cctv survey report - ribble valley

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Clearwater House, Unit-20A Newby Road Industrial Estate, Hazel Grove, Stockport, SK7 5DA

Telephone: 0845 226 5060 Email: [email protected]

CCTV Survey Report

Client: Chrome Services Limited

Date: 31st, July, 2017

Weather Condition at time of Survey: Dry

Prepared by Andrew Barlow

Site: Chapel Hill, Longridge, Preston, PR3 3JY

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Date: 31/07/2017

Report Summary:

Following our receipt of your order and as requested our engineers attended site to carry out a

CCTV survey of the drainage lines from the manholes of interest (see plan) to check their

condition, location and connectivity.

Once on site our engineers carried out a CCTV survey from Manhole-1(SWMH-1 marked on

plan) downstream to Manhole-2 (SWMH-2 marked on plan). The CCTV survey established a

number of large displaced joints, large cracks, fine roots and encrustation at some of the joints.

We recommend to undertake an excavation over the defective section of pipework and replace

with new pipework, we also recommend High Pressure Water Flailing/ Root Cutting in order to

clear the drainage line of any roots, encrustation and debris. we also recommend to install 5 x

225mm patch liners within the defective section of pipework to ensure the maximum flow of

water can be discharged downstream and also to eliminate any future root growth at certain

joints.

Our engineers then carried out a CCTV survey from Manhole-1Branch Line-1 Upstream to

Head of Line. Unfortunately the survey was abandoned at 4.0 meters due to what we believe to

be a work boot blocking the drainage line which we believe to be leading into a buried manhole.

The CCTV survey also established a number of large displaced joints within the drainage line.

We recommend to undertake an excavation to a maximum depth of 1.5 meters from manhole-1

Branch Line-1 the over the defective section of pipework to the buried manhole and replace

with new 225mm pipework. We also recommend to undertake an excavation over the buried

manhole in order to expose its cover and gain access. Once access has been gained we

recommend to clear the manhole of all debris and provide a manhole condition report, once the

manhole condition has been established a quotation will be provided to raise the frame and cov-

er to ground level.

Our engineers then carried out a CCTV survey From Manhole-1 Branch line-2 Upstream to

Head of Line. Unfortunately this CCTV survey had to be abandoned at 3.2 meters as our

engineers were unable to continue to push the gully camera due to it snagging on something.

We recommend to undertake an excavation from Manhole-1 Branch Line-2 over the defective

section of pipe work and replace with new pipework, whilst the excavation is open a resurvey

will be required in order to establish the drainage lines full condition.

Our engineers then carried out a CCTV survey from Manhole-3 Branch Line-1 upstream to head

of Line. This CCTV survey established a change in pipe diameter at 3.5 meters in which our

Micro Gully camera was unable to pass. Due to the nature of the drain we do not recommend

any further work at this present time.

Our engineers then proceeded with a CCTV survey to Manhole-3 Downstream to Discharge,

This CCTV survey established a number of large displaced joints, fractures at joints,

encrustation at joints and a large amount of silt/debris build up. We recommend High Pressure

Water Flailing in order to clear the drainage line of any encrustation and silt/debris build up, and

to install 3 x 150mm patch liners within the defective section of pipework in order to ensure full

flow as water is being discharged.

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Date: 31/07/2017

Report Summary:

The following report highlights our findings on site, and where necessary we have put forward

recommendations for repairs to be carried out on the drainage system. We have colour coded

the proposed repairs within this report according to the severity of the defect identified/urgency

of the repair. Green=No Defects Yellow = Caution, Red = Urgent.

Please find below our summary of the survey, along with the detailed survey log sheets,

indicative plan of the drains and a manhole condition report.

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Legend of Drawing:

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Manhole Condition Report

Manhole No.

