ARC Enviromental Report Marine Walk Installation of combined gas / groundwater monitoring wells accompanied by frequent monitoring visits

8/13/2019 ARC Enviromental Report Marine Walk Installation of combined gas / groundwater monitoring wells accompanied by frequent monitoring visits.

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repared By:

arren McGrath

ate: 30/09/2013

pproved By:

ark Berriman

t 30/09/2013

PHASE 1: DESK TOP STUDY REPORT

BBL NE LTD

PROPOSED REDEVELOPMENT

LAND OFF MARINE WALK

ROKER

SUNDERLAND

SR6 0PL

Solum House1 Elliott CourtSt Johns RoadMeadowfieldDurhamDH1 5TS

Tel: (0191) 378 6380Fax: (0191) 378 0494

e-mail: [email protected]

Project No: 13-574


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CONTENTS

1.0 INTRODUCTION Page 3

2.0 PHYSICAL SETTING Page 3

2.1 Site Details Page 3

3.0 ENVIRONMENTAL SETTING Page 3

3.1 Site Geology Page 3 3.2 Coal Mining Assessment Page 4 3.3 Site Hydrogeology Page 4 3.4 Site Hydrology Page 5 3.5 Site Ecology Page 5 3.6 Radon Assessment Page 5 3.7 Estimated Soil Chemistry Page 5

4.0 INDUSTRIAL SETTING Page 54.1 Recent Site History Page 5

4.2 Landfill & Waste Page 6 4.3 Statutory Requirements / Authorisations Page 7 4.4 Pollution Incidents and Discharge Consents Page 7

5.0 CONCEPTUAL SITE MODEL Page 7

5.1 Geotechnical Considerations Page 8 5.2 Sources of Contamination and Probable Contaminants Page 8 5.3 Preliminary Risk Assessment Summary & Recommendations Page 10

GENERAL REFERENCES Page 11 Appendix I

Appendix IIAppendix III

Appendix IV

Site Location Plan, Aerial Photograph, ExistingSite Layout Plan, Proposed Development LayoutPlan, & Site Walkover Record SheetLandmark Envirocheck ReportBGS Borehole Records, Previous Ground

Investigation Borehole Record SheetsConceptual Site Model (CSM)


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1.0 Introduction September 2013

Arc Environmental Limited has been instructed by Fitz Architects Ltd., on Behalf of BBL NE Ltd, toundertake a Phase 1: Desk Top Study Report for the redevelopment of an area of land situated adjacent toMarine Walk, Roker, Sunderland. At this stage it is understood that the redevelopment will be a mixed usedevelopment comprising 5 no. commercial units, 6 no. residential and office units with associated car parkingand bin store.

The primary objectives of the report are to assess the geological and contaminated land conditions on andbeneath the surface, and a preliminary Conceptual Site Model (CSM) has been developed to define the scopeand extent of any further investigation works deemed necessary, prior to commencing with any futuredevelopment. A site reconnaissance (walkover) survey was undertaken as part of this report which involved aninspection of the site and its vicinity. Site photographs were taken during the survey and these can be seenattached in Appendix I, with all relevant observations noted in Section 2.1 below.

2.0 Physical Setting

2.1 Site Details:-

Table 2.1 N = North, E = East, S = South, W = West

Site Name & Address: Land adjacent to Marine Walk, Roker, Sunderland, SR6 0PL.National Grid Reference: 440800,558800 Representative for the central part of the site.Description of Location: The site is a small area of land located adjacent to Marine Walk, Roker, to the north-east of

Sunderland City Centre.Site Boundaries: N = Grassed embankment/Marine Walk, E = Marine Walk with Roker beach beyond, S =

Grassed embankment/Marine Walk with commercial building (Adventure Sunderland)

beyond, W = Grassed embankment with Roker Terrace beyond.Site Shape &

Development Details:Generally rectangular shaped site, c.0.15 Ha in size. The proposal is for a mixed use

development comprising retail, residential and office use.General Topography: The site is located towards the base of a steep embankment with the majority of site area

being generally level.Site Surfacing: Mixed concrete and grassed surfacing.

