Bodmin Jail Redevelopment

Mallino Developments

Bodmin Jail Redevelopment

Bodmin Town Leat Repair Report

ARUP-C-RP-0010

Issue 3 | 26 March 2018

This report takes into account the particular

instructions and requirements of our client.

It is not intended for and should not be relied

upon by any third party and no responsibility

is undertaken to any third party.

Job number 253391

Ove Arup & Partners Ltd

63 St Thomas Street

Bristol BS1 6JZ

United Kingdom

www.arup.com

Mallino Developments Bodmin Jail Redevelopment


ARUP-C-RP-0010 | Issue 3 | 26 March 2018

\\GLOBAL\EUROPE\BRISTOL\JOBS\253XXX\253391-00\4.70_DESIGN_NOTES\03 INFRASTRUCTURE\BODMIN TOWN LEAT\ARUP-C-RP-0010 BODMIN JAIL - BODMIN TOWN

LEAT CCTV SURVEY REPORT_ISSUE 2.DOCX

Contents Page

1 Introduction 1

1.1 Introduction 1

1.2 The Works 1

1.3 Contact Details 2

1.4 Reference Documents 3

2 Bodmin Town Leat 4

2.1 Flood Risk 4

3 Discussion on Existing Condition 6

3.1 CCTV Survey 6

4 Recommended Remediation Work 7

4.1 Culvert replacement 7

4.2 Hydromorphology and ecology improvements 7

4.3 Reduction of flood risk 7

4.4 Specification 8

4.5 Health and Safety 8

4.6 Cost assessment 8

5 Permitting, Consents and Approvals 9

5.1 South West Water 9

5.2 Environment Agency 9

5.3 Planning 10

Appendices

Appendix A

CCTV Survey Outputs

Appendix B

Recommended Remediation Works

Appendix C

South West Water & Environment Agency Records

Appendix D

Designers Risk Assessment

Appendix E






Cost Estimate






Page 1

1 Introduction

1.1 Introduction

The Bodmin Jail Redevelopment aims to refurbish the existing Victorian Grade II

listed jail house buildings into a new hotel and visitor attraction.

Arup has been appointed by Mallino Development Ltd to provide civil

engineering design advice for the refurbishment works.

As part of these works, the client has been asked to schedule repairs to the

culverted Bodmin Town Leat that runs through the lower part of the Berrycombe

Vale site.

1.2 The Works

The following report covers the following aspects of the remedial works to the

culverted watercourse. It comprises:

• Discussion on the existing condition of the asset;

• Results of CCTV surveys;

• Discussions on remedial works;

• Recommended further works.






Page 2

1.3 Contact Details

Project name Bodmin Jail Redevelopment Project

Project ref Arup Project Reference 253391

Planning Application Reference

PA17/00086

Address Bodmin Jail, Berrycoombe Road, Bodmin, Cornwall, PL31 2NR

Principal Designer (Architect)

Name Twelve Architects

Address 148 Tooley Street, 5th Floor, SE1 2TU

Contact name Hannah Baker/ Lorraine Stout Griffith

Telephone 0207 846 2012 Email [email protected]

Project Manager and Quantity Surveyor

Name Turner & Townsend project management

Address One Castlepark Tower Hill, Bristol, BS2 0JA

Contact name Phil Toghill / Rob Cox


Engineer

Name Arup

Address 63 St Thomas Street Bristol BS1 6JZ United Kingdom

Contact name Andrew Rolf / Charles Bennett







Page 3

1.4 Reference Documents

This document is to be read with the following documents:

• Preliminaries provided by the Project Manager

• Pre-contract H&S plan provided by the Principle Designer

• Sewers for Adoption 7th Edition. ‘Part E – Civil Engineering Specification’ of Sewers for Adoption 7th Edition shall be used as the specification for all construction works.






Page 4

2 Bodmin Town Leat

Bodmin Town Leat is a tributary of the River Camel that rises in the Castle

Canyke area to the east of Bodmin and flows west through Bodmin town centre,

joining the River Camel approximately 1.5 km west of Bodmin.

Bodmin Town Leat has been heavily modified since medieval times, and runs

below ground in pipes and culverts along much of its length.

The extent of the Leat under consideration is shown below and extends from an

existing manhole (east) to the ‘silt traps’ (west).

Figure 1 – Route of culverted watercourse through the site

Bodmin Town Leat as it runs through the site is a 1200mm diameter precast

concrete culvert. The culvert is known to be in poor condition. A CCTV survey

has been undertaken to assess the condition of the existing culvert and identify

potential remediation works (see Section 3).

2.1 Flood Risk

The Bodmin Town Leat catchment has been identified by the EA as ‘red’ problem

catchment and as a Critical Drainage Area. This is attributable to a combination of

the steep, flashy catchment and the constrained, culverted nature of the

watercourse through Bodmin town centre.

The areas adjacent to the Bodmin Town Leat are at raised probability of flooding,

as shown in the extract of the EA fluvial flood map (Figure 2).






Page 5

Figure 2

A flood alleviation scheme was constructed in the early 2000s. This included

measures to remove restrictions in the culverted sections of the watercourse and

construction of a flood storage area in the Priory Grounds area to seek to reduce

flood risk in the town centre. However, a high residual risk remains.






Page 6

3 Discussion on Existing Condition

As part of the contractual conditions for the transfer of land at Berrycombe Vale it

is understood that Bodmin Town Council have requested a schedule of works for

the Bodmin Town Leat that runs from east to west through the Berrycombe site.

3.1 CCTV Survey

Two independent CCTV surveys have been undertaken over the section of the

Leat crossing the site. Both surveys were partial, covering different extents of the

Leat / Culvert.

When combined the two surveys provide a complete picture of the condition of

the culverted watercourse within the Berrycombe Vale site.

3.1.1 Exjet, October 2016

This survey was provided to Mallino Developments and is understood to have

been commissioned by Bodmin Town Council.

CCTV survey of the Bodmin Town Leat culvert was undertaken by Exjet Services

Ltd in October 2016. The results of this survey are included in Appendix A.

The survey was progressed from Manhole 0401 to Manhole 4316. These being

located to the west of the development site. Surveys were progressed down-stream

from Manhole 0401 and up-stream from Manhole 4316.

Manhole 0401 has a depth of circa 2.86m from cover level. Manhole 4316 has a

depth of circa 3.12m from cover level.

The section of culvert between Manholes 0401 and 4316 was found to be in very

poor condition throughout. A section located circa 80m from Manhole 0401 has

fully collapsed preventing full survey.

3.1.2 Solum, March 2018

This survey was commissioned by Mallino Development Ltd in March 2018.

Solum Surveying Ltd undertook a new CCTV survey in March 2018. The results

of this survey are included in Appendix A.

The survey extended upstream from Manhole 4316 towards the collapsed section.

The results concur with the previous 2016 survey, finding the majority of the

culvert in very poor condition.

An additional length of survey was conducted upstream from Manhole 4316, to

the east of the site (adjacent to No. 145 – No. 150 Hillside Park). This section of

culvert was shown to be in good condition.

The findings of the survey are summarised on BJH-ARP-XX-XX-DR-CD-1201

included in Appendix B.






Page 7

4 Recommended Remediation Work

4.1 Culvert replacement

Based on the survey information received for the section of culvert between

Manhole 0401 and 4316, it is recommended that a c290m length of the culvert is

replaced.

Subject to further consultation with the Environment Agency, it is suggested

this could be with a replaced with a similar culvert section to the existing (i.e. a

new 1200mm diameter culvert). The culverts up and down-stream are both of

similar diameter.

A typical section of the proposed replacement is culvert is included on BJH-ARP-

XX-XX-DR-CD-1201 in Appendix B.

The new culvert would be constructed alongside the existing culvert (i.e. offline)

to avoid the need for significant temporary pumping. Temporary pumping would

be required to make the final connections.

