REPORT C6731RA OCTOBER 2015 REMEDIAL STRATEGY for land …

REPORT C6731RA OCTOBER 2015 REMEDIAL STRATEGY for land at PHASE 2A, SMIRTHWAITE STREET, BURNLEY prepared for KEEPMOAT HOMES LIMITED

REPORT NUMBER:

C6731RS REPORT STATUS:

FINAL

REPORT TYPE:

REMEDIATION STRATEGY

REPORT DATE:

OCTOBER 2015

SITE:

PHASE 2A, SMIRTHWAITE STREET, BURNLEY

PREPARED FOR:

KEEPMOAT HOMES LIMITED

PREPARED BY:

Sirius Geotechnical and Environmental Ltd 4245 Park Approach Thorpe Park Leeds LS15 8GB

Tel: 01132 649 960 Fax: 01132 649 962

This report is written for the sole use of Keepmoat Homes Limited. No other third party may rely on or reproduce the contents of this report without the written approval of Sirius. If any unauthorised third party comes into possession of this report, they rely upon it entirely at their own risk and the authors do not owe them any Duty of Care or Skill.

Remedial Strategy – October 2015 Page i of ii

C6731RS: Smirthwaite Street, Burnley Prepared for: Keepmoat Homes Limited

REMEDIAL STRATEGY

for land at

PHASE 2A, SMIRTHWAITE STREET

BURNLEY, LANCASHIRE

Prepared for

KEEPMOAT HOMES LIMITED

CONTENTS

1. INTRODUCTION ......................................................................................................... 1

2. SITE DETAILS ............................................................................................................ 3 2.1. Site Description .............................................................................................. 3

2.2. Historical Development ................................................................................... 3

3. SUMMARY OF PREVIOUS INVESTIGATIONS ......................................................... 4 3.1. Ground Conditions.......................................................................................... 4

3.2. Identified Contamination ................................................................................. 5 3.3. Hazardous Ground Gas .................................................................................. 5

3.4. Invasive Plants ............................................................................................... 6 3.5. Shallow Mine Workings .................................................................................. 7

4. REMEDIATION STRATEGY ....................................................................................... 8

5. GEOENVIRONMENTAL ENGINEER ....................................................................... 10

6. CONTAMINATION CONSIDERATIONS .................................................................. 11 6.1. Localised Removal of Made Ground ............................................................ 11

6.2. Reporting of Unexpected Contamination ...................................................... 11 6.3. General ......................................................................................................... 12

7. OFF SITE DISPOSAL ............................................................................................... 14

8. CLEAN COVER LAYER CONSTRUCTION ............................................................. 15 8.1. General ......................................................................................................... 15 8.2. Reuse of Topsoil and Subsoil ....................................................................... 15 8.3. Import of Topsoil and Subsoil ....................................................................... 16

8.4. Placement of Cover Soils ............................................................................. 17 8.5. Verification of Required Depth ...................................................................... 17 8.6. Verification of Remediation Scheme............................................................. 17

9. REGULATORY APPROVAL .................................................................................... 18

Remedial Strategy – October 2015 Page ii of ii


APPENDICES

APPENDIX A FIGURES AND DRAWINGS

Drawing No. Title Scale

C6731/01 Site Location Plan 1:50,000

C6731/02 Phase 2A, Site Layout 1:1,000

C4171A/03 Site Features Plan Showing Exploratory Hole Locations 1:1,000

C4171B/06 Supplementary Mining Investigation Exploratory Hole

Location Plan

1:1,000

P1624.ENG008

-01 to 03

External Works Layout 1 to 3 1:200

(@A1)

APPENDIX B TABLE 1 & TABLE 2

Table No. Title

Table 1 Generic Assessment Criteria for Soils

Table 2 Threshold Concentrations for Clean Cover Material for Use in Gardens

of Private Residential Properties

Remedial Strategy – October 2015 Page 1 of 18


1. INTRODUCTION

Sirius Geotechnical and Environmental Ltd (Sirius) was commissioned by Keepmoat Homes

Limited (Keepmoat), to produce a Remedial Strategy, required to facilitate redevelopment of

their Phase 2A area located on land at Smirthwaite Street, Burnley (the “site”). The site location

is presented within Appendix A as Drawing No. C6731/01.

It is understood that Keepmoat propose to redevelop the site for a residential end use

comprising 81 low rise residential houses with gardens including car parking and estate roads. It

is also understood that foundation solutions under consideration generally comprise either

traditional spread foundations or, in the area of the former Hargher Clough, piles terminating in

solid geology and/or ground improvement via vibro replacement techniques.

The proposed redevelopment excludes any significant earthworks and will not significantly

change site levels. The proposed development layout (provided by Keepmoat) is included as

Drawing No. C6731/02 in Appendix A to this strategy. Also in Appendix A and presented as

Drawings No. P1624.ENG008-01 to 03 is the External Works Layout.

The site has been subject to previous geoenvironmental investigations by Sirius and the key

reference documents are:

Geoenvironmental Appraisal of land off Smirthwaite Street, Burnley (Phase 1). Report

C4171. June 2011.

Geoenvironmental Appraisal of land off Smirthwaite Street, Burnley (Phase 2). Report

C4171A. March 2012.

Geoenvironmental Appraisal Report of land off Smirthwaite Street, Burnley (Phase 3).

Report C4171B. May 2015.

C4171B Phase 2, Smirthwaite Street, Burnley - Supplementary Ground Investigation.

Report C4171B. June 2015.

The documents above are the principal source of information used in the preparation of this

Strategy. Although this document summarises the site investigation works undertaken to date,

the reports referenced above should be read in conjunction with this strategy. Please note that

the phases referenced above refer to the Sirius phase of investigation and do not correspond to

the Keepmoat phase of development.



This document details the remedial works required to provide a site considered suitable for a

residential with garden end use. This document is intended to detail the approach to be taken

to ensure that the risks to sensitive receptors are suitably mitigated, potential risks associated

with contamination during the preparatory and construction phase of the development are

controlled, and that any potential contamination not previously revealed during the course of the

previous investigations are dealt with in an appropriate manner.

The main aims of this remedial strategy are:

To summarise the works required to remediate soils at the site to a condition considered

suitable for the proposed end use; and

To satisfy the Local Planning Authority (LPA), Environmental Health Department or other

building warranty providers that the remediated site will be suitable for the proposed

development.

Should changes or amendments to the proposed layout, site levels and / or end use be made,

then these should be confirmed by Keepmoat and if required addendums to this strategy made.

This document is written for the use of Keepmoat. No other third party may rely on or reproduce

the contents of this report without the prior written approval of Sirius. If any unauthorised third

party comes into possession of this report they rely on it at their own risk and the authors do not

owe them a Duty of Care or Skill.

No works should be undertaken on site until the strategy is approved by the relevant regulators.

It is the responsibility of the Principal Contractor (PC) to produce detailed Method Statements

describing how the objectives set out in this remedial strategy will be achieved, with appropriate

consideration of construction environmental management (including but not limited to dust

suppression, odour control, etc).



2. SITE DETAILS

2.1. Site Description

Table 2.1 Current Site Overview

Location The site is located off Smirthwaite Street and Howard Street, approximately

2km west of Burnley town centre.

A site location plan is included as Drawing No. C6731/01 within Appendix A.

National Grid Reference 382620mE, 432270mN

Site Details / Features The Keepmoat Phase 2A area generally comprises several discrete open

grassed parcels of land separated by public highways. For ease of

description this is divided into two separate areas as follows:

West of Hargher Street (Plots 31 – 48): this includes land to the north

of Venice Street and south of Smirthwaite Street with new residential

under construction to the east and existing terrace houses (that front

onto Cog Lane) to the west; and

East of Hargher Street (Plots 49 – 98 and 112 – 124): this includes

land to the east of Hargher Street, south of Accrington Road, east

and west of Clough Street, and north and south of Howard Street.

The Phase 2A Site Layout is identified on Drawing No. C6731/02 included in

Appendix A.

Adjacent land use comprises residential properties to the north, east and

west of the site with industrial buildings and a community centre to the south.

2.2. Historical Development

The eastern part of the site was formerly occupied by residential properties and a social club

since at least 1890. The western part of the site was occupied by a school since at least 1912.

Surrounding land uses include residential and industrial buildings. The school and many of the

residential properties are now demolished and cleared.

Available historical OS maps indicate the presence of a surface water stream (Hargher Clough)

which formerly crossed the east of the site in a southeast-northwest direction, flowing to the

north. The stream appears to have been culverted between 1848 and 1890.



