Llyn Tegid Reservoir Safety Project Phase 1 Habitat Survey ... · The survey was carried out by...

Llyn Tegid Reservoir Safety Project

Phase 1 Habitat Survey Report for additional site

areas and validation

September 2019

This page intentionally left blank

Natural Resources Wales Phase 1 Habitat Survey Report

Black & Veatch Limited 122918/2019

i

PHASE 1 HABITAT SURVEY REPORT FOR ADDITIONAL SITE AREAS

CONTENTS

1. INTRODUCTION 1

1.1 Background ................................................................................................................................. 1

1.2 Scope of Survey .......................................................................................................................... 1

2. METHODS 1

3. LIMITATIONS 1

4. RESULTS 2

4.1 Habitats Recorded ...................................................................................................................... 2

4.2 Potential for Protected Species .................................................................................................. 3

5. RECOMMENDATIONS 4

6. REFERENCES 4



ii

Details of document preparation and issue:

Version

no. Prepared by Reviewed by Authorised for issue Issue date Issue status

P01 Gary Noble Emma Stevens Stephen Cavanagh 06/08/19 For comment

P02 Gary Noble Emma Stevens Stephen Cavanagh 20/09/19 Final

B&V project no. 122918 Client’s reference no.

Notice:

This report was prepared by Black & Veatch BV Ltd solely for use by Natural Resources Wales. This report is not

addressed to and may not be relied upon by any person or entity other than Natural Resources Wales for any purpose

without the prior written permission of BV Ltd. BV Ltd, its directors, employees and affiliated companies accept no

responsibility or liability for reliance upon or use of this report (whether or not permitted) other than by Natural

Resources Wales for the purposes for which it was originally commissioned and prepared.

In producing this report, BV Ltd has relied upon information provided by others. The completeness or accuracy of this

information is not guaranteed by BV Ltd.



1

1. INTRODUCTION

1.1 Background

Natural Resources Wales (NRW) are proposing to undertake safety modifications to the

impounding structures at Llyn Tegid, Gwynedd, North Wales. Llyn Tegid is a natural lake

with approximately 2,950m of embankment at its northern end. The outflow is controlled

by Bala Sluices, which is a gated control structure that controls the combined outflow from

Llyn Tegid and the Afon Tryweryn. This allows Llyn Tegid to be used for flood control and

to regulate the River Dee downstream.

The proposed modifications to the existing water impounding structures comprise of

reinforcement of landward / downstream embankment faces with buried 3D geotextile

mat (Enkamat or similar) and upgrading of existing rip rap upstream slope protection on

the lake embankment with additional imported stone material.

1.2 Scope of Survey

A Preliminary Ecological Appraisal (PEA) for the Project area was carried out by Enfys

Ecology (2017) which included a Phase 1 habitat plan of the Project area. Since then the

Project has developed and additional areas were added to the Project that are to be used

for site compounds, construction access routes and potential habitat enhancement areas

(referred to as the ‘survey area’ within this report). This Phase 1 habitat report only covers

the additional areas and does not cover all the Project area as this has already been

completed in 2017 (Yardley 2017) and by a more recent Phase 1 habitat report completed

by Exegesis in 2018 (Lush 2018). During this survey, however, habitats were validated from

the 2017 survey to see if any habitats have changed significantly.

This report is to be used as an addendum to the existing PEA, which can both be used to

support the Project planning application.

2. METHODS

The survey was carried out by Black & Veatch’s Ecologist, Gary Noble on the 17th July 2019.

The additional areas for the Project were walked by the ecologist and the habitats mapped

and classified using the standard Phase 1 habitat survey methodology (JNCC 2010). Notes

were taken on the habitats present and target notes were used to record any habitats and

features of note, including the dominant plants that were present. The survey area can be

found in the Phase 1 habitat survey drawing in Appendix 2 and the target notes can be

found in Appendix 1.

During the survey, habitats were also assessed for their suitability to support protected

and notable species, and field signs indicating their presence or absence were recorded.

The distribution and extent of widespread, visible invasive non-native species (INNS) were

also noted where found. A systematic survey for INNS was not conducted as part of this

survey.

3. LIMITATIONS

The survey undertaken for this report does not comprise a full list of plants and animals

that may be present within the survey area. The protected species appraisal provides a



2

preliminary view of the likelihood of protected species occurring at the survey area. It

should not be taken as providing a full and definitive survey of any protected species group.