4.2 Hydromorphology and ecology improvements

Bodmin Town Leat is identified in the Environment Agency (EA) records as a

Statutory Main River.

The EA have duties to supervise all matters relating to flood defence on Main

Rivers and to promote conservation of the aquatic environment.

As such, the EA may identify that they seek hydromorphological and ecological

improvements as part of the remediation of the culvert. These may include:

• Daylighting of the culvert (i.e. replacing with an open watercourse). This is

the EA’s preferred approach for culverted watercourses, however given the

depth of the culvert (c.2.8m depth) it may not be a feasible approach for the

Berrycombe Vale site.

• A modified culvert section to include, for example, habitat ledges or low flow

channels, to improve the biodiversity of the culverted section.

The EA requirements and preferences with regard to hydromorphology and

ecology will need to be confirmed through consultation.

4.3 Reduction of flood risk

As discussed in Section 2.1, there is a high probability of flooding in parts of

Bodmin from the Bodmin Town Leat.

As a result, Bodmin Town Council, Cornwall Council (as Lead Local Flood

Authority) and the EA may wish to seek opportunities to reduce flood risk as part

of the culvert replacement works.






Page 8

Detailed hydrological assessment would be needed to assess whether

opportunities for flood risk reduction exist, however it is believed that the flood

risk is mainly attributable to the limited conveyance capacity at pinch points in

Bodmin town centre. As such, increasing conveyance through the Berrycombe

Vale site would be unlikely to provide significant betterment.

As above, the EA requirements and preferences with regards to flood risk

reduction will need to be confirmed through consultation.

4.4 Specification

All construction work should be undertaken in accordance with Sewers for

Adoption 7th Edition. ‘Part E – Civil Engineering Specification’ of Sewers for

Adoption 7th Edition shall be used as the specification for all construction works.

4.5 Health and Safety

The assessment, design and construction of any works in relation to the culvert are

to be undertaken in accordance with all relevant health and safety legislation,

including the Construction (Design and Management) Regulations 2015 (CDM

2015).

It is assumed that the works to the culvert will be undertaken as part of the wider

redevelopment works at the site.

A CDM Designers Risk Assessment is included in Appendix D. In this document

we have identified the key hazards relating to the proposed culvert works and

identified measures to, where possible, eliminate these risks and reduce or control

any risks that cannot be eliminated.

4.6 Cost assessment

Turner and Townsend have undertaken an estimate of the cost of replacement of

the culvert. This estimate is based on the following assumptions:

• The culvert is replaced on a like-for-like basis, with a new 1200mm

diameter precast concrete culvert;

The estimated replacement cost is c£500,000. A breakdown of this cost estimate is

included in Appendix E.






Page 9

5 Permitting, Consents and Approvals

5.1 South West Water

Bodmin Town Leat is currently shown on the South West Water asset records as a

public sewer. This was confirmed by email by Martyn Dunn of South West

Water. These records are included in Appendix C.

If this is correct, then the responsibility for repair, maintenance and assessment of

the culvert lie with South West Water and would be unaffected by change of

ownership of the land above.

However, it is understood that South West Water believe the culvert is incorrectly

designated as a public sewer. As a result they intend to update their records in the

coming months to remove this from their asset records.

If this is the case, then the responsibility for repair and maintenance of the culvert

will lie with the owner of the land above the culvert in accordance with standard

riparian responsibilities.

5.2 Environment Agency

Regardless of the SWW status, as a Main River, a Flood Risk Activity

environmental permit from the EA is required for any works that could have

impact on flood risk. This includes:

• Altering, repairing or maintaining any temporary or permanent structure in,

over or under a Main River, where the work could affect the flow of water in

the river or affect any drainage work;

• Any activity within 8m of the bank of a Main River;

• Any activity within 8m of any flood defence structure or culvert on a Main

River.

The proposed works are not covered under the list of Exempt Activities or the

activities covered by a Standard Rules permit and therefore a Bespoke Permit will

be required.

The requirements for a Bespoke Permit will depend on the EA’s specific

requirements. However, there requirements are likely to include:

• Detailed method statement for the proposed works (including enabling /

temporary works);

• Programme for undertaking the works;

• Construction drawings for the proposed works;

• Environmental risk assessment. This may require the undertaking of

ecological surveys to identify the current baseline condition of the

watercourse;

• Construction Environmental Management Plan.






Page 10

The EA may also identify alternative design preferences for the replacement

culvert to improve the ecological potential of the culvert as discussed in Section

4.2.

The starting position for the EA is that where possible, opportunities should be

sought to ‘daylight’ existing culverts. As discussed above, given the depth of the

culverted watercourse (2.5m – 3.0m deep) this would be challenging to achieve on

the Berrycombe Vale site.

5.3 Planning

Advice from a planning consultant should be sought to determine if the proposed

works are covered under the current Bodmin Jail planning application or if a new

planning application or amendment is required for these works.

Appendix A

CCTV Survey Outputs

EX

MH

3

EX

MH

2

EX

MH

1

Unplo

tted

EX

MH

4

Unplo

tted

EX

MH

5

94

93

79

80

Elm

65

60

Grove

Trelane

10

7

TC

B

22

1

WA

TE

RY

LA

NE

79.8

m

1 Hil

lH

ou

se

Wo

rk

s

1

CARDELL ROAD

Post

Flaxmoor

Terr

144

35

112

El Sub

Sta

127

142

145

120

94.6

m

72

66

HILLSIDE P

AR

K

73

88

Sub S

ta

El

46

87

7

102

106

Arw

eth

76

.1m

Tressa

Ell

esm

ere

83.9

m

Hil

lfie

ld

31

30

Clifden

Terrace

18

113

COR

NER

3

27

23

4

7

AR

MC

HAIR

1

14

128

134

135

4

98

101

HILLSI

DE PARK

72

.1m

Cross

Crossw

ays

31a

Ho

use

The Co

ach

The

Governor

s

House

Chapla

incy

11

14

8

12

86.4

m

4

107

Path

65.2

m

150

LB

TA

NW

OO

D

VIE

W

27

15

2

11a

97

59

56

78.7m

72.2m

HILL

119

18

10

20

28

TANWOOD VIEW

18a

52

55

41

46

141

36

28

24

46

35b

Po

nd

35a

14

BERRYCOOMBE

22

Berryco

mbe

House

1111a

SHER

WO

OD

DRIV

E

44

36

24

2

12

BERR

YC

OO

MBE

VALE

42

38

13

59.5

m 1 to 11

30

El S

ub

S

ta

3264.1

m

Path

(u

m)

ED Bdy

11

SC

ARLETTS

WELL R

OA

D

1

35

SC

ARLETTS

WELL P

AR

K

8

22

19

29

27

60

.0m

4

Car P

ark

1

Su

b

El

12

14

Sta

46

5

CA

MEL

84

45

52

20

16

81

COURT

10

22

21

1

64.4

m

38 to 44

22

35

24

26

DYMOND COURT

23

10

16

17

43

Cran

bo

rn

e

NORW AY ROAD

51

3

29

Sitka L

odge

1

289

.1m

Beechcroft

Ho

use

SE

WE

R IN

PO

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DIA

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OR

KS

RE

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IRE

D.

CL

~60

.0IL

~57

.1D

epth

= 2

.86

CL

~64

.5IL

~61

.4D

epth

= 3

.12

App

rox.

Col

laps

ed s

ewer

Leng

th o

f sew

er s

ubje

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de

form

atio

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ures

thro

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ut

Leng

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form

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ract

ures

thro

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Bod

min

Jai

l (25

3391

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P-C

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-100

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18 |

Inf

orm

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CJB

Bod

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Tow

n Le

atC

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V S

urve

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indi

ngs

NO

TES.