3. SUMMARY OF PREVIOUS INVESTIGATIONS

3.1. Ground Conditions

Sirius has carried out four phases of intrusive fieldworks at the site comprising the excavation of

trial pits as well as the drilling of window sample and rotary boreholes. Exploratory hole

locations are shown on Drawing No. C4171A/03 Supplementary Mining Investigation

Exploratory Hole Location Plan and Drawing No. C4171B/06 Site Features Plan Showing

Exploratory Hole Locations presented in Appendix A.

Exploratory holes generally encountered thin reworked topsoil overlying made ground. East of

Hargher Street, made ground deepened centrally and to the east within the general vicinity of

Hargher Clough (encountered to approximate depths of between 2.2m and 4.1m bgl). Made

ground in the vicinity of Hargher Clough was recorded to comprise cohesive fill, described as

locally soft slightly sandy slightly gravelly clay. Gravel was recorded to comprise brick,

sandstone, concrete and slate. The cohesive fill was found to generally overlie granular made

ground consisting of ash, shells, glass bottles and pottery. Elsewhere made ground was found

to depths of between 1.3m and 1.8m bgl and was recorded to comprise variable cohesive and

granular soils. The made ground generally consisted of soft to firm slightly sandy slightly

gravelly clay and sand and gravel with low to moderate cobble and boulder content of brick,

concrete and sandstone with occasional glass timber and slate. Gravel of slag and clinker were

identified in made ground in WS105 to 0.5m bgl. Domestic waste and electrical equipment was

noted within made ground in TP103.

West of Hargher Street, made ground was encountered to an approximate depth of 0.5m and

was both granular and cohesive. The cohesive fill was described as soft dark greyish brown

sandy gravelly clay with the gravel recorded to comprise brick, sandstone and clinker. The

granular made ground comprised a sandy gravel of brick, sandstone, cement, coal, clinker and

tarmacadam.

Natural strata generally comprised firm to stiff, low to high strength cohesive glacial soils,

recorded to depths exceeding 5.45m bgl. Soft, low strength, organic clay with peat lenses was

identified directly underlying made ground at 4.1m at WS5, indicating possible alluvial

superficial deposits associated with Hargher Clough. Underlying solid geology typically

comprised Lower Coal Measures strata, proven to a maximum depth of 30.00m, comprising

bands of siltstone, sandstone, mudstone and intact coal.



Two intact coal seams were recorded as underlying the site at shallow depth. These are the

Inferior Cannel Mine in the west and the King Mine in the east, each being fault-bounded. The

King Mine seam is the thickest, being recorded on the geological map section at between

approximately 1.4 and 1.8m thick. The Inferior Cannel Mine to the east of the site is recorded to

be between 0.3 and 0.6m thick.

Two faults are recorded to outcrop across the site, aligned roughly north west/south east, within

the eastern and western thirds of the site. The western fault is shown to down-throw strata to

the east with the eastern fault down-throwing strata to the west, creating a central down-thrown

fault block.

Rotary probeholes have not identified evidence of mineworkings within either the King Mine or

Inferior Cannel Mine coal seams beneath the site. However zones of soft strata were

encountered within two probeholes (RO211 and RO212), although given the proven ground

conditions within adjacent probeholes, in addition to the full recovery of flush returns during the

drilling of these probeholes, it is considered that the soft ground encountered is associated with

the presence of either a band of soft weathered coal/mudstone/seat earth, and/or potential

zones of weakness/“wash out” associated with the recorded geological fault and watercourse

within the immediate proximity of these probeholes, respectively.

3.2. Identified Contamination

Selected samples were taken and scheduled as part of the Sirius investigation for chemical

testing. The results identified localised concentrations of polycyclic aromatic hydrocarbons

(PAHs) in made ground soils above generic assessment criteria (GAC) for residential end use.

3.3. Hazardous Ground Gas

The ground gas regime has been assessed and outline recommendations for gas protection

measures for Phase 2A are divided as follows:

West of Hargher Street (Plots 31 to 48): Characteristic Situation (CS) 1, i.e. No gas

protection measures are required.

East of Hargher Street (Plots 49 to 98 and 112 to 124): The overall ground gas regime

has been assessed as CS1, requiring no gas protection measures. However, organic

clay with peat lenses was identified directly underlying the made ground at 4.1m at WS5,

indicating possible alluvial superficial deposits associated with Hargher Clough.



Therefore it is recommended to incorporate CS2 precautions, where houses are piled

over the former Hargher Clough, to mitigate risk from underlying possible fluvial/alluvial

soils.

In accordance with British Standard BS8485:20151 a minimum gas protection score of 3.5

should be achieved through a combination of two or more of the following three types of

protection measures:

The structural barrier of the floor slab;

Ventilation measures; and

Gas resistant membrane.

The installation of gas protection measures and the verification inspections, monitoring and

testing of the measures should be recorded in a report. Reference should be made to any

specific regulatory requirements. The design parameters, specifications, justifications and

method of verification should be approved in advance of the works by the appropriate regulatory

authority.

Radon protection measures are not required for the proposed development on this site.

There may be local shallow areas of potentially putrescible soils, associated with the former

development, for example, in backfilled basements. These soils should be removed from site as

part of the enabling works.

3.4. Invasive Plants

No invasive plant species were identified during the Sirius site investigation.

It is recommended that the presence or absence of invasive species is confirmed by a qualified

consultant ecologist and their advice taken on appropriate treatment. The treatment of any

invasive species, if required, should take place in advance of the proposed construction works.

1 BS 8485:2015, Code of Practice for the Design of Protective Measures for Methane and Carbon Dioxide

Ground Gases for New Buildings.



3.5. Shallow Mine Workings

A total of 45 probeholes drilled as part of previous ground investigations undertaken by Sirius

have not identified evidence of mine workings within either the King Mine or Inferior Cannel

Mine coal seams beneath the site.

However, given the shallow depth of the Inferior Cannel Mine and King Mine coal seams the

possibility of unrecorded historical crop workings / bell pits or unrecorded mine entries cannot

be discounted. It is therefore recommended that all excavations are inspected for the presence

of mine entries/features. If any disturbed ground is suspected, advice regarding treatment /

foundation precautions should be sought from a suitably qualified engineer.



4. REMEDIATION STRATEGY

The primary objective of the remediation works is to render the site suitable for residential

development with gardens whilst mitigating the transient and long term risks to receptors

including human health and the environment.

Following discussion with Keepmoat, it is considered that where made ground is placed or

remains in situ below proposed gardens and public open space, capping is the most cost

effective and sustainable remedial solution.

The main requirements of the remediation works are given below in the approximate sequence

of works. Pertinent elements of the works are discussed in greater detail in subsequent

sections of this document.

Clearance of general debris.

Breaking out and uplifting of relict slabs, foundations, relict structures, and areas of

hardstanding identified at the surface which are not to be retained.

Re-profiling of the site, where required to form a suitable development plateau to

achieve the desired remediated site levels.

A watching brief during site enabling works to identify any previously unidentified

sources of contamination. If any grossly contaminated soils, liquid or drummed wastes,

underground fuel storage tanks (USTs), materials suspected to contain asbestos or

similar are encountered during the remediation works, then a suitably qualified

geoenvironmental consultant shall be consulted.

Placement of “clean” cover soil in all gardens / soft landscaping comprising a minimum

thickness of 150mm topsoil and 450mm subsoil, where made ground is present.

All excavations into natural soils should be inspected for the possible presence of

unrecorded mine entries or infilled unrecorded surface workings (i.e. bell pits).

Validation of the clean cover soil should be carried out by a suitably qualified

Geoenvironmental Engineer (GE). This should be documented in a validation report

produced by a suitably qualified GE on completion of the works. This report will include

verification of the thickness of the capping system and the results of chemical testing to

demonstrate the chemical suitability.



Where made ground extends to a depth of less than 600mm below finished garden levels and a

cover layer cannot be incorporated, consideration should be given to localised full depth

removal of made ground to a licenced waste disposal facility and levels made up with clean

subsoil and topsoil as required.

As it is understood that shallow made ground to the west of Hargher Street is to be subject to

complete removal in order to construct floor slabs to plots (also removing the need for cover

soils in gardens), it is considered that potential volatile vapour hazards presented by localised

elevated naphthalene impacted made ground (recorded in TP302 only) will not be required.

