26
Soiltechnics Limited Registered in England 2680759 Registered office: Cedar Barn, NN6 9PY Cedar Barn White Lodge Walgrave Northamptonshire NN6 9PY t: 01604 781877 f: 01604 781007 e: [email protected] w: www.soiltechnics.net For the Attention of Mr Todd Merrell Dear Todd, Re: Land off Kettering Road, Stamford 1 Introduction, brief and proposals 1.1 Further to your instructions, we have now completed investigations at the above site and can offer the following report. Our brief was to undertake infiltration testing to determine the feasibility of using infiltration systems. 2 Site description 2.1 The site is located on the western outskirts of the town of Stamford within a predominantly residential area. At the time of the investigation, the site was a disused football ground and predominately laid to grass. The site was generally level, owing to its previous use. Residential houses bordered the site to the east and an open grassed area lay beyond the footpath to the north. An embankment bordered the site to the north-west with a railway station beyond it. 3 Geology 3.1 We have reviewed geological mapping of the area produced by the British Geological Survey (BGS) at a scale of 1:50,000 scale. A summary of the recorded geological information for the site is presented in Table 1 below: Summary of Geology and likely aquifer containing strata Strata Bedrock or drift Approximate thickness Typical soil type Likely permeability Likely aquifer designation Lower Lincolnshire Limestone Member Bedrock 7.5m Limestone Permeable Principal aquifer Table 1 Morris Homes Limited Morland House 15 Davy Court Castle Mound Way Rugby CV23 0UZ Date: Your Ref: Our Ref: 30 th June 2015 L-STM3201A-002

1 Introduction, brief and proposals

  • Upload
    others

  • View
    1

  • Download
    0

Embed Size (px)

Citation preview

Page 1: 1 Introduction, brief and proposals

Soiltechnics Limited Registered in England 2680759 Registered office: Cedar Barn, NN6 9PY

Cedar Barn White Lodge Walgrave Northamptonshire NN6 9PY

t: 01604 781877 f: 01604 781007 e: [email protected] w: www.soiltechnics.net

For the Attention of Mr Todd Merrell Dear Todd, Re: Land off Kettering Road, Stamford 1 Introduction, brief and proposals 1.1 Further to your instructions, we have now completed investigations at the above site and can

offer the following report. Our brief was to undertake infiltration testing to determine the feasibility of using infiltration systems.

2 Site description 2.1 The site is located on the western outskirts of the town of Stamford within a predominantly

residential area. At the time of the investigation, the site was a disused football ground and predominately laid to grass. The site was generally level, owing to its previous use. Residential houses bordered the site to the east and an open grassed area lay beyond the footpath to the north. An embankment bordered the site to the north-west with a railway station beyond it.

3 Geology 3.1 We have reviewed geological mapping of the area produced by the British Geological Survey (BGS)

at a scale of 1:50,000 scale. A summary of the recorded geological information for the site is presented in Table 1 below:

Summary of Geology and likely aquifer containing strata Strata Bedrock

or drift Approximate thickness

Typical soil type

Likely permeability

Likely aquifer designation

Lower Lincolnshire Limestone Member

Bedrock 7.5m Limestone Permeable Principal aquifer

Table 1

Morris Homes Limited Morland House 15 Davy Court Castle Mound Way Rugby CV23 0UZ

Date: Your Ref:

Our Ref:

30th June 2015

L-STM3201A-002

Page 2: 1 Introduction, brief and proposals

L-STM3201A-002 Page 2 of 4 30th June 2015

4 Fieldwork 4.1 General 4.1.1 Fieldwork was carried out on 24th June 2015 and comprised the formation of seven trial pits to a

maximum depth of 1.66m using a rubber tyred excavator. The extent of fieldwork activities and position of exploratory points were defined by Soiltechnics Limited.

4.1.2 A plan of the site showing site development plans together with locations of exploratory points is

presented on Drawing 02. The position of exploratory points shown on this plan is approximate only and confirmation of these positions is subject to dimensional surveys, which was considered outside our brief.

4.1.3 Exploratory excavations were positioned to avoid known locations of underground services and

located in areas considered likely for possible locations of proposed soakaways. 4.1.4 Prior to commencement of exploratory excavations an electronic cable locating tool was used to

scan the area of the excavation. If we received a response to this equipment then the excavation would be relocated.

4.1.5 All soils exposed in excavations were described in accordance with BS EN ISO 14688 ‘Identification

and Classification of soil’ and BS EN ISO 14689 ‘Identification and classification of rock’. 4.2 Site restrictions 4.2.1 The site was generally accessible for fieldwork activities. 4.3 Exploratory trial pits 4.3.1 Trial pits TP01 to TP07 were excavated to a maximum depth of 1.66 metres. On completion of the

excavations and infiltration testing, the trial pits were backfilled with excavated material compacted using the back of the excavator bucket. Whilst we attempted to reinstate the excavation to its original condition some short-term settlement of the backfilling materials may occur.