4. RESULTS

4.1 Habitats Recorded

Improved/poor semi improved neutral grasslands

The majority of the fields in the survey area were classed as improved neutral grasslands

that at the time of survey had been recently managed through mowing (Target notes 2 and

9). Other improved fields in the survey area at the time of survey were currently being

used to graze sheep and cattle (Target notes 12, 14 and 15). Species diversity and

composition within improved fields is generally low only containing species that are

indicative of improved neutral grasslands. Other areas of grassland within the survey area

contained unmanaged grassland habitat that were classed as poor semi improved

grassland (Target notes 13 and 18) as species diversity within these grasslands was

generally more diverse. The area of grassland on the island (Target note 22) has been

classed as semi improved grassland due to more species of flowering plants present.

Hedgerows

Hedgerows within the survey area were classed as species poor hedgerows containing five

or less woody species (Target notes 1, 4, and 16). Hedgerows were usually intact with

minimal gaps with some hedgerows containing standard broadleaved trees within the

hedgerow line (Target note 11).

Scattered broadleaved trees

The majority of the field boundaries within the survey area contained a mixture of mature

broadleaved trees (Target notes 5, 6, 7, 8, 10 and 17). Trees generally in good condition

with some trees clad with thick ivy.

Ditch

Only one ditch recorded within the survey area. At the time of survey, the ditch contained

running shallow water (Target note 4).

Invasive and non-native plants

Invasive plants such as Indian balsam Impatiens glandulifera and Japanese knotweed

Fallopia japonica are known to be within the area. Indian balsam is present and managed

along the foreshore of the lake and within the riparian habitats along the rivers within the

survey area. Monkeyflower Mimulus guttatus is present along a ditch (Target Note 4).

Validation of habitats from previous phase 1 habitat surveys

The majority of the habitats recorded from the 2017 and 2018 phase 1 habitat surveys

have not changed significantly since this survey in 2019. Differences occur in classifying

the neutral grasslands. The Enfys 2017 survey has classed some areas as poor semi

improved grassland, whereas the Exegesis report has classed them as semi improved

grassland around the meadow areas adjacent to the rivers. This is likely that the 2017

survey was carried out in October and some of the flowering species recorded in the 2019



3

survey were not visible in the autumn. This survey from 2019 has classified some of the

meadow areas on the island as semi improved neutral grassland due to presence of more

flowering plant species.

4.2 Potential for Protected Species

Bats

From biological records and recent surveys, bats are known to be using the survey area for

foraging and commuting. The mature trees along the various field boundaries have

potential to support roosting bats as they contain potential roosting features (PRFs) such

as holes, cracks and broken limbs. Some large mature trees also are covered in ivy which

are likely to obscure further PRFs.

Badgers

No badger setts or signs were observed within the survey area. The habitats within the

survey area are generally suitable to support badgers given the presence of suitable

foraging areas and areas where setts could be newly created, particularly along field

boundaries.

Breeding birds

The habitats within the survey area, such as trees and hedgerows have good potential to

support breeding birds.

Great crested newts (GCN)

The Enfys 2017 PEA report stated that there are no records of GCN within the area. The

pond within the survey area (Target note 19), at the time of survey was mostly dry and

contained no water. Given the lack of records and no suitable waterbodies within the

general area, GCN are unlikely to be affected by the proposed works.

Otters

Otters are known to be present within the area and are known to use the lake foreshore

and the rivers close to the proposed construction areas. Within the survey area there were

no suitable rivers that could support otter, but adjacent terrestrial habitat could be used

for otter holts and resting areas.

Reptiles

The Enfys 2017 PEA report stated there are no records of reptiles within the survey area.

Suitable habitat for reptiles exists along some field boundaries within the survey area, such

as rough unmanaged grassland strips and the meadow areas that are adjacent to the river

(Target notes 3, 4, 13, 18, 21 and 22). Slow worms have also been reported to be present

within the Rip Rap areas along the foreshore of the lake. No slow worms were observed

during the site investigations works that took place in June 2019.



4

5. RECOMMENDATIONS

The recommendations in this report are for the survey area only. Reference should also

be made to the Enfys 2017 PEA report which details the recommendations for the entire

Project.