Made ground in TP302 was recorded as extending to only 500mm below original ground level.

Notwithstanding the above, in the event a suspended floor slab is to be constructed (e.g. where

made ground is >600mm thick or ground improvement is undertaken) and made ground

remains beneath the dwelling, it is recommended that an appropriate vapour resistant

membrane is installed and selected in accordance with CIRIA 748 and validated in accordance

with CIRIA 735.



5. GEOENVIRONMENTAL ENGINEER

A suitably experienced and qualified Geoenvironmental Engineer (GE) should be appointed by

Keepmoat to validate the removal of made ground in areas to the west of Hargher Street, as

well as verify the construction of clean cover capping system, as required in garden / soft

landscaping areas.

The responsibilities of the GE shall include, but not be limited to, the following:

Liaison with Client, their appointed Principal Contractor (PC) and statutory bodies in

relation to the remedial works.

Supervision and quality control of the remedial works.

The supervision of soil sampling as required under the strategy.

Implementation of additional testing and contingency measures if unexpected

contamination is found during the work.

Attendance at site to inspect and sample cover soils as instructed by Keepmoat or their

PC.

Review of site records and test results as they become available and make comment

and act upon those results accordingly.

The GE will provide either a single validation report for the entire site, or a series of validation

reports detailing the works undertaken including those associated with any unforeseen

contamination encountered. The validation report(s) shall include relevant site records

including:

Demonstration of cover layer thickness and chemical suitability of both placed subsoil

and topsoil;

Detailing areas where clean cover soils are not required; and

Acting as certification that the cover layer has been constructed in accordance with this

strategy.

The report(s) will serve to confirm the works were undertaken in accordance with the relevant

legislation, the remediation strategy and any relevant planning conditions, together with

detailing any agreed departures from the above, if required.



6. CONTAMINATION CONSIDERATIONS

6.1. Localised Removal of Made Ground

Where a clean cover layer is not proposed, for example potentially in the area to the west of

Hargher Street, then these areas must be validated that made ground has been removed.

Following the removal of made ground and prior to any infilling works, validation samples for

chemical analysis shall be taken by the GE from the exposed natural ground surfaces i.e. on a

nominal 25m grid or as agreed with the GE, to confirm that all potentially hazardous made

ground has been removed. All testing should be undertaken at a UKAS and MCERTS

accredited laboratory.

Samples shall be tested for the identified contaminants of concern including pH, total metals

(copper, nickel, zinc, chromium (total), chromium (VI), arsenic, mercury, selenium, cadmium and

lead) and speciated PAHs. The results will be compared to the residential GAC listed in Table 1

in Appendix B of this strategy. Analysis for other determinands may be appropriate and should

be undertaken as necessary.

If the referenced GAC concentrations are exceeded then additional soils should be removed

and further validation samples recovered. This shall be an iterative process until validation test

results fall below the referenced concentrations or until excavation depth reaches 600mm in

gardens or the depth of the underside of floor slabs below plots.

Any excavations backfilled prior to receipt and review of laboratory validation test results by the

GE, are done so at the risk of the Contractor.

6.2. Reporting of Unexpected Contamination

In addition to the potential contamination associated with made ground, there is the possibility

that areas of more significant contamination not previously identified may be encountered

during redevelopment.

Vigilance should be maintained during site clearance and construction works for any hotspots

not identified as part of the intrusive works. If any previously unidentified grossly contaminated

soils, liquid or drummed wastes, or similar are encountered during site clearance/ development

works, they should be reported and appropriate advice sought from the GE. Any deviation from

this strategy should be agreed with the local authority.



The possibility of encountering asbestos containing materials (ACMs) (such as asbestos

sheeting, used as shuttering, and/or fragments of asbestos-containing materials within made

ground or fill materials) cannot be entirely discounted. If suspected ACMs are encountered,

work in the immediate area should cease and the excavation covered over and recorded

pending specialist advice from an appropriately qualified asbestos specialist and an appropriate

strategy developed for the safe removal/disposal of the material.

Additional laboratory analysis of any previously unidentified contamination sources will be

required in order to determine the requirements for remediation and should be assessed against

residential with plant uptake assessment criteria detailed within Table 1 in Appendix B to this

strategy.

6.3. General

Excavations should not be left open for longer than is necessary and should be securely

cordoned off using appropriate fencing and warning signs, whenever excavation works are

suspended.

Any potentially contaminated materials requiring assessment or contaminated materials

designated for removal from site shall be placed in temporary stockpiles on hardstanding or

heavy-duty Visqueen sheeting, suitably covered and bunded with appropriate signage and

identification. Off-site disposal requirements are discussed in Section 7 of this strategy.

During the remediation and construction it will be necessary to protect the health and safety of

site personnel. General guidance on these matters is given in the Health and Safety Executive

(HSE) document ‘Protection of Workers and the General Public during the Redevelopment of

Contaminated Land (HS(G)66)’. In summary, the following measures are suggested to provide

a minimum level of protection:

All ground workers should be issued with high visibility clothing, hard hats, protective

footwear and impermeable heavy duty gloves. Personnel should be instructed as to how

they are to be used;

Hand washing and boot cleaning facilities shall be provided;

No smoking on site other than in designated areas if any are present on site; and,

Good practices relating to personal hygiene shall be adopted.



Before site operations are commenced the necessary COSHH Assessment, Method Statements

and Health and Safety Plans should be completed and issued by the PC in accordance with the

CDM Regulations 2007.

All site personnel shall undergo a site specific health and safety induction prior to

commencement of work on site.

During the progress of the works, if significant dewatering is required necessitating disposal to

surface water drains or foul sewer, appropriate discharge consents must be obtained from the

Environment Agency / appropriate water authority. This is likely to require chemical analysis of

such groundwater. In the event that significantly contaminated groundwater is encountered, this

should be removed by tanker and disposed at a licenced disposal facility.

The PC shall ensure that potentially contaminated waters and leachate from excavations or

stockpiling areas do not reach watercourses, surface water drains, etc.

All such waters will be removed from site by tanker to a suitable disposal facility or alternatively

treated on site for subsequent disposal to foul sewer.

The PC will be responsible in obtaining all necessary permits and consents for disposal to foul

sewer prior to the commencement of works.

Contaminated waters pumped from excavations should be stored in a holding tank and

chemically tested prior to disposal. All discharges to foul sewer should be recorded in relation to

date, time, quantity and quality. All records should be maintained at all times and be made

available to the GE upon request.



7. OFF SITE DISPOSAL

Any material removed from site as part of the enabling/ remedial works shall be disposed of at

an appropriate facility, in accordance with Duty of Care (DoC) Regulations/ Waste Management

Guidance.

Materials designated for off-site disposal shall be safely stockpiled, sampled and analysed at

rates sufficient to allow the material to be adequately categorised to the satisfaction of the

receiving landfill operator in accordance with the Hazardous Waste Regulations (HWR) 2005.

Any material exported from site to landfill shall be hauled by a registered waste carrier in

accordance with the HWR and DoC regulations. A waste transfer or consignment note shall be

completed, signed and retained by all parties involved. The waste transfer or consignment note

shall state the volume of waste, a physical description of the waste and statement of its

chemical composition.

These notes shall be kept by the PC for a period of at least two years and copies of all

paperwork should be provided to Keepmoat.



8. CLEAN COVER LAYER CONSTRUCTION

8.1. General

The remediation strategy for the site, with respect to protection of future end users, includes for

the provision of a ‘clean’ cover layer soil capping system to form a physical separation between

made ground contaminants and site end users within soft landscaped areas, where made

ground remains at development level.

In summary, the make-up of the clean cover system shall be as shown in Table 8.1.

Table 8.1 Clean Cover Layer Thickness

Area Subsoil (mm) Topsoil (mm) Total (mm)

Garden areas 450 150 600

* A minimum 100mm topsoil is recommended in accordance with NHBC Standards Chapter 9. However, an increased topsoil thickness may be required by the Local Authority. In any case, an increased thickness may be placed if desired, with corresponding reduction in subsoil thickness to achieve total thickness shown.

Subsoil / topsoil shall be naturally derived, free of any foreign / man made materials and comply

with the requirement of Sections 8.2 and 8.3.

