Geotechnical Survey Report

 Geotechnical Survey Report
FGS Ref:
Issue Date:
1234
February 2011
Client Name:
Risk Address:
Ms A another
23 Nowhere Rd
Anywhere
AB10 3AB
Engineer:
###
Company:
Claim Ref:
###
###
Directors:
Trevor Ayres and Vivienne Ayres
Geotechnical Services Manager:
Office Manager:
Geologist:
CAD Technician:
Martin Rush MSc FGS
Louise Hiscock BSc (Hons)
Carina Hicks BSc (Hons)
Perry Martin AMCIHT
Laboratory Manager:
Lara Knight
© FastrackTM 2011 Unit 9 Tyndales Farm
Southend Road
Woodham Mortimer
Maldon
Essex
CM9 6TQ
Tel: 0844 335 8908
Section:
Fax: 0844 335 8907
FGS Ref:
1
####
Email: [email protected]
Web: www.fastrack-geotechnical.co.uk
GEOTECHNICAL SURVEY SUMMARY
Property Address:
Client Claim Ref:
1.1
####
Survey date:
####
####
Operative:
SE1
INTRODUCTION
In accordance with your instructions, we visited the above site on 05th September 2010. The purpose of our visit was
to provide information on the nature of the foundations and the underlying subsoil in order to identify the reason for the
movement exhibited by the property.
The geological survey map of the England and Wales (Sheet No. 295 - Taunton) shows the site to be underlain by the
Mercia Mudstone Groups, noted to comprise of a predominately red, less commonly green-grey, mudstone and silt
stones, with thick halite bearing units; with thin beds of gypsum and sandstones. The site is noted to be close to an
area of unknown age terrace deposits.
The site investigation comprised the excavation of 2No trial pits, one located on either corner of the rear projection.
Through the base of each trial pit a hand auger borehole was drilled to a depth of approximately 1.50m where they
were closed due to impenetrable strata. Details of the drainage survey are discussed within chapter 1.5 and recorded
in full within Appendix 3. (Please refer to appendix 1 for site plan and location details).
1.2
FOUNDATION DETAILS
The foundations of trial pit 1 comprise a CONCRETE footing, seated at a depth of 0.57m, noted to project 220mm from
the face of the brick wall and attain a thickness of 200mm. The foundations of trial pit 1 were noted to be seated into
loose, medium brown, claybound MADE GROUND containing whole bricks.
The foundations of trial pit 2 comprise a CONCRETE footing, seated at a depth of 0.59m, noted to project 100mm from
the face of the brick wall and attain a thickness of 220mm. The foundations of trial pit 2 were noted to be seated onto
loose, red orange / brown, clay with grey mottling, containing black ash (MADE GROUND).
(Please refer to appendix 2 for trial pit drawings and borehole logs).
The control borehole (BH3) was noted to comprise topsoil over red-brown, topsoily, claybound MADE GROUND; the
borehole was aborted at a depth of 0.80m due to an obstruction.
No root activity was encountered within the boreholes.
No water strikes were identified within either the trial pits or the boreholes, which were noted to be dry on completion.
1.3
DRAINAGE SURVEY
A CCTV drainage survey was conducted on the accessible drainage of the property within close proximity to the area
of damage, with 3No. manholes located and 3No. drainage runs surveyed
Hydraulic tests were not possible due to the excessive invert of the manhole and the layout of the runs.
(Please refer to appendix 3 for inspection log).
1.4
LABORATORY ANALYSIS
All samples recovered were tested for their moisture content and atterberg limits.
The comments and opinions expressed within this report are based on the ground conditions revealed
by the site
works, together with an assessment of the site and of the laboratory test results. Whilst opinions may be expressed
relating to the subsoil conditions in parts of the site not investigated, for example between borehole or trial pit positions,
these are for guidance and no liability can be accepted for their accuracy.
For and on behalf of
FASTRACK GEOTECHNICAL SERVICES
© FastrackTM 2011 Unit 9 Tyndales Farm
Southend Road
Woodham Mortimer
Maldon
Essex
CM9 6TQ
Tel: 0844 3358908
Section:
Fax: 0844 3358907
FGS Ref:
2
Email: [email protected]
Web: www.fastrack-geotechnical.co.uk
HEAVE CALCULATION REPORT
Property Address:
Client Claim Ref:
Survey date:
Operative:
Heave Calculation
th
In accordance with your instructions we visited the above site on 15 October 2010 in order to examine the subsoil conditions,
and we have used these findings to provide information on potential heave that might occur following tree removal in a
desiccated soil profile.