Depth

Cover sizeManhole Status

Duty

Cover Shape

Surface Re-Instatment

Other Info

PIPE DETIALS

BranchCover

Depth from

Ref

Downstream MH

Upstream /

ShapeSize (mm)

Height WiidthPipe Mat

(Y/N)

Drop Shaft

Depth (mm)

Drop ShaftRemark

1

2

3

4

5

6

X

X

X

X

X

X

Incoming Details

Outgoing Pipes

X

Y X

X

Cover Opening at Narrowest

Shaft Size (mm)

mm

mm

Chamber Size (mm) mm

mmShaft Depth (from CL)

Evidence of Surcharge

atmosphere

OX/H2S/METH Toxic

MANHOLE CONSTRUCTION DETIALS

Pre Cast Concrete

Reducing Slab

No. Of Regulation Brick Courses

In Situ Concrete

Segments

Brick PVCu

No. of Landings

Arch Corbel Taper Side Entry

No. of Ladders No. of Step Irons

CONDITION INFOMATION (specific in remarks)

OK

Needs attention

Urgent attention

Cover Shaft Irons/ladder Chamber Benching Channel

Depth of Flow mm Depth of Silt Height of Surcharge from CL mmmm

Remarks

1.17m Circular 225

1.15m Circular 150

Medium

Private

Unmade

SW

500mm

1.19m

SWMH-1

Vitrified Clay

Vitrified Clay 150

225

225 Vitrified Clay 1.19m Circular 225

450

450

600x600

0.16

Cover Duty

Circular

Site Chapel Hill, Longridge, Preston, PR3 3JY

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Manhole No.

Depth


Duty

Cover Shape


Other Info

PIPE DETIALS

BranchCover

Depth from

Ref

Downstream MH

Upstream /

ShapeSize (mm)


(Y/N)

Drop Shaft

Depth (mm)

Drop ShaftRemark

1

2

3

4

5

6

X

X

X

X

X

X

Incoming Details

Outgoing Pipes

X

Y X

X


Shaft Size (mm)

mm

mm




atmosphere

OX/H2S/METH Toxic


Pre Cast Concrete

Reducing Slab


In Situ Concrete

Segments

Brick PVCu

No. of Landings




OK

Needs attention

Urgent attention



Remarks

2.31m Circular 350

Heavy

Public

Tarmac

Foul

600x600mm

2.33m

MHF-1

Concrete 350

350 Concrete 2.33m Circular 350

600

600x600

1400

600

4

Cover Duty

Square


4

7


Manhole No.

Depth


Duty

Cover Shape


Other Info

PIPE DETIALS

BranchCover

Depth from

Ref

Downstream MH

Upstream /

ShapeSize (mm)


(Y/N)

Drop Shaft

Depth (mm)

Drop ShaftRemark

1

2

3

4

5

6

X

X

X

X

X

X

Incoming Details

Outgoing Pipes

X

Y X

X


Shaft Size (mm)

mm

mm




atmosphere

OX/H2S/METH Toxic


Pre Cast Concrete

Reducing Slab


In Situ Concrete

Segments

Brick PVCu

No. of Landings




OK

Needs attention

Urgent attention



Remarks

1.97 Upstream Circular 225

Light

Private

Unmade

SW

500

1.99m

SWMH-3

Vitrified Clay 225

225 Vitrified Clay 1.99 Downstream Circular 225

450

450

870x870

0.12

2

Concrete Biscute Snapped.

Cover Duty

Circular


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The drain surveyed is a circular 225mm diameter vitrified clay pipe transporting surface water.

The below observations have been made:

0.0m - Water level, 0-5%

0.5m - Encrustation, from 9 to 3 o’clock, poor vision to 80.0 meters

1.2m - Encrustation, from 5 to 8 o’clock 5%

2.0m - Longitudinal crack at joint, at 8 o’clock

2.5m - Large displaced joint, encrustation at joint

57.0m - Fine roots at joint

60.4m - Fine roots at joint, fracture at joint

65.0m - Fine roots at joint,

73.5m - Multiple fractures at joint, to 75 meters

80.0m - Large multiple cracks, large open joint.

82.0m The survey finished at Manhole-2.

We recommend the below work:

Undertake an excavation to a maximum depth of 2.0 meters from Manhole-2 over the defective

section of pipework to 3.0 meters and replace with new 225mm pipework (allowing up to

3.0 meters of pipework to be replaced). Whilst the excavation is open High Pressure Water Flailing/

root cutting will be required in order to clear the drainage line of any encrustations, debris or root

growth. Backfill the excavation and reinstate to match the existing surface finish (unmade)

We recommend to install 5 x 225mm Patch Liners within the defective sections of

pipework from Manhole-1at 1.8 to 2.8 meters, 57.0 meters, 60.4 meters, 65.0 meters and 2 at 73.0 to

75.0 meters.

The cost for The excavation is £2480.00 Plus VAT.

The cost for 5 x 225mm x 1.0m Patch Liners is £3200.00 Plus VAT.