8.2. Reuse of Topsoil and Subsoil

Any site won topsoil or subsoil materials proposed for use in the ‘clean’ cover layer shall be

tested at a frequency of 1 sample per 100m3 to confirm its suitability for re-use on the site. All

testing shall be carried out at a UKAS and MCERTS accredited laboratory, for the following

suite of determinands:

pH, total metals (copper, nickel, zinc, chromium (total), chromium (VI), arsenic, mercury, selenium, cadmium and lead), speciated polyaromatic hydrocarbons, speciated TPH (Aliphatic / Aromatic split), phenols (analysed as total monohydric phenols), water-soluble sulphate and asbestos.

A proportion of the subsoil required for the capping layer may be generated, as natural or re-

worked residual soils, during excavation on site, for example, during earthworks, installation of

sewers, or from foundations arisings. However, the reuse of site won natural soils within the

clean cover layer will require careful control of excavation arisings and soil management during

the development.



Owing to the potential for cross-contamination of natural soils during excavation or subsequent

stockpiling prior to use, any site won natural soils, proposed for re-use as subsoil materials in

the make-up of the ‘clean’ cover layer shall be tested at the same frequency and for the same

suite of determinands as detailed for site won topsoil above.

General

The analytical testing will be undertaken on a seven day turnaround and shall be forwarded to

the GE as they become available. The results shall be compared with the threshold guideline

values given in Table 2 in Appendix B of this strategy. Should any analyte exceed the

concentrations shown, then the soil should be considered unsuitable for use within the capping

layer.

8.3. Import of Topsoil and Subsoil

For any imported materials required to complete the cover soils, then these shall be tested in

accordance with the guidance given in the YAHPAC document Verification Requirements for

Cover Systems, Version 3.2 dated October 2015. These are summarised in Table 8.2 below.

Table 8.2 Sampling and Testing for Imported Soils

Type Number of Samples Testing Schedule Assessment Criteria

Virgin Quarried Material

1 or 2 depending on the type of stone used

Standard metals/metalloids (As, Cd, Cr, Cr(VI), Cu, Hg, Ni, Pb, Se, Zn)

As per Table 2

Appendix B

Crushed Hardcore, Stone, Brick

Minimum 1 per 1000m³ Standard metals/metalloids (As above)

PAH (16 USEPA speciation)

Asbestos

Greenfield/ Manufactured Soils

Minimum 3 or 1 per 250m³ (whichever is greater)

Standard metals / metalloids (As above)


Asbestos

Brownfield/ Screened Soils

Minimum 6 or 1 per 100m³ (whichever is greater)

Standard metals / metalloids (As above)


TPH (CWG banded)

Asbestos

Any additional analysis dependant on the history of the donor site.

The test results shall be made available to the GE prior to any material being delivered to site.



8.4. Placement of Cover Soils

Clean cover soils shall be placed in all areas of gardens and soft landscaped areas throughout

the site where made ground underlies the site. The cover soil materials shall be placed by

Keepmoat or their subcontractor(s), and shall be lightly compacted following placement, to

ensure minimal future settlements.

It is envisaged that capping soil horizons shall be placed within individual areas of garden and

landscaping on completion of development of individual plots. This will act to minimise the

potential for disturbance of the capping system and physical destruction of topsoil structure i.e.

via plant trafficking, following placement.

Notwithstanding the above, following placement of the clean cover layer, care will be required to

prevent cross contamination of the clean cover layer soils with adjacent materials. Keepmoat

and their subcontractor should provide method statements and adopt methods of work for

activities which may give rise to cross contamination between site areas and soil types.

8.5. Verification of Required Depth

Verification of depth of topsoil and subsoil shall be carried out by a suitably qualified GE by

excavation of a small trial pit. Pits shall be excavated at a rate of 1 per 3 plots for private rear

garden areas or spaced on a minimum of a 25m grid for landscaped/POS areas (minimum 3 per

landscaped area). The frequency should be agreed with the Local Planning Authority (LPA) /

Environmental Health Department. Evidence for validating the depth of cover shall accord with

the YAHPAC document Verification Requirements for Cover Systems, Version 2.2 dated

September 2015.

8.6. Verification of Remediation Scheme

A verification report must be prepared that documents completion of the measures described in

the approved remedial strategy. This must be submitted to and approved in writing by the LPA.



9. REGULATORY APPROVAL

A copy of this specification should be forwarded to the LPA, and other regulators as appropriate

for their approval prior to the works.

Sufficient time should be allowed for regulatory approval to be obtained during the

redevelopment programme.

APPENDIX A

DRAWINGS AND FIGURES

Site Location Plan

C6731

Remediation Strategy Smirthwaite Street Burnley

Keepmoat Homes Limited

Scale

Approved Drawn by

Drawing Number

Reproduced from the Ordnance Survey 1:50,000 scale Landranger® map with the permission of The Controller of Her Majesty’s Stationary Office, © Crown Copyright. All rights reserved. Sirius Geotechnical & Environmental Ltd, Suite 2, Russel House, Mill Road, Langley moor, Durham DH7 8HJ. Licence No. 100042005

Contract Number

Contract

Client

1:50,000

C6731/01

THE SITE

N

SA IP

T

A

R

M

A

C

G

R

A

S

S

B

L

O

C

K

P

A

V

IN

G

K

E

R

B

H

A

R

D

S

T

A

N

D

IN

G

G

R

A

S

S

C

o

n

c

r

e

te

T

A

R

M

A

C

T

A

R

M

A

C

T

.

F

IR

.F

T

A

R

M

A

C

T

P

S

H

A

R

D

S

T

A

N

D

IN

G

T

A

R

M

A

C

T

A

R

M

A

C

S

W

A

L

L

B

W

A

L

L

H

A

R

A

S

.F

R

IN

G

C

O

B

B

L

E

S

T

A

R

M

A

C

B

W

A

L

L

IR

.F

IR

.F

B

W

A

L

L

C

O

N

C

R

A

M

P

S

W

A

L

L

IF

S

W

A

L

L

BW

ALL

G

R

A

S

S

G

R

A

S

S

G

R

A

S

S

A

c

c

r

i

n

g

t

o

n

R

o

a

d

C

l

o

u

g

h

S

t

r

e

e

t

A

c

c

r

i

n

g

t

o

n

R

o

a

d

G

r

o

v

e

S

t

r

e

e

t

C

l

o

u

g

h

S

t

r

e

e

t

C

o

g

S

t

r

e

e

t

C

o

g

S

t

r

e

e

t

S

w

irth

w

a

ite

S

tre

e

t

S

w

i

r

t

h

w

a

i

t

e

S

t

r

e

e

t

C

o

g

S

t

r

e

e

t

C

o

g

L

a

n

e

Cog Lane

H

a

r

g

h

e

r

S

t

r

e

e

t

H

a

r

g

h

e

r

S

t

r

e

e

t

H

a

r

g

h

e

r

S

t

r

e

e

t

H

o

w

a

r

d

S

t

r

e

e

t

H

o

w

a

r

d

S

t

r

e

e

t

H

o

w

a

r

d

S

t

r

e

e

t

H

o

w

a

r

d

S

t

r

e

e

t

B

r

u

c

e

S

t

r

e

e

t

P

o

l

l

a

r

d

S

t

r

e

e

t

C

l

o

u

g

h

S

t

r

e

e

t

C

l

o

u

g

h

S

t

r

e

e

t

P

e

r

t

h

S

t

r

e

e

t

P

e

r

t

h

S

t

r

e

e

t

T

a

y

S

t

r

e

e

t

T

a

y

S

t

r

e

e

t

C

o

g

S

t

r

e

e

t

IR

.F

IR

.F

Culvert

Preliminary Rotary

Probehole

Secondary Rotary

Probehole

Trial Pit

Phase 3 Rotary

Probehole

Conjectured Line

of Fault

Phase 2 Area

Boundary

Phase 3 Area

Boundary

PAPER SIZESCALE

APPROVED BYDRAWN BY

DRAWING NO.

DATE

SITE

REVISION NO.