4.3.2 Logging was carried out as the trial pit excavation proceeded but the trial pit was not entered at

depths exceeding 1.2 metres, or where sides were deemed unstable. The density of granular soils encountered was gauged by the ease of excavation.

4.3.3 Infiltration testing was carried out in trial pits TP01 to TP05 and TP07 at depths of between

0.412m and 1.66m. The tests were carried out following the procedures described in the Building Research Establishment (BRE) Digest 365 (2007) “Soakaway Design”. Due to the number of locations tested and the rate at which water placed in the trial pits dissipated, only part of a full test cycle could be carried out within some of the trial pits (the BRE Digest recommended three full test cycles) in one day’s fieldwork. The test results have been used to produce an estimate of the soil infiltration rate using the methods described in the BRE Digest.

4.3.4 Trial pit records, together with test results and calculations to determine the soil infiltration rates

are presented in Appendix A.

Page 3: 1 Introduction, brief and proposals

L-STM3201A-002 Page 3 of 4 30th June 2015

5 Ground conditions 5.1 Soils/rocks 5.1.1 Each exploratory excavation encountered a similar profile of soils considered to be Topsoil/Made

Ground overlying Lower Lincolnshire Limestone Member. 5.1.2 Topsoil was encountered in all locations with the exception of TP07 and comprised brown slightly

clayey slightly gravelly sand, with the gravel comprising of limestone. The Topsoil extended to a depth of 0.3m in all locations.

5.1.3 Made Ground was encountered in TP07 and generally consisted of brown slightly clayey slightly

gravelly sand. The gravel comprised limestone, metal, brick and concrete. The Made Ground extended to a depth of 0.8m.

5.1.4 The Lower Lincolnshire Limestone Member generally comprised light brown and orange brown

gravelly sand and orange brown sandy gravel. The Lower Lincolnshire Limestone Member extended beyond the termination depths of the trial pits. The gravel comprised tabulated limestone.

5.1.5 No groundwater was encountered in any of the excavations. 6 Infiltration potential 6.1 The Lower Lincolnshire Limestone Member was encountered as sands and gravels which are

considered to exhibit some permeability. Infiltration testing was carried out in six trial pits (TP01 to TP05 and TP07) following the procedures described in Building Research Establishment (BRE) Digest 365 (2007) ‘Soakaway Design’.

6.2 An infiltration test was attempted in TP06. Following the excavation, approximately 700 litres of

water was pumped into the excavation. Before any measurements could be obtained, a void measuring approximately 20mm wide by 8mm high appeared in the north-west side of the trial pit. The water flowed out through this void in less than 10 seconds and infiltration testing in this location was therefore abandoned.

6.3 Records of the testing and calculations are presented in Appendix A. 7 Conclusion 7.1 Based on the above, infiltration systems can be utilised at the site, located within the Lower

Lincolnshire Limestone Member. However, we recommend a worst case infiltration rate is adopted for the site.

7.2 It is likely the limestone deposits at depth will exhibit some variation in permeability and on this

basis the use of trench type soakaways will increase the likelihood of locating more permeable soils along its length.

Page 4: 1 Introduction, brief and proposals

L-STM3201A-002 Page 4 of 4 30th June 2015

We trust the above and enclosures provides the information you require but should you have any queries please do not hesitate to contact the undersigned. Yours sincerely,

Harry Baxter B.Sc. (Hons) Assistant Geo-environmental Engineer for Soiltechnics Limited

Karen Boothby B.Sc. (Hons) (Open), MIEnvSc. Senior Geo-environmental Engineer for Soiltechnics Limited Enclosed: Drawing 01 – Site location Drawing 02 – Plan showing existing site features and location of exploratory points Appendix A - Infiltration test records

Page 5: 1 Introduction, brief and proposals

Kettering Road, Stamford

Report ref: STM3201A-G01 June 2015 Revision: 0

Title Site location plan

Scale Not to scale

Drawing number 01

Approximate area of investigation

Page 6: 1 Introduction, brief and proposals
Page 7: 1 Introduction, brief and proposals

Key to legends, columns & water observations Trial pit records

Key to legends

Composite materials, soils and lithology

Topsoil Made Ground Boulders

Chalk Clay Coal

Cobbles Cobbles & Boulders Concrete

Gravel Limestone Mudstone

Peat Sand Sand and Gravel

Sandstone Silt Silt / Clay

Note: Composite soil types are signified by combined symbols. Siltstone

Key to ‘test results’ and ’sampling’ columns

Test result Sampling

Depth Records depth that the test was carried out (i.e.: at 2.10m or between 2.10m and 2.55m)

From (m) To (m)

Records depth of sampling

Result

PP – Pocket penetrometer result (kN/m2) HVP – Hand held shear vane result (kN/m2) PP result converted to an equivalent undrained shear strength by applying a factor of 50. Where at least 3 results obtained at same depth then an average value may be reported.

