GEOTECHNICAL ASSESSMENT BURNLEY FOOTCLUB CLUB … Ass… · LTR/15208/002 29th February 2016 Mr...

Consulting Geo‐Environmental Engineers

PWA Geo‐Environmental Ltd

Registered in England

Summit House

Riparian Way

Cross Hills

BD20 7BW

No 06939651

FS560612

Summit House Riparian Way, The CrossingsCross Hills Keighley West Yorkshire BD20 7BW Tel. 01535 633350

E‐mail [email protected] www.pwageo.co.uk www.pwaite.co.uk

LTR/15208/002

29th February 2016

Mr James Webber

Barnfield Construction Ltd

Kenyon Road,

Lomeshaye Industrial Estate,

Nelson

BB9 5SP

Dear James,

GEOTECHNICAL ASSESSMENT BURNLEY FOOTCLUB CLUB SHOP, TURF MOOR

PWA Geoenvironmental Limited (PWAG) have been instructed by Barnfield Construction Ltd to

undertake a geotechnical assessment for the proposed new Club Shop located at Burnley

Football Club ground (Turf Moor) in Burnley and provide outline foundation recommendations.

Report Limitations

This report has been prepared for the sole use of the client (named above) and PWA Geo‐

Environmental Ltd accept no liability for any use of this document other than by the client and

only for the purpose stated in the document for which is was prepared and provided. All

reasonable skill, care and diligence has been applied in examining the information obtained.

However, PWA Geo‐Environmental Ltd accepts no responsibility for inaccuracies in the data

supplied or for opinions based on any such inaccurate data.

Background

Burnley Football Club are redeveloping their club shop located at their Turf Moor football

ground. Barnfield Construction have been appointed as main contractor for the construction

of the new shop. The new shop will cover the footprint of the former club shop and therefore

access to undertake any ground investigations was not possible until the demolition of the

existing building.

Site Description

The site is located to the north of Harry Potts Way, around 700m to the east of Burnley City

Centre and covers an area of approximately 250m2. The Burnley Football Club shop is located

within the south‐eastern corner of Burnley FC’s stadium (Turf Moor), adjacent to Brunshaw

Road. A site location plan is presented in drawing No. 15208/G/150 and is attached as

Enclosure 1.

Site History

The site was undeveloped rural land, until 1893, when Turf Moor Football and Cricket Grounds

were established. Bee Hole Colliery is shown close to the northeast side of the site, until 1960,

when it is no longer recorded. During the 20th Century, various stands and shelters have been

built around the football ground, until the most recent configuration was settled on in 2001.

Historic OS maps dating from 1893 show a small built structure within the south‐eastern

corner of the site. Anecdotal evidence suggests that the groundsman hut previously occupied

the site of the Burnley Football Club Shop within the south‐eastern corner of the site.

Published Geology

The 1:50,000 scale geological maps indicate that the site is directly underlain by Superficial

Deposits comprising Glacial Till. The solid geology which is anticipated to be present at depth

beneath the site is shown as sandstone from the Pennine Lower Coal Measures Formation.

Fieldwork

The fieldwork was undertaken on 11th February 2016 and comprised 3 Nº machine excavated

trail pits to a depth of 2.0m bgl. The trial pits were located within the footprint of the new

club shop. The trial pitting was undertaken under the full time supervision of a geotechnical

engineer from PWAG.

Hand Shear Vane Tests were undertaken at regular intervals where appropriate and results

detailed on the exploratory logs.

A limited number of representative samples were taken for geotechnical testing and were

sent to Professional Soil Laboratory Limited for testing to allow the volume change potential

and concrete classification to be assessed.

Ground Conditions

In general the ground conditions encountered during the trial pitting reflected those detailed

within the published geology. A summary of the ground conditions encountered during this

site investigation is outlined below and a copy of the exploratory hole logs and exploratory

hole location plan are attached.

It should be noted that the demolition of the former club shop had been completed and the

demolition works revealed a 450mm clay surface water sewer which runs northwest to

southeast across the site.

Made Ground

Made Ground was encountered across the site from ground level to a depth of between

0.30m to 0.5m below existing site levels and generally comprised dark brown slightly gravelly

sandy clay to slightly gravelly clayey sand with rare brick.

Glacial Till

Glacial Till was encountered directly beneath the Made Ground and generally comprised firm

light orange brown mottled grey medium to high strength slightly gravelly sandy to very sandy

Clay recorded to a depth of between 1.10m to 1.30m below existing site levels. Hand Shear

Vane tests within this strata recorded shear strength values of between 40 to 72kPa.

A Plasticity Index of 19% was recorded in this material which corresponds to a soil with an

intermediate plasticity. A Modified Plasticity Index value of 15.39 %has been calculated,

corresponding to a soil with a low volume change potential.

The above was generally found to be underlain by a firm brown to dark grey brown medium

to high strength slightly sandy to very sandy Clay with rare gravel and pockets of fine to

medium sand proven to a depth of 2.0m below existing site levels. Hand Shear Vane tests

within this strata recorded shear strength values of between 40 to 72kPa.