CLIENT

C

D

A

B

REVISION

0

NOTES

KEEPMOAT HOMES

C4171B/06 0

NJI MB

May 2015 1:1000

A3

N

DRAWING TITLE

SIRIUS GEOTECHNICAL

& ENVIRONMENTAL

4245 Park Approach,

Thorpe Park,

Leeds

LS15 8GB

TEL: 0113 264 9960

FAX: 0113 264 9962

www.thesiriusgroup.com

>>

>>

>>

>>

>>

SMIRTHWAITE STREET,

BURNLEY

SUPPLIMENTARY MINING

INVESTIGATION

EXPLORATORY HOLE

LOCATION PLAN

PROPOSED GROUND FLOOR SLAB LEVEL

HEIGHT FROM PROPOSED GROUND LEVELTO FFL

225

DOUBLE DAMP PROOF MEMBRANE(SLAB LEVEL + 150 ABOVE SLAB LEVEL)

DD

PROPOSED FALLS

DRAINAGE CHANNELDC

ACCESS TO GAIN PART 'M' ACCESS OTHERTHAN FRONT DOOR

900 WIDE, 300 GOING, 150 RISERCONCRETE FLAG STEPS ON BRICKWORK

PROPOSED EXTERNAL LEVELS

EXISTING LEVELS

GT GRAVEL TRAP

EXTERNAL WORKS KEY-

EXISTING TIE IN LEVELS

CONCRETE POST AND PANEL FENCE1

MASONRY WALL WITH TIMBERFENCE PANELSPCC PAVING FLAG ON EDGE

RW (150)

2

3

RW (300)

RW (450)

RETAINING WALLS-

(300) = RETAINED HEIGHT

66.700

66.700

G

G

G

G

G

G

G

G

G

G

G

G

G

145.17144.66

144.08

143.85

143.49

143.65144.02

144.41

143.70143.59

143.50143.99

144.41

143.78

143.39

144.66

144.84

144.59 145.05 145.40

143.49143.54

143.56143.69

143.81

143.78143.45

142.88142.46

142.36142.27

142.37142.52

142.71142.95

143.09

143.15143.27

143.35

143.33143.42

143.33143.27

143.24ACCRINGTON ROAD

CLOUGH STREET

GROVE STREET

143.825144.195

144.585

144.765 145.225

144.585 145.015

143.955

143.565

143.445143.525

143.665143.715

143.735

143.865

143.985

143.505

144.255

144.025

143.875143.765

143.665143.635

145.345144.835

143.955143.590

143.055142.635

142.535142.445

142.180142.220

142.545142.695

142.870143.125

143.265

142.355 142.395

144.745

143.762144.073

143.715143.820143.847 143.778

143.777

143.950

143.921

144.125 144.120

145.284

145.184145.235

144.125

144.096143.902

143.964

144.140144.200

144.395

144.286

144.763144.971

145.200

145.900

145.900

145.5323

RW (400)

145.450

145.300

146.450

145.250

145.050

450 mm Step3RW (450)

145.000

145.150

145.150

3RW

(400)

145.150144.550

144.165145.150

144.700

450

975

675

975 1050

145.00

144.450

144.054

144.600 144.600

144.600144.600144.325

600 600

2RW (1000)

3RW (650)

600 600

300

144.565

145.000

145.000

145.175 145.075

145.325

145.175

144.497144.096

145.000

144.750

145.092

145.400

145.400145.400

145.400

145.250

145.000

145.300

145.150 145.300

143.985144.296 144.000

144.875

144.000

144.000

144.000

144.000

144.000

3RW (300) 143.850144.000

144.000

143.850

143.850

144.750

144.285

143.750

144.185

145.125

144.025

144.125

2RW (650)

143.750

143.500

143.892 143.810 143.777143.730

143.696 143.673 143.642 143.595 143.590 143.545

143.495

143.341

143.070

142.815

142.571 142.648142.500

142.424

142.911

143.150143.377

143.668

143.790143.790

143.640

3RW (450)

143.640

450

143.750

143.750

143.750143.750143.600 143.600

143.600

143.600

143.550

143.600

143.500

143.500143.500

143.500

143.660

143.550143.550

143.600

143.660143.660

143.600

143.650143.650

143.480

143.480 143.445

143.565143.530

143.200

143.550

143.350

375375

143.350

143.350143.000

143.150

143.150143.150

143.150

143.550

375

375

143.050

142.975

142.750

142.975

143.000

142.825142.825

142.340

143.100

143.250

143.100

3RW (350)

2RW (825)

143.250

142.800

900900

600

144.245144.551

144.235 145.522

145.264144.290

143.775143.820

143.754143.700

143.629143.582

143.525143.552

144.498

145.750

RW (600)

145.700145.800

525

145.850

144.801

10501050

2RW (1050)

145.850

145.700

2RW (1050)

144.701145.098

144.300

144.150

144.300

143.850143.850

144.150

150

450150

143.850

145.400 145.400

145.300

3RW

(375)

144.225

144.000

145.400145.400

143.600

143.550

RW (300)

GT

143.700

145.550

144.385

144.635

144.610

144.350

RW (1050)

144.800

145.230

144.000

144.285

144.256

144.400

143.550

143.700

143.600

150

450450

143.700

143.700

RW (375)

136 128

3Steps

6Steps

4Steps 4Steps

2Steps

2 Step

1 Step

1 Step

2 Step

2 Step

2 Step

2 Step

3Steps

1 Step

1 Step

2 Steps

2 Steps

2 Steps

2 Steps2 Steps

2 Steps

2 Steps

1Step

3 Steps

6 Steps

3 Steps

4Steps

7Steps

3 Steps

2 Steps

1 Step

1 Step

3 Steps

1 Step

143.450

143.000

225

0

150

143.550

143.550143.500

144.485

142.545 142.725

142.875

143.580

100 BN

100 BN

100 BN

100 BN

100 BN

100 BN

100 BN 100 BN

100 BN100 BN

100 BN

100 BN

100 B

N

100 BN

100 BN

100 BN

TAY STREET

G

G

143.100142.715

2 Steps

142.500

RW (3

00)

RW (300)

142.925

600143.200

142.590

142.800G143.075

142.875

142.780

142.800 142.880

RW (450)

G143.350

RW (600)

100 BN

100 BN

Item Description

Legend

Notes

DO NOT SCALE.

ALL LEVELS ARE IN METRES AND TO ORDNANCE DATUM.

REFER TO AUGHTON LAND SURVEYS DRAWING No KEEP/04/11

FOR EXISTING SURVEY INFORMATION.

DRAWING TO BE READ IN CONJUNCTION WITH ALL RELEVANT

ARCHITECT'S AND ENGINEER'S DRAWINGS, SPECIFICATIONS

AND SITE INVESTIGATION REPORT.

ALL WORK IS TO BE CARRIED OUT IN ACCORDANCE WITH THE

CDM REGULATIONS 1994 ALONG WITH THE MAIN

CONTRACTORS - HEALTH & SAFETY PLAN.

Keepmoat, Keepmoat House, 2 Windward Dr,Estuary Drive, Speke, Liverpool, L24 8QR.Tel: 0151 7281200 www.keepmoat.com

Keepmoat®

Checked by

Drawn By

Drawing Title

Drawing Number

Revision

Location

Development

Marketing Name

Date Started

Scale @ A1

Date Checked

Smirthwaite Street

Burnley

P1624.ENG008-01

C

P.A.S.

T.M.D.

1:200

May 2015

DateRevision Amendment Initials

15.07.2015A Amended to suit updated layout P.A.S.

20.07.2015B Amended to suit updated layout for

parking areas 81,87 and 78,79

P.A.S.

14.08.2015C Entrance to parking areas 81,87

relocated

P.A.S.

G

G

G

G

G

G

G

G

G

G

G

G

G G

G

G

G

147.05147.21

147.08146.62

146.15145.71

145.17144.66

144.08

143.85

146.83146.95

143.49

143.65144.02

144.41144.98

145.44145.94

146.23

146.24146.33146.47

143.70143.59

148.16

147.52 147.45 147.36 147.24 147.04 146.87 146.75

147.28147.38147.52147.63147.71147.82147.95148.09

148.31148.28

148.19

144.41

143.78

145.45144.84

144.59 145.05 145.40

146.73146.54

146.30

145.82

145.29144.70

146.28

146.41

146.92

147.22

147.40

147.51

147.33

147.02 147.09

147.11147.39

147.58147.38147.27147.24147.22

146.88146.77

143.54143.56

143.69

143.81

143.78

145.22

145.41

HOWARD STREET

CLOUGH STREET

BRUCE STREET

HARGHER STREET

147.610 147.570 147.220 147.100 146.990 147.280147.057146.990147.330

147.130

147.720

147.225147.255 147.005147.125 146.505146.645

146.905146.715 147.505146.405

143.825144.195

144.585145.155

145.615146.115

146.475

145.995

145.465144.848

144.765 145.225 145.635146.455

144.585 145.015

143.955

143.985

144.255

144.025

143.875143.765

143.665143.635

146.795146.325

145.885145.345

144.835

225

147.895148.335

148.216

148.250

148.100 148.100

148.083

148.250

148.100148.100

148.100

147.404147.469

147.900

147.800

148.000

147.540

147.640147.833

147.733

147.650

147.800

147.700

147.750147.680

147.450

147.900

147.625

147.900

148.000148.000

147.780

100 BN100 BN

100 BN100 BN

100 BN

100 BN

100 BN

100 BN

100 BN

100 BN 100 BN

100 BN147.850 147.850

147.850147.8053RW (450)