Above Ground Structures: A retaining wall is present on site with this likely to form part of a building which haspreviously been recorded on site.

Sub-surface Structures &Services:

Relic foundations may be present associated with the building previously recorded on site.In addition, services (i.e. drains, water, etc.) may also be present below the site area.

Summary of RecordedHistorical Features:

The earliest available archive plans (c.1862) indicate the site forms part of Roker Beach.From c.1897 the site forms part of a rail network for Roker Pier and by c.1919 the site is

recorded as undeveloped although the southern portion appears to be lower. From aroundc.1972 a building (former caf) is recorded on site and the building remains up until at leastc.1993. From the site walkover the building floor slab is still present with the walls to the


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3.0 Environmental Setting (Contd)

3.1 Site Geology (Contd):-

3.1.1 Made Ground:-

According to published BGS data, the site lies on an area of made ground. This is confirmed by previousground investigation works completed on site during November 2002 where made ground comprisingdisturbed natural strata with anthropogenic debris (i.e. brick, ash, concrete, etc.) was recorded to depths ofbetween c. 1.20m to c.3.20m below ground level.

3.1.2 Drift Deposits:-

Geological records do not indicate the presence of drift deposits below the site. However, from the boreholespreviously completed on site, loose brown sand with fine to medium gravel was recorded to a depth ofc.4.30m below ground level. In addition, BGS boreholes NZ45NW744 completed c.60m to the south of thesite, record brown sand to a depth of c.3.50m below ground level.

3.1.3 Solid Geology:-

The solid geology underlying the site is shown to comprise the Upper Magnesian Limestone: Roker Dolostone(limestone) formation.

3.2 Coal Mining Assessment:-

As highlighted within Section 3.1.3 and in accordance with the BGS data the site is underlain by Magnesian

Limestone deposits and there are no productive coal seams at shallow depth below the site. Therefore, it is feltthat the site is at not at risk from potential future instability issues from shallow coal mining activities and as aresult, no further assessment or intrusive investigation works are deemed necessary for this development.

3.3 Site Hydrogeology:-

Table 3.1STRATA Aquifer / Soil Leachability EA

ClassificationComments

Made Ground: Soils of High Leaching Potential (U). Soil information for restored mineral workings and urbanareas based on fewer observations than elsewhere. A worstcase vulnerability classification (H) assumed, until proven

otherwise.Drift Geology: Not Classified. Likely to be of medium permeability when considering the

presence of sand deposits below the site.


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3.0 Environmental Setting (Contd)

3.4 Site Hydrology:-

Table 3.2SURFACE WATER

FEATURELocation Comments

GQA Classified River None recorded within c.250m. ~Unclassified

Watercourse(s), Canals,

Ponds & Lakes

One recorded within c.250m. The North Sea is recorded c.100m to the east of thesite.

Flooding The site is shown to fall outwith thedesignated Flood Zone II & III andtherefore this site is unlikely to be atsignificant risk from future flooding.

When considering the site is located immediatelyadjacent to Roker Beach and the North Sea,

consultation with the LA and EA should be madewith regards to potential additional information

relating to this site with respect to periodic flooding,standing water or poor drainage problems.

RAINFALL Measurements (mm) Comments

Annual 651.1

Based on station average measurements fromDurham, dated 1981 to 2010.Precipitation, January 52.3Precipitation, July 54.0

3.5 Site Ecology:-

According to the Landmark Envirocheck Report obtained for this site, there are no sensitive land usesrecorded within c.500m of the site.

3.6 Radon Assessment:-

The site lies in an area where less than 1% of homes are above the radon action level, in accordance with theBritish Geological Survey (BGS), National Geoscience Information Service and their assessment suggests thatthe site does not require radon protection measures. This corresponds with the BRE Digest, BR211 (2007)Radon: Guidance on protective measures for new buildings which records the site to be situated within a cleargrid square (1km), also inferring that no radon protective measures are required for the site.

