Rattlechain Improvement Works - WhatDoTheyKnow · 2020-01-18 · Rattlechain Improvement Works Rattlechain Lagoon, Oldbury Draft - Information for ... 2nd Floor, Exchequer Crt, 33

Rattlechain Improvement Works

Rattlechain Lagoon, Oldbury

Draft - Information for Environment Agency

July 2012

www.erm.com

Environmental Resources Management Limited Incorporated in the United Kingdom with registration number 1014622 Registered Office: 2nd Floor, Exchequer Crt, 33 St Mary Axe, London, EC3A 8AA

Rhodia

Rattlechain Improvement Works: Rattlechain Lagoon, Oldbury

July 2012

Prepared by: Phillip Necrews

For and on behalf of Environmental Resources Management Approved by: Stephen Matthews

Signed: Position: Partner Date: 22nd June 2012

This report has been prepared by Environmental Resources Management the trading name of Environmental Resources Management Limited, with all reasonable skill, care and diligence within the terms of the Contract with the client, incorporating our General Terms and Conditions of Business and taking account of the resources devoted to it by agreement with the client. We disclaim any responsibility to the client and others in respect of any matters outside the scope of the above. This report is confidential to the client and we accept no responsibility of whatsoever nature to third parties to whom this report, or any part thereof, is made known. Any such party relies on the report at their own risk.

CONTENTS

1 INTRODUCTION 1

1.1 BACKGROUND 1 1.2 REPORT STRUCTURE 1

2 POLLUTION CONTROL SYSTEMS AT RATTLECHAIN 2

2.1 CURRENT SITUATION 2 2.2 REMEDIAL WORKS AT RATTLECHAIN LAGOON 2 2.3 IMPACT ON EXISTING PROTECTION MEASURES 3 2.4 PROPOSED AFTER-USE & VISUAL APPEARANCE 3

3 OVERVIEW OF IMPLEMENTATION 4

3.1 LEVELLING OF SEDIMENTS 4 3.2 GEOTEXTILE MEMBRANE 5 3.3 COVER LAYER 5 3.4 CAUSEWAY 6 3.5 DISCHARGE TO CANAL 6 3.6 SMALL LAGOON SEDIMENTS 6 3.7 MATERIALS 6 3.8 ACCEPTANCE CRITERIA & TESTING 7

4 ENVIRONMENTAL CONTROLS (DURING WORKS) 8

4.1 BOUNDARY MONITORING 8 4.2 WORKING HOURS 9 4.3 TRAFFIC MANAGEMENT 9 4.4 USE OF CHEMICALS 9

5 AFTERCARE & ENVIRONMENTAL MONITORING (POST-WORKS) 11

5.1 AFTERCARE REQUIREMENTS OF CAP 11 5.2 ENVIRONMENTAL MONITORING REGIME 11

ENVIRONMENTAL RESOURCES MANAGEMENT RHODIA

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1 INTRODUCTION

Environmental Resources Management (ERM) has been commissioned by Rhodia UK Limited (Rhodia) to produce this document setting out the proposed improvement works at the Rattlechain Lagoon site. The site is located approximately 2.5km northwest of Oldbury, and a site location plan is presented in Figure 1.

1.1 BACKGROUND

The site historically operated under a waste management licence for the deposition of neutralised wastes containing calcium phosphate and, phosphorus plant from the nearby Rhodia Oldbury plant. Wastes ceased to be deposited in the lagoon in 2004. The proposed remediation is perhaps unique within the UK in that it involves the installation of a geotextile and capping layer below a water body to provide a barrier between the underlying sediments and the water above. However, specialist contractor will be employed to do the works that has experience utilising this technique in Europe. This would serve to mitigate ecosystem risks, specifically to wild fowl that might use the lagoon.