Type

D Disturbed sample

B Bulk disturbed sample

J Disturbed sample placed in sealed jar

ES Environmental sample comprising plastic and glass container

W Water sample

CBR Undisturbed sample in mould (California Bearing Ratio)

Water observations Described at foot of log and shown in the ‘water strike’ column.

= water level observed after specified delay in excavation

= water strike

Page 8: 1 Introduction, brief and proposals

DESCRIPTION

Grass over brown slightly clayey slightly gravelly SAND. Gravel consists of

limestone.

TOPSOIL

Light brown gravelly SAND. Gravel consists of tabular limestone.

LOWER LINCOLNSHIRE LIMESTONE MEMBER

...from 0.9m depth, becoming slightly gravelly and increasingly yellow and orange in colour.

TRIAL PIT TERMINATED AT 1.66m

LEGENDDEPTH

(m)

0.30

1.66

WATER

STRIKE

TEST RESULTS

TYPE/

DEPTH (m)RESULT

SAMPLING

FROM

(m)TO (m) TYPE

Ke�ering Road,

Stamford

Notes: Infiltra(on tes(ng performed. Trial pit sides collapsed by 0.3m during infiltra(on tes(ng.

Ground level (mAOD) Co-ordinates

Groundwater observa�ons

No groundwater encountered.

Dimensions (W x L)

0.60m x 2.20m

Method of excava�on

JCB 3CX

Title

Trial pit record

Date of excava�on (range if applicable)

24/06/2015

Loca�on plan on drawing number

02

Surface breaking

No

Appendix

A

TP01

Report ref: STM3201A-G01 Revision: 0

Page 9: 1 Introduction, brief and proposals

DESCRIPTION

Grass over brown slightly clayey slightly gravelly SAND. Gravel consists of

limestone.

TOPSOIL

Light brown gravelly SAND. Gravel consists of tabular limestone.

LOWER LINCOLNSHIRE LIMESTONE MEMBER

Orange brown sandy GRAVEL. Gravel consists of tabular limestone.

LOWER LINCOLNSHIRE LIMESTONE MEMBER

TRIAL PIT TERMINATED AT 1.50m

LEGENDDEPTH

(m)

0.30

0.70

1.50

WATER

STRIKE

TEST RESULTS

TYPE/

DEPTH (m)RESULT

SAMPLING

FROM

(m)TO (m) TYPE

Ke�ering Road,

Stamford

Notes: Trial pit sides remained upright and stable upon comple-on. Infiltra-on tes-ng performed.

Ground level (mAOD) Co-ordinates

Groundwater observa�ons

No groundwater encountered.

Dimensions (W x L)

0.60m x 2.20m

Method of excava�on

JCB 3CX

Title

Trial pit record

Date of excava�on (range if applicable)

24/06/2015

Loca�on plan on drawing number

02

Surface breaking

No

Appendix

A

TP02

Report ref: STM3201A-G01 Revision: 0

Page 10: 1 Introduction, brief and proposals

DESCRIPTION

Grass over medium dense brown slightly clayey slightly gravelly SAND. Gravel

consists of limestone.

TOPSOIL

Orange brown gravelly SAND. Gravel consists of tabular limestone.

LOWER LINCOLNSHIRE LIMESTONE MEMBER

Orange brown sandy GRAVEL. Gravel consists of tabular limestone.

LOWER LINCOLNSHIRE LIMESTONE MEMBER

TRIAL PIT TERMINATED AT 1.50m

LEGENDDEPTH

(m)

0.30

0.60

1.50

WATER

STRIKE

TEST RESULTS

TYPE/

DEPTH (m)RESULT

SAMPLING

FROM

(m)TO (m) TYPE

Ke�ering Road,

Stamford

Notes: Trial pit sides remained upright and stable upon comple-on. Infiltra-on tes-ng performed.

Ground level (mAOD) Co-ordinates

Groundwater observa�ons

No groundwater encountered.

Dimensions (W x L)

0.60m x 2.40m

Method of excava�on

JCB 3CX

Title

Trial pit record

Date of excava�on (range if applicable)

24/06/2015

Loca�on plan on drawing number

02

Surface breaking

No

Appendix

A

TP03

Report ref: STM3201A-G01 Revision: 0

Page 11: 1 Introduction, brief and proposals

DESCRIPTION

Grass over brown slightly clayey slightly gravelly SAND. Gravel consists of

limestone.

TOPSOIL

Orange brown sandy GRAVEL with cobbles of limestone. Gravel consists of

tabular limestone.

LOWER LINCOLNSHIRE LIMESTONE MEMBER

TRIAL PIT TERMINATED AT 1.45m

LEGENDDEPTH

(m)

0.30

1.45

WATER

STRIKE

TEST RESULTS

TYPE/

DEPTH (m)RESULT

SAMPLING

FROM

(m)TO (m) TYPE

Ke�ering Road,

Stamford

Notes: Trial pit sides remained upright and stable upon comple-on. Terminated due to competency of limestone. Infiltra-on tes-ng performed.