• Field boundaries and buffer zones – the boundaries of the fields should be

protected from any compound construction by creating buffer zones around the

field boundaries to protect tree protection zones (informed by an arboricultural

survey), ditches and any unmanaged grass strips that are present along some of

the field boundaries. Encroachment should be prohibited into the buffer zones at

all times;

• Bats – if any mature trees are affected by construction compounds or access routes

then further detailed assessments will be required to assess the tree/s suitability

to support bat roosts. If suitable and the tree will be impacted by proposed works,

then further surveys will be required either through or in combination with tree

climbing surveys to inspect PRFs followed by dawn/dusk emergent/re-entry

surveys;. Any works that effects bat roosts should be undertaken under license

from NRW;

• Breeding birds - Any vegetation removal required for a site compound or access

routes to be removed outside the breeding bird season. The main breeding bird

season is considered to be between March and September;

• Reptiles – areas of rough unmanaged grassland located on the borders of some

field boundaries to be protected. If these are to be disturbed for a site compound

and/or any construction access routes, then sensitive habitat removal should be

completed prior to works to discourage reptiles from the working area. This type

of method should only be used for small areas and includes removing the grassland

habitat in a two stage sensitive cut under ecological watching briefs;

• Badgers – a pre-construction check should be made before construction of the site

compound to ensure no new setts have been created close to proposed works;

• Otters – a pre-construction check for otters along rivers and in areas along field

boundaries close to the lake foreshore; and

• Invasive species – any invasive species should be dealt with in line with the Projects

invasive species management plan.

6. REFERENCES

JNCC (2010) Handbook for Phase 1 Habitat Survey: A Technique for Environmental Audit.

First published 1990; reprinted in 1993; reprinted in 2003 with limited revisions &

additions; reprinted in 2004; reprinted in 2007 with minor additions; reprinted in 2010

Lush M J (2018) Aerial, Phase 1 and NVC Survey Report – Llyn Tegid Reservoir Safety

Project, Exegesis. Version 4.

Yardley T (2017) Preliminary Ecological Appraisal Survey Report – Llyn Tegid Embankments,

Enfys Ecology.



5

APPENDIX 1 – Phase 1 habitat target notes

TN 1

Unmanaged species poor intact hedgerow

on perimeter of field and adjacent leisure

centre. Woody species included ash

Fraxinus excelsior, hawthorn Crataegus

monogyna, blackthorn Prunus spinosa

and dog rose Rosa canina. Hedgerow

understorey included abundant common

nettle Urtica dioica and common bent

grass Agrostis capillaris with occasional

red campion Silene dioica, common

cleavers Galium aparine and bramble

Rubus fruticosus.

TN 2

Grassland habitat that had been recently

mown. Improved neutral grassland

habitat containing common species such

as perenial rye grass Lolium perenne,

meadow foxtail Alopecurus pratensis and

flowering species such as meadow

buttercup Ranunculus acris, daisy Bellis

perennis, white clover Trifolium repens,

ribwort plantain Plantago lanceolata and

scattered common dock Rumex acetosa.

TN 3

Hedgerow bank located on the field

boundary adjacent to the A494. Good

mixture of grasses and flowering plants

such as false oat grass Arrhenatherum

elatius, cocksfoot Dactylis glomerata,

common bent and Yorkshire fog Holcus

lanatus, meadow vetchling Lathyrus

pratensis, black knapweed Centaurea

nigra and meadow sweet Filipendula

ulmaria.



6

TN 4

Shallow running ditch along the field

boundary with adjacent rough

unmanaged buffer. Species included

hemlock water dropwort Oenanthe

crocata, water mint Mentha citrata,

monkeyflower Mimulus guttatus and

meadow sweet. Adjacent young hazel

Corylus avellana hedge located on the

field boundary next to the ditch.

TN 5

Row of mature trees on field boundary.

Most of the trees were ash with the

occasional beech Fagus sylvatica tree.

Some trees have suitability for roosting

bats which contained potential roosting

features (PRFs) such as cracks, knots and

hollows within trees that could be used as

bat roosts. Some trees covered in ivy,

which may obscure any further PRFs.

TN 6

Row of mature ash and beech trees with

PRFs on field boundary.

TN 7

Row of mature ash and beech trees with

PRFs on field boundary.