The site investigation comprised the drilling of 2No. hand auger boreholes to a maximum depth of 3.56m. Borehole 1 was drilled
through the base of a trial pit excavated on the rear wall of the out building on site, whilst borehole 2, to act as a control, was
drilled 7.50m from the front of the main building to the front of the property area, as far as possible from the effects of
vegetation. Disturbed samples were taken at 0.50m intervals for the purpose of laboratory testing and insitu strength tests in the
form of hand held shear strength / mackintosh probe tests were conducted at each sample level. The position of all boreholes
can be found on the site plan within Appendix I, with full borehole logs within Appendix II.
Selected samples were tested in accordance with BS1377, method of tests for soil for Civil Engineering purposes: 1990. Samples
were tested for their full moisture content profile, with selected samples tested for the Atterberg limits. Selected samples were
also sent to a UKAS accredited laboratory for filter paper method testing for soil suction. All laboratory results can be found
within Appendix 3.
Borehole 1 encountered a very stiff, dark orange/red, sandy, gravelly CLAY beneath the topsoil, at 0.20m depth, and present to
the close of the borehole at 2.57m below ground level.
Borehole 2, the control, encountered MADE GROUND to a depth of 0.70m, onto a grey brown, silty, sandy, gravelly CLAY present
to a depth of 1.50m. A cream/grey, orange brown, silty CLAY with occasional gravel was then encountered, and present to the
close of the borehole at 3.56m below ground level.
Root activity was encountered within borehole 1 and samples of the roots from 0.04m, foundation level, 0.50m, 1.00m and 1.50m
depths were sent to Richardson’s Botanical Identifications for the purpose of identification. The results of this show the roots to
be of Acer spp., of Maples and Sycamores.
Sample suction profiles can be used to estimate the amount of ground heave that may occur following tree removal in a
desiccated soil profile. The heave prediction is normally based on the soil suction profile compared to a control borehole.
However, when soil suctions are not available, a heave calculation can be calculated with the use of moisture contents only
although this is not as accurate as that conducted using soil suction results.
The calculated heave potential for borehole 1 is:
BH
Depth
Heave
potential
BH1
0.50m
77mm
BH1
1.00m
49mm
BH1
1.50m
42mm
BH1
2.00m
27mm
BH1
2.50m
6mm
Section 2 – Heave Calculation – Page 1
Unit 9 Tyndales Farm
Southend Road
Woodham Mortimer
Maldon
Essex
CM9 6TQ
Tel: 0844 3358908
Section:
Fax: 0844 3358907
FGS Ref:
2
Email: [email protected]
Web: www.fastrack-geotechnical.co.uk
HEAVE CALCULATION REPORT
Property Address:
Client Claim Ref:
Survey date:
Operative:
Atterberg limits tests were conducted on three samples of the CLAY subsoil from borehole 1, at 0.04m, 1.50m and 2.50m depths.
This testing found the clay to be of intermediate plasticity (PI=18-20%) which indicates a low susceptibility to movement due to
changes in moisture content.
Full details of laboratory testing are shown within Appendix III.
The comments and opinions expressed within this report are based on the conditions encountered and on the subsequent
laboratory testing. Therefore, it is possible that some special conditions prevailing on site have not been taken into account.
Carina Hicks
For and on behalf of
FASTRACK GEOTECHNICAL SERVICES
Section 2 – Heave Calculation – Page 2
Unit 9 Tyndales Farm
Southend Road
Woodham Mortimer
Maldon
Essex
CM9 6TQ
Tel: 0844 335 8908
Appendix No:
Fax: 0844 335 8907
FGS Ref:
1
####
Email: [email protected]
Web: www.fastrack-geotechnical.co.uk
LOCATION PLAN
Property Address:
Client Claim Ref:
####
Survey date:
####
Operative:
####
SE1
© Crown Copyright. Licence no.