Ground level (mAOD) Co-ordinates

Groundwater observa�ons

No groundwater encountered.

Dimensions (W x L)

0.60m x 2.10m

Method of excava�on

JCB 3CX

Title

Trial pit record

Date of excava�on (range if applicable)

24/06/2015

Loca�on plan on drawing number

02

Surface breaking

No

Appendix

A

TP04

Report ref: STM3201A-G01 Revision: 0

Page 12: 1 Introduction, brief and proposals

DESCRIPTION

Grass over brown slightly clayey slightly gravelly SAND. Gravel consists of

limestone.

TOPSOIL

Orange brown gravelly SAND. Gravel consists of tabular limestone.

LOWER LINCOLNSHIRE LIMESTONE MEMBER

Orange brown sandy GRAVEL. Gravel consists of tabular limestone.

LOWER LINCOLNSHIRE LIMESTONE MEMBER

TRIAL PIT TERMINATED AT 0.82m

LEGENDDEPTH

(m)

0.30

0.60

0.82

WATER

STRIKE

TEST RESULTS

TYPE/

DEPTH (m)RESULT

SAMPLING

FROM

(m)TO (m) TYPE

Ke�ering Road,

Stamford

Notes: Trial pit sides remained upright and stable upon comple-on. Infiltra-on tes-ng performed.

Ground level (mAOD) Co-ordinates

Groundwater observa�ons

No groundwater encountered.

Dimensions (W x L)

0.60m x 2.10m

Method of excava�on

JCB 3CX

Title

Trial pit record

Date of excava�on (range if applicable)

24/06/2015

Loca�on plan on drawing number

02

Surface breaking

No

Appendix

A

TP05

Report ref: STM3201A-G01 Revision: 0

Page 13: 1 Introduction, brief and proposals

DESCRIPTION

Grass over medium dense brown slightly clayey slightly gravelly SAND. Gravel

consists of limestone.

TOPSOIL

Light brown gravelly SAND. Gravel consists of tabular limestone.

LOWER LINCOLNSHIRE LIMESTONE MEMBER

Orange brown sandy GRAVEL. Gravel consists of tabular limestone.

LOWER LINCOLNSHIRE LIMESTONE MEMBERTRIAL PIT TERMINATED AT 1.00m

LEGENDDEPTH

(m)

0.30

0.90

1.00

WATER

STRIKE

TEST RESULTS

TYPE/

DEPTH (m)RESULT

SAMPLING

FROM

(m)TO (m) TYPE

Ke�ering Road,

Stamford

Notes: Trial pit sides remained upright and stable upon comple-on.

Ground level (mAOD) Co-ordinates

Groundwater observa�ons

No groundwater encountered.

Dimensions (W x L)

0.60m x 2.30m

Method of excava�on

JCB 3CX

Title

Trial pit record

Date of excava�on (range if applicable)

24/06/2015

Loca�on plan on drawing number

02

Surface breaking

No

Appendix

A

TP06

Report ref: STM3201A-G01 Revision: 0

Page 14: 1 Introduction, brief and proposals

DESCRIPTION

Grass over brown slightly clayey slightly gravelly SAND. Gravel consists of

limestone, metal, brick and concrete.

MADE GROUND

Orange brown sandy GRAVEL with cobbles of limestone. Gravel consists of

tabular limestone.

LOWER LINCOLNSHIRE LIMESTONE MEMBER

TRIAL PIT TERMINATED AT 1.15m

LEGENDDEPTH

(m)

0.80

1.15

WATER

STRIKE

TEST RESULTS

TYPE/

DEPTH (m)RESULT

SAMPLING

FROM

(m)TO (m) TYPE

Ke�ering Road,

Stamford

Notes: Trial pit sides remained upright and stable upon comple-on. Infiltra-on tes-ng performed.

Ground level (mAOD) Co-ordinates

Groundwater observa�ons

No groundwater encountered.

Dimensions (W x L)

0.60m x 1.80m

Method of excava�on

JCB 3CX

Title

Trial pit record

Date of excava�on (range if applicable)

24/06/2015

Loca�on plan on drawing number

02

Surface breaking

No

Appendix

A

TP07

Report ref: STM3201A-G01 Revision: 0

Page 15: 1 Introduction, brief and proposals

Kettering Road,

Stamford

Plot showing time against depth to water:

Test observations: Calculations:

TIME

(mins)

DEPTH TO

WATER (m)

TIME

(mins)

DEPTH TO

WATER (m)

0 0.98 76 1.235

0.5 0.983 97 1.272 =

1 0.985 132 1.308

1.5 1.002 =

2 1.004

2.5 1.015 =

3.5 1.021

4.5 1.034 =

5.5 1.038

6.5 1.05 =

7.5 1.061

8.5 1.067 =

9.5 1.075 =

10.5 1.078

25 1.148 f =

51 1.176

Groundwater observations Title

Trial pit dimensions (width x length) Ground level Location plan on drawing number