1. S

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S C

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:(i)

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JET

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(ii) S

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RC

H 2

018

SOLUM SURVEYING LTD THE OLD STABLES

PINES COURTYARD, STONETel: 01454413592

Fax: Email: [email protected]

Project-informationProject name : Project Number : Contact : Date :

BODMIN JAIL 08 03 18 13/03/2018

BODMIN JAIL 08 03 18 // Page: 1

Client:Contact Name:Department:Road:Town:County:Telephone:Fax:Mobile:E-mail:

ARUPCHARLES BENNETTSENIOR EGINEERST THOMAS STREETBRISTOL

0117 976 5432

0746 4488 [email protected]

Site:Contact Name:Department:Road:Town:County:Telephone:Fax:Mobile:E-mail:

BODMIN JAILCHARLES BENNETTSENIOR ENGINEERSCARLETTS WELL ROADBODMIN

ContractorContact Name:Department:Road:Town:County:Telephone:Fax:Mobile:E-mail:

SOLUM SURVEYING LTDSTEVE HOLBROOKOPERATIONS MANAGERTHE OLD STABLESPINES COURTYARD, STONEBERKELEY GL13 9LE01454413592

[email protected]


Street : PINES COURTYARD, STONETel: 01454413592


Inspection reportDate : Job number : Weather : Operator : Section number : PLR SUFFIX:

Weather Vehicle : Camera : Preset : Cleaned : Operator :

Place : Location details: U/S MH :Road : Catchment: U/S Depth :Location Tape number : D/S MH :Inspection Pipe Length D/S Depth :

Use: Pipe shape :Year laid : Pipe size :Purpose : Pipe material :Total length : Lining :

Comment :

13/03/2018 no rain or snow 1 X

no rain or snow VEHICLE 1 SOLO PRO

BODMINSCARLETTS WELL ROAD

EXMH1 (D/S) EXMH2

EXMH1

EXMH2

Surface water

Routine inspection of condition81.81 m

1200 mmConcrete

1:645 Position Code Observation Grade


0.00 MH (Constr) 0Start node type, manhole, reference number :EXMH1

0.01 WL (Serv) 0Water level, 10% of the vertical dimension

3.73 CN (Constr) 0Connection other than junction, at 11 o'clock,diameter 100mm

9.69 CN (Constr) 0Connection other than junction, at 10 o'clock,diameter 100mm

81.81 MHF (Constr) 0Finish node type, manhole reference number:EXMH2

EXMH1

EXMH2

STR no def STR peak STR mean STR total STR grade SER no def SER peak SER mean SER total SER grade0 0 0 0 1 0 0 0 0 1

Structural DefectsService Defects

Constructional FeaturesMiscellaneous Features


Street : PINES COURTYARD, STONETel: 01454413592




Place : Location details: U/S MH :Road : Catchment: U/S Depth :Location Tape number : D/S MH :Inspection Pipe Length D/S Depth :

Use: Pipe shape :Year laid : Pipe size :Purpose : Pipe material :Total length : Lining :

Comment :

13/03/2018 no rain or snow 2 X


BODMINSCARLETTS WELL ROAD

EXMH2 (D/S) EXMH3

EXMH2

EXMH3

Surface water

Routine inspection of condition177.14 m

1200 mmConcrete



0.00 MH (Constr) 0Start node type, manhole, reference number :EXMH2

0.00 FL (Struct) 3Fracture, longitudinal, at 12 o'clock

0.00 WL (Serv) 0Water level, 10% of the vertical dimension

0.00 S01 CUW (Misc) 0Loss of vision, camera under water, Start

16.40 F01 CUW (Misc) 0Loss of vision, camera under water, End

16.40 S02 FM Fracture, multiple, from 8 to 4 o'clock, Start

48.20 S03 D (Struct) 2Deformed sewer/drain, 5%, Start

54.20 F03 D (Struct) 2Deformed sewer/drain, 5%, End

54.20 S04 D (Struct) 4Deformed sewer/drain, 10%, Start

76.10 F02 FM (Struct) 4Fracture, multiple, from 8 to 4 o'clock, End

76.10 F04 D (Struct) 4Deformed sewer/drain, 10%, End

76.10 S05 CL (Struct) 2Crack, longitudinal, at 12 o'clock, Start

85.50 CL (Struct) 2Crack, longitudinal, at 8 o'clock

90.60 F05 CL (Struct) 2Crack, longitudinal, at 12 o'clock, End

90.60 S06 CM Cracks, multiple, from 8 to 4 o'clock, Start

EXMH2


PINES COURTYARD, STONETel: 01454413592


Inspection ReportDate : Job number : Weather : Operator : Section number : PLR :

Weather Vehicle : Camera : Preset : Cleaned : Grade:13/03/2018 no rain or snow 2 X




112.20 FL (Struct) 3Fracture, longitudinal, at 12 o'clock

120.20 F06 CM (Struct) 3Cracks, multiple, from 8 to 4 o'clock, End

120.20 S07 FL Fracture, longitudinal, at 12 o'clock, Start


136.00 F08 FL (Struct) 3Fracture, longitudinal, at 9 o'clock, End

151.30 CL (Struct) 2Crack, longitudinal, at 4 o'clock

154.40 F07 FL Fracture, longitudinal, at 12 o'clock, End

154.40 S09 FM Fracture, multiple, from 7 to 5 o'clock, Start

158.00 IR (Serv) 0Infiltration, running, at 9 o'clock

168.10 F09 FM (Struct) 4Fracture, multiple, from 7 to 5 o'clock, End







177.10 SA (Misc) 0Survey abandoned OUT OF REEL

STR no def STR peak STR mean STR total STR grade SER no def SER peak SER mean SER total SER grade

Structural DefectsService Defects

Constructional FeaturesMiscellaneous Features

Exjet Services

Exjet House, Torbay Business Park

30 Woodview Road, Paignton

Tel: 01803 557000

Fax: 01803 559556

Email: [email protected]

Project-informationProject name : Project Number : Contact : Date :

33875. BODMIN TOWN LEAT, BERR 33875/16 Anne Banks 21/10/2016

33875. BODMIN TOWN LEAT, BERRYCOOMBE RD, BODMIN.

Client:

Contact Name:

Department:

Road:

Town:

County:

Telephone:

Fax:

Mobile:

E-mail:

Bodmin Town Council

Anne Banks

Shire House

Mount Folly Square

Bodmin

Cornwall PL31 2DQ

01208 76616

[email protected]

Site:

Contact Name:

Department:

Road:

Town:

County:

Telephone:

Fax:

Mobile:

E-mail:

Berrycombe Road

Bodmin

Contractor

Contact Name:

Department:

Road:

Town:

County:

Telephone:

Fax:

Mobile:

E-mail:

Exjet Services

Mr Dave Longley



Devon, TQ4 7HP

01803 557000

01803 559556

[email protected]

Exjet Services


Street : 30 Woodview Road, Paignton

Tel: 01803 557000

Fax: 01803 559556




Place : Location details: U/S MH :

Road : Catchment: U/S Depth :

Location Tape number : D/S MH :

Inspection Pipe Length D/S Depth :

Use: Pipe shape :

Year laid : Pipe size :

Purpose : Pipe material :

Total length : Lining :

Comment :

21/10/2016 33875/16 no rain or snow SW 1 X

no rain or snow WF65XPT camera 2 yes SW

BODMIN.

BERRYCOOMBE ROAD.

Fields

MH.0401. (D/S) MH.4316.

1

MH.0401.

2.86

MH.4316.

