overview of environmental assessment (part 2)

A9 Dalwhinnie to Crubenmore Volume 3 – Environmental Drawings

Overview of Environmental Assessment (Part 2)

Drawing No. Drawing Type Drawing Title Projectwise Drawing Reference Software

6.9 CAD

6.10 CAD

6.11 CAD

6.12 CAD

6.13 CAD

6.14 CAD

CROSS SECTION

CROSS SECTION

CROSS SECTION

MITIGATION PLAN

MITIGATION PLAN

MITIGATION PLAN

MITIGATION CROSS SECTIONS



INDICATIVE SUDS MITIGATION



A9P08-CFJ-EGN-Z_ZZZZZ_ZZ-DR-LA-0001






Southboundon / off slip road

with verge

Existing ground level

Wet heath Woodlandedge planting

Access trackwith verge

Proposed A9Native woodland

B

B'

Peat mitigation area Native woodland Shrub planting

Wetgrassland

Native woodland for winter resilience

Deer fencing Deer fencing

Wet WoodlandProposed A9 SSE Aqueductdiversion and NMU

route

C

C'

Existing


Wet

Hea

th

Wet

Hea

th

Shrub planting withscattered trees


Proposed A9 Native woodland Accesstrack with verge

Wetgrassland

Wet woodlandNorthboundon/off slip road

with verge

Slope into area containingwet habitats, woodland

planting on higher ground toaid woodland connectivity

Native woodland for winter resilience

A

A'

Shrub planting Wet heath Woodland edgeplanting

Wet heath

Deer fencing

Deer fencing

PROJECT 8 - DALWHINNIE TO CRUBENMORE

DMRB STAGE 3DRAWING 6.9


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SCALE 1:500 @ A1

1 3 C01

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A3

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01/08/17

P01 03-08-17 DRAFT FOR COMMENT ST JFS3

P02 04-09-17 DESIGN UPDATE ST JFS3

P03 30-11-17 FINAL REVISIONS ST JFS3

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1. ALL DIMENSIONS IN METRES UNLESS STATED OTHERWISE.

GENERAL NOTES

SUIT APPDESCRIPTION BYREV

REVISION: SUITABILITY:

DATE

DESIGN: DRAWN: APP:CHK:

CH2M HILL Fairhurst JVC/O: City Park 368 Alexandra Parade Glasgow G31 3AU

Tel +44 (0)141 552 2000 Fax +44 (0)141 552 2525

Reproduced by permission of Ordnance Survey on behalf of HerMajesty's Stationery Office, © Crown copyright and database right 2017.All rights reserved. Ordnance Survey Licence Number: 100046668.

CÒMHDHAIL ALBA

Cross Section B-B' (ch.22,600)Scale 1:500

Cross Section C-C' (ch.23,550)Scale 1:500

Cross Section A-A' (ch.22,500)Scale 1:500

2. NATURAL STONE EFFECT TO RETAINING WALL FACINGSUBJECT TO DETAILED DESIGN AS ADDITIONAL MITIGATION.

THE DETAILED LANDFORM SPECIFICATION COVERS TWO LEVELSOF TREATMENT.

3. LEVEL 2 - LANDFORM SPECIFICATION TO CONSIDER TOPAND TOE ROUNDING, TAPERING AND LONG SECTIONVARIABILITY.

4. LEVEL 3 - INCLUDES SPECIFIC LOCATIONS WITHINLANDFORM SENSITIVE AREAS THAT WILL REQUIRE ADETAILED SPECIFICATION OF SIGNIFICANT VARIATION FORPARTICULARLY SENSITIVE, HIGHLY VISIBLE SLOPES.

5. STEEPENING OF SLOPES GENERALLY HAS BEENUNDERTAKEN TO MINIMISE THE ENVIRONMENTALFOOTPRINT OF THE PROPOSED SCHEME WITHINPARTICULARLY SENSITIVE AREAS, THEREFORE REDUCINGANY ASSOCIATED IMPACTS AND HABITAT LOSS WHEREPRACTICABLE.

6. OTTER / DEER / COMBINED (DEER / OTTER)ENVIRONMENTAL FENCING NOT SHOWN TO SCALE,ILLUSTRATIVE GRAPHIC ONLY.

Wetgrassland

Proposed A9Accesstrackand

verge

Wet heathExisting WetHeath

HMLrailway

SuDS basin with wet grassland

F'

Wet heath

Wet

Hea

th


F

Proposed A9Existing land betweenCuaich access road andthe Proposed Scheme

Existing landbetween

Cuaich accessroad and the

ProposedScheme

Existingland

EE'


See Note A See Note A

Native woodland mix Proposed A9 Dry Heath Proposedaccess trackand verge

Wet grassland / SuDS Basin Wet grassland

DD'

Shrubplanting

Acidgrassland

Acidgrassland






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CÒMHDHAIL ALBA

Cross Section F-F' (ch.28,150)Scale 1:500

Cross Section E-E' (ch.25,900)Scale 1:500

Cross Section D-D' (ch.25,800)Scale 1:500

Note A:Landform Sensitive Earthworks refined during detailed design stage to improve landscape fit by the following:

- Variation from a uniform slope- Evenness of slope- Rounding top / bottom of slope- Slope tapers







Acid grassland withscattered trees

Proposed A9Shrubplanting

withscattered

treesW

et G

rass

land

SuDS basin with wetgrassland

HMLrailway

AccessTrack

Shrub planting with scattered trees Existing

H

H'

