CONTAMINATION REPORT DESK STUDY - Broadland · 2014. 9. 26. · 19158/EP 2 July 2014 The Oaks,...
Transcript of CONTAMINATION REPORT DESK STUDY - Broadland · 2014. 9. 26. · 19158/EP 2 July 2014 The Oaks,...
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CONTAMINATION REPORT
DESK STUDY
Job No. 19158
Proposed Development
The Oaks
Harvey Lane
Thorpe
Norwich
NR7 0BN
Client: NPS
July 2014
exyar1553
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19158/EP 1 July 2014
The Oaks, Harvey Lane
CONTENTS
1.0 INTRODUCTION………………………………………………………………………............... 2
2.0 OBJECTIVE……………………………………………………………..................................... 2
3.0 SITE PROPOSAL…..……..………………...………………………………………………..….... 2
4.0 HISTORICAL SETTING.………………..……………………………………..………....……… 2-3
5.0 CURRENT ENVIRONMENTAL SETTING………………………………………………….. 3-5
5.1 Environmental Permits, Incidents & Registers....................................................... 3
5.2 Landfills and Other Wastes...................................................................................... 3
5.3 Current Industrial Data............................................................................................ 3-4
5.4 Geology....................................................................................................................... 4
5.5 Hydrogeology and Hydrology.................................................................................. 4
5.6 Flooding...................................................................................................................... 4
5.7 Designated Environmentally Sensitive Areas......................................................... 4
5.8 Natural Hazards and Mining……………………………………………………..…………. 4-5
6.0 EXISTING SITE & WALKOVER.…………..………………………………..……………........ 5
7.0 PRELIMINARY CONCEPTUAL SITE MODEL…………………..………..……………....... 5-7
8.0 SUMMARY……………………………..………………………………………………................ 8
CONDITIONS OF INVESTIGATION AND REPORTING.....……………………………. 8
DRAWINGS
Drawing No. 19158/701 - Site Location Plan
Drawing No. 19158/702 - Existing Site Layout & Photograph Locations
Drawing No. 19158/711 - British Geological Survey Map Extract - Superficial
Drawing No. 19158/712 - British Geological Survey Map Extract - Bedrock
Drawing No. 19158/713 - Hydrogeological Map of Northern East Anglia
Extract
Drawing No. 19158/714 - Environment Agency Landfill Map Extract
TABLES
Table 1 - Historic Land Use (in report)
Table 2 - 2A, 2B, 2C & 2D Preliminary Coceptual Site Model
(in report)
PHOTOGRAPHS - Site Photographs
APPENDIX A - Groundsure EnviroInsight Report
APPENDIX B - Historical Maps & Aerial Photographs
APPENDIX C - Risk Matrix
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19158/EP 2 July 2014
The Oaks, Harvey Lane
1.0 INTRODUCTION
This report details a Phase 1 Desk Study Contamination Report for land at The Oaks,
Harvey Lane as indicated in Drawings No’s 19158/701 & 702. The report was
commissioned in June 2014 by Mr J Green of NPS.
This report has been produced to cover the entire site area displayed in Drawing
No’s.19158/701 & 702. However, any forthcoming application(s) for the redevelopment
of the site may come forward as either one single application or individual applications.
2.0 OBJECTIVE
To undertake a Phase I Desk Study report to assess the likelihood of contamination existing
on-site and the potential for it to cause harm to site receptors.
3.0 SITE PROPOSAL
The site is proposed for residential development, the layout of which is currently unknown.
4.0 HISTORICAL SETTING
Maps and Aerial photographs indicate the following;
Year
On-site Off-site
1883 The Oaks (Residential House) &
Associated buildings
Sunny Hill (0m E)
Holmwood (45m E)
Harvey Lane (0m W)
Thorpe Lodge (120m SW)
Map describes Roman Artefacts
found in field (1863) (0m NE)
Well (95m N)
Pinebanks (125m E)
Bellevue (200m E)
Holly Lodge (25m E)
Embankment (40m NW)
1886
Well immediately to the north of the
main building
Various pathways indicated through
the garden and forest areas
Tank (80m N)
1905-1912
Fewer pathways are now indicated
through the garden and forest area
of the site
Tank (20m W)
Bellevue (200m E) now named ‘Beech
Hill’
Sunny Hill (0m E) now named
‘Sunninghill’
Holly Lodge (25m E) no longer
named on the map
1914-1926 "
Tank (145m SE)
Tank (155m SE)
Well (95m N) no longer shown
1928 Well no longer shown Pit (35m S)
1938 Bungalow shown on the north of the
site Sunninghill (0m E) named ‘Sunny Hill’
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19158/EP 3 July 2014
The Oaks, Harvey Lane
1958 Alterations to The Oaks and
associated buildings
Sunny Hill now named ‘Thorpe House
School’
Resthaven Nursing Home (0m W)
Playing Field (0m E)
1975
The Oaks shown as ‘home for the
aged’
Additional bungalow immediately to
the east of the existing bungalow
"
1993
The Oaks is shown reduced in size
where the eastern part of ‘The Oaks’
is no longer shown.