The cost for High Pressure Water Flailing/Root cutting is £150.00Plus VAT.

Manhole-1

Manhole-1 Downstream to Manhole-2

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Large crack at joint Large displaced joint with longitudinal crack,

encrustation at joint

Scale build up at joint Encrustations at joint, with fine roots

Fine roots at joint Fine roots at large displaced joint

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Multiple fracturs at joint Large crack with open joint

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0.0m - Water level, 10%

0.2m - Line deviates right 45°

0.5m - Large displaced joint, on deviation

0.9m - Line deviates left 45°

0.9m - Large displaced joint



4.0m - The survey was abandoned, buried manhole with possible collapse, work boot blocking

entrance to it.


Trace and locate the buried manhole (at 4.0 meters fromManhole-1). Undertake an excavation to a

maximum depth of 1.5 meters over the buried manhole in order to expose the cover and gain access.

Once access has been gained we recommend to remove all debris and provide a full report on our

findings (ie contents, condition, usage, connectivity, depth, shaft size and pipework diameter size) ,

once established a quotation will be provided to raise the frame and cover back to ground level.

The cost for the excavation is £920.00 Plus VAT.

We recommend to undertake an excavation to a maximum depth of 1.5 meters over the defective

section of pipework from 0.0 meters at Manhole-1 Branch Line-1 to 4.0 and replace with new

225mm pipework (allowing up to 4.0 meters of pipework to be replaced). Backfill the excavation

and reinstate to match existing surface finish (Unmade).


Manhole-1 Branch-1 Upstream to Head of Line.

Manhole-1 Branch Line-1

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Large displaced joint on deviation Large displaced joint

Large displaced joint on deviation Large displaced joint on deviation

Boot blocking drain line into buried manhole,

possible collapse

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1.0m - Encrustation and scale, from 7 to 1 o’clock

1.1m - Loss of vision, camera under water to 1.6 meters


1.6m - Loss of vision, camera under water to 3.2 meters

3.2m - The survey was abandoned, unable to continue pushing camera.


Undertake an excavation to a maximum depth of 1.5 meters over the defective section of pipework

at 0.0 meters from Manhole-1 Branch line-2 to 3.2 meters an replace with new 150mm pipework

(allowing up to 4.0 meters of pipework to be replaced). Whilst the excavation is open a resurvey

will be required in order to establish the drainage lines full condition. Backfill the excavation and

reinstate to match the existing surface finish (unmade).


The cost for the resurvey is £150.00 Plus VAT.

Manhole-1 Branch-2 Upstream to Head of Line

Manhole-1 Branch Line-2

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Large displaced joint Large displaced joint

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0.2m - Medium displaced joint

0.5m - Debris/silt build up, 10%

1.6m - Line deviates up, slight

2.65m - Line deviates left slight

2.66m - Line deviates down slight


3.5m - Diameter change , 100mm

3.5m - The survey was abandoned, unable to pass diameter change.

We do not recommend any further work at this present time.

Manhole-3 Branch-1 Upstream to Head of Line

Manhole-3

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Medium displaced joint Pipe diameter change, 100mm

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0.5m - Large displaced joint, fracture at joint



4.7m - Debris/silt build up, 25%

5.6m - Large displaced joint, with large fracture


7.3m - Encrustation at joint, from 12 to 12 o’clock, 10%

9.2m - The survey finished at discharge


Undertake High Pressure Water Jetting/Flailing in order to clear the drainage line of any encrusta-

tion and debris/ silt build up. Supply and install 3 x 150mm Patch Liners within the defective sec-

tion of

pipework at 0.5m, 5.6m, and 7.0m.

The cost for 3 x 150mm Patch Liners is £1170.00 Plus VAT.

The Cost for High Pressure Water Jetting/Flailing is £150.00 Plus VAT.

Manhole-3 Downstream to Discharge

Manhole-3

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Large displaced joint, fracture at joint Large displaced joint, encrustation at joint

Large displaced joint, fracture at joint Silt/debris build up, under water line

Large displaced joint, encrustation around joint

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Our engineer has reported the concrete biscuit has

snapped

Our engineer has reported the manhole cover needs replacing with a new manhole cover and frame.

Our engineer has reported the shaft brickwork is deteriorating and crumbling into the drainage line.

Our engineer has reported the step irons are in poor condition and need replacing.

Further work required To Manhole-3

cctv survey report - ribble valley

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