7

TN 8

Row of mature, ash, oak Quercus sp,

beech and sycamore Acer pseudoplatanus

trees with PRFs on field boundary.

TN 9

Improved neutral grassland habitat that

had been recently mown. Species

diversity of grassland low, containing

species such as perennial rye grass, white

clover and occasional meadow buttercup.

TN 10

Row of mature ash and oak trees on the

northern boundary of the field with PRFs.

TN 11

Intact species poor hedgerow with trees

on the boundary of the field. Good

mixture of woody species such as

hawthorn, hazel, blackthorn, elder

Sambucus nigra and dog rose. Within

hedgerow are semi mature ash trees.

Understorey of hedgerow containing

abundant nettle and common cleavers

with red campion.



8

TN 12

Improved neutral grassland habitat that

at time of survey was being grazed by

cattle. Scattered throughout field was

frequent creeping thistle Cirsium arvense.

TN 13

Grassland area currently being used as

meadow habitat. Grassland dominated

by Yorkshire fog and common bent

grasses. Mixed within the grassland was

occasional greater birdsfoot trefoil Lotus

pedunculatus.

TN 14

Improved neutral grassland habitat that is

currently being grazed by sheep. More

diversity of grasses in these fields

compared to others, including species

such as common bent, Yorkshire fog,

sweet vernal grass Anthoxanthum

odoratum, crested dogstail Cynosurus

cristatus and scattered creeping

buttercup.

TN 15

Wet flush within field containing

dominant soft rush Juncus effusus. Area

surrounded by improved neutral

grassland currently being grazed by

sheep.



9

TN 16

Species poor intact hedgerow separating

field. Hedgerow dominated by hawthorn.

TN 17

Row of mature ash and oak trees on the

northern boundary of field with PRFs.

TN 18

Large area of meadow habitat adjacent to

the river. Grasses such as Yorkshire fog

and common bent dominate the sward

with occasional greater birdsfoot trefoil.

TN 19

Small pond at time of survey was dry.

Vegetation dominated by common reed

Phragmites australis and reedmace Typha

latifolia. The remainder of the vegetation

contained bramble and dominant

common nettles.



10

TN 20

Recently mown grassland area adjacent

to the Natural Resources Wales office

proposed for a small satellite compound.

TN21

Area of grassland habitat adjacent to the

river. Grasses such as Yorkshire fog and

common bent dominate the sward with

occasional greater birdsfoot trefoil and

scattered meadow buttercup. Scattered

in the area was osier willow Salix

viminalis.

TN22

Area of grassland habitat on island

adjacent to the river. Sward dominated

by Yorkshire fog and common bent

grasses with occasional birdsfoot trefoil,

back knapweed and selfheal Prunella

vulgaris.

TN23

Large open area of managed grassland

habitat. Sward dominated by Yorkshire

fog and common bent grasses.



11

APPENDIX 2 – Phase 1 habitat plan

Dismantled

Railway

19

28 27

26

Stones24

2

Car Park

School

16

1

61

7

1

12

8

5

2

Football Club

6

4

1

Cae G

adlas

Cattle Market

6

16

Hous e

165.0m

164.8m

167.5m

PW

15 15A

59

Sinks

Playing Field

164.6m

27

12

16

1

59

Glannant

Council Yard

HEOL YR O RSAF (STATION ROAD)

29

4

13

14

1

15

Offices

LB

TCB

48

26 Posts

4

26

40

y Bala

Lodge

Fire

Tower

Posts

Motte

Ambulance Station

50

STRE

ET)

(MOUNT

Bro Er

yl

Maes y B

ronydd

15

Bank

24

2

42

79

69

1

Gorsedd Circle

17

32

19

1

9

A 494

PO

PontTrywerynor Pont

LÔN Y DOMEN (MOUNT LA)

HEOL Y DOMEN

PH

Hall

7

4

37

40

Issues

36

37

43

38

12

TCB

Pleasant View

Maes- y-dre

31

28

1

4

PH

ElSubSta

Ysgol Bueno Sant

HEOL ARENIG (A

RENIG STREET)

64

49

El Sub Sta

Station

10

1

11

2

1

CAMBRIAN TERR

STRYD YR EGLW YS

HEOL BERWYN

Rhiwdery n

164.7m

A 4212

53

Office

Tomen y Bala

1

7 t o 8

25

39

12

PC

Statue

47

53

70

49

PC

31

24

14

20

13

7

12

Rh iwlas

HEOL Y CASTELL (CASTLE STREET)