N/A

Depth of trial pit at start of test (m) Co-ordinates Trial pit number Cycle number Date of excavation

- TP01 1 24/06/2015

Report ref: STM3201A-G01 June 2015

Revision: 0

1.66

0.4488m³

the internal surface area of the trial pit up to 50% effective depth

and including the base

3.224m²

the time for the water level to fall from 75% to 25% effective

depth

445 (minutes)

26700 (seconds)

5.21E-06 m/s

No groundwater encountered. Soil infiltration test (following principles of the Building

Research Establishment Digest 365 2007)

0.6m x 2.2m 02

effective storage volume of water in the trial pit between 75%

(d p75 ) and 25% (d p25 ) effective depth

Soil infiltration rate (SIR),

0.980

1.150

1.320

1.490

1.660

0 50 100 150 200 250 300 350 400 450 500

De

pth

to

wa

ter

(m)

Time (minutes)

dp75

dp25

tp25

tp75

257550

2575

×

=

pp

p

ta

Vf

2575 −pV

50pa

2575 pp tt −

DATA EXTRAPOLATED

Page 16: 1 Introduction, brief and proposals

Kettering Road,

Stamford

Plot showing time against depth to water:

Test observations: Calculations:

TIME

(mins)

DEPTH TO

WATER (m)

TIME

(mins)

DEPTH TO

WATER (m)

0 1.06 8 1.27

0.5 1.085 8.5 1.28 =

1 1.095 9 1.293

1.5 1.115 9.5 1.308 =

2 1.13 10 1.314

2.5 1.145 10.5 1.323 =

3 1.16 11 1.334

3.5 1.178 11.5 1.344 =

4 1.183 12 1.35

4.5 1.203 12.5 1.358 =

5 1.215 13 1.364

5.5 1.23 13.5 1.372 =

6 1.237 14 1.386 =

6.5 1.243 15 1.42

7 1.247 17.5 1.5 f =

7.5 1.258

Groundwater observations Title

Trial pit dimensions (width x length) Ground level Location plan on drawing number

N/A

Depth of trial pit at start of test (m) Co-ordinates Trial pit number Cycle number Date of excavation

- TP02 1 24/06/2015

Report ref: STM3201A-G01 June 2015

Revision: 0

1.5

0.2904m³

the internal surface area of the trial pit up to 50% effective depth

and including the base

2.552m²

the time for the water level to fall from 75% to 25% effective

depth

10.9 (minutes)

654 (seconds)

1.74E-04 m/s

No groundwater encountered. Soil infiltration test (following principles of the Building

Research Establishment Digest 365 2007)

0.6m x 2.2m 02

effective storage volume of water in the trial pit between 75%

(d p75 ) and 25% (d p25 ) effective depth

Soil infiltration rate (SIR),

1.060

1.170

1.280

1.390

1.500

0 2 4 6 8 10 12 14 16

De

pth

to

wa

ter

(m)

Time (minutes)

dp75

dp25

tp25

tp75

257550

2575

×

=

pp

p

ta

Vf

2575 −pV

50pa

2575 pp tt −

Page 17: 1 Introduction, brief and proposals

Kettering Road,

Stamford

Plot showing time against depth to water:

Test observations: Calculations:

TIME

(mins)

DEPTH TO

WATER (m)

TIME

(mins)

DEPTH TO

WATER (m)

0 0.926 12 1.231

0.5 1.002 13 1.245 =

1 1.01 14 1.254

1.5 1.034 15 1.27 =

2 1.048 16 1.279

2.5 1.053 17 1.294 =

3 1.061 26 1.395

3.5 1.072 27 1.5 =

4 1.088

5 1.102 =

5.5 1.12

6 1.124 =

7 1.136 =

9 1.173

10 1.196 f =

11 1.206

Groundwater observations Title

Trial pit dimensions (width x length) Ground level Location plan on drawing number

N/A

Depth of trial pit at start of test (m) Co-ordinates Trial pit number Cycle number Date of excavation

- TP02 2 24/06/2015

Report ref: STM3201A-G01 June 2015

Revision: 0

1.5

0.35508m³

the internal surface area of the trial pit up to 50% effective depth

and including the base

2.8264m²

the time for the water level to fall from 75% to 25% effective

depth

19 (minutes)

1140 (seconds)

1.10E-04 m/s

No groundwater encountered. Soil infiltration test (following principles of the Building

Research Establishment Digest 365 2007)

0.6m x 2.2m 02

effective storage volume of water in the trial pit between 75%

(d p75 ) and 25% (d p25 ) effective depth

Soil infiltration rate (SIR),

0.962

1.097

1.231

1.366

1.500

0 5 10 15 20 25

De

pth

to

wa

ter

(m)