Culverted watercourse

Z

Sample survey to determine asset condition

190.43 m

Circular

1200 mm

Concrete

1:792 Position Code Observation MPEG Photo Grade


0.00 MH 00:00:00 (Constr) 0Start node type, manhole, reference number : MH.0401.

0.00 WL 00:00:15 (Serv) 0Water level, 5% of the vertical dimension

0.00 S01 FL 00:01:05 1_3A (Struct) 3Fracture, longitudinal, at 12 o'clock, Start

0.00 S02 FL 00:01:05 (Struct) 3Fracture, longitudinal, at 3 o'clock, Start



0.01 S05 SAV 00:01:08 (Struct) 1Surface damage, visible aggregate, from 5 to 7 o'clock,Start

0.01 S06 D 00:01:09 (Struct) 2Deformed sewer/drain, 5%, Start

23.22 GP 00:05:10 (Misc) 0General photograph taken at this point Remarks:GENERAL CONDITION

41.25 F06 D 00:05:64 (Struct) 2Deformed sewer/drain, 5%, End

41.25 S07 D 00:06:55 1_11A (Struct) 4Deformed sewer/drain, 10%, Start

43.49 S08 B 00:07:05 1_12A (Struct) 4Broken pipe, from 3 to 9 o'clock, Start




MH.0401.

Depth: 2.86

Exjet Services



Tel: 01803 557000

Fax: 01803 559556



Weather Vehicle : Camera : Preset : Cleaned : Grade:


no rain or snow WF65XPT camera 2 yes



63.02 F10 B 00:10:14 (Struct) 4Broken pipe, from 4 to 9 o'clock, End









143.03 GP 00:17:30 1_25A (Misc) 0General photograph taken at this point Remarks:GENERAL CONDITION

151.85 FL 00:18:11 (Struct) 3Fracture, longitudinal, at 2 o'clock



189.54 D 00:21:11 1_29A (Struct) 5Deformed sewer/drain, 20%

190.39 B 00:21:21 (Struct) 4Broken pipe, from 3 to 9 o'clock

190.39 D 00:21:21 (Struct) 5Deformed sewer/drain, 25%

190.42 F01 FL 00:21:56 (Struct) 3Fracture, longitudinal, at 12 o'clock, End


Exjet Services



Tel: 01803 557000

Fax: 01803 559556










190.43 F05 SAV 00:21:56 (Struct) 1Surface damage, visible aggregate, from 5 to 7 o'clock,End


190.43 SA 00:21:56 (Misc) 0Survey abandoned Remarks: DEFECT HALTINGSURVEY


18 570 285.99 54460.5 5 0 0 0 0 1

Structural Defects

Service Defects

Constructional Features

Miscellaneous Features

Exjet Services



Tel: 01803 557000

Fax: 01803 559556


Inspection picturesPlace : Road : Date : Section number : PLR Suffix :

BODMIN. BERRYCOOMBE ROAD. 21/10/2016 1 X


Photo: 1_1_3_03112016_093222_A.jpg, Media No:: 1, 00:01:05

0m, Fracture, longitudinal, at 12 o'clock, Start


41.25m, Deformed sewer/drain, 10%, Start

Exjet Services



Tel: 01803 557000

Fax: 01803 559556






43.49m, Broken pipe, from 3 to 9 o'clock, Start



Exjet Services



Tel: 01803 557000

Fax: 01803 559556









Exjet Services



Tel: 01803 557000

Fax: 01803 559556








143.03m, General photograph taken at this point

Exjet Services



Tel: 01803 557000

Fax: 01803 559556








189.54m, Deformed sewer/drain, 20%

Exjet Services


Street : 30 Woodview Road, Paignton

Tel: 01803 557000

Fax: 01803 559556




Place : Location details: U/S MH :

Road : Catchment: U/S Depth :

Location Tape number : D/S MH :

Inspection Pipe Length D/S Depth :

Use: Pipe shape :

Year laid : Pipe size :

Purpose : Pipe material :

Total length : Lining :

Comment :


no rain or snow WF65XPT camera 2 yes SW

BODMIN.

BERRYCOOMBE ROAD.

Fields

MH.4316. (U/S) MH.0401.

1

MH.0401.

2.86

MH.4316.

3.12

Culverted watercourse

Z

Sample survey to determine asset condition

73.07 m

Circular

1200 mm

Concrete



0.00 MH 00:00:00 (Constr) 0Start node type, manhole, reference number : MH.4316.

0.00 WL 00:00:30 (Serv) 0Water level, 5% of the vertical dimension






0.00 S06 ISJ 00:00:39 (Serv) 0Infiltration, seeping at joint, from 3 to 5 o'clock, Start

0.00 S07 ISJ 00:00:39 (Serv) 0Infiltration, seeping at joint, from 7 to 9 o'clock, Start

16.47 IRJ 00:02:14 (Serv) 0Infiltration, running at joint, at 4 o'clock

19.01 FL 00:02:27 2_11A (Struct) 3Fracture, longitudinal, at 1 o'clock

27.48 DEE 00:03:05 (Serv) 3Attached deposits, encrustation, from 5 to 7 o'clock, 10%cross-sectional area loss

35.97 B 00:03:46 2_13A (Struct) 4Broken pipe, from 9 to 3 o'clock

37.69 MH 00:03:54 2_14A (Constr) 0Start node type, manhole, reference number :UNPLOTTED 1 Remarks: LATERAL WITHIN CHAMBER


MH.4316.

Depth: 3.12

Exjet Services



Tel: 01803 557000

Fax: 01803 559556








53.52 MH 00:05:30 (Constr) 0Start node type, manhole, reference number :UNPLOTTED 2 Remarks: LATERAL WITHIN CHAMBER




72.25 B 00:08:38 (Struct) 4Broken pipe, from 3 to 9 o'clock





72.29 F06 ISJ 00:08:38 (Serv) 0Infiltration, seeping at joint, from 3 to 5 o'clock, End

72.30 F07 ISJ 00:08:38 (Serv) 0Infiltration, seeping at joint, from 7 to 9 o'clock, End


72.75 FM 00:08:38 2_28A (Struct) 4Fracture, multiple, from 12 to 12 o'clock

73.07 D 00:08:38 2_29A (Struct) 5Deformed sewer/drain, 25%


73.07 SA 00:10:00 (Misc) 0Survey abandoned Remarks: DEFECT HALTINGSURVEY


12 420 192.92 14097 5 1 2 0.03 2 3

Structural Defects

Service Defects

Constructional Features

Miscellaneous Features

Exjet Services



Tel: 01803 557000

Fax: 01803 559556






0m, Deformed sewer/drain, 5%, Start


19.01m, Fracture, longitudinal, at 1 o'clock

Exjet Services



Tel: 01803 557000

Fax: 01803 559556






35.97m, Broken pipe, from 9 to 3 o'clock


37.69m, Start node type, manhole, reference number : UNPLOTTED 1

Exjet Services



Tel: 01803 557000

Fax: 01803 559556









Exjet Services



Tel: 01803 557000

Fax: 01803 559556








72.75m, Fracture, multiple, from 12 to 12 o'clock

Exjet Services



Tel: 01803 557000

Fax: 01803 559556






73.07m, Deformed sewer/drain, 25%

Appendix B

Recommended Remediation

Works

94 93

79

80

Elm65

60

Grove

Trelane

22

1

WA

TE

RY

LA

NE

79.8m

1

Hill House

Works

1

CA

RD

EL

L

RO

AD

Post

Fla

xmoor

Terr

144

112

El

Sub

Sta

127

142

145

120

94.6m

Hill End

72

66

73

88

Sub Sta

El

87

7

102

106

Arweth

76.1m

Tressa

Ellesmere83.9m

Hillfield

31 30

18

113

CORNER

3

27

23

4

7

ARMCHAIR

1

128

134

135

4

98

101

HIL

LSID

E

PA

RK

72.1m

Cross

Crossways

31a

House

The

Coach

The

Governors

House

Chaplaincy

11

14

8

12

86.4m

4

107

Path

65.2m

150

LB TANWOOD VIEW

27

15

2

11a

97

59

56

119

18

10

20

28

TA

NW

OO

D

VIE

W

18a

141

36

Berrycombe

House

24

2

59.5m

1 to 1

1

30

32

64.1

m

Path (um)

