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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
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.
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.
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
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
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
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
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
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
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
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
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
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
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
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 −
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 −
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 −
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 −
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)
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 −
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
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 −
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 −
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
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)