Time (minutes)

dp75

dp25

tp25

tp75

257550

2575

×

=

pp

p

ta

Vf

2575 −pV

50pa

2575 pp tt −

Page 18: 1 Introduction, brief and proposals

Kettering Road,

Stamford

Plot showing time against depth to water:

Test observations: Calculations:

TIME

(mins)

DEPTH TO

WATER (m)

TIME

(mins)

DEPTH TO

WATER (m)

0 0.935 18.5 1.312

0.5 0.968 19.5 1.333 =

1 0.991 20.5 1.349

1.5 1.002 21.5 1.363 =

2 1.017 22.5 1.371

3 1.024 30 1.5 =

3.5 1.046

4.5 1.059 =

5.5 1.084

6.5 1.106 =

7.5 1.124

8.5 1.152 =

10.5 1.178 =

11.5 1.273

16.5 1.29 f =

18 1.294

Groundwater observations Title

Trial pit dimensions (width x length) Ground level Location plan on drawing number

N/A

Depth of trial pit at start of test (m) Co-ordinates Trial pit number Cycle number Date of excavation

- TP02 3 24/06/2015

Report ref: STM3201A-G01 June 2015

Revision: 0

1.5

0.37356m³

the internal surface area of the trial pit up to 50% effective depth

and including the base

2.9048m²

the time for the water level to fall from 75% to 25% effective

depth

16 (minutes)

960 (seconds)

1.34E-04 m/s

No groundwater encountered. Soil infiltration test (following principles of the Building

Research Establishment Digest 365 2007)

0.6m x 2.2m 02

effective storage volume of water in the trial pit between 75%

(d p75 ) and 25% (d p25 ) effective depth

Soil infiltration rate (SIR),

0.935

1.076

1.218

1.359

1.500

0 5 10 15 20 25 30

De

pth

to

wa

ter

(m)

Time (minutes)

dp75

dp25

tp25

tp75

257550

2575

×

=

pp

p

ta

Vf

2575 −pV

50pa

2575 pp tt −

Page 19: 1 Introduction, brief and proposals

Kettering Road,

Stamford

Plot showing time against depth to water:

Test observations: Calculations:

TIME

(mins)

DEPTH TO

WATER (m)

TIME

(mins)

DEPTH TO

WATER (m)

0 0.951 205 1.5

0.5 0.956 =

1.5 0.958

2.5 0.966 =

3.5 0.968

4.5 0.976 =

5.5 0.987

6.5 0.993 =

17 1.037

46 1.119 =

77 1.201

97 1.256 =

116 1.277 =

143 1.334

153 1.357 f =

171 1.387

Groundwater observations Title

Trial pit dimensions (width x length) Ground level Location plan on drawing number

N/A

Depth of trial pit at start of test (m) Co-ordinates Trial pit number Cycle number Date of excavation

- TP03 1 24/06/2015

Report ref: STM3201A-G01 June 2015

Revision: 0

1.5

0.396m³

the internal surface area of the trial pit up to 50% effective depth

and including the base

3.09m²

the time for the water level to fall from 75% to 25% effective

depth

119 (minutes)

7140 (seconds)

1.79E-05 m/s

No groundwater encountered. Soil infiltration test (following principles of the Building

Research Establishment Digest 365 2007)

0.6m x 2.4m 02

effective storage volume of water in the trial pit between 75%

(d p75 ) and 25% (d p25 ) effective depth

Soil infiltration rate (SIR),

0.951

1.088

1.226

1.363

1.500

0 50 100 150 200

De

pth

to

wa

ter

(m)

Time (minutes)

dp75

dp25

tp25

tp75

257550

2575

×

=

pp

p

ta

Vf

2575 −pV

50pa

2575 pp tt −

Page 20: 1 Introduction, brief and proposals

Kettering Road,

Stamford

Plot showing time against depth to water:

Test observations: Calculations:

TIME

(mins)

DEPTH TO

WATER (m)

TIME

(mins)

DEPTH TO

WATER (m)

0 0.95

1 0.97

2 1.005

3 1.01

5 1.019

7 1.022

9 1.025

11 1.029

17 1.034

21 1.039

33 1.052

39 1.062

46 1.076

91 1.113

105 1.126

Groundwater observations Title

Trial pit dimensions (width x length) Ground level Location plan on drawing number

N/A

Depth of trial pit at start of test (m) Co-ordinates Trial pit number Cycle number Date of excavation

- TP03 2 24/06/2015

Report ref: STM3201A-G01 June 2015

Revision: 0

1.5

No groundwater encountered. Soil infiltration test (following principles of the Building

Research Establishment Digest 365 2007)

0.6m x 2.4m 02

Insufficient infiltration over 105 minutes of monitoring therefore unable to

calculate soil infiltration rate.