ED Bdy

11

SCARLETTS WELL ROAD

1

SCARLETTS WELL PARK

22

4

Car Park

1

Sub

El

12

14

Sta

46

39

5

CA

MEL

84

45

52

20

16

81

CO

UR

T

10

22

21

1

64.4m

38 to 44

22

35

24

26

DY

MO

ND

CO

UR

T

23

10

16

17

43

Cranborne

NO

RW

AY

RO

AD

51

3

29

Sitka Lodge

1

2

89.1m

57.25

57.25

57.10

57.05

56.99

57.0356.94

57.00

57.05

56.99 56.88

56.83

56.82

56.59

56.8

0

56.6

056.7

6

56.85

56.78

56.7

1

56.83

56.71

56.70

56.73

56.62

56.76

56.57

56.6

5

56.5

1

56.48

56.47

56.37

56.25

56.17

56.18

56.2256.25

56.21

56.31

56.38

56.56

56.53

56.4956.55

56.53

56.41

56.48

56.81

56.91

57.2

6

57.3

6

58.4

0

58.3

559.4

0

59.4

459.7

7

59.6

6

56.89

56.9557.35

58.4

8 57.06

57.35

57.39

59.39

57.41

59.23

59.7557.53

59.90

57.63

57.65

59.83

57.91

58.06

59.3858.15

58.54

58.6

5

58.77

57.51

57.41

56.76

56.3256.37 56.43

56.65

56.76

56.75

56.67

56.54

56.53

56.85

56.78

56.96

57.06

57.25

57.19

57.37

57.45

57.64

57.56

57.72

57.83

57.64

57.59

57.65

57.81

57.97

58.08

58.26

58.18

57.87

57.92

57.91

57.95

57.77

57.73

57.72

57.62

57.59

57.63

57.71

57.47

57.27

57.14

56.98

56.90

56.85

56.85

56.81

56.79

56.80

56.81

56.85

56.81

56.78

56.78

56.65

56.60

56.51

56.57

57.00

56.99

57.06

57.11

57.28

57.32

57.51

57.50

57.69

58.01

56.3556.37

Stn A

206126.327 E

67405.343 N

57.367m

Stn B

206309.203 E

67367.651 N

61.841m

58.91

60.1459.28

60.31

59.71

61.49

59.77

60.16

60.14

61.28

60.92

60.49

61.99

62.45

60.74

60.94

62.75

62.14

61.31

61.43

62.43

61.96

62.27

63.84

62.68

62.75

64.94

63.12

63.35

65.16

63.69

64.08

66.86

64.08

64.25

67.00

66.98

64.28

64.11

61.71

62.29

62.74

63.18

63.3963.53

64.16

64.51

68.49

67.89

63.91

64.43

64.60

67.8467.44

67.58

67.04

64.89

64.66

64.2264.44

64.80

65.03

67.31

66.52

66.96

64.64

64.93

65.02

67.04

67.51

64.62

65.08

65.37

67.42 67.45

65.89

65.47

65.02

65.22

65.60

65.82

67.63

67.97

65.35

65.09

64.71

63.73

66.11

66.37

67.89

68.47

68.16

68.51

68.04

67.11

66.84

66.08

65.34

63.8

4

63.77

64.55

64.6

3

65.7

1

65.88

66.4

5

66.7

1

66.67

66.43

62.22

62.3662.60 62.75 62.99

63.19 63.34

63.66

63.79

63.79

63.63

61.86

57.2557.26

56.62

57.02

57.1157.11

57.45

57.45

57.20

57.48

57.64

57.57

57.88

57.75

57.74

57.85

58.02

58.35

59.07

58.63

58.38

58.53

58.84

59.45

60.04

59.20

58.83

59.23

59.58

60.44

61.60

60.29

59.76

59.48

59.82

60.23

60.83

62.4462.92

61.17

60.44

60.10

60.50

60.84

61.74

62.96

61.18

60.8361.05

61.50

61.99

62.03

61.51

61.11

61.45

61.86

62.40

62.46

61.89

61.58

61.90

62.24

62.72

62.83

62.47

62.11

62.41

62.80

63.19

63.33

62.92

62.86

63.46

65.01

64.51

63.24

57.89

57.42

58.33

59.27

58.25

58.09

59.2

5

58.66

59.75

59.67

60.49

59.60

58.65

58.60

58.07

57.81

57.80

58.02

58.18

58.48

58.43

57.70

57.63

57.52

57.61

57.57

57.56

58.42

58.09

57.98

60.28

59.64

59.52

59.3759.39

59.35

58.90

58.55 59.91

60.31

61.4961.25

61.03

60.8260.6060.46

Stn C

206472.032 E

67377.935 N

64.139m

64.58

64.48

63.84

64.71

64.09

63.88

63.68

63.48

63.21

62.99

62.97

63.15

62.88

62.63

62.41

62.2561.97

61.6661.44

64.10

64.11

64.20

64.35

64.40

64.46

64.58

64.48

64.28

64.38

64.6464.83

64.90

64.93

65.02

64.98

64.86

64.75

64.90

64.78

64.80

64.73

64.73

64.52

64.48

64.57

64.48

64.29

64.55

64.37

64.50

64.28

64.29

64.17

63.94

64.08

64.09

64.05

63.90

63.84

63.7263.65

63.65

63.51

63.35

63.47

63.47

63.97

64.11

64.29

60.28

60.26

60.38

60.41 60.57

60.49

60.62

60.63

60.83

60.85

60.7360.97

61.08

61.18

61.31

61.33

61.32 61.44

61.57

61.5861.89

61.84

61.73

62.14

62.19

62.22

62.34

62.4062.50

62.58

62.56

62.43

62.59

62.72

62.74

62.87

62.98

62.96 63.01

63.06

62.94

63.16

63.28

63.22

60.42

60.36

60.25

60.23

59.93

59.78

58.51

58.54

58.60

58.57

58.58

58.59

58.76

58.3

4

58.60

58.60

58.73

58.74

58.77

58.80

58.55

58.75

59.34

59.98

60.26

60.30

60.32

60.28

60.23

60.24

60.20

60.16

60.12

60.07

60.02

59.98

59.92

59.87

59.82

59.76

59.83

60.16

60.06

59.89

60.21

60.17

60.34

60.50

61.36

61.2

2

60.49

58.38

63.08

63.12

63.16

63.42

63.59

63.8563.90

60.44

60.08

60.12

63.68

60.23

64.30

64.2464.15

64.11

64.05

63.96

63.94

63.81

63.63

63.58

63.2463.12

62.99

62.78

62.51

62.41

62.3161.89

61.6061.2961.1261.0060.7960.55

60.31

60.00

59.73

59.46

59.29

59.03

58.61

58.42

64.21

64.12

64.03

63.98

63.90

63.73

63.57

63.53

63.1963.12

62.92

62.73

62.36

62.1761.83

61.5461.2761.01

60.88

60.6960.5060.25

59.37

59.27

58.97

58.56

64.20

64.16

64.45

64.40

64.07

64.21

63.91

59.05

59.16

59.50

59.72

60.10

60.38

60.6360.78

61.01

61.14

61.28

61.5561.80

62.17

62.52

62.38

62.52

62.68

62.88

62.85

62.80

62.98

63.00

63.15

63.16

63.31

63.24

63.44

63.76

63.48

63.87

63.96

64.44

58.03

58.22

60.22

59.58

59.42

59.97

63.98

64.43

61.25

61.2

6

61.2

4

64.51

60.89

57.96

57.68

60.1059.85

62.98

59.67

59.6459.66

59.77

59.7459.80

63.14

63.07

59.91

59.64

62.93

57.81

62.02

61.14

cover and frame.

