treatment plant at Kilcairn (6km downstream). There is an additional water abstraction in the River Boyne at East Meath. This is approximately 27km downstream of the outfall from Trim.

Details of these water abstractions are included in Table F2.

o Indicate whether or not emissions from the agglomeration or any plant, methods, processes, operating procedures or other factors which affect such emissions are likely to have a significant effect on – (a) a site (until the adoption, in respect of the site, of a decision by the European

Commission under Article 21 of Council Directive 92/43/EEC for the purposes of the third paragraph of Article 4(2) of that Directive) —

(b) a site adopted by the European Commission as a site of Community importance for

the purposes of Article 4(2) of Council Directive 92/43/EEC1 in accordance with the procedures laid down in Article 21 of that Directive,

(c) a special area of conservation within the meaning of the Natural Habitats

Regulations, or (d) an area classified pursuant to Article 4(1) or 4(2) of Council Directive 79/409/EEC2; The River Boyne and River Blackwater (Kells) is designated as an SAC. This site comprises the freshwater element of the River Boyne as far as the Boyne Aqueduct, the Blackwater as far as Lough Ramor and the Boyne tributaries. It is designated as a sensitive water downstream of Navan. The estuary of the River Boyne is also designated as an SAC. Details of the SAC’s are given above. The impact of the discharge from the wastewater treatment works has been discussed with the National Parks and Wildlife Service and the impact was also examined in the Environmental Impact Statement for the scheme. The overall impact is considered to be acceptable.

o Describe, where appropriate, measures for minimising pollution over long distances or in the territory of other states.

The impact of the discharge from the wastewater treatment plant in Trim has been calculated in the Waste Assimilative Capacity calculations above. This shows that the impact of the discharge can be assimilated into the river and will not have a pollution effect over long distances.

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o This section should also contain full details of any modelling of discharges from the agglomeration. Full details of the assessment and any other erelevant information on the receiving environment should be submitted as Attachment F.1.

No modeling of the discharge to the River Boyne has been carried out. However, the impact of the discharge from the wastewater treatment plant in Trim has been calculated in the Waste Assimilative Capacity calculations above.

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ATTACHMENT No: F2

Drinking Water Abstraction Point(s)

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Trim WWTW - Table F2ABS_CD AGG_SERVED ABS_VOL PT_CD DIS_DS EASTING NORTHING VERIFIED

Y = GPS usedN = GPS not used

KILCARN WTP (Trim WWTP – Kilcarn Abstraction)

Navan – Mid Meath Supply code: 2300PUB1016

14000

Y

6E-digit GPS Irish National Grid

6N-digit GPS Irish National Grid

4970 2000 Kilcairn Water Abstraction Point.

288653 265175

Abstraction Code

Agglomeration served

Abstraction Volume in m3/day

Point Code Provide label ID’s

Distance Downstream in meters from Emission Point to Abstraction Point

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ATTACHMENT No: G1

Compliance with Council Directives - Programme of

Improvement

(Approved funding and a timeframe for completion)

Not applicable – current plant is considered to be in compliance with all Council Directives

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ATTACHMENT No: G2

Compliance with Water Quality Standards for

Phosphorus Regulations - Programme of

Improvement

(Approved funding and documentation)

Not applicable – current plant is considered to be in compliance with the Phosphorus Regulations

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ATTACHMENT No: G3

Impact Mitigation - Programme of Improvement


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ATTACHMENT No: G4

Stormwater Overflow - Programme of Improvement

(Approved funding and a timeframe for completion)


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attachment no: c.1 operational information ...storm tank dimensions length: 21m width: 5m depth of...

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