1.2 REPORT STRUCTURE

The remainder of this report is structured as follows:- Section 2: presents the current pollution controls at the site; Section 3: presents an overview of the implementation of the remedial design; Section 4: presents the environmental controls during the works; Section 5: presents aftercare and environmental monitoring (post works) Figures

Figure 1 – Site Location Plan Figure 2 - Visual Appearance of Lagoon – Post Works Figure 3a – Plan View of Current Condition Figures 3b - Cross Sections through lagoon – Current Condition Figure 4a – Plan view – Post Works Figures 4b - Cross Sections through lagoon – Post Works Figure 5 – Noise Management Figure 6 – Environmental Monitoring Post Works Annexes Annex A – Material Safety Data Sheets


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2 POLLUTION CONTROL SYSTEMS AT RATTLECHAIN

2.1 CURRENT SITUATION

At present the lagoon only receives rainwater and there are no direct inputs into the lagoon. Inspections are undertaken at the lagoon regularly and the observations are recorded by Rhodia.

2.1.1 Protection of Surface Water (Canal)

Surface water levels in the lagoon are controlled via a manually operated pump, and other than via evaporation, this is the only way that significant volumes of water can leave the lagoon. The water within the lagoon is pumped from the small lagoon and discharged via a consented discharge to the canal. The causeway between the main lagoon and the smaller lagoon was designed to act as a filter system and also remove particulate matter from the water. The consent limits for the discharge waters into the canal during and post-works will remain the same as those in place at present.

2.1.2 Hydrogeological Impacts

The lagoon in underlain by Etruria Marl, it is understood that this deposit extends to a depth of approximately 120m. This has been classified by the Environment Agency (EA) as a Secondary A aquifer. A regulatory search in 2010 stated that there were no registered groundwater abstractions within 1km of the site.

2.1.3 Material Stability

It should be acknowledged that the presence of a body of water on the lagoon over the sediment is an important control in ensuring that any ‘tramp’ phosphorus residues are unable to combust. This has driven the selection of remedial technique.

2.2 REMEDIAL WORKS AT RATTLECHAIN LAGOON

As mentioned above, the intention is to provide some supplementary protection for the waste site in relation to wildfowl. The work will involve the installation of a sand cap which will prevent wildfowl from ingesting waste materials from the lagoon, or plants that might be rooted in these sediments. The cap has a design thickness of 400mm with a tolerance of 100mm. The basis for this design is that the maximum aquatic plant rooting depth (from published sources) is 200mm. The cap thickness therefore promotes a suitable


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factor of safety and should prevent the waste material being ingested via wildfowl ‘grubbing up’ aquatic plants and ingesting sediment.

2.3 IMPACT ON EXISTING PROTECTION MEASURES

All existing protection measures at the lagoon, such as water level control measures, will be unchanged as a result of these works.

2.4 PROPOSED AFTER-USE & VISUAL APPEARANCE

Following completion of the remedial works the lagoon will remain as it is at present i.e. an historical landfill site. The site will also remain secured, via a 2.5 metre palisade fence, topped with barbed wire. Figure 2 presents the proposed visual appearance of the lagoon, post-remedial works, and the details with regards to the implementation of the remediation are provided in Section 3.0, below.


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3 OVERVIEW OF IMPLEMENTATION

This section of the document provides an overview of the remedial design to be implemented at the site. The remedial solution will involve the following works: Levelling of the lagoon sediments;

Installation of geotextile membrane on the sediment surface;

Installation of a ‘capping’ layer on the top of the geotextile membrane for

protection from diving wildfowl; Re-profiling the causeway and small lagoon; and

Removal of discharge pipe into main lagoon.

3.1 LEVELLING OF SEDIMENTS

As stated above, prior to the installation of the geotextile and capping layer, the sediment will be re-profiled to create a horizontal uniform surface on to which a geotextile and capping layer will be installed. The sediments will be re-profiled using a specialist small cutting dredging vessel, which uses a vacuum pump to draw the sediment to the surface and transfer this to the spraying pontoon that undertakes the hydraulic filling. Throughout this process the sediments will remain fully hydrated. Figures 3a and 3b present a plan view of the levels of sediment within the lagoon in their present condition along with cross sections through the lagoon.

3.1.1 Temporary Harbour

A temporary harbour is required to be formed on the western edge of the lagoon. The harbour will comprise a temporary sheet-piled wall being installed to form a quay. It is proposed that the sheet-piled wall will be removed after the completion of the works, the geotextile and cover layer will then be installed in the area.