10001998
© NERC. All rights reserved
N
Scale
Drawn by
1:20000@A4
MR
© FastrackTM 2011 Unit 9 Tyndales Farm
Southend Road
Woodham Mortimer
Maldon
Essex
CM9 6TQ
Tel: 0844 335 8908
Appendix No:
Fax: 0844 335 8907
FGS Ref:
1
####
Email: [email protected]
Web: www.fastrack-geotechnical.co.uk
GEOLOGY
Property Address:
Client Claim Ref:
####
Survey date:
####
Operative:
####
N
LC
GD
MG
AL
Scale
Drawn by
1:20000@A4
MR
© FastrackTM 2011 SE1
Unit 9 Tyndales Farm
Southend Road
Woodham Mortimer
Maldon
Essex
CM9 6TQ
Tel: 0844 335 8908
Appendix No:
Fax: 0844 335 8907
FGS Ref:
1
####
Email: [email protected]
Web: www.fastrack-geotechnical.co.uk
GEOLOGY KEY
Property Address:
Client Claim Ref:
####
Survey date:
####
Operative:
####
SE1
Superficial Geology
Map Colour
Map Code
Rock Name
Rock Type
GD
Glaciofluvial Deposits
Sand and Gravel
AL
Alluvium
Clay, Silt, Sand and Gravel
MG
Artificial Ground
-
Bedrock Geology
Map Colour
Map Code
Rock Name
Rock Type
LC
London Clay
Clay, Silt and Sand
Drawn by
MR
© FastrackTM 2011 Unit 9 Tyndales Farm
Southend Road
Woodham Mortimer
Maldon
Essex
CM9 6TQ
Tel: 0844 335 8908
Appendix No:
Fax: 0844 335 8907
FGS Ref:
1
####
Email: [email protected]
Web: www.fastrack-geotechnical.co.uk
SITE PLAN
Property Address:
Client Claim Ref:
####
Survey date:
####
Operative:
####
SE1
N
CBH
MH1
SVP
FG1
TP1/BH1
TP2/BH2
RWP
©Crown Copyright. Licence no.
10001998
Key:
Scale
Drawn by
Gullies and Pipes
Trial Pit
RWP
SWG
SVP
FWG
Shrubs and Trees
Shrub
Deciduous
Manholes
1:200@A4
MR
Borehole
Conifer
Appendix No:
Telephone: 0844 3358908
Fax: 0844 3358907
Tyndales Farm, Southend Road, Woodham Mortimer, Email:[email protected]
Maldon, Essex, CM9 6TQ
Web: www.fastrack-geotechnical.co.uk
FGS Ref:
2
####
TRIAL PIT 1
Property Address: ####
Client Claim Ref: ####
Survey date:####
Operative:
SW1
Bay
0.00m
250
0.15m
Concrete
Claybound MADE GROUND containing brick
70
80
70
80
0.40m
Concrete
Light grey chalky CLAY
400
D1 @ F.L. (0.81m)
V = 86-88kPa
Founding strata:
Light grey chalky CLAY
Drawn by:
Trial Pit Location:
PM
TP1/ BH1
Scale:
1:10
D= small disturbed sample, B= large bulk sample, U= undisturbed sample,
MP= mackintosh proble blow counts, V= shear vane reading (kPa)
© FastrackTM 2011 Tyndales Farm, Southend Road, Woodham Mortimer
Maldon, Essex, CM9 6TQ
Tel: 0844 3358908
Appendix No:
2
Fax: 0844 3358907
FGS Job No:
####
#
Email: [email protected]
Web: www.fastrack-geotechnical.co.uk
Property Address:
Client Claim Ref:
####
####
Survey date:####
Operative:
Borehole ID:
BH1
Hole Type:
Scale:
Samples
Insitu Tests
Water
Strikes Type Depth (m) Type Results
Depth
(m)
1:35
Stratum Description and Observations
Legend
Dark brown, sandy, clayey MADE GROUND containing gravel and brick
0.40
D1
0.50
D2
1.00
D3
1.50
D4
2.00
D5
2.50
D6
3.00
D7
3.50
D8
4.00
D9
4.50
D10
5.00
D11
5.50
D12
6.00
V
112.00
108.00
Stiff, orange brown, silty CLAY containing small brick pieces
1
1.10
Firm / Firm to stiff, orange brown, silty CLAY