34

910

PW

21

7

3

30

23

Sta

13

TrywerynTerrace

10

7

Church

2

52

Plas yn Ddol1 t o

10

B 4391

El Sub

B 4391

15

Post

Ty Br yn

aly nPosts

Bowling Green

Playground

Drain

Castell Gronw

Pond

12

DW Merddwr

Ford

Sluice

Flood WaterSalmon

5

B 4391

Met Station

8

Spring

B 4391

Pen-y-bont

Weir

River Dee

Sloping masonry

Sloping masonry

Bryn Llysg

Weir

Pond

Afon Tryweryn

Sloping masonry

Track

Sloping masonry

B 4391

El Sub Sta Sloping masonry

Sewage Works

Sloping masonry

Cattle Grid

15

Motte and Bailey

Council Depot

Issues

Sloping masonry

Drain

DW

9

Steps

LB

B 4391

14

Mast

7

Bala Enterprise Park

13

DW

Sloping masonry

Parc Menter Bala

Scrap

Yard

16

B 439

1

Ty'n-y-gwrych

/ Afon Dyfrdwy

Bryn-yr- aber

Spring

Path (um)

Channel

Afon Tryweryn

FB

164.3m

Track

Sheep Pens

Merddwr

Pond

PW

117

23

6

25

97

Tel Ex

Car Park

1

2

Pen-y- bont

12

STRY D Y FRON

13

28

War Mem

l

Car Park

Glascoed

HEOL TEGID/TEGID STREET

89

River Dee

Blaen-y -Wawr

Path

(um)

Grug Awel

LB

163.8m

4

81

43

59

3

13

35

Llyn Tegid or Bala Lake

103

Caer Y nn

PW

8

B 4403

Cinema

23

Pol Sta

19

16

63

54

52

Parc Menter Bala

44

38

Ysgol B

ro Teg

id

Drain

50

72

5

17

6

HEOL Y DOMEN (M

OUNT STREET)Bank

1

3

Red L ion Farm

Path

Rhes dai Arenig

8

83

HEOL PENSARN/PENSARN ROAD

Path

(um)

32

Posts

TRE M-Y-

MAWNOG FACH

52

8

Town

52

93

6

TCB

LB

El Sub Sta

9

3

9

72

17

Gerddi

3

45

PC

165.0m

11

4

Pengwern

Hall

Leisure Centre

HEOL ARAN/ARAN STREET

Tawe

LB

Pont

Issues

SM

24

10 3

Hi rnant

Hotel

3

55

MAE S TEGID

58

6

10 7

B 4391

Bro Eryl

77

2

12

1165

Glannau

59

Plas yn A cre

/ Afon

Clwydfa

Station

11

1

6

2

9

YSTAD CAE BACH

82 31

Dyfrdwy)

Sub Sta

Ffordd y

y Bronydd

60

20

Path

1

TCB

Garage

Sewage Pumping

Glan Celyn

23

Depot

Cwm

22

Sinks

6

Mwnwgl-y-llyn

Garage

163.4m

71

15

25

30

Cottage

13

11

88

33

B 439

1

Plas Teg

164.3m

B 4403

Playing Field

16

46

34

3

Telos

44

12

164.3m

PW

21

Berwy nfa

Tegid

Bryn Brial lu

13

Maes y

Gerddi

43

18

B 4391

22

96

102

90

B 4391

4

Ffynnon

PH

92

19

70

18

25

76

1

6

Bryn MyfanwyStatue

7

21

10

HEOL PLASEY /P

LASEY STREET

1

24

Path (um)