3.1.2 Metallic Obstructions

Metallic obstructions, such as drums, have been identified within the lagoon during a geophysical survey. Objects within the top 3m of the sediment, in areas where dredging is proposed, will be removed to avoid damage to the


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machinery. The removed objects will be moved to deeper areas of the lagoon, where sediment will be placed during the process of re-profiling works.

3.2 GEOTEXTILE MEMBRANE

A single geotextile membrane will be formed by a process of sewing together pre-formed sections. The single membrane will be formed over the lagoon and sunk to cover the re-profiled sediments. This approach has been used previously in Europe by the specialist contractor employed to do the works.

3.2.1 Launching Area

Along the southern shore of the lagoon a lowered area will be formed as an area for the launching of the geotextile. The launching area will have approximate dimensions of 100 by 10m. The launching area will be formed of site-won material (see Section 3.8 below), and will be covered with sand so as to not damage the geotextile during preparatory works. On completion of the works, the sand will be removed and this will be re-used on site to cover the geotextile on the edges of the lagoon. A layer of topsoil will also be placed over the former launching area to enable natural vegetation regeneration.

3.2.2 Anchoring Geotextile Membrane & Finishing

The geotextile membrane is required to be anchored to the banks of the lagoon. To do this a ‘U-shaped’ channel will be excavated, into which the edge of the geotextile membrane will be placed; the channel will then be backfilled. An access track will be constructed using clean inert material around the perimeter of the lagoon for use during remedial works. The track will be constructed on top of the anchoring channel discussed above, and will have a minimum width of 3m to allow sufficient access throughout remediation. The geotextile membrane exposed on the banks of the lagoon will be covered to protect the membrane from excessive exposure to sunlight. This will also serve to improve the aesthetics of the lagoon margins.

3.3 COVER LAYER

The cover layer will be placed on top of the geotextile using a spraying pontoon that moves very slowly over the entire lagoon area. The placement will be completed in two phases, with sonar surveys to monitor the thickness of the material placed along with the underwater surface. It is proposed that the final thickness of the cover layer will be 400mm.


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Figure 4a presents a plan view of the proposed levels post-works. Figure 4b shows the proposed cross-sections of the lagoon following completion.

3.4 CAUSEWAY

A causeway is present at the site and separates the larger, eastern lagoon, from the smaller, western lagoon. As part of the remedial works, it is proposed that the causeway will be reinforced to account for the potential increased loads acting on the causeway as a result of the levelling of the sediment in the main lagoon. It is proposed that the widening of the causeway in completed on the western edge, as shown on Figure 2.

3.5 DISCHARGE TO CANAL

At present, the pipeline that discharges water to the canal to the north of the site runs along the causeway. This is required to be diverted to allow the causeway to be reinforced and the access road to be constructed. The revised route will be around the western edge of the smaller lagoon. The ultimate discharge point into the canal will remain the same. Figure 2 presents the proposed revised route for the discharge pipeline.

3.6 SMALL LAGOON SEDIMENTS

A limited amount of potentially contaminated sediments have been noted within the western lagoon. The volume of these sediments is, however, significantly less than that in the main lagoon. It is not proposed to install a geotextile membrane in this lagoon. Sediment will instead be removed, as far as practicably possible, and placed in the main lagoon in areas where deposition of sediments is planned. Sediments will be removed utilising the same methodology used to re-profile the main lagoon.

3.7 MATERIALS

The following sections provide details of the materials planned to be utilised during the remedial works.

3.7.1 Site-Won

Site-won materials will be sourced from the excavations of inert material at the site outside of the lagoon.

3.7.2 Imported – Cover Layer

It is proposed that imported clean material will be used to form the cover layer above the geotextile. The imported material will be a sand based


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material with no gravel component to mitigate against damage to the underlying geotextile.

3.7.3 Imported – Causeway

Imported material is also required for reinforcement of the causeway. It is proposed that the imported material will be composed of natural coarse stone or crushed inert debris and concrete material (20 to 75mm sizing).