V
76.00
72.00
2
V
102.00
98.00
3
V
140.00
4
grey mottling noted at 4.00m depth
water pockets noted at 4.50m depth
V
140.00
V
140.00
5
6.00
6
End of Borehole at 6.00 m
Key:
Water Strike
D
Disturbed Sample
V
Insitu vane test
MP
Mackintosh Probe Test
Remarks: Borehole closed at 6.00m depth
Noted to contain 0.25m of standing water in base of borehole on completion
N.b. Unless otherwise stated small vane paddle used
© FastrackTM 2011 Appendix No:
Telephone: 0844 3358908
Fax: 0844 3358907
Tyndales Farm, Southend Road, Woodham Mortimer, Email:[email protected]
Maldon, Essex, CM9 6TQ
Web: www.fastrack-geotechnical.co.uk
FGS Ref:
2
####
TRIAL PIT 2
Property Address: ####
Client Claim Ref: ####
Survey date:####
Operative:
SW1
Conservatory
0.00m
Concrete
0.10m
Claybound MADE GROUND containing brick
330
150
0.40m
Light grey chalky CLAY
Concrete
350
0.68m
Very dense orange gravelly SAND
D1 @ F.L. (0.68m)
MP = 4-5-100/ 45mm Travel
Founding strata:
Very dense orange gravelly SAND
Drawn by:
Trial Pit Location:
PM
Scale:
1:10
D= small disturbed sample, B= large bulk sample, U= undisturbed sample,
MP= mackintosh proble blow counts, V= shear vane reading (kPa)
TP2/ BH2
© FastrackTM 2011 Tyndales Farm, Southend Road, Woodham Mortimer
Maldon, Essex, CM9 6TQ
Tel: 0844 3358908
Appendix No:
2
Fax: 0844 3358907
FGS Job No:
####
Email: [email protected]
Web: www.fastrack-geotechnical.co.uk
Property Address:
Client Claim Ref:
####
####
Survey date:####
Operative:
Borehole ID:
BH2
Hole Type:
Scale:
Samples
Insitu Tests
Water
Strikes Type Depth (m) Type Results
Depth
(m)
Stratum Description and Observations
Legend
Block paving
0.08
0.10
0.20
0.25
D1
1:35
Sand
Lean mix concrete
0.50
Hardcore sub base
Firm, grey brown, mottled orange, silty CLAY
D2
1.00
D3
1.50
D4
2.00
D5
2.50
D6
3.00
D7
3.50
D8
4.00
D9
4.50
D10
5.00
D11
5.50
D12
6.00
V
64.00
68.00
1
V
140.00
2
V
140.00
3
V
140.00
4
V
140.00
5
V
140.00
6.00
6
End of Borehole at 6.00 m
Key:
Water Strike
D
Disturbed Sample
V
Insitu vane test
MP
Mackintosh Probe Test
Remarks: Borehole closed at 6.00m depth
Noted to be dry on completion
N.b. Unless otherwise stated small vane paddle used
© FastrackTM 2011 Tel: 0844 3358908
Appendix No:
Fax: 0844 3358907
FGS Ref:
3
###
Email: [email protected]
Tyndales Farm, Southend Road, Woodham Mortimer,
Maldon, Essex, CM9 6TQ
Web: www.fastrack-geotechnical.co.uk
LABORATORY RESULTS
Property Address:
###
Client Claim Ref:
###
Client:
SAMPLE DETAILS
###
ANALYSIS REQUESTED
Investigation date:
23rd November 2010
Moisture Content
PSD
Sample details:
Bags as received
Liquid Limit
Soil Suction
Samples received:
26th November 2010
Plastic Limit
Shear Strength
Schedule recieved:
26th November 2010
Plasticity Index
Contamination
Samples tested:
26th Nov - 8th Dec 2010
Root ID
Root/Tree DNA
Results reported:
8th December 2010
Other (please state)
TEST DETAILS
General
Sample descriptions were written in accordance with BS 5930:1999.