64

66

23

Hamdden

PW

29

6

94

13

30

7

98

10

105

5

164.3m

31

18

35

1

Hall

5

9

A 494

25

6

FFRIDD

39

Bala Enterprise Park

HEOL ARENIG/ARENIG STREET

1

Pros Kairon

Y STRYD FAWR/HIGH STREET

12

Y PARCIAU

The Cottage

46

9

18

El

73

1

60

163.4m

LB

1

Canolfan Hamdden

Maes

Hall

ROMAN ROAD

65

Y BALA

Penllyn

40

68

46

2

4

11

1

5

Brenarth

Co ur t

Tyddyn Llwyn

Garth Bueno

ENCI L PENSA RN

Cys god y Coed

Hafod y Nant

Rhos lyn

16

Th e1to3

4to 7

LLAIN DEG

2

5

8

Cae Gadlas

Yr Hafan

9

7Llynor

6

Rhesdai'r P

las 1 to 3

Awel y L ly n

1

Posts

12a

26

9

10

4 Afal lon

18

2

2a

Pond

Track

CR

ED Bdy

CF

CR

Und

CC

CC

Und

ED Bdy

CR

ED Bdy

ED Bdy

CL

CR

Mast

Mast

PublicWaste DisposalSite

Ysgol-y-berwyn

5

6668

Pond

Stand

Track

Tanks

SM

Pond

Drain

Stabal

Bryn Y Groes

LletyR Wennol

Bythynnod

Yr Aran

1

6

Hall

Rhesdai'r B

erllan2

52

PH

3

1

5

6

4

ArenigRow

(Football Ground)

PH

Pavilion

Y STRYD FAWR / HIGH STREET

Rh an da i Pen llyn

1to6

14

1 23 4

5

6

7

8

9

10

11

12

13

14 15

16

17

18

1920

21

2322

292500

292500

293000

293000

293500

293500

3350

0033

5500

3360

00R:\

Projec

ts\1229

18_Lly

n_Tegi

d_De

sign_a

nd_P

lannin

g\8_W

orkspa

ces\2_

Issue_

Maps\

122918

-BVL-Z

0-00-D

R-I-00

007.mx

d ohr

81786

30/0

7/2019

Project:

Drawing title:

Drawing scale:

Drawing no.

Sheet size:

Revision

Client Drawing No. Revision

ClientDesigned by:

Rev Drawn Chkd Rvwd Apprvd Date Description

The limits, including the height and depths of the Works, shown inthis drawing are not to be taken as limiting the obligations of thecontractor under Contract.

Note:

0 40 80 120 160 200Metres

@ A3

P01

1:5,000

P1HS SURVEY

Date:ZO

© Copyright Black & Veatch Ltd. 2019

Reproduced by permission of Ordnance Survey on behalf of HMSO.© Crown copyright and database rights 2019. Ordnance Survey Licence number 100019741

SCALE

P01 ZO

1:5,000 A3

Print Version: Print Quality (300dpi @ A3)

JULY 2019

30/07/2019ES

LLYN TEGIDPLANNING AND DESIGN

SUITABLE FOR INFORMATION

122918-BVL-Z0-00-DR-I-00007

Contains OS data © Crown Copyright and database right 2019

LEGEND:SURVEY AREATARGET NOTEG2 RUNNING WATERJ2.1.2 INTACT HEDGE - SPECIES-POORJ2.3.2 HEDGE WITH TREES - SPECIES-POORJ2.4 FENCEJ2.5 WALLA1.1.1 BROADLEAVED WOODLAND -SEMI-NATURALA3.1 BROADLEAVEDPARKLAND/SCATTERED TREESB2.2 NEUTRAL GRASSLAND - SEMI-IMPROVEDB4 IMPROVED GRASSLANDB6 POOR SEMI-IMPROVEDGRASSLANDF2.2 MARGINAL AND INUNDATION -INUNDATION VEGETATIONG1 STANDING WATERJ4 BARE GROUND

Registered Office60 High Street, Redhill, Surrey RH1 1SH, United Kingdom

Tel: +44(0)1737 774155 E-mail: [email protected]

Black & Veatch Limited

SAFETY, HEALTH AND ENVIRONMENTAL INFORMATIONIN ADDITION TO THE HAZARDS OR RISKS NORMALLY ASSOCIATEDWITH THE TYPES OF WORK DETAILED ON THIS DRAWING, THEFOLLOWING SIGNIFICANT RESIDUAL RISKS SHOULD BE NOTED.FURTHER DETAILS ARE INCLUDED IN THE CDM DESIGN RISKMANAGEMENT REGISTER

NOT APPLICABLE

NOT APPLICABLE

NOT APPLICABLE

CONSTRUCTION :

MAINTENANCE, CLEANING AND OPERATION :

DECOMMISSIONING OR DEMOLITION :

GN

ISI

SC

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