Mortar bedding and haunching to

cover and frame.

Mortar bedding and haunching to

230

subsequent movement.

manhole to permit satisfactory joint and

Joint to be as close as possible to face of

Over 750mm diameter = 1.25m length

601-750mm diameter = 1.00m length


Rocker pipe to be :




Rocker pipe to be :

cover slab not required

diameter intermediate reducing

On manholes less than 1.5m

diameter shaft with ladder.

approximately 200mm for 1200mm

over 900mm shaft and offset

Note: Opening to be located centrally

Schedule for requirements.

14396. Refer to the Manhole

Ladder complying with BS EN

the ladder to the edge of the channel.

area to be 500 mm from the edge of

Minimum width of benching for landing

75mm GEN 1 concrete blinding.

using channel pieces.

Inverts to be formed

exceeds 600 mm wide.

provided where channel

Self-cleaning toe holes to be

(minimum thickness 20 mm).

to all branch connections

face, neatly shaped and finished

be brought up to a dense, smooth

High-strength concrete topping to

rings to be pointed.

Lifting eyes in concrete

access behind ladder.

900mm minimum clear

first ladder rung from cover level.

675mm maximum distance to

concrete cover frame seating rings.

engineering bricks or precast

Minimum 2 courses of Class B

requirements.

the Manhole Schedule for

Manhole cover and frame. Refer to

cover and frame.

Clear access to be as Manhole

to BS EN 1917 and BS 5911-3.

or elastomeric seal conforming

bedded with mortar, plastomeric

sections and cover slabs to be

Precast concrete manhole

Shaft diameter 1200mm.

into base concrete minimum 75mm.

The bottom precast section to be built

Benching slope to be 1:10 - 1:30.

Construction joint.

minimum 50mm to maximum 300mm.

underside of precast section to be

Distance between top of pipe and

GEN 3 concrete

225mm to underside of channel,

benching to be 225mm.

Minimum width of

inside face of manhole.

located minimum 100mm

Pipe joint with channel to be

Sewers for Adoption Type 1A

Pre-Cast with Concrete Surround

Manhole Depth 3-6m (Cover to Soffit)

subsequent movement.

manhole to permit satisfactory joint and

Joint to be as close as possible to face of




Rocker pipe to be :




Rocker pipe to be :

cover slab not required

diameter intermediate reducing

On manholes less than 1.5m

diameter shaft with ladder.

approximately 200mm for 1200mm

over 900mm shaft and offset

Note: Opening to be located centrally

Schedule for requirements.

14396. Refer to the Manhole

Ladder complying with BS EN

the ladder to the edge of the channel.

area to be 500 mm from the edge of

Minimum width of benching for landing

75mm GEN 1 concrete blinding.

using channel pieces.

Inverts to be formed

exceeds 600 mm wide.

provided where channel

Self-cleaning toe holes to be

(minimum thickness 20mm).

to all branch connections

face, neatly shaped and finished

be brought up to a dense, smooth

High-strength concrete topping to

rings to be pointed.

Lifting eyes in concrete

first ladder rung from cover level.

675mm maximum distance to

concrete cover frame seating rings.

engineering bricks or precast

Minimum 2 courses of Class B

requirements.

the Manhole Schedule for

Manhole cover and frame. Refer to

cover and frame.

Clear access to be as Manhole

access behind ladder.

900mm minimum clear

to BS EN 1917 and BS 5911-3.

or elastomeric seal conforming

bedded with mortar, plastomeric

sections and cover slab to be

Precast concrete manhole

Benching slope to be 1:10 to 1:30.

into base concrete minimum 75mm.

The bottom precast section to be built

Construction joint.

minimum 50mm to maximum 300mm.

underside of precast section to be

Distance between top of pipe and

GEN 3 concrete

225mm to underside of channel,

benching to be 225mm.

Minimum width of

inside face of manhole.

located minimum 100mm

Pipe joint with channel to be

Sewers for Adoption Type 2

Pre-Cast with Concrete Surround

Manhole Depth 0-3m (Cover to Soffit)

GL

Pipe dia.Aggregate

Graded Single size

Over 400

4/40

2/14, 4/20 or

10/20 or 20/40

4/10, 6/14,

Scale 1:20

3. Any works within 3m of South West Water public sewer subject to agreement with South West Water.

of ground investigation and highway loading requirements.

2. Design is indicative based on preliminary information. Detailed design to be undertaken to take account

1. Pipe bedding material shall comply with the geometrical requirements as identified in SHW Table 5/3

Notes

Coarse Aggregate for pipe bedding

SHW Table 5/3

Bedding Factor 1.9

Class B - 180° Granular Bedding for 1200mmØ Culvert

Pavement construction / soft landscape

Granular backfill to SHW Series 600 Type 2

1200mmØ DN Precast Concrete Culvert

& Table 6/1

Class 8 material to SHW Clause 503.3(iv)

and Table 5/3

Granular material to SHW Clause 503.3(i)

1440300 300

2040

1200

1440

240

300

2700mm

2700mm

N

EXMH2

S1.1

Drainage Legend

Description Proposed Existing To be Abandoned

SX001Public Surface Water Sewer & Manhole

NO REMEDIAL WORKS REQUIREDSEWER IN GOOD CONDITION

REPLACEMENT REQUIRED

SEWER IN POOR CONDITION ALONG WHOLE LENGTH.

SX001

Depth to invert = 2.86m

IL 54.04mAOD

CL 56.9mAOD

C1.9(x)

Depth to Invert = 3.12m

IL ~61.4mAOD

CL ~64.5mAOD


IL 59.88mAOD

CL 63.0mAOD

EXMH2


IL 59.78mAOD

CL 63.0mAOD

C1.1


IL 59.48mAOD

CL 62.9mAOD

C1.2


IL 58.59mAOD

CL 62.5mAOD

C1.3Depth to invert = 3.80m

IL 57.70mAOD

CL 61.5mAOD


IL 56.81mAOD

CL 60.1mAOD


IL 55.92mAOD

CL 59.2mAOD


IL 55.02mAOD

CL 58.0mAOD

C1.7


IL 54.13mAOD

CL 57.0mAOD

C1.8

remedial works identified.

in adequate condition. No

Existing culverted watercourse is

Environmental Information

Safety, Health and

intrusive investigation.

Location to be confirmed through survey and

Voltage power cable from WPD records.

Approximate route of buried 33KV High



Voltage power cable from WPD records.

Approximate route of buried 33KV High



Water water main.

Approximate route of buried South West



Main.

Approximate route of buried W&W MP Gas

2. For further information refer to CDM Risk Register

any works to confirm the location of buried services.

include hand dug trial pits) should be undertaken before undertaking

incomplete or incorrect and thorough buried services survey (to

including HV, MP Gas and MCWS. These records are often

1. Statutory utilities from record drawing have been identified,

work detailed on this drawing, special attention should be given to:

In addition to the hazards/risks normally associated with the types of

and backfilled.

Existing culvert to be broken out

along entire length.

collapsed. Replacement required

in poor condition and partially

Existing culverted watercourse is

13.

12.

11.

10.

09.

08.

07.

06.

05.

04.

03.

02.

01.

General Notes:

periods will apply.

proposed works and the relevant fees and technical approval

Technical approval will be required from South West Water for the

sewer;

the connection of the replacement sewer back into the existing

connection of the existing sewer into the replacement sewer, and for

- A Section 106 connection agreement must be sought for the

adoption of the replacement culvert.

- A Section 104 adoption agreement must be sought for the

planned time of construction the following actions must be taken:

public sewer. Should the culvert still be shown as public sewer at the

The culvert is currently shown on South West Water records as a

approval, assessment, fees and approval periods will apply.