3.7 Estimated Soil Chemistry:-

Data provided by the BGS in relation to estimated soil chemistry for a number of key metals and metalloidelements are summarised in Table 3.3 below.

Table 3.3


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4.0 Industrial Setting (Contd)

4.1 Recent Site History (Contd):-

Table 4.1

Date Scale Site Adjacent Areasc.1862 c.1895

1:10,5601:2,500

The site is part of Roker Beach. A steep slope is recorded to the immediate west of thesite. Residential housing is recorded c.70m to the west& north-west of the site. Roker Baths Hotel and RokerTerrace (residential housing) is recorded c.100m to the

north-west of the site. A Creosoting Workswithassociated Rail Networkis recorded c.210m to the

south of the site.c.1897 c.1899

1:2,500 &1:10,560

The site forms part of a RailNetworkfor the adjacent Roker Pier.

A Road is recorded c.20m to the west of the site. Theresidential housing to the west has continued to grow.The Creosoting Worksto the south are no longer

recorded, a Saw Millsis now recorded. A Promenadeis recorded c.50m to the north of the site.

c.1919 c.1951

1:2,500,1:10,560

1:10,000

The site is recorded as undevelopedalthough the southern portion of the

site appears lower than the remainingportion with a slight slope recorded.

The residential housing to the west has continued togrow. Two residential properties are recorded c.20m to

the east of the site. The Rail Networkfor Roker Pieris no longer recorded. ATramwayis recorded on

Roker Terrace to the west.c.1955 c.1967

1:1,250,1:2,500 &1:10,000

An extension of the promenade isrecorded on the southern portion of

the site.

A Road/Footpath is recorded to the immediate east ofthe site. The residential properties to the east are

recorded as Roker Pier Cottages.c.1972 c.1996

1:1,250 &1;10,000

A building is recorded on site with thearea to the north shown to be steeply

sloped.

Marine Walk is recorded to the immediate east of thesite. A footpath is recorded to the immediate south-west of the site. By c.1993 a car park and buildings

(commercial) are recorded to the south of the site. Inaddition, the Saw Millto the south is no longer

recorded, residential housing is recorded in its place byc.1998.

c.2013(Present Day)

1:10,000 The building on site is no longerrecorded although the floor slab

remains with thewalls to the north,west & south forming a retaining

wall feature.

Generally as c.1972 c.1996.

Significant features / potentially contaminative uses highlighted in bold text

4.2 Landfill & Waste:-

The following information relating to landfill and waste has been obtained from the Landmark EnvirocheckReport and from the walkover survey completed;


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4.0 Industrial Setting (Contd)

4.3 Statutory Requirements / Authorisations:-

Table 4.2

TYPE Location Comments

Local Authority PollutionPrevention and Controls

None recorded within c.250m. ~

Local Authority IntegratedPollution Prevention and Control


Registered RadioactiveSubstances None recorded within c.250m. ~

Prosecutions Relating toAuthorised Processes

None recorded within c.250m.

Enforcement and ProhibitionNotices


Planning Hazardous SubstancesConsents / Enforcements


COMAH Sites None recorded within c.250m. ~

Contemporary Trade Entries 4 no. recorded within c.250m. Associated with Garage Services, RubbishClearance & Electronic Engineers between

c.81m and c.232m to the west and south-west.None of these are considered to represent asignificant risk to this site or the proposed

development.Fuel Station Entries None recorded within c.250m. ~

4.4 Pollution Incidents and Discharge Consents:-Table 4.3

TYPE Location Comments

Discharge Consents One recorded within c.250m. Associated with the discharge of Final/TreatedEffluent into the River Wear c.151m to the

south of the site. Not felt to represent a risk tothe proposed development.