0.950

1.088

1.225

1.363

1.500

0 20 40 60 80 100

De

pth

to

wa

ter

(m)

Time (minutes)

Page 21: 1 Introduction, brief and proposals

Kettering Road,

Stamford

Plot showing time against depth to water:

Test observations: Calculations:

TIME

(mins)

DEPTH TO

WATER (m)

TIME

(mins)

DEPTH TO

WATER (m)

0 1.053

0.5 1.061 =

1 1.067

2 1.069 =

3 1.074

4 1.078 =

37 1.214

84 1.273 =

106 1.289

136 1.316 =

164 1.327

194 1.346 =

210 1.349 =

231 1.36

246 1.376 f =

269 1.378

Groundwater observations Title

Trial pit dimensions (width x length) Ground level Location plan on drawing number

N/A

Depth of trial pit at start of test (m) Co-ordinates Trial pit number Cycle number Date of excavation

- TP04 1 24/06/2015

Report ref: STM3201A-G01 June 2015

Revision: 0

1.45

0.25074m³

the internal surface area of the trial pit up to 50% effective depth

and including the base

2.3346m²

the time for the water level to fall from 75% to 25% effective

depth

200 (minutes)

12000 (seconds)

8.95E-06 m/s

No groundwater encountered. Soil infiltration test (following principles of the Building

Research Establishment Digest 365 2007)

0.6m x 2.1m 02

effective storage volume of water in the trial pit between 75%

(d p75 ) and 25% (d p25 ) effective depth

Soil infiltration rate (SIR),

1.053

1.152

1.252

1.351

1.450

0 50 100 150 200 250

De

pth

to

wa

ter

(m)

Time (minutes)

dp75

dp25

tp25

tp75

257550

2575

×

=

pp

p

ta

Vf

2575 −pV

50pa

2575 pp tt −

Page 22: 1 Introduction, brief and proposals

Kettering Road,

Stamford

Plot showing time against depth to water:

Test observations: Calculations:

TIME

(mins)

DEPTH TO

WATER (m)

TIME

(mins)

DEPTH TO

WATER (m)

0 1.113

1 1.115 =

2 1.116

3 1.118 =

4 1.119

5 1.121 =

18 1.166

31 1.191 =

=

=

=

f =

Groundwater observations Title

Trial pit dimensions (width x length) Ground level Location plan on drawing number

N/A

Depth of trial pit at start of test (m) Co-ordinates Trial pit number Cycle number Date of excavation

- TP04 2 24/06/2015

Report ref: STM3201A-G01 June 2015

Revision: 0

1.45

0.21294m³

the internal surface area of the trial pit up to 50% effective depth

and including the base

2.1726m²

the time for the water level to fall from 75% to 25% effective

depth

345 (minutes)

20700 (seconds)

4.73E-06 m/s

No groundwater encountered. Soil infiltration test (following principles of the Building

Research Establishment Digest 365 2007)

0.6m x 2.1m 02

effective storage volume of water in the trial pit between 75%

(d p75 ) and 25% (d p25 ) effective depth

Soil infiltration rate (SIR),

1.113

1.197

1.282

1.366

1.450

0 50 100 150 200 250 300 350 400

De

pth

to

wa

ter

(m)

Time (minutes)

dp75

dp25

tp25

tp75

257550

2575

×

=

pp

p

ta

Vf

2575 −pV

50pa

2575 pp tt −

DATA EXTRAPOLATED

Page 23: 1 Introduction, brief and proposals

Kettering Road,

Stamford

Plot showing time against depth to water:

Test observations: Calculations:

TIME

(mins)

DEPTH TO

WATER (m)

TIME

(mins)

DEPTH TO

WATER (m)

0 0.448 10 0.613

0.5 0.456 11 0.631 =

1 0.476 12 0.631

1.5 0.485 13 0.637 =

2 0.491 14 0.653

2.5 0.497 15.5 0.669 =

3 0.506 16 0.692

3.5 0.515 17 0.697 =

4 0.53 18 0.705

4.5 0.538 19 0.712 =

5 0.547 20 0.723

5.5 0.554 21 0.727 =

6 0.558 22 0.746 =

7 0.576 23 0.757

8 0.58 42 0.815 f =

9 0.602

Groundwater observations Title

Trial pit dimensions (width x length) Ground level Location plan on drawing number

N/A

Depth of trial pit at start of test (m) Co-ordinates Trial pit number Cycle number Date of excavation

- TP05 1 24/06/2015

Report ref: STM3201A-G01 June 2015

Revision: 0

0.815

0.23058m³

the internal surface area of the trial pit up to 50% effective depth

and including the base

2.2482m²

the time for the water level to fall from 75% to 25% effective

depth

15 (minutes)

900 (seconds)

1.14E-04 m/s

No groundwater encountered. Soil infiltration test (following principles of the Building

Research Establishment Digest 365 2007)

0.6m x 2.1m 02

effective storage volume of water in the trial pit between 75%

(d p75 ) and 25% (d p25 ) effective depth

Soil infiltration rate (SIR),

0.448

0.540

0.632

0.723

0.815

0 5 10 15 20 25 30 35 40

De

pth

to

wa

ter

(m)