225

148.000148.000

3RW (450)

147.600147.575

147.450

147.450

146.920146.910 146.970 146.997147.450147.450

147.600

147.600

3RW (450)

147.600

147.600

3RW (450)

146.920

146.930

147.020

147.200

147.100

147.100

147.150147.250

146.870

146.950

147.000

147.040

147.100

147.250147.150

147.175

147.075

147.060147.060

146.980 147.005

147.565147.422

147.495

147.550147.550

147.400147.400

147.400 147.400

147.550

147.550

147.305 147.085

146.607146.790

146.688

146.512 146.395

146.700

146.588

146.782 146.471146.531

145.910

144.745145.016

143.762144.073

143.715143.820143.847 143.778

143.777

143.950

143.921

144.125 144.120

145.284145.335

145.184145.235

144.125

144.096

143.902143.964

144.140144.200

144.395

144.286

144.763144.971

145.200145.720

145.969146.153

146.235146.424

146.651

145.765

146.688

146.850

146.850

146.700146.700

146.975

146.700

146.700

146.825147.100

147.300

147.300

147.300 147.300

147.300

147.300

147.241

146.889

3RW (450)

147.000

146.750

146.900

146.450

675

2RW

(600)


146.000

146.150

146.150

146.000

146.750145.750

145.900

145.900

145.5323

RW (400)

145.450

145.300

146.450

145.250

145.050


145.000

145.150

145.150

3RW

(400)

145.150144.550

144.165145.150

144.700

450

975

675

975 1050

145.00

144.450

144.054

144.600 144.600

144.600144.600144.325

600 600

2RW (1000)

3RW (650)

600 600

300

144.565

145.000

145.000

145.175 145.075

145.325

145.325

145.325145.175

145.175

146.150

146.050146.275 146.100

146.550

146.700

146.700

146.550

144.497144.096

145.000

145.845

145.500

145.250145.350

145.600

144.750

145.092

145.250

145.400

145.400145.400

145.400

145.250

145.000

146.535

146.605

146.165

146.635

146.691

146.535 146.535 146.535146.635

146.635146.635

146.4

85

146.635 146.635 146.635 146.635 146.485146.485

146.000

2RW (650)

2RW (650)

146.150146.150

145.850145.400

145.150

146.1

8514

6.185

146.3

35

146.1

85

146.012

146.335

2RW

(650)

145.061

145.300

2RW

(600)

0 300

0

145.150 145.300

143.985

144.296 144.000

144.875

144.000

144.000

144.000

144.000

144.000

3RW (300) 143.850144.000

144.000

143.850

143.850

144.750

144.285

143.750

144.185

145.125

144.025

144.125

2RW (650)

143.750

143.500

143.892

146.838 147.095 147.297146.952 147.037

146.167145.946

145.595144.965

144.245144.551

144.235 145.522 146.035

145.564145.264144.290

143.775143.820

143.754143.700

145.915145.822145.718

146.700

146.850

146.850

146.850

146.400

146.550

146.550

146.000146.325

146.500146.700

146.700

146.500146.250

145.900145.580

145.860

146.425146.600

146.800146.800

146.550

145.910146.200

146.100

525

525

146.400

146.550

146.550

146.010

146.150

145.680145.960

145.725145.825

145.287145.231

3RW

(450)

3RW

(450)

145.215

146.500

146.400

145.565

2RW (900)

145.115

145.465

145.515

145.750

2RW (1050)

2RW (600)

525

1200

675

146.200

146.250

146.300

450

145.700

145.9

50

146.0

25

146.1

75

146.1

75

145.935

145.800

145.325525

145.850

144.801

10501050

2RW (1050)

145.850

145.700

2RW (1050)

144.701145.098

146.0

25

146.3

00

146.146 146.310

146.3

0014

6.300

147.2

50

146.5

00

146.400

146.400

147.400

147.500

147.600147.000

147.000

147.450147.600

0225

150

147.000

147.150

147.000

147.450

450 STEPRW

(450)RW

(450)

146.930146.950

146.910

146.900

146.600

145.400GT

145.550

145.400

144.300

144.150

144.300

143.850143.850

143.850

144.150

150

450150

143.850

145.400 145.400

145.500

145.300

3RW

(375)

144.225

144.000

145.400145.400

143.600

RW (300)

145.550

145.550

144.350

RW (1050)

144.800

145.230

144.000

150

450450

RW (375)

150

0

450

DC DC

DC

146.000

22

23

2

178

1Step

3 Steps

1Step 1Step

3Step

1 Step

3Steps

3Steps

6Steps

4Steps 4Steps

2Steps2Steps

2Steps

1 Step

1 Step2 Steps

2 Steps

2 Steps

2 Step

1 Step

1 Step

2 Step

2 Step

2 Step

2 Step

3Steps

3Steps

6Steps

8Steps

4Steps

1Step

7Steps

3 Steps

2 Steps

1 Step

3 Steps

146.3

00 225

150

146.450

146.2

75

146.0

25

146.175

1 Step

145.8

25

145.745

1 Step

146.030

0225

150

3 RW (300) 146.175

145.60



225


DD

PROPOSED FALLS

DRAINAGE CHANNELDC




EXISTING LEVELS

GT GRAVEL TRAP

EXTERNAL WORKS KEY-




RW (150)

2

3

RW (300)

RW (450)

RETAINING WALLS-


66.700

66.700

Notes

DO NOT SCALE.











Keepmoat®

Checked by

Drawn By

Drawing Title

Drawing Number

Revision

Location

Development

Marketing Name

Date Started

Scale @ A1

Date Checked

Smirthwaite Street

Burnley

P1624.ENG008-02

A

P.A.S.

T.M.D.

1:200

May 2015


Item Description

Legend


G

G

G

G

G

G

G

G

G

147.21

147.08146.62

146.15145.71

148.16

149.82

150.7

6

150.5

2

150.4

3

150.0

8

149.63

149.7

8 149.78

HARGHER STREET

VENICE STREET

147.255

146.795146.325

145.885145.720

145.969146.153

146.235146.424

146.651146.889

146.150

149.700

149.7

00

149.600

149.550

149.350

149.000

149.040

150.825150.735 150.655

150.595150.425 150.345 150.285

150.165150.105

150.015

150.915

150.700

150.600

150.700

150.600

150.550

150.750150.795

150.600150.600

150.525

150.321

150.675 150.635

150.700150.700150.785

GT

150.850

150.850

150.750

150.750

150.750

150.850

150.850

150.750

150.700

150.700

149.610

149.450

149.675

150.458

150.595

150.610

150.5

50

150.6

71

150.5

71

150.4

71

150.4

31

150.735

150.615

150.49

150.411

150.371

150.531

150.491

150.471

150.531

150.411

150.706

150.586

150.91

150.790

150.706

150.666

150.665

150.586

150.546

150.6

06

150.8

46

150.750

150.600

150.751

150.600

150.631

150.550

150.400

150.550GT

150.600 150.600

150.550

150.550

150.550

Levels/gradient taken fromQueensberry drawingQD522-04-01 Rev I

150.230150.255

149.900

149.972

150.100

150.050

149.900

150.100

149.800

149.825

149.985

149.950149.950 0 300

0 300149.950

149.855149.800

149.875

DCDC

150.100

150.100

149.950

149.950

0 300

150

150.044

149.800

150.510

150.510

150.440

150.475

150.660

150.660

150.510

150.7

90

150.5

90

150.5

90

150.510

150.660

150.660

150.450

150.000

RW (450)

150.150

RW (450)

150.450

150.410

149.850

149.8

50

150.759

150.5

50

150.150

150.000

150.300

150.400

150.4

00

150.5

00

150.613

150.500

150.364

150.5

50

150.5

50

150.400

150.4

00

150.550

150.500

150.600

150.5

50

150.5

50

150.4

00

150.525

149.610

150.715

150.5

00

150.4

4015

0.450 150.500

150.6

50

150.6

50

150.6

50

150.6

50

149.980

150.749

149.800

149.800

150.9

15

150.600

DCDC

ROAD 2

ROAD 1

152

Schoolhouse Hargher House

The

1

7

41

7

6

E

l

S

u

b

S

t

a

C

o

m

m

u

n

ity

C

e

n

tre

1

4

4

150.700

150.575

150.850

2 Steps

2 Steps

1 Step

148.300148.300

148.050148.050

147.900147.450

148.000

148.000

148.500

148.500

150.030

148.560

RW (1350)

149.900

148.600RW (900)

150.000

148.8

50

148.7

00

148.150RW (900)

148.7

50

149.000

148.8

50

148.900

148.100

148.100

148.900

DC

148.560

FFLs taken from Queensberrydrawing QD522-04-01 Rev I



225


DD

PROPOSED FALLS

DRAINAGE CHANNELDC




EXISTING LEVELS

GT GRAVEL TRAP

EXTERNAL WORKS KEY-




RW (150)

2

3

RW (300)

RW (450)

RETAINING WALLS-


66.700

66.700

Notes

DO NOT SCALE.