Water Industry Act Referrals None recorded within c.250m. ~

Prosecutions Relating toControlled Waters


Pollution Incidents to ControlledWaters

One recorded within c.250m. Associated with a Category 3 Minor Incidentdated 23rdDecember 1990, pollutant not given.

Not considered to represent a risk to theproposed development.

S b t ti t d P ll ti I id t T d d ithi 250 A i t d ith i id t d t d 10th J l 2009 &


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5.0 Conceptual Site Model (CSM) (Contd)

This can be done by undertaking a source-pathway-receptoranalysis of the site. The anticipated sources, pathwaysand receptors for this site are summarised in Table 5.1 below.

A graphical representation of the CSM has been produced for this site and can be seen attached in AppendixIV which sets out the critical pollutant linkages of concern for this particular site, with regard to contaminationas highlighted in Table 5.1.

Table 5.1

Sources (S) Pathways (P) Receptors (R)S1 Made ground comprising

disturbed natural stratawith anthropogenic debris.

P1 Ingestion R1 Human health(End users and construction

workforce)P2 Inhalation of indoor /

outdoor air

P3 Dermal contact R2 Surface Water North Searecorded c.95m to the east of the

site & Groundwater(Principal Aquifer)

S2 Hazardous ground gasgeneration associated withoff-site sources.

P4 Migration through existingservices R3 Building materials*

P5 Direct contact with buildingmaterials

R4 Adjacent sites

P6 Surface run off R5 Flora and fauna*

* = Not included in the Human Health & Controlled Waters Risk Assessment

5.1 Geotechnical Considerations:-

The following potential geotechnical issues and hazards have been identified for this site, and these issuesshould be considered before future development of the site is to take place.

Actual depth, origin, variability and condition of made ground present on site Stability of excavations if localised significant thickness of made ground are present below the site Control of surface drainage Geotechnical parameters of the natural drift deposits below the proposed development area. Sub-surface structures (i.e. foundations associated with the building previously recorded on site).In order to determine the geotechnical considerations above with more certainty, it is recommended that

windowless sampling boreholes and associated testing are carried out on this site prior to commencing withany developments in the future.


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5.2 Sources of Contamination and Probable Contaminants (Contd):-

Taking into account the above, the main on site contamination issues are highlighted and listed below;

Made ground present below the site as identified on geological plans and from previous investigationworks carried out.

Hazardous ground gases associated with off-site sources (historic landfills) to the south of the site.It is therefore concluded that ground contamination testing and a programme of gas monitoring will need tobe incorporated into the design of any intrusive investigation works. Laboratory testing should also beundertaken on representative samples taken from site for naturally occurring contaminants which could have adetrimental effect on building materials.

In consideration of the above and when taking into account the guidance contained in the DEFRA and EAContaminated Land Reports and the appropriate DoE industry profiles, it would be prudent to test samples ofsoil from this site for a range of contaminants, as below;

Soils Human Health;

In consideration of the above and when taking into account the guidance contained in Contaminated LandReport 8 and the appropriate DEFRA industry profiles, it would be prudent to test samples of soil from thissite for a range of contaminants, as below;

Typically comprising;Arsenic, Cadmium, Chromium (total, III & VI), Copper, Lead, Mercury, Nickel, Selenium, Zinc,

Cyanide and Total Organic Carbon (TOC), Speciated Polycyclic Aromatic Hydrocarbons( PAHs) & Asbestos fibres.

Additional contamination testing for, Total Petroleum Hydrocarbons (TPHs) should also be undertaken ifthere is any visual or olfactory evidence of fuels / oils present in the ground.

The information reviewed indicates that the site can be considered as being located within aLOW ground contamination risk setting for Human Health.

Groundwater / Leachate Controlled Waters;

The following issues have been taken into consideration when assessing the risks towards groundwater /controlled waters;

The North Sea is recorded c.95m to the east of the site.


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5.3 Preliminary Risk Assessment Summary & Recommendations:-

Human Health At this stage there is felt to be a low risk to human health, due to the limited anticipatedsources of heavy or gross contamination on site, although there is a potential risk of hazardous ground gasfrom off-site sources.