"
1999 Aerial
Photograph "
Area of pit (35m S) shown covered
with woodland
2002 " "
2003 Aerial
Photograph
Building in north eastern area of the
site "
2006 Aerial
Photograph " "
2012 " "
2013 Aerial
Photograph The Oaks "
Table 1. – Historic Land Use
From the historical maps, ‘The Oaks’ appears to have been a residential dwelling for the
majority of the twentieth century. Until 1975, there was no indication from the maps that
the building served any purpose other than residential. On the 1975 historic map, the
main building is shown as a ‘home for the aged’. It is presumed that the building up until
this point, served as a private residence.
The identified pit (30m S) was found to have been used as a historic landfill site, based
upon information provided in Groundsure EnviroInsight Report (Appendix A). This site is
listed in the Groundsure Report as containing only inert liquid (Appendix A). However,
publically available information from the Environment Agency (EA) website states that the
landfill was filled with industrial wastewater, sewage sludge and chemical wastes mixed
with municipal solid waste. The extent of the landfill and its distance from the site can be
seen in Drawing 19158/714
5.0 CURRENT ENVIRONMENTAL SETTING
The Groundsure EnviroInsight Report (Appendix A), Historical Maps (Appendix B) and all
other available information indicate the environmental setting and potential sources of
contamination within 250m of the site;
5.1 Environmental Permits, Incidents and Registers
Onsite:
None recorded.
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The Oaks, Harvey Lane
Offsite:
Licensed Discharge Consents
- Sewage Discharge to River Yare – Pumping Station (67m SW) - Sewage Discharge to River Yare Tributary – Pumping Station (101m S)
5.2 Landfills and Other Waste Sites
The Groundsure EnviroInsight Report indicates a historic landfill between the Yarmouth
road and the River Yare (89m S). The landfill waste type is listed as: Inert Liquid Sludge.
See Drawing 19158/714 for the exact location of the landfill.
5.3 Current Industrial Data
On-site:
- None
Off-site:
- Electricity Substation (117m E) - Electricity Substation (145m S) - Pumping Station (162m SW) - Pumping Station (174m S) - Electricity Substation (184m N) - Electricity Substation (248m SW)
5.4 Geology
BGS Geological Survey Map Extract - Superficial Deposits (Drawing 19158/711) indicates
superficial geology of Sheringham Cliffs Formation Sand and Gravel beneath the main
area of the site, and Happisburgh Formation Diamicton beneath the southernmost part of
the site. The BGS Geological Survey Map Extract - Bedrock (Drawing 19158/712) indicates
Crag Group bedrock (Sand and Gravel) beneath the site.
5.5 Hydrogeology and Hydrology
The site is located within Source Protection Zone 1 (Inner Catchment) (Appendix A).
Environment Agency Groundwater Maps indicate that the Chalk Bedrock is designated as
a Principal Aquifer. The superficial deposits on-site are designated as a Secondary A and
Unproductive Aquifers (Appendix A).
The site level is shown as 15-45m metres Above Ordnance Datum (AOD) (Drawing
19158/701). BGS Groundwater contours indicate groundwater flow from North-east to
South-west and an approximate groundwater level of 0-5m AOD (Drawing 19158/713).
Therefore, groundwater will be approximately 10-45m below ground level (BGL).
There is a surface water feature within 250m of the site; The River Yare (192m SE).
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The Oaks, Harvey Lane
5.6 Flooding
The Groundsure EnviroInsight Report (Appendix A) indicates the site is located within flood
zone 1. Flood Zones 2 & 3 are located to the south of the site; Zone 2 - 32m S and Zone 3
– 145m SE. There are no Flood Defences within 250m of the site or areas benefitting from
such defences. There are also no areas benefitting from flood storage within 250m of the
site.
The Groundsure EnviroInsight Report shows there are groundwater flooding susceptibility
areas within 50m of the boundary of the site, though based upon the underlying
geological conditions the highest susceptibility to groundwater flooding is ‘Limited
Potential’ (Appendix A).
5.7 Designated Environmentally Sensitive Areas
The site is designated as an Ancient Woodland by English Nature.
The site is designated as a Nitrate Vulnerable Zone (NVZ) by DEFRA (Appendix A).
5.8 Natural Hazards & Mining
The Groundsure EnviroInsight Report indicates a ‘Very Low’ hazard rating for Collapsible
Rocks, a ‘Low’ hazard rating for Shrink Swell, Landslide and Running Sand, and a
‘Moderate’ rating for Soluble Rocks and Compressible Ground.