Time (minutes)

dp75

dp25

tp25

tp75

257550

2575

×

=

pp

p

ta

Vf

2575 −pV

50pa

2575 pp tt −

Page 24: 1 Introduction, brief and proposals

Kettering Road,

Stamford

Plot showing time against depth to water:

Test observations: Calculations:

TIME

(mins)

DEPTH TO

WATER (m)

TIME

(mins)

DEPTH TO

WATER (m)

0 0.51 37 0.764

1 0.525 44 0.778 =

2 0.528 46 0.794

3 0.533 49 0.815 =

4.5 0.537

6 0.557 =

8 0.567

10 0.59 =

12 0.601

14 0.617 =

18 0.638

20.5 0.653 =

22 0.666 =

26 0.684

32 0.727 f =

34.5 0.75

Groundwater observations Title

Trial pit dimensions (width x length) Ground level Location plan on drawing number

N/A

Depth of trial pit at start of test (m) Co-ordinates Trial pit number Cycle number Date of excavation

- TP05 2 24/06/2015

Report ref: STM3201A-G01 June 2015

Revision: 0

0.815

0.19278m³

the internal surface area of the trial pit up to 50% effective depth

and including the base

2.0862m²

the time for the water level to fall from 75% to 25% effective

depth

23 (minutes)

1380 (seconds)

6.70E-05 m/s

No groundwater encountered. Soil infiltration test (following principles of the Building

Research Establishment Digest 365 2007)

0.6m x 2.1m 02

effective storage volume of water in the trial pit between 75%

(d p75 ) and 25% (d p25 ) effective depth

Soil infiltration rate (SIR),

0.510

0.586

0.663

0.739

0.815

0 5 10 15 20 25 30 35 40 45

De

pth

to

wa

ter

(m)

Time (minutes)

dp75

dp25

tp25

tp75

257550

2575

×

=

pp

p

ta

Vf

2575 −pV

50pa

2575 pp tt −

Page 25: 1 Introduction, brief and proposals

Kettering Road,

Stamford

Plot showing time against depth to water:

Test observations: Calculations:

TIME

(mins)

DEPTH TO

WATER (m)

TIME

(mins)

DEPTH TO

WATER (m)

0 0.412

0.5 0.426 =

1 0.429

1.5 0.433 =

2 0.441

2.5 0.444 =

3 0.46

4 0.464 =

5 0.48

6 0.484 =

7 0.491

8 0.496 =

9 0.502 =

29 0.637

32.5 0.641 f =

41 0.687

Groundwater observations Title

Trial pit dimensions (width x length) Ground level Location plan on drawing number

N/A

Depth of trial pit at start of test (m) Co-ordinates Trial pit number Cycle number Date of excavation

- TP05 3 24/06/2015

Report ref: STM3201A-G01 June 2015

Revision: 0

0.815

0.25326m³

the internal surface area of the trial pit up to 50% effective depth

and including the base

2.3454m²

the time for the water level to fall from 75% to 25% effective

depth

44 (minutes)

2640 (seconds)

4.09E-05 m/s

No groundwater encountered. Soil infiltration test (following principles of the Building

Research Establishment Digest 365 2007)

0.6m x 2.1m 02

effective storage volume of water in the trial pit between 75%

(d p75 ) and 25% (d p25 ) effective depth

Soil infiltration rate (SIR),

0.412

0.513

0.614

0.714

0.815

0 10 20 30 40 50 60

De

pth

to

wa

ter

(m)

Time (minutes)

dp75

dp25

tp25

tp75

257550

2575

×

=

pp

p

ta

Vf

2575 −pV

50pa

2575 pp tt −

DATA EXTRAPOLATED

Page 26: 1 Introduction, brief and proposals

Kettering Road,

Stamford

Plot showing time against depth to water:

Test observations: Calculations:

TIME

(mins)

DEPTH TO

WATER (m)

TIME

(mins)

DEPTH TO

WATER (m)

0 0.66

0.5 0.665

1 0.669

1.5 0.673

2.5 0.678

3.5 0.683

4.5 0.69

36.5 0.744

37.5 0.756

62 0.774

96 0.857

108 0.865

Groundwater observations Title

Trial pit dimensions (width x length) Ground level Location plan on drawing number

N/A

Depth of trial pit at start of test (m) Co-ordinates Trial pit number Cycle number Date of excavation

- TP07 1 24/06/2015

Report ref: STM3201A-G01 June 2015

Revision: 0

1.15

No groundwater encountered. Soil infiltration test (following principles of the Building

Research Establishment Digest 365 2007)

0.6m x 1.8m 02

Insufficient infiltration over 108 minutes of monitoring therefore unable to

calculate soil infiltration rate.

0.660

0.783

0.905

1.028

1.150

0 20 40 60 80 100

De

pth

to

wa

ter

(m)

Time (minutes)