Controlled Waters At this stage, it is considered that both groundwater beneath the site (which is likely to betidally influenced) and the North Sea to the east is at low risk when considering the environmental setting.

However, this will need to be reassessed if elevated levels of contamination are encountered during theintrusive works.

Therefore it is recommended that a detailed Phase 2: Ground Investigation (intrusive investigation) iscompleted for this site to determine if any contamination is present on site which may pose a risk towards theproposed end users or the environment.

Investigation works should be completed prior to commencing with any future developments and should

include for the following or similar;

A series of boreholes including insitu geotechnical testing (Shear Vane / SPT testing) and sampling tohelp aid with future foundation design for the proposed development and to collect samples forsubsequent laboratory testing.

Installation of combined gas / groundwater monitoring wells accompanied by frequent monitoringvisits primarily to determine the gas regime and groundwater levels below the site, in accordance withCIRA 665.

Laboratory geotechnical testing (i.e. particle size distribution, pH & soluble sulphate testing, etc.) Soil contamination screening on selected samples recovered from the boreholes typical contaminants

detailed in Section 5.2.Leachate / ground water contamination screening on selected samples recovered from the boreholes ifelevated levels in the soil are recorded.

Site supervision and production of an interpretive Phase 2: Ground Investigation Report, including aLevel 1 Ground Contamination Risk Assessment

The samples of soil collected should be forwarded to UKAS and MCERTS accredited laboratory to undertakethe recommended testing.

End of Report


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GENERAL REFERENCES

British Geological Survey: Maps, Reports, Memoirs, etc.oSheet 21, Sunderland, 1:50,000 scale, Drift Edition & Solid EditionoSheet NZ45NW, 1:10 500oBGS Borehole Records NZ45NW744oPrevious Ground Investigation Borehole Record Sheets (Solmek/Hymas Geo-environmental

Landmark Information Group, Envirocheck Report, ref: 48962468-1-1 DoE, DEFRA & EA - Contaminated Land Reports.

CLR 1: A framework for assessing the impact of contaminated land on groundwater and surface water. Reportby Aspinwall & Co. Volumes 1 & 2. DoE, 1994.CLR 2: Guidance on preliminary site inspection of contaminated land. Report by Applied EnvironmentalResearch Centre Ltd. Volume 1. DoE, 1994.CLR 3: Documentary research on industrial sites. Report by RPS Group plc. DoE, 1994.CLR 4: Sampling strategies for contaminated land. Report by The Centre for Research into the BuiltEnvironment, The Nottingham Trent University. DoE, 1994.CLR 5: Information systems for land contamination. Report by Meta Generics Ltd. DoE, 1994.CLR 6: Prioritisation & categorisation procedure for sites which may be contaminated. Report by M J Carter

Associates. DoE, 1995.CLR11: Model Procedures for the Management of Land Contamination. DEFRA/EA, 2004.Science Report Final SC050021/SR2: Human Health Toxicological Assessment of Contaminants in Soils, 2009.

Science Report Final SC50021/SR3: Updated Technical Background to the CLEA Model, 2009.Science Report SC050021/SR4: CLEA software (version 1.06) handbook, 2009.

BS10175:2011: Code of Practice for the Investigation of Potentially Contaminated Sites. BS5930:1999: Code of Practice for Site Investigations. Guidance on Investigation and Assessment for Contaminated Sites (CIRIA SP: 103). BRE Digest BR211 (2007): Radon: Guidance on Protective Measures for New Buildings. Guidance for the Safe Development of Housing on Land Affected by Contamination, R&D66, 2008

(NHBC, EA, CIEH).


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APPENDIX I

Location Plan

Aerial Photograph

Existing Site Layout Plan

Proposed Development Layout Plan

Site Observations Walkover Record Sheet


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Documents

ARC Enviromental Report Marine Walk Installation of combined gas / groundwater monitoring wells accompanied by frequent monitoring visits