A Plasticity Index of between 17% and 20% was recorded in this material which corresponds

to a soil with an intermediate plasticity. A Modified Plasticity Index value of 16.6 % and 18%

has been calculated, corresponding to a soil with a low volume change potential.

Groundwater

No groundwater was encountered within the trial pit excavations and it is anticipated that any

potential groundwater seepage encountered during excavation could be dealt with by sump

pumping.

Foundation Solution and recommendations

Based on the above findings foundation loads should be limited to 100kN/m2 within the firm

orange brown mottled grey clays of the Glacial Till present at depth of between 0.3m and

0.5m below existing ground level. This will limit total settlements to less than 25mm with

differential settlement half of this value.

Any new foundations should be designed so that they do not increase loading on the 450mm

surface water sewer which runs across the site.

It is anticipated that a ground floor slab solution can be adopted for the development on‐site,

subject to the removal of the Made Ground and replacement with granular fill and subject to

the following criteria being satisfied:

the foundation depth (such as due to the influence of trees) is less than 1.5m;

any fill is suitable, well‐compacted granular material and less than 600mm thick, and;

it is demonstrated that desiccation is not present and soils are at their equilibrium

moisture content.

Prior to the placement of the founding materials and the construction of the ground bearing

floor slab, the sub‐formation and formation will need to be inspected and checked by a

geotechnical engineer to ensure the ground conditions are as expected. This is likely to

include appropriate testing, carried out in accordance with the DMRB IAN 73/06, sufficient to

confirm the ground conditions at time of construction are consistent with the previous design

parameters derived from this ground investigation.

If low bearing and soft strata are identified at the formation, this should be reported to the

Geotechnical Engineer immediately and remedial actions agreed.

If ground conditions differ from those reported PWA Geoenvironmental Limited should be

contacted immediately for advice.

Foundation excavations should be protected and it is recommended that foundations are

poured immediately after excavation or footings blinded with lean mix concrete.

Concrete Classification

The four samples of Glacial Till analysed recorded pH values of between 6.9‐7.1 and 2:1 Water

Soluble Sulphate concentrations of between 19 and 36mg/l. In accordance with BRE Special

Digest 1 for a brownfield site with static groundwater this equates to a concrete design class

of DS‐1 AC‐1s.

If you have any questions regarding the above please do not hesitate to contact us.

Yours Sincerely

David Kitching

For and on behalf of PWA Geoenvironmental Ltd

Encs;

Site Location Plan

Exploratory Hole Location Plan

Exploratory Hole Logs

Geotechnical Laboratory Results

Project No: 15208 Project Details: Burnley FC Club Shop Date: February 2016

Site Location Plan

m F'!Ub:I Clib

5208-C -• 50 /.... -


Trial Pit Location Plan

Project Id:

Project Title:

Location:

Client:

15208

Club Shop BFC

Harry Potts Way, Burnley, BB10 4BZ

Barnfirld Construction

Title:

Scale:

Engineer:

Contractor:

Site Plan

1:500

Richard Caine

PWA Geo-Environmental


Trial Pit Logs


Geotechnical Laboratory Results

5 – 7 Hexthorpe Road, Hexthorpe, Doncaster DN4 0AR tel: +44 (0)844 815 6641 fax: +44 (0)844 815 6642 e-mail: [email protected] [email protected]

A copy of the Laboratory Schedule of accredited tests as issued by UKAS is attached to this report. This certificate is issued in accordance with the accreditation requirements of the United Kingdom Accreditation Service. The results reported herein relate only to the material supplied to the laboratory. This certificate shall not be reproduced in full,

without the prior written approval of the laboratory.

Checked and Approved Signatories: R Gunson A Watkins R Berriman (Director) (Director) (Quality Manager) D Lambe S Royle L Knight

(Senior Technician) (Senior Technician) (Senior Technician) Page 1 of

LABORATORY REPORT

4043

Contract Number: PSL16/0717

Report Date: 23 February 2016 Client’s Reference: Client Name: PWA Geoenvironmental

2 The Calls Leeds West Yorkshire LS2 7JU

For the attention of: David Kitching Contract Title: Burnley FC Club Shop

Date Received: 17/2/2016 Date Commenced: 17/2/2016 Date Completed: 22/2/2016 Notes: Opinions and Interpretations are outside the UKAS Accreditation

* Denotes test not included in laboratory scope of accreditation $ Denotes test carried out by approved contractor

PSL001 Issue 2 Nov 15 Page of .

Hole Sample Sample Top Base

Number Number Type Depth Depth m m

TP1 D 1.20 Brown sandy very silty CLAY.TP3 D 0.80 1.00 Brown gravelly sandy very silty CLAY.TP3 D 1.50 1.60 Brown gravelly sandy very silty CLAY.TP2 D 1.50 1.60 Brown sandy very silty CLAY.