Agency prior to the undertaking of any works, and the relevant

Activity environmental permit will be required from Environment

The culvert is an EA designated Statutory Main River. A Flood Risk

requirements.

advance of works to confirm easement / wayleave and consent

West Water water main. Statutory utility providers to be contacted in

MP Gas Main, Western Power 33kV High Voltage power and South

Statutory utility records show the presence of buried Wales & West

to class 4 (DC4) sulphate resistance.

concrete to BS EN 1916:2002. All precast pipes to be manufactured

Replacement culvert to be 1200mm internal diameter precast

Adoption 7th Edition.

depth) or Type 2 (<3m depth) in accordance with Sewers for

All manholes to be 2700mm diameter precast concrete. Type 1 (>3m

(ii) Solum CCTV Survey, March 2018

(i) Exjet CCTV Survey, October 2016 (Ref 33875/16)

Drawing is based on combined results of:

prior to construction.

Invert levels of existing drainage to be confirmed by investigation

Sewers for Adoption 7th Edition.

All drainage / sewerage to be constructed in accordance with

services.

from Underground Services' when excavating around existing

The Contractor should take note of HS(G)47 'Avoiding Danger

depth of all existing services, mains and cables prior to construction.

It is the Contractors responsibility to determine the location and

of work.

immediately reported to the engineer prior to the commencement

Any discrepancies in the information provided should be

of work.

immediately reported to the Engineer prior to commencement

Any discrepancies in the information provided should be

status.

Drawing Issue Register for full list of drawings and current

Engineers drawings, reports and specifications. Refer to

This drawing is to be read in conjunction with all relevant

Ground).

Digest 1 Concrete in Aggressive

concrete (designed to BRE Special

150mm thick in-situ GEN3 Ground).

Digest 1 Concrete in Aggressive

concrete (designed to BRE Special

150mm thick in-situ GEN3

A0 A B C D E F G H I J K L M N O P Q R S T U

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Do not scale

Arup Job No

Role

Name

Rev

Project Title

Client

© Arup

Rev Date By Chkd Appd

Scale at A0

Suitability

Drawing Title

www.arup.com

Tel +44(0)117 976 5432 Fax +44(0)117 976 5433

Bristol BS1 6JZ

63 St Thomas Street

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Information

Civil Engineering

Mallino Development Ltd


1:500

253391-00

BJH-ARP-XX-XX-DR-CD-1201

01

/ /210318 CB

Information

01

Bodmin Town Leat

Proposed Remediation Works

AR AR

Appendix C

South West Water &

Environment Agency Records

1

Charles Bennett

From: Developer Services Planning <[email protected]>

Sent: 30 September 2016 15:37

To: Salma Hussein

Subject: RE: Bodmin Jail - Culvert WR2753789

Salma the capacity check will only be for the foul – the 10 year greenfield runoff rate suggested by Cornwall Council

for surface water will be acceptable.

Our 1200mm sewer and the Town Leat are in fact one and the same.

Placing actual structures/buildings in relation to a sewer of this size requires a 5m easement either side of it.

Regards

Martyn Dunn

Development Coordinator 01392 443702

South West Water, Peninsula House, Rydon Lane, Exeter, EX2 7HR

From: Salma Hussein [mailto:[email protected]]

Sent: 30 September 2016 10:58 To: Developer Services Planning Cc: Charles Bennett; Dave Hunt; Duncan Laird Subject: RE: Bodmin Jail - Culvert WR2753789

Dear Martyn,

Thanks for your reply. I shall be submitting the capacity enquiry form for further information.

Cornwall Council do state that the maximum allowable discharge rate for the surface water is “the 1 in 10

year greenfield runoff rate or a rate agreed with South West Water Ltd, whichever is the lesser”. Can you

please confirm if this information would be provided as part of the capacity application form? In other

words, would the capacity information for both the surface water and foul be supplied using one application

form?

With regards to the culverts, and from your response below, I understand that there are two culverts running

across the playing fields. One is your 1200mm sewer and the other is Bodmin Town Leat (main river).

As previously mentioned, a car park is proposed by the playing fields and hence near the public sewer. Can

you please confirm SWW’s policy on building near/over sewers in addition to what has been mentioned

below.

Thanks very much for your help.

Kind regards

Ms Salma Hussein

2

Civil Engineer | Infrastructure

MEng (Hons)

Arup

63 St Thomas Street Bristol BS1 6JZ United Kingdom

t +44 117 976 5432 d +44 117 988 6776

f +44 117 976 5433

www.arup.com

Follow @ArupUKMEA @ArupGroup

From: Developer Services Planning [mailto:[email protected]]

Sent: 28 September 2016 12:59

To: Salma Hussein

Subject: RE: Bodmin Jail - Culvert WR2753789

Salma I have no concerns in principle over drainage to two parts of the sewer network as suggested provided foul

and surface water is kept separate and discharge to the respective foul and surface water networks.

You will need to consult Cornwall Council with regard to discharge rates for the surface water before we can fully

comment on whether capacity is available as this may be in a critical drainage area and Council policy may apply.

You will need you to submit a capacity enquiry to assess foul drainage capacity – attached giving details of what is

specifically proposed and how the flows would be split between the east and south.

Regarding the culvert shown on the EA plan this is from what I can tell the 1200mm diameter sewer shown currently

on our records to be a public South West Water surface water sewer running through the playing fields which if to

be used as car parking needs to have existing cover retained as at present over the line of the surface water sewer.

Regards

Martyn Dunn

Development Coordinator 01392 443702

South West Water, Peninsula House, Rydon Lane, Exeter, EX2 7HR

From: Salma Hussein [mailto:[email protected]]

Sent: 26 September 2016 17:35 To: Developer Services Asset Protection

Cc: zz Searches; Developer Services Planning Subject: Bodmin Jail - Culvert

Dear Sir/Madam,

I am working on the redevelopment project of Bodmin Jail (PL31 2NR) to provide a hotel and enhanced

visitor attraction, with a proposal to provide car parking space by the playing fields near Scarlett’s Well

Road in the south. Please refer to site boundary below.

3

Your asset maps below indicate that there separate foul and surface water systems to the east and south of

the site. Presumably, the foul sewer on the east eventually discharges into the combined system in the south,

whilst the surface continues to flow into the 1200 PCO SW sewer.

At this point in time, I would like to understand if there are any constraints or requirements that we need to

be aware of before developing the drainage strategy. For example, if we were to drain half of the site (foul

and surface) towards the east, and half of it towards the south, would the two systems have enough capacity

for the site to discharge into? If not, what limitations should we anticipate and what would you advise?

4

Lastly, the Environment Agency’s (EA) map below shows a culvert (red dashed line) running across the

fields by Scarlett’s Well Road. I understand that this culvert does not belong to the EA nor Cornwall

Council. Can you please clarify if it is the same surface water sewer shown on your maps above (therefore

your asset)?

5

Thanks for your help. Please do not hesitate to contact me if you require further explanation.

Kind regards

Ms Salma Hussein

Civil Engineer | Infrastructure

MEng (Hons)

Arup

63 St Thomas Street Bristol BS1 6JZ United Kingdom

t +44 117 976 5432 d +44 117 988 6776

f +44 117 976 5433

www.arup.com

Follow @ArupUKMEA @ArupGroup

____________________________________________________________

Electronic mail messages entering and leaving Arup business

systems are scanned for acceptability of content and viruses

________________________________________________________

The information and documents sent in this email from South West Water Ltd are sent in confidence and are intended only for the use of the individual or entity named above. Please note that the contents may contain privileged, personal and/or confidential information and are not to be disclosed to any person other than the addressee. If you are not the intended recipient you are notified that any use, dissemination, distribution or copying of the information and documents contained in this email is strictly prohibited. If you have received this email in error, please return it and any copies immediately, without reading any attachments, and confirm that immediately upon returning the email, you will delete all copies on your system and network.