3.8 ACCEPTANCE CRITERIA & TESTING

Materials utilised on site (both site won and imported) with be assessed prior to their use. The assessment will ensure that the materials are inert and ‘fit for purpose’. Records of the materials brought onto site will be retained after the completion of the works. The final levels within the lagoon will be confirmed by a survey which will be completed upon completion of the remediation.


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4 ENVIRONMENTAL CONTROLS (DURING WORKS)

This section provides details of the environmental controls planned to be implemented throughout the course of the remedial works at the site.

4.1 BOUNDARY MONITORING

Fixed monitoring points will be created at locations along the boundary of the site. The monitoring points will be weighted towards the most sensitive receptors (residential housing). The following will be monitored during the works: Noise; Odours; and Phosphine Gas.

Data obtained will be recorded throughout the programme of works. The sections below provide details on the parameters to be monitored at each location. The monitoring locations will be set up prior to commencement of site works, based on accessibility and proximity to receptors. At present it is proposed that the majority of the monitoring locations will be set-up in the strip of land between the lagoon and the residential housing to the south of the site.

4.1.1 Noise

It is anticipated there will be limited impact to local residents from noise throughout the remedial works. Noise levels are likely to be elevated compared to general site operations during the dredging operations. The table below provides a summary of the predicted noise levels generated by the dredging equipment; these have been calculated by the contractor operating the machinery. For the purpose of the assessment the machinery has been considered to be 30m away from housing.

Table 4.1 Noise Levels at 30m

Motor speed ( RPM) dB(A) 750 50.3 1,000 52.3 1,250 54.8 1,500 57.9 1,750 58.6 1,950 (maximum) 61.4

Figure 5 presents the proposed arrangements for mitigating noise levels during dredging operations. The figure shows a buffer of 30m from the housing, to mitigate any potential noise issues during the work it is proposed that no dredging occurs within 60m of the residential housing outside of the


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hours of 0800 and 1615. It should be noted that re-profiling of the lagoon, of which dredging is only a component, only accounts for ~30% of the total days of site works, a proposed 51 days. Notwithstanding the above, daily noise monitoring will be undertaken at the aforementioned boundary monitoring points.

4.1.2 Odours

It is considered that the only source of odours during the works will be that from the exhausts of site machinery. Monitoring will be undertaken on a daily basis at a frequency defined based on the work activities on a given day.

4.1.3 Phosphine Gas

During dredging operations the presence of phosphine gas will be measured at monitoring locations down-gradient of works; wind direction will be determined by special flags to be installed at the site. If levels exceed MAC (Maximum Allowed Concentration) for phosphine, work will be stopped immediately and will continue to be monitored until levels falls back below MAC.

4.2 WORKING HOURS

Working hours for the remedial works will be 0700 until 2000 Monday to Friday with reduced hours on Saturday and Sunday. As discussed in Section 4.1.1, above, no dredging works will be undertaken within 60m of residential properties outside the hours of 0800 and 1615.

4.3 TRAFFIC MANAGEMENT

The only site access is along John’s Lane. This is a single track road that exits onto a housing estate. A traffic management plan will be implemented to ensure the delivery of materials are scheduled so that traffic does not need to back up either along John’s Lane or on the housing estate. A traffic co-ordinator will be appointed to manage the process of delivery vehicles entering the site to minimise any disturbance to local residents.

4.4 USE OF CHEMICALS

Due to the fine grain size of the sediment the addition of environmental friendly, water based, polymers is necessary to facilitate the settling of the sediment and suspended materials. The polymer to be used for these works is a water based anionic polyelectrolyte called Magnafloc 338; a datasheet for this is provided in Annex A. The key factors are that this poly-electrolyte:


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Provides stable clarification conditions for removing maximum suspended and dissolved solids;

Performs over a wide pH range with or without the use of organic and inorganic coagulants;

Effectively decreases BOD/COD levels in clarified process effluent

streams; and Contains no VOC or surfactant components to harm the environment.