Checked / Approved Date 22/02/16 Contract No:

PSL16/0717

Client Ref:

4043

SUMMARY OF LABORATORY SOIL DESCRIPTIONS

Description of Sample

Burnley FC Club Shop


(BS1377 : PART 2 : 1990)

Moisture Linear Particle Liquid Plastic Plasticity PassingHole Sample Sample Top Base Content Shrinkage Density Limit Limit Index .425mm Remarks

Number Number Type Depth Depth % % Mg/m3 % % % %m m Clause 3.2 Clause 6.5 Clause 8.2 Clause 4.3/4 Clause 5.3 Clause 5.4

TP1 D 1.20 20 38 21 17 100TP3 D 0.80 1.00 20 42 23 19 81TP3 D 1.50 1.60 24 43 23 20 83TP2 D 1.50 1.60 26 40 22 18 100

SYMBOLS : NP : Non Plastic * : Liquid Limit and Plastic Limit Wet Sieved.

Date 22/02/16

4043

SUMMARY OF SOIL CLASSIFICATION TESTS

Intermediate plasticity CI.

Intermediate plasticity CI.Intermediate plasticity CI.Intermediate plasticity CI.

Client Ref:

Contract No:

PSL16/0717

Checked / Approved



(BS5930 :2015)

Date 22/02/16

4043


Checked /Approved Contract No:

PSL16/0717

Client Ref:

PLASTICITY CHART FOR CASAGRANDE CLASSIFICATION.

0

10

20

30

40

50

60

70

80

90

0 10 20 30 40 50 60 70 80 90 100 110 120 130

Plas

ticity

Inde

x (P

I%).

Liquid Limit (LL%).

CL CI CH CV CE

ML MI MH MV ME

Client

Our Reference

Client Reference

Order No

Contract Title

Description

Date Received

Date Started

Date Completed

Test Procedures

Notes

Approved By

Rob Brown

Identified by prefix DETSn (details on request).

Opinions and interpretations are outside the scope of UKAS accreditation. This

certificate is issued in accordance with the accreditation requirements of the United

Kingdom Accreditation Service. The results reported herein relate only to the material

supplied to the laboratory. Observations and interpretations are outside the scope of

ISO 17025. This certificate shall not be reproduced except in full, without the prior

written approval of the laboratory.

Business Manager

(not supplied)


4 Soil samples.

19-Feb-16

19-Feb-16

24-Feb-16

Certificate of AnalysisCertificate Number 16-58628

24-Feb-16

Professional Soils Laboratory Ltd

5/7 Hexthorpe Road

Hexthorpe

DN4 0AR

16-58628

PSL16/0717

Derwentside Environmental Testing Services LimitedUnit 2, Park Road Industrial Estate South, Consett, Co Durham, DH8 5PY

Tel: 01207 582333 • email: [email protected] • www.dets.co.uk Page 1 of 3 .

Summary of Chemical AnalysisSoil Samples

Our Ref 16-58628Client Ref PSL16/0717

Contract Title Burnley FC Club ShopLab No 944756 944757 944758 944759

Sample ID TP1 TP3 TP3 TP2Depth 1.20 0.80-1.00 1.50-1.60 1.50-1.60

Other IDSample Type D D D D

Sampling Date n/s n/s n/s n/s

Sampling Time n/s n/s n/s n/s

Test Method LOD Units

DETSC 2008# 7.1 6.9 7.0 7.1DETSC 2076# 10 mg/l 19 32 36 34

pHSulphate Aqueous Extract as SO4

Inorganics

Page 2 of 3Key: # -MCERTS (accreditation only implied if report carries the MCERTS logo). n/s -not supplied.

Information in Support of the Analytical ResultsOur Ref 16-58628

Client Ref PSL16/0717Contract Burnley FC Club Shop

Containers Received & Deviating Samples

Lab No Sample ID

Date

Sampled Containers Received Holding time exceeded for tests

Inappropriate

container for

tests944756 TP1 1.20 SOIL PT 500ml Sample date not supplied

944757 TP3 0.80-1.00 SOIL PT 500ml Sample date not supplied



Soil Analysis NotesInorganic soil analysis was carried out on a dried sample, crushed to pass a 425µm sieve, in accordance with BS1377.

Organic soil analysis was carried out on an 'as received' sample. Organics results are corrected for moisture and expressed on a dry weight basis.

The Loss on Drying, used to express organics analysis on an air dried basis, is carried out at a temperature of 28°C +/-2°C.

DisposalFrom the issue date of this test certificate, samples will be held for the following times prior to disposal :-

Soils - 1 month, Liquids - 2 weeks, Asbestos (test portion) - 6 months

Key: P-Plastic T-Tub

DETS cannot be held responsible for the integrity of samples received whereby the laboratory did not undertake the sampling. In this instance samples received may

be deviating. Deviating Sample criteria are based on British and International standards and laboratory trials in conjunction with the UKAS note 'Guidance on

Deviating Samples'. All samples received are listed above. However, those samples that have additional comments in relation to hold time and/or inappropriate

containers are deviating due to the reasons stated. This means that the analysis is accredited where applicable, but results may be compromised due to sample

deviations. If no sampled date (soils) or date+time (waters) has been supplied then samples are deviating. However, if you are able to supply a sampled date (and

time for waters) this will prevent samples being reported as deviating where specific hold times are not exceeded and where the container supplied is suitable.

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