Samples were prepared in accordance with BS 1377: Part 1: 1990, section 7
Samples from this contract will be retained for 1 calender month following the issue of this report unless otherwise notified
Written approval is required from Fastrack Geoetchnical Services Limited to reproduce report in full. The results shown within this report only
relate to the samples tested
Moisture Content
Samples were tested in accordance with BS 1377: Part 2: 1990, section 3.2 (Oven drying method)
In accordance with Note 1 to paragraph 3.2.4 of BS 1377 Part 2 1990; these moisture contents have been corrected to give the equivalent
moisture content of the fraction passing the 425µm sieve, to enable comparison with the liquid & plastic limits. (If condition of test is 'natural'
the retained percentage is an estimated value, if condition is 'washed' the percentage is a measured value).
o
Samples are dried at 105-110 C unless otherwise stated.
Atterberg Limits
Samples were tested in accordance with BS 1377: Part 2: 1990, section 4.3 (4 drop LL), 4.4 (1 drop LL), 5.3 (PL) and 5.4 (PI)
Test results on samples with a sand content, may show less accurate results. If condition of test is 'washed' results relate to the fraction
passing the 425µm sieve only.
*
Driscoll's rules deem the soil to be desicated where the moisture content is less than the value calculated using driscoll's rule 1 and/or 2
Particle Size Distribution
Samples were tested in accordance with BS 1377: Part 2: 1990 section 9.2 (Wet sieving method)
Undrained Shear Stength
Samples were prepared in accordance with BS 1377: Part 7: 1990 section 8.3 and testing in accordance with BS 1377: Part 7: 1990: section
8.4 (undrained shear strength in triaxial compression without measurement of pore pressure (UU))
Soil Suction
Samples were prepared and tested based on the BRE digest No:IP4/93 (Corrected).
(Corrected) 'A method of determining the state of desiccation in clay
soils.' (Filter paper method).
Test results on samples with a sand or silt content, may show less accurate results. Deviation to standard procedure - Polythene bags are
not used from weighing filter papers.
Page 1 of 3
© FastrackTM 2011 Tel: 0844 3358908
Appendix No:
Fax: 0844 3358907
FGS Ref:
3
###
Email: [email protected]
Tyndales Farm, Southend Road, Woodham Mortimer,
Web: www.fastrack-geotechnical.co.uk
Maldon, Essex, CM9 6TQ
LABORATORY RESULTS
Property Address:
###
Client Claim Ref:
###
Depth
MC
LL
PL
PI
Class
% Retained
(425µm)
BOREHOLE 1
Corr.
MC
Soil
Suction
Condition
of test
Soil Description
(m)
(%)
(%)
(%)
(%)
(%)
0.81
24.5
24.75
35
40
42
CL
1
(kPa)
130
Natural
1.00
22
23.16
32
41
45
CL
5
122
Natural
Grey / brown silty CLAY containing claystone and chalk fragments
Grey silty clayey MADEGROUND containing brick, claystone and chalk fragments
1 50
1.50
24
25.26
25 26
33
42
43
CL
5
132
Natural
Grey / brown silty CLAY containing claystone and chalk fragments
2.00
25.5
26.84
34
43
41
CL
5
140
Natural
Brown silty CLAY containing claystone and chalk fragments
GRAPH
Corrected Moisture Content (%)
Liquid Limit (%)
Plastic Limit (%)
LL x 0.4 (Driscoll's Rule 1)
A-Line
0.81m
PL + 2% (Driscoll's Rule 2)
Soil Suction (kPa)
1.50m
2.00m
10
Moisture Content (%)
20
30
40
50
80
0.00
0
1.00m
Upper Plasticity Range
Int.med
High
V. High
CI
CH
CV
CE
MI
MH
MV
ME
Extr. High
70
Low Plasticity
60
0.50
CL
y Index (%)
Plasticity
40
50
130
Depth
h (m)
1.00
122
20
30
1.50
132
10
2.00
140
0
2.50
ML
120
125
130
135
Soil Suction (kPa)
140
145
0
20
40
60
Liquid Limit (%)
80
100
Comments:
Issued by:
Lara Knight (Laboratory Manager)
Other Signed:
Page 2 of 3
© FastrackTM 2011 120
Tel: 0844 3358908
Appendix No:
Fax: 0844 3358907
FGS Ref:
3
###
Email: [email protected]
Tyndales Farm, Southend Road, Woodham Mortimer,
Web: www.fastrack-geotechnical.co.uk
Maldon, Essex, CM9 6TQ
LABORATORY RESULTS
Property Address:
###
Client Claim Ref:
###
Depth
MC
LL
PL
PI
Class
% Retained
(425µm)
BOREHOLE 2
Corr.