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5 AFTERCARE & ENVIRONMENTAL MONITORING (POST-WORKS)

5.1 AFTERCARE REQUIREMENTS OF CAP

Following the completion of the remedial works, the following monitoring works will be completed on an annual basis: Walkover to assess lagoon condition; and

Side scan sonar to monitor the thickness of the capping, with a grid

spacing of 2m. An Operation & Maintenance (O&M) manual will be produced for use throughout the life of the lagoon in its post-remediation condition. The following key elements will be contained with the O&M manual: Type, use and protocols for operation of small shallow draft craft on the

lagoon;

Other procedures for works on banks and in the vicinity of the lagoon;

Procedures for emergency operations on or in the vicinity of the lagoon e.g. Fire;

Record keeping related to lagoon visits / activities by Rhodia personnel;

Operation / control of water levels including volumes pumped and discharged to the canal;

Maintenance of fence and other equipment at the lagoon;

Reporting to ERM of any unforeseen events e.g. abnormal weather conditions such as severe storms, prolonged drought or seismic activity;

Protocol for liaison regarding any changes in use of the Lagoon or access; and

Agreement on the process for updating the O&M manual.

5.2 ENVIRONMENTAL MONITORING REGIME

Routine monitoring is undertaken at the site comprising ground and surface water sampling. This will continue after the completion of the remedial works, on the same timing schedule as at present. The following sections provide information on monitoring groundwater and surface waters.


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5.2.1 Groundwater

Current monitoring arrangements will continue with groundwater samples being collected from five wells around the perimeter of the site at the current frequency. The locations of these wells are shown on Figure 6. The following analysis will be undertaken on groundwater samples: Traditionals (pH, alkalinity, total suspended solids, and total dissolved

solids);

Organics (total organic carbon, chemical oxygen demand, acetyldehyde, speciated phenols, methanol, toluene, carbon tetrachloride, and chloroform);

Inorganics (Al, As, Cd, Ca, Cr, Cu, Fe, Pb, Mn, Hg, Ni, Zn, Cyanide, and

Elemental phosphorous); and Dissolved Ions (Ammonium, Chloride, Flouride, Magnesium, Nitrate,

Phosphate, Potassium, Sodium, Sulphate, Sulphide, Elemental Sulphur, and Ammoniacal Nitrogen).

5.2.2 Surface Water

Surface water samples will be collected from both the main lagoon and the smaller western lagoon (two lagoon samples in total). As per the requirements of the consented discharge to the canal samples will be collected as part of the routine monitoring at the site.

SITE LOCATION

DRAWN: MTCCHECKED: PNAPPROVED: SM

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Figure 1Site Location Plan, Rattlechain Lagoon,Birmingham, UK

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Path: T:\GIS Project\0165630RattlechainGIS_JL_PN\MAPS\0165630_SiteLocation_A01.mxdSOURCE: Reproduced from Ordnance Survey digital map data. © Crowncopyright, All rights reserved. 2011 License number 0100031673.

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Figure 2Post Works Layout Plan

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Site BoundaryExisting Pumping StationLowered Area Created to Prepare GeotextileLaunching Harbour6m Wide CausewayExisting Discharge Route to CanalPost-Remediation Discharge Route to Canal

DATE: 12/06/2012


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Figure 3a Pre Works Lagoon

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Figure 3b Pre Works Cross Sections

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11 123.00123.00

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Figure 4aPost Works Lagoon

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Figure 4b Post Works Cross Sections

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Figure 5Noise Management

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Site Boundary30m from Residential60m from ResidentialApproximate Extent of Shallow SedimentNo Dredging Operations will be Undertaken Outside of 0800 - 1615 (60m)

DATE: 22/06/2012


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Figure 6Environmental Monitoring - Post Works

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Path: T:\GIS Project\0165630RattlechainGIS_JL_PN\MAPS\0165630_MonitoringLocations_A02.mxdSOURCE: Reproduced from Ordnance Survey digital map data. © Crowncopyright, All rights reserved. 2012 License number 0100031673.

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Site Boundary!Ò< Monitoring Well

DATE: 02/07/2012


Annex A

Material Safety Data Sheets

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Rattlechain Improvement Works - WhatDoTheyKnow · 2020-01-18 · Rattlechain Improvement Works Rattlechain Lagoon, Oldbury Draft - Information for ... 2nd Floor, Exchequer Crt, 33