There are no types of coal mining or brine affected areas within 75m of the site.
6.0 EXISTING SITE & WALKOVER
From historical maps, it has been observed that the site remained a residential dwelling
until circa 1975. From this point ‘The Oaks’ was recognised as a home for elderly care.
The main building B1 has remained entirely unchanged until approximately 1993 when a
small area of the eastern part of the building was no longer shown.
A site walkover was undertaken on the 30th June 2014. At the time of the walkover, the
following was observed:
The site was accessed from Harvey Lane to the west, which joins the Yarmouth Road to the
south. The main building B1 was found in a good condition (see photos 6, 8 & 24). The
building had been boarded up since its relatively recent closure as a children’s home
(information provided by client). The access from Harvey lane was a tarmac driveway;
leading up to The Oaks (see photos 1, 2, 4 & 5). This tarmac surface extended around the
northern side of the building, leading to a small car parking area immediately to the East
of the main building (see photos 10 & 11). Immediately to the south of the main building
B1 at ’The Oaks’ was an open overgrown lawn area (see photos 24 & 25). South, beyond
the main building and the lawn is a large area of mature trees and shrubs. This area
slopes downwards considerably to the southern boundary of the site. Nothing of any
significance was found in this area to the south. Embedded within the eastern brick wall
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19158/EP 6 July 2014
The Oaks, Harvey Lane
side of B1 was a small ventilated storage area with a gas main leading in. It is presumed
this is an area for the mains gas shut-off for the building.
In the northern area of the site are two small bungalows B2 and B3. These both were
situated close to each other in an area of the site north of the driveway.
To the north-east of The Oaks main building (B1) was located a Norfolk County Council
children’s home (B4). This building was a modern brick building and is accessed via the
same driveway access from Harvey Lane. The client did not permit for this area of the site
to be accessed. Therefore, this area of the site was not investigated during the site
walkover. Based upon information received from NPS we can only assume no sources of
contamination exist within this area of the site.
To the east of the site the boundary adjoins a children’s playing field. To the west, the site
meets Harvey Lane. To the south, the site runs all the way down to the Yarmouth Road
narrowly between Thorpe House School to the east, and Resthaven Nursing Home to the
west. To the north the site is bound by residential dwellings
No asbestos containing material (ACM) was encountered or observed during the site
walkover; however, no access was made to the interior of any of the buildings on site.
Therefore the presence of ACM cannot be confirmed.
7.0 PRELIMINARY CONCEPTUAL SITE MODEL
No significant potential on-site and off-site sources of contamination have been identified
from the Desk Study research, Groundsure EnviroInsight Report, Historic Maps or
Walkover Survey. Refer to the Preliminary Conceptual Model in Table 2 (A – D).
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ON SITE Sources - HISTORIC
Potential Source
Pathway
Receptor
Consequence /
Probability (RISK)
Reason
Further
Action
None
N/A
Principal Aquifer (Chalk) SPZ 1
Groundwater 10-45m BGL
Human Contact
Buildings/Services
N/A
N/A
None
Ta
ble
2A
. - P
relim
ina
ry C
on
cep
tua
l S
ite M
od
el
ON SITE Sources - CURRENT
Potential Source
Pathway
Receptor
Consequence /
Probability (RISK)
Reason
Further
Action
Car Park Area to the East of the Main
Building B
1
Vertical and Lateral Percolation of Mobile
Contaminants
Human Contact
Principal Aquifer (Chalk) SPZ 1
Groundwater 10-45m BGL
Human Contact
Buildings/Services
Mild/Unlikely
(VER
Y L
OW
)
There is very little linkage due to the
presence of tarm
ac surfacing, and no
evidence of any major staining or fuel spills
was seen during the walkover. Much of the
tarm
ac is also proposed for removal as part
of the development.
None
Ta
ble
2B
. - P
relim
ina
ry C
on
cep
tua
l S
ite M
od
el
OFF SITE CURRENT Sources (<100m from site)
Potential Source
Pathway
Receptor
Consequence /
Probability (RISK)
Reason
Further
Action
Thorpe St Andrew Historic landfill between
Yarm
outh Road and the River Yare (89m S)
Vertical and Lateral Percolation of Mobile
Contaminants
Principal Aquifer (Chalk) SPZ 1
Groundwater 10-45m BGL
Human Contact
Buildings/Services
Medium/Unlikely
(LO
W)
The landfill is located topographically much
lower (35m approx) than the majority of the
site. Therefore any vertical or lateral
percolation of mobile contaminants is
extrem
ely unlikely.
The developable areas of the site lie >300m
from the historic landfill. Therefore the
likelihood of gas migrating on to the site
and reaching site receptors is very low.