MC
Soil
Suction
Condition
of test
Soil Description
(m)
(%)
(%)
(%)
(%)
(%)
0.68
15.6
15.76
25
32
40
CL
1
(kPa)
125
Natural
Brown clayey SAND containing gravel
1.00
16.2
16.7
23
35
41
CL
3
126
Natural
Brown clayey SAND containing gravel
1 50
1.50
17.5
17 5
18.42
18 42
28
37
42
CL
5
140
Natural
Brown clayey SAND containing gravel
GRAPH
Corrected Moisture Content (%)
Liquid Limit (%)
Plastic Limit (%)
LL x 0.4 (Driscoll's Rule 1)
PL + 2% (Driscoll's Rule 2)
Soil Suction (kPa)
10
Moisture Content (%)
20
30
0.68m
1.00m
1.50m
40
80
0.00
0
A-Line
Upper Plasticity Range
Int.med
High
V. High
CI
CH
CV
CE
MI
MH
MV
ME
Extr. High
70
0.20
Low Plasticity
y Index (%)
Plasticity
40
50
Depth
h (m)
0.80
0.60
60
0.40
CL
125
10
1.40
20
1.20
30
1.00
126
140
0
1.60
ML
120
125
130
135
Soil Suction (kPa)
140
145
0
20
40
60
Liquid Limit (%)
80
100
Comments:
Issued by:
Lara Knight (Laboratory Manager)
Other Signed:
Page 3 of 3
© FastrackTM 2011 120
Richardson's Botanical Identifications
49-51 Whiteknights Road, Reading, RG6 7BB | [email protected] | 0118 986 9552
.
Fastrack Geotechnical Services Ltd.
Tyndales Farm
Southend Road
Woodham Mortimer
MALDON, Essex CM9 6TQ
Order No
Date
Job Ref
Dear Sirs
Risk Address
The samples you sent in relation to the above on Date (received by us on
Date) have been examined. The structure was referable as follows:
BH1, 1.50m
1 root: microscopic examination showed insufficient cells for recognition.
BH1, 3.00m
1 root: most like QUERCUS (Oak) or the related CASTANEA (Sweet Chestnut).
This was a very THIN and decayed sample. A further root, not examined in detail
appeared similar under low magnification.
17 pieces of TWIGS, not roots. Not identified.
21 roots: unfortunately insufficient cells for identification.
BH2, 2.50m
1 root: QUERCUS (Oak). 2 further roots, not examined in detail appeared similar
under low magnification.
5 pieces of TWIGS, not roots. Not identified.
3 roots: unfortunately insufficient cells for identification.
BH2, 3.00m
1 root: QUERCUS (Oak). 8 further roots, not examined in detail appeared similar
under low magnification.
11 roots: unfortunately insufficient cells for identification.
I trust this is of help; please call us if you have any queries.
Yours faithfully
Dr Ian B K Richardson
* * Try out our web site on www.botanical.net * *
____________________________
Identified with no information on vegetation, on or off site.
© FastrackTM 2011 Tel: 0844 3358908
Appendix No:
Fax: 0844 3358907
FGS Ref:
4
####
Email: [email protected]
Tyndales Farm, Southend Road, Woodham Mortimer,
Maldon, Essex, CM9 6TQ
Web: www.fastrack-geotechnical.co.uk
DRAINAGE SURVEY
Property Address:
####
Client Claim Ref:
####
Survey date: ####
Operative:
SW1
Following your recent instruction we attended the above property and carried out a cctv camera survey and
hydraulic testing of the drainage, in accordance with procedures detailed in the WRc Drain Repair Book.