Keepmoat®

Checked by

Drawn By

Drawing Title

Drawing Number

Revision

Location

Development

Marketing Name

Date Started

Scale @ A1

Date Checked

Smirthwaite Street

Burnley

P1624.ENG008-03

A

P.A.S.

T.M.D.

1:200

May 2015


Item Description

Legend


APPENDIX B

TABLES

The Sirius Group

Stage 1 Generic Assessment Criteria for Soils

Revision:

1% SOM 2.5% SOM 5% SOM 1% SOM 2.5% SOM 5% SOM 1% SOM 2.5% SOM 5% SOM

Metals/MetalloidsArsenic (inorganic) [1]

Cadmium [2]

Chromium (III)

Chromium (VI) [3]

Copper [4]

Lead [5]

Mercury (inorganic) [6]

Nickel [7]

Selenium

Vanadium

Zinc [4]

Other Inorganics

pH

Total Sulphate [8]

Water-Soluble Sulphate [8]

Free Cyanide [9]

Organics

PAHs

Acenaphthene 200 490 920 2000 3600 4900 75000 92000 100000

Acenaphthylene 170 400 760 2000 3600 4900 76000 93000 100000

Anthracene 2300 5300 9400 30000 34000 36000 520000 540000 540000 [10]

Benzo(a)anthracene [10]

Benzo(a)pyrene 2.1 2.1 2.2 2.3 2.3 2.3 27 27 27 [11]

Benzo(b)fluoranthene [10]

Benzo(k)fluoranthene [10]

Benzo(g,h,i)perylene [10]

Chrysene [10]

Dibenzo(a,h)anthracene [10]

Fluoranthene 280 560 820 1500 1600 1600 23000 23000 23000

Fluorene 170 390 730 2200 3400 4000 60000 67000 70000

Indeno(1,2,3-c,d)pyrene [10]

Naphthalene 1.0 2.3 4.6 1.0 2.4 4.7 110 260 510

Phenanthrene 95 220 380 1300 1400 1500 22000 22000 23000

Pyrene 620 1200 1900 3700 3800 3800 54000 54000 54000

BTEX and related

Benzene 0.063 0.13 0.24 0.16 0.30 0.38 15 28 49

Toluene 100 240 460 370 830 1100 33000 68000 110000

Ethylbenzene 26 62 120 34 81 110 3200 7400 14000

Xylenes (total) 28 67 130 33 78 110 3200 7700 15000 [12]

1,2,4-trimethylbenzene 0.22 0.53 1.1 0.24 0.58 1.2 39 93 170

Iso-propylbenzene 6.6 16 32 6.8 17 33 1300 3100 6100

Propylbenzene 21 51 100 23 57 110 3800 9100 17000

Styrene 6.9 16 32 21 49 93 3100 6100 9500

TPH

Aliphatic EC 5-6 24 41 68 24 41 48 2400 4100 6900

Aliphatic EC >6-8 53 110 210 53 110 150 5300 11000 21000

Aliphatic EC >8-10 13 31 61 13 31 43 1300 3100 6000

Aliphatic EC >10-12 62 150 300 62 150 220 6100 15000 28000

Aliphatic EC >12-16 510 1200 2300 510 1200 1700 43000 72000 85000

Aliphatic EC >16-35 41000 70000 90000 42000 70000 80000 >1E6 >1E6 >1E6 [13]

Aromatic EC >5-7 53 110 200 150 300 380 15000 28000 48000

Aromatic EC >7-8 100 240 460 370 820 1100 33000 68000 110000

Aromatic EC >8-10 20 48 94 22 54 75 2200 5200 9800

Aromatic EC >10-12 63 150 290 120 290 400 11000 22000 30000

Aromatic EC >12-16 140 320 570 1100 1900 2100 35000 37000 37000

Aromatic EC >16-21 260 540 840 1800 1900 1900 28000 28000 28000

Aromatic EC >21-35 1100 1500 1700 1900 1900 1900 28000 28000 28000

17th February 2015

34 1400

2400

0.5 g/l

Note

0.5 g/l

34

(mg/kg, unless otherwise stated)

0.5 g/l

<5 or >9 <5 or >9 <5 or >9

2400 2400

410 1200 9000

450 40000 750000

180 180 980

250 430 12000

200 310 2300

40 56 1100

11 85 190

910 4000 8600

Assessed using benzo(a)pyrene as a surrogate marker



Parameter Residential


Commercial / Industrial

37 40 630

With Homegrown Produce Without Homegrown Produce

6.0 6.1 33





200 7100 68000

Revision: 17 February 2015 Page 1

The Sirius Group



Note






Chlorinated Organics

Chlorobenzene 0.19 0.44 0.86 0.19 0.45 0.87 31 71 140

Dichloromethane (DCM) 0.47 0.78 1.2 1.2 1.7 2.4 250 340 470

1,1-dichloroethane (DCA) 1.4 2.4 4.0 1.4 2.4 4.1 260 420 690

1,2-dichloroethane (DCA) 0.0031 0.0048 0.0076 0.0035 0.0053 0.0084 0.34 0.51 0.81

1,1-dichloroethene (DCE) 0.15 0.26 0.45 0.15 0.26 0.46 24 43 74

cis -1,2-dichloroethene (DCE) 0.066 0.12 0.20 0.069 0.12 0.21 14 23 38

trans -1,2-dichloroethene (DCE) 0.11 0.21 0.38 0.12 0.22 0.39 21 37 65

Pentachlorophenol 0.21 0.52 1.0 27 30 31 400 400 400

1,1,1,2-tetrachloroethane 0.56 1.3 2.6 0.63 1.5 2.9 59 140 270

1,1,2,2-tetrachloroethane 0.98 2.1 4.0 1.6 3.4 6.3 150 310 570

Tetrachloroethene (PCE) 0.074 0.17 0.32 0.07 0.17 0.33 10 23 45

Tetrachloromethane (CT) 0.011 0.024 0.046 0.011 0.024 0.046 1.6 3.6 6.9

1,1,1-trichloroethane (TCA) 3.7 7.8 15 3.8 7.9 15 370 770 1400

1,1,2-trichloroethane (TCA) 0.39 0.85 1.6 0.51 1.1 2.0 89 180 320

Trichloroethene (TCE) 0.0070 0.015 0.028 0.0071 0.015 0.68 1.5 2.8 44

Trichloromethane (CF) 0.43 0.80 1.4 0.48 0.89 53 98 170 300

Vinyl Chloride 0.00034 0.00045 0.00062 0.00037 0.00048 0.00066 0.038 0.049 0.068

Miscellaneous Organics

Carbon disulphide 0.066 0.13 0.25 0.066 0.13 0.25 6.7 14 25

Di-(2-ethylhexyl)-phthalate 290 660 1100 3900 4000 4100 85000 85000 8600

MTBE 31 55 94 39 68 120 7400 12000 19000

Phenol 110 190 330 420 440 440 [14]

Methylphenols (cresols), total 78 170 330 5600 8200 9900 160000 170000 18000 [15]

2,4-dimethylphenol (m-xylenol) 18 43 82 200 430 720 15000 23000 28000

Other Parameters

TOC [16]

Calorific Value [17]

Asbestos

Footnotes

[6] The SGV for mercury is based on inorganic mercury which represents the most common form encountered within the environment. This is considered appropriate for most sites as:

“…the SGV for inorganic mercury can normally be compared with chemical analysis for total mercury content because the equilibrium concentrations of elemental and methylmercury

compounds are likely to be very low” (Environment Agency report SC050021/Mercury SGV). Analysis and specific assessment for elemental or methylated forms of mercury will need to be

considered if historical land use or site-specific factors indicate that these forms of mercury are likely to be present.