None
Ta
ble
2C
- P
relim
ina
ry C
on
cep
tua
l S
ite M
od
el
OFF SITE HISTORIC Sources (<100m from site)
Potential Source
Pathway
Receptor
Consequence /
Probability (RISK)
Reason
Further
Action
None
N/A
Principal Aquifer (Chalk) SPZ 1
Groundwater 10-45m BGL
Human Contact
Buildings/Services
N/A
N/A
None
Ta
ble
2D
- P
relim
ina
ry C
on
cep
tua
l S
ite M
od
el
19158/EP
The Oaks, Harvey Lane
7July 2014
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19158/EP September 2014
The Oaks, Harvey Lane
DRAWINGS
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N
Sit
e C
entr
e G
rid
Refe
rence
62
54
00
30
87
15
NPS
The Oaks
Harvey Lane
Norwich
Norfolk NR7 0BN
Site Location Plan
NTS
19158/701
0
July 2014
EP
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NPS
The Oaks
Harvey Lane
Norwich
Norfolk NR7 0BN
Existing Site Layout & Photograph
Locations
NTS
19158/702 0
July 2014 EP
N
Site Centre Grid Reference
625400 308715
Photograph number / location 1
Mature Trees and
Shrubs
Mature Trees and
Shrubs
Mature
Trees
and
Shrubs
Grass Area
Har v
e y L
ane
1
9
10 11
12
13
14
15 16
21
22
27
28
29
30
31
32 33
34
35 36
37
38
23
24
25
26
7
8
19
20
17
18
2
3 4
5
6
The Oaks
B1
B3
B2
B4
Historic Landfill
See Figure 19158/714
for more detail
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19
15
8/E
P
The
Oa
ks, H
arv
ey L
an
e So
urc
e: w
ww
.bg
s.a
c.u
k
Sheri
ngham
Clif
fs
Form
ati
on—
Sand a
nd G
rave
l
Happis
burg
h G
laci
genic
Form
ati
on - D
iam
icto
n
N
Sit
e C
entr
e G
rid
Refe
rence
62
54
00
30
87
15
NPS
The Oaks
Harvey Lane
Norwich
Norfolk NR7 0BN
British Geological Survey Map
Extract -- Superficial Deposits
NTS
19158/711
0
July 2014
EP
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19
15
8/E
P
The
Oa
ks, H
arv
ey L
an
e So
urc
e: w
ww
.bg
s.a
c.u
k
N
Sit
e C
entr
e G
rid
Refe
rence
62
54
00
30
87
15
NPS
The Oaks
Harvey Lane
Norwich
Norfolk NR7 0BN
British Geological Survey Map
Extract -- Bedrock
NTS
19158/712
0
July 2014
EP
Cra
g G
roup—
Sand
and G
rave
l
Chalk
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19158/E
P
The Oaks, Harvey
Lane
Contours of the Chalk
water table or pressure
surface
N
Sit
e C
entr
e G
rid
Refe
rence
62
54
00
30
87
15
NPS
The
Oaks
Harv
ey L
ane
Norw
ich
Norf
olk
NR7 0
BN
Hyd
rogeo
logic
al M
ap o
f N
ort
her
n
East
Anglia
Ext
ract
NTS
19158/7
13
0
July
2014
EP
Groundwater Direc
tion
North-east to South-w
est
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19158/EP
The Oaks, Harvey Lane
N
Sit
e C
entr
e G
rid
Refe
rence
62
54
00
30
87
15
10
0m
37
5m
NPS
The Oaks
Harvey Lane
Norwich
Norfolk NR7 0BN
Environment Agency Landfill Map
Extract
NTS
19158/714
0
July 2014
EP
Groundwater Direction
North-east to South-west
10
0m
20
0m
30
0m
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19158/EP September 2014
The Oaks, Harvey Lane
PHOTOGRAPHS
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19
15
8/E
P
Site
Ph
oto
gra
ph
s Ju
ne
20
14
Photo
1
Photo
2
Photo
3
Photo
4
Photo
8
Photo
7
Photo
6
Photo
5
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8/E
P
Site
Ph
oto
gra
ph
s Ju
ne
20
14
Photo
9
Photo
10
Photo
11
Photo
12
Photo
16
Photo
15
Photo
14
Photo
13
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19
15
8/E
P
Site
Ph
oto
gra
ph
s Ju
ne
20
14
Photo
17
Photo
18
Photo
19
Photo
20
Photo
24
Photo
23
Photo
22
Photo
21
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19
15
8/E
P
Site
Ph
oto
gra
ph
s Ju
ne
20
14
Photo
25
Photo
26
Photo
27
Photo
28
Photo
32
Photo
31
Photo
30
Photo
29
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19
15
8/E
P
Site
Ph
oto
gra
ph
s Ju
ne
20
14
Photo
33
Photo
34
Photo
35
Photo
36
Photo
37
Photo
38
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19158/EP July 2014
The Oaks, Harvey Lane
APPENDIX A