Manhole / Inspection chamber Summary:
Node
Invert Level (m)
Manhole
Construction
Pipe Size
Pipe
Material
Manhole
Condition
MH1
0.90m
Brick & Render
100mm
Salt Glaze
GOOD
Type of Cover Size of Cover
Cast Iron
660x510mm
Hydraulic Testing Summary:
Run
From
To
1
MH1
2
MH1
Result
Remarks
Upstream
PASS
No loss
Downstream
FAIL
2cm drop over 5 minutes
3
4
5
6
Serviceability:
1
Is the system failing to discharge normal household flows to the sewer system? (i.e. recurrance of
blockage)
No
2
Is there evidence of leakage occuring (infiltration or exfiltration)?
No
3
Is there intermittent storm-water flooding?
No
4
Has a hydraulic leakage test failed?
N/A
5
Do observed defects make the drain unservicable?
No
Comments:
Recommendations for Repair:
Run
Grade
Recommended action
1
A
None required
2
B
Install structural liner
3
C
Replace with new uPVC
4
5
6
© FastrackTM 2011 Tel: 0844 3358908
Tyndales Farm, Southend Road, Woodham Mortimer,
Maldon, Essex, CM9 6TQ
4
Appendix No:
Fax: 0844 3358907
####
FGS Ref:
Email: [email protected]
Web: www.fastrack-geotechnical.co.uk
DRAINAGE SURVEY
Property Address:
####
Client Claim Ref:
####
Run Details: (Please refer to appendix 1 for site plan and run layout)
Ownership
Run
From
To
Pipe Diameter
Pipe Materials
Duty
Direction
1
MH1
Upstream
100mm
Salt Glaze
Foul
Upstream
Private
2
MH2
Downstream
100mm
Salt Glaze
Foul
Downstream
Private
3
4
5
6
Grade Guidelines:
Grade A
Grade B
Grade C
Condition grade A: Structurally sound with no leakage evident. Slight crack/defects permitted.
Condition grade B: Cracks and/or fractures observed but pipe provides sufficient arching support.
Some leakage may be evident.
Condition grade C:Structurally unsound with insufficient arching support. Total collapse/blockage likely
in the future.
Inspection Report:
Observations
Remarks
m
1
0.00
SS
Start Survey
0.50
WL
Water level
1.00
CN
Connection
1.00
WL
Water level
0
5.50
CN
Connection
0
Lateral enters from above (FG2)
10.00
SF
0.00
SS
8.00
CC
B
Crack, circumferential
5
Standing water
8.50
JD(M)
B
Joint displaced medium
50
Standing water
9.00
WL
Water level
0
Standing water
10.00
SF
0.00
SS
1.50
CL
B
Crack, longitudinal
3.20
OJ(L)
C
Open joint large
SF
C
Finish Survey
2
3
Code Grade
Water (%) Clock
Run
A
5
Standing water
Lateral enters from above (FG1/SVP)
Finish Survey
Start Survey
B
Finish Survey
Start Survey
© FastrackTM 2011 Tyndales Farm
Southend Road
Woodham Mortimer
Maldon
Essex CM9 6TQ
Tel: 08443358908
Fax: 08443358907
Email: [email protected]
Web: www.fastrack-geotechnical.co.uk
DRAINAGE REPAIR ESTIMATE
Property Address:
Client Claim Ref:
####
Survey date:
####
Operative:
####
Date
Our Ref:
Your Ref:
Re:
####
########
Estimate for drainage repairs
Works:
1.
RWG and KWG
Excavate and replace Gully and 1m pipework with new uPVC, jet runs and
CCTV survey
TOTAL
£##.## exc vat
This estimate is exclusive of vat, is based on our interpretation of the required repairs and limited to the
items listed above; should any further works be deemed necessary they will be charged in accordance
with the schedule of rates. Should you require alternative repairs to be carried out, please provide details
and we will issue a revised quotation as soon as possible. An assumption has been made that a building
notice is not required for the completion of these works; in the event that a building notice is required, we
can obtain it on your behalf; this will be charged at cost plus 10%. This estimate should be read in
conjunction with our standard schedule of assumptions and conditions of contract; a copy of which can be
obtained from the office.
This estimate is valid for 2 calendar months from the date of issue.
Should you have any queries please do not hesitate to contact the office on 08443358908.
Yours sincerely
Fastrack™ Geotechnical Services Ltd
© FastrackTM 2011 SE2