[7] Toxicological effects by inhalation are localised, therefore the lower of the GAC values for oral and inhalation HCVs have been adopted.

All concentration-based criteria are rounded to 2 significant figures.

The criteria assume a sandy soil type, which will be conservative for the great majority of soils (including made ground) encountered on historically contaminated sites.

Except where otherwise stated, criteria have been derived by Sirius using CLEA version 1.06. Parameters for the land use cases are consistent with those given in Environment Agency

(2009) “Updated Technical Background to the CLEA Model”, report SC050021/SR3 but updated (where relevant) for respiration rate, exposure frequency for dermal contact outdoors, soil

adherence factors for children, and plant uptake concentration factors given in CL:AIRE (2014) and Nathanail et al., (2015). No correction has been made for the “Top Two” crop types in the

Residential with Homegrown Produce land use and the criteria will therefore be conservative in this regard.

Health Criteria Values (HCVs) and (except where specifically noted) chemical property data were obtained from:

• Environment Agency Science Report SC050021 Series;

• Nathanail et al. (2015);

• CL:AIRE-AGS-EIC (2010).

[1] Based on oral GAC as this is the lower GAC and reflects a cancer risk many orders of magnitude greater than for inhalation.

[2] Determined for lifetime exposure. Plant uptake concentration factors applied were as given in CL:AIRE (2014). The GAC values are based on data for soils having a pH value in the

range 6-8; caution should be applied in applying them at pH values outside this range, especially at pH values <5.

[3] Both oral and inhalation HCVs are based on local toxicological effects and therefore the lowest (oral) GAC value is adopted.

[4] For the Residential with Homegrown Produce land use, the GAC values for Cu and Zn are based on potential phytotoxic effects and have been set at the maximum allowable

concentrations for sewage sludge-amended soils presented in the "Sludge (Use in Agriculture) Regulations" (SI 1263/1989); these criteria may also be applied in any land use where plants

are to be grown. The equivalent GAC values for human health protection in the Residential with Homegrown Produce land use are around an order of magnitude greater.

[5] The Category 4 Screening Levels for lead defined in CL:AIRE (2013) have been adopted directly to provide an acceptable basis for initial assessment of data. Where background

concentrations of lead exceed the GAC value, then site-specific evaluation will be required.

3% w/w 3% w/w 3% w/w

440

Fibres present Fibres present Fibres present

2 MJ/kg 2 MJ/kg 2 MJ/kg


The Sirius Group



Note






[17] ICRCL (1986) Guidance Note 61/84, 2nd Edition, Notes on the Fire Hazards of Contaminated Land. Calorific value is not an indication of direct human health risk but may be useful in

assessment of the potential fire risk posed by made ground or natural soils containing elevated concentrations of potentially combustible organic matter.

[12] For screening purposes, a single GAC has been set for total xylene. This is the lowest of the values calculated for the three individual xylene isomers.

[13] “No GAC” indicates that no value has been specified for this land use as the TDSI cannot be exceeded at achievable soil concentrations.

[14] 440mg/kg is the minimum concentration that is protective for direct skin contact with phenol (See Environment Agency SR050021/Phenol SGV) and is adopted where GACs for chronic

exposure are higher.

[15] For screening purposes, a single GAC has been set for total methylphenol. This is the lowest of the values calculated for the three individual methylphenol isomers.

[16] The Hazardous Waste (England and Wales) Regulations 2005. TOC content in itself does not represent a potential risk to human health. This GAC is provided for indicative assessment

of disposal options, in the case that off-site landfill of soil is undertaken. This GAC is specified at the ‘Inert’ waste threshold and should be considered as for information purposes only.

[8] BRE (2005). Sulphate is not considered to pose a potential risk to human health under normal circumstances – this GAC applies to construction cases only and is set at the upper limit

for DS-1 Design Sulphate Class concrete.

[9] GAC calculated for acute risk. Further information can be provided upon request.

[10] The genotoxic PAHs (benz(a)anthracene, benzo(b)fluoranthene, benzo(k)fluoranthene, benzo(g,h,i)perylene, chrysene, dibenz(a,h)anthracene, indeno(1,2,3-c,d)pyrene) are routinely

assessed using benzo(a)pyrene as a surrogate (HPA (2010) “Risk Assessment Approaches for Polycyclic Aromatic Hydrocarbons (PAHs)”, version 5). Separate information on this

approach is provided.

[11] Calculated using a 'minimum risk' oral index dose derived from the application of a 10,000x safety factor to the BMD10 presented in CL:AIRE (2014) for benzo(a)pyrene as a surrogate

marker and the inhalation index dose specified in CL:ARE (2014) and Nathanail et al . (2015). As a conservative measure, the GAC is based on combined exposure pathways to account for

systemic carcinogenic effects. Further information on the derivation can be provided upon request.


The Sirius Group

Stage 1 Threshold Concentrations for Clean Cover Material for Use in Gardens

of Private Residential Properties

1% SOM* 2.5% SOM 5% SOM

Metals/MetalloidsArsenic (inorganic)

Cadmium Soil pH 6-9

Chromium (III)

Copper Based on phytotoxic effect

Lead

Mercury (inorganic)

Nickel

Selenium

Zinc Based on phytotoxic effect

Other Inorganics

pH Must be in range 5-9

Water-Soluble Sulphate

Organics

PAHs**

Total 16 PAHs 100 100 100 Professional judgement

Benzo(a)pyrene 2.1 2.1 2.2 Genotoxic surrogate

Naphthalene 1.0 2.3 4.6

TPH†

Sum of TPH fractions EC5-35 500 500 500 Professional judgement

Aliphatic EC 5-6 24 41 68

Aliphatic EC >6-8 53 110 210

Aliphatic EC >8-10 13 31 61

Aliphatic EC >10-12 62 150 300

Aliphatic EC >12-16 510 1200 2300

Aliphatic EC >16-35 41000 70000 90000

Aromatic EC >5-7 53 110 200

Aromatic EC >7-8 100 240 460

Aromatic EC >8-10 20 48 94

Aromatic EC >10-12 63 150 290

Aromatic EC >12-16 140 320 570

Aromatic EC >16-21 260 540 840

Aromatic EC >21-35 1100 1500 1700

TPH Hazard Index (no units) <1 <1 <1

BTEX‡

Benzene 0.063 0.13 0.24

Miscellaneous Organics

Phenol 270 440 440 440mg/kg is the skin irritation threshold

Other Parameters

Asbestos

Notes:

Soils must have no visual or olfactory evidence of contamination.

‡ Components other than benzene are not genotoxic carcinogens and therefore assessed as part of the TPH mixture.

250

180

<5 or >9

** Soils must meet the specified criteria for each component AND the sum of 16 PAHs. The total is specified to prevent unsuitable

materials being placed as cover. Where an individual PAH is not shown, then its criterion is greater than that for the sum or it is a

genotoxic PAH assessed by using benzo(a)pyrene as a surrogate marker.† Soils must meet the specified criteria for each component and the Hazard Index for TPH must be <1.0. The sum of TPH fractions

must also be met to prevent unsuitable materials being placed as cover. Where an individual TPH fraction has a criterion greater than

that for the sum of TPH fractions, the value is solely provided for the calculation of the Hazard Index.

Fibres present

* Soil organic matter; %SOM = 1.724 * %TOC.

Comment

11


Parameter Threshold Concentration

Based on sandy soil at a range of soil organic matter contents and assuming a standard residential with gardens land use. Alternative

criteria may be specified for other soil types and SOM contents, for soils placed at depth, or for other land uses.

200

450

40

910

37

0.5 g/l

200

Version date: 17 February 2015

Sirius Geotechnical and Environmental Ltd

Suite 2 Russel House 4245 Park Approach Cinnamon House 35 St Pauls Square Mill Road Century Way Cinnamon Park Birmingham Langley Moor Thorpe Park Crab Lane, Fearnhead B3 1QX Durham Leeds Warrington DH7 8HJ LS15 8GB WA2 0XP

t. 0191 378 9972 t. 0113 264 9960 t. 01925 661 700 t. 0121 232 4670 f. 0191 378 1537 f. 0113 264 9962 f. 0191 378 1537 f. 0121 212 3363

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