contamination report desk study - broadland · 2014. 9. 26. · 19158/ep 2 july 2014 the oaks,...

CONTAMINATION REPORT

DESK STUDY

Job No. 19158

Proposed Development

The Oaks

Harvey Lane

Thorpe

Norwich

NR7 0BN

Client: NPS

July 2014

exyar1553

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

19158/EP 2 July 2014


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’

19158/EP 3 July 2014


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.

19158/EP 4 July 2014


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).

19158/EP 5 July 2014


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

19158/EP 6 July 2014


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).

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



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



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



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


7July 2014

19158/EP September 2014


DRAWINGS

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

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

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

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

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

19158/EP


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

19158/EP September 2014


PHOTOGRAPHS

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

19

15

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

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

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

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

19158/EP July 2014


APPENDIX A

contamination report desk study - broadland · 2014. 9. 26. · 19158/ep 2 july 2014 the oaks,...

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