6

South West Water Limited - Registered in England No: 2366665

Registered Office:

Peninsula House

Rydon Lane

Exeter

Devon EX2 7HR

________________________________________________________

Appendix D

Designers Risk Assessment

Hazard Risk Register

Page 1 of 3

\\GLOBAL\EUROPE\BRISTOL\JOBS\253XXX\253391-00\2.21_PQP\AMS\CDM\BODMIN JAIL - CULVERT CDM RISK REGISTER.DOC ©Arup F18.1 Rev 10, 30 June 2005

Register reference 4.50

Project Bodmin Jail Redevelopment Job number 253391

Package/Topic Whole Site Design stage N/A

Remember: Avoid – Reduce – Control and communicate relevant information to others (CDM Regulation 13)

Date Area/Location of Risk

Exposure

Description of Hazard and

Risk Exposure

Mitigation of Risk

(Potential or Achieved) A R C Further Action by

Status

(+ initials) Active/closed

14/03/17

JH/AR

Whole site Uncovering, damaging or

penetrating unknown buried

services

Obtain latest service records

from statutory undertakers.

Scan areas before any

excavation.

Hand dug trial pit or vacuum

excavation to confirm location

of utilities.

x Contractor to prepare

method statement.

Main

Contractor Active

14/03/17

JH/AR

Whole site Site is located next to a public

road, operational attraction and

adjacent to another site – risk of

unauthorised access

Contractor to provide secure

site boundary and liaise with

public and other site as

necessary

x Main

Contractor Active

14/03/17

JH/AR

Whole site Uncovering ground

contamination during

excavation (Japanese knot-weed

and asbestos in particular)

Levels of contamination

should be reviewed before

starting any excavation and

any necessary measures taken

Avoid unnecessary excavation

x x Should material won from

the site be used as fill

onsite – suitable testing

and remediation measures

should be considered.

Main

Contractor Active

22/03/18

CJB

Demolition of

existing culvert

Risk of injury from utility strike

during excavation for

demolition of existing culvert.

GPR and Intrusive survey

prior to construction to confim

location of existing services.

Contractor to follow H&S

guidance document 47 –

Avoiding Danger from

Underground Services

x Contractor to produce

method statement for

installation

Active


Page 2 of 3







Exposure


Risk Exposure

Mitigation of Risk


Status


22/03/18

CJB

Demolition of

existing culvert

Working in confined spaces Work in confined spaces to be

minimised as far as possible.

Culvert is to be replaced

between two existing access

chambers.



installation

Active

22/03/18

CJB

Demolition of

existing culvert

Working in close proximity to

water – culvert is a live

watercourse and can be

expected to be carrying flowing

water.

Works to be undertaken in

period of low flow if possible.

Contractor to identify suitable

method to overpump and

control flowing water if

required.



installation

Active

22/03/18

CJB

Demolition of

existing culvert

Risk of water borne diseases,

such as leptospirosis.

Works to be undertaken in

period of low flow if possible.

Contractor to minimise works

in existing culvert.

x Contractor to identify

appropriate method

statement to control risk.

Appropriate PPE to be

worn. Workers to follow

good hygiene practices

(hand washing).

Active

22/03/18

CJB

Construction of

new culvert

Risk of injury from utility strike

during excavation for

construction of new culvert.

GPR and Intrusive survey

prior to construction to confim

location of existing services.

Contractor to follow H&S

guidance document 47 –

Avoiding Danger from

Underground Services.



installation

Active


Page 3 of 3







Exposure


Risk Exposure

Mitigation of Risk


Status


22/03/18

CJB

Maintenance and

inspection of new

culvert

Hazard from inspections,

clearance of blockage.

Regular access manholes

identified to minimise

requirement for man entry.

Non intrusive methods (eg

CCTV) should be used for

inspection rather than man

entry.

x Active

Further common risks

The following risks are highlighted as risks which a competent contractor should be aware of and are applicable to any site activity. These are not site specific

yet should be considered within the enabling works, construction and demolition.

Falls and trips

Hand Arm Vibration

Working at height (i.e. use of scaffolds)

Use of highly alkaline or acidic materials (appropriate PPE)

Risk of asbestos in existing buildings.

Moving Vehicles within construction sites

Appendix E

Cost Estimate


Cost Estimate - Leat drainage replacement 23rd March 2018

Enabling Works

Strip vegetation (turf) from proposed culvert route; to non-car park

areas only; set aside for re-use

612 m2 £5 £3,060

Strip off remaining topsoil; assume 300mm depth 612 m2 £3 £1,836

Disposal of excavated topsoil to onsite spoil heaps; for future re-use 184 m3 £5 £920

New Culvert / Pipe

Excavation of new drainage culvert trench length; approximately 2.04m

wide and 3m depth to trench bottom from bottom of topsoil strip

1,775 m3 £10 £17,750

Extra excavation to manholes 22 m3 £10 £220

Earthwork support and working space to side of trench 1,914 m3 £25 £47,850

Disposal of excavated material to onsite spoil heaps; for future re-use 1,914 m3 £5 £9,570

Granular material bedding; to SHW Clause 503.3(i) and Table 5/3 368 m3 £60 £22,080

1200mm precast concrete culvert 290 m £350 £101,500

Class 8 material surround 428 m3 £60 £25,680

Granular backfill; type 6F2 or Type 1 ; under car park area only 314 m3 £50 £15,700

Backfill with previously excavated material; to non-car park area; from

onsite spoil heap

337 m3 £10 £3,370

Topsoil; to non-car park area; from spoil heap 92 m3 £10 £920

Re-install turf previously set aside; to non-car park areas 306 m2 £5 £1,530

Manholes; precast concrete; 2700mm diameter; approximately 3.5m

average depth to invert; as Arup drainage details sheet 1 of 6

8 nr £4,750 £38,000

Connections into existing manholes 2 nr £2,500 £5,000

Removal of existing culvert/pipe

Excavation to uncover existing culvert 1,412 m3 £10 £14,120

Disposal of excavated materials to onsite spoil heaps; for future re-use 1,412 m3 £5 £7,060

Allowance for temporary works Item £10,000

Breakout existing concrete culvert/pipe 290 m £60 £17,400

Disposal of broken out concrete culvert offsite; assumed 0.4m3 of

broken out material per m of concrete culvert/pipe

116 m3 £30 £3,480

Infill area under car park with generall fill (class 2 from SHW series

0600)

840 m3 £45 £37,800

Total to be carried forward £384,846


Cost Estimate - Leat drainage replacement 23rd March 2018

Total to be brought forward £384,846

Infill area outside car parking with previously excavated material 900 m3 £10 £9,000

Topsoil; to non-car park area; from spoil heap 92 m3 £10 £920

Re-install turf previously set aside; to non-car park areas 306 m2 £5 £1,530

Other costs

Provisional allowance for dewatering during construction Item £20,000

Additional management and working methodology around potential

crossover with existing WPD electrical supply

2 nr £5,000 £10,000

Allowance to re-use any excess excavated materials onsite Item £5,000

Sub-Total £431,296

Main Contractor preliminaries 10% £43,100

Sub-Total £474,396

Main Contractor's overheads and profit 4.75% £22,500

Sub-Total £496,896

Inflation to 2Q2019 Excluded

Total £496,896

Notes:

Drawing used: Arup BJH-ARP-XX-XX-DR-CD-1201 rev 01

Cost estimate based on a construction works only; excludes VAT, professional fees and land purchase costs

Basis of rates - Recent tender returns and Milton Precast supply quote for concrete pipe

The above exercise excludes surface finishes already included in Berrycombe Vale car park construction works.

Existing culvert/pipe is 1200mm diameter and approximately 3m depth to invert

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