Shrubplanting


Wet grasslandProposed A9Existing Wet heathHMLrailway

Accesstrackwith

verge

SuDS basin withWet Grassland

Wetgrassland

G

G'

1:10

1:2.5

Wet grassland



Otter Fencing

Otter Fencing




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CÒMHDHAIL ALBA

Cross Section H-H' (ch.30,650)Scale 1:500

Cross Section G-G' (ch.29,350)Scale 1:500

Note A:Landform Sensitive Earthworks refined during detailed design stage to improve landscape fit by the following:

- Variation from a uniform slope- Evenness of slope- Rounding top / bottom of slope- Slope tapers







Proposed A9 Wet woodland to increase woodlandconnectivity within this area

Shrub planting to base ofbank to blend into SuDS Basin

Wet grassland within basin. As vegetation establishes, aquatic species will emerge and create abasin that represents a natural feature with good visual amenity as well as biodiversity value

Dry heath on roadsideembankment mimicking

surrounding groundcover

A A'

Invert Level

Grass linedwatercourse

A

A'

Cuaich Underpass

Basin seeded with wet grasslandmix appropriate to local context

Gently sloping earthworks withinvaried slope gradients

Shape of basin 258 responds to itsconstrained location between A9 andaccess tracks to the east and west

Pockets of shrub planting to increasewoodland connectivity and reinforce east /west green infrastructure

Pockets of woodland and shrub planting toincrease woodland connectivity andreinforce east / west green infrastructure

Maintenance access track tying intoexisting access road

The orientation of basin 259 aligns with theorientation of the Allt Cuaich

Allt Cuaich

Slopes to western side of basin to blendinto the slopes that connect to the A9,creating a continuous landform thatconnects to the wider landscapeForebay overflow

Forebay overflow

Inlet headwall and reno mattress

Outlet headwall and reno mattress



Grass lined channel to watercourse

Proposed A9


DMRB STAGE 3DRAWING 6.12 - INDICATIVE

SUDS MITIGATION

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NC SWG


SCALE AS SHOWN

1 3 C01 A3

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P01 30-11-17 FINAL REVISIONS SDR JFS3

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CÒMHDHAIL ALBA

Cross Section Section A-A' (SuDS 259)Scale 1:200

Plan - SuDS 258 and 259 - Typical Design within a Woodland / Scrub ContextScale 1:500

2. BASIN TO HAVE A NATURAL PLAN PROFILE, ALIGNED WITHEXISTING CONTOURS WHERE POSSIBLE AND RESEMBLINGNATURAL GEOLOGICAL FEATURES THAT CAN BE FOUND INTHIS LANDSCAPE.

3. BASIN TO HAVE A NATURAL SLOPE PROFILE WHERE BELOWEXISTING GROUND LEVEL, INTERNAL AND EXTERNAL SLOPESSHOULD ACHIEVE GRADIENTS OF 1:4 OR SHALLOWERWHERE SPACE ALLOWS.

4. INLETS AND OUTLETS SHOULD USE NATURAL ROCK TOCREATE CASCADES, WHICH HAVE A 'NATURAL' APPEARANCE.

5. EXISTING SOILS AND HERB LAYER SHOULD BE STOCKPILEDAND RE-USED DURING THE CONSTRUCTION OF THE BASIN,WHERE POSSIBLE. DETAILED DESIGN FOR SEEDING ANDPLANTING SHOULD CONSIDER APPENDIX 6.1 AND THECHAPTER 6 ENVIRONMENTAL MITIGATION DRAWINGS 6.1-6.8.

Wet heath to mimic existing habitattypes within this open landscape

B B'

Wet grassland surrounding basin,also mimicking existing habitat types

SuDS basin planted with wet grassland as vegetationestablishes, a mixed and biodiverse planting

community will develop

Maintenanceaccess track

and verge

Proposed A9 planted with heathand grassland to tie into existing

landscape type

Temporary top water levelMicropool level

B

B'

Maintenance vehicle turning head

Basin seeded with wet grasslandmix appropriate to local context

Seeding to consist of wet heath and wet grassland withsome scattered trees surrounding proposed SuDSbasin to mimic surrounding open landscape context

Maintenance vehicle turning headProposed A9

Access track at base of A9 slope for SuDS maintenance

Highland Main Line railway

Micropool will aid and enhancebiodiversity


Inlet headwall andreno mattress

Forebay overflow




SUDS MITIGATION

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SCALE AS SHOWN

2 3 C01 A3

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CÒMHDHAIL ALBA

Cross Section Section B-B' (SuDS 282)Scale 1:200

Plan - SuDS 282 - Typical Design within an Open Heath / Grassland ContextScale 1:500


3. BASIN TO HAVE A NATURAL SLOPE PROFILE WHERE BELOWEXISTING GROUND LEVEL, INTERNAL AND EXTERNALSLOPES SHOULD ACHIEVE GRADIENTS OF 1:4 ORSHALLOWER WHERE SPACE ALLOWS.



Tying into existing landform / landscape withlocally appropriate grassland mix

C C'

Proposed A9Maintenance

accesstrack with

verge

SuDS basin planted with wet grassland, as vegetation establishes, amixed and biodiverse planting community will develop

Highland Main Line railway Native woodland to A9embankment

Existing verge to HighlandMain Line railway

Existing verge to HighlandMain Line railway

Temporary top of water level

Micropool level

C

C'

Wet grassland proposed to SuDS basin

River Truim

Planting comprising wet heath, acid grasslandand scattered trees to aid landscape fit andmimic surrounding habitats

Maintenance access track

Maintenance vehicle turning head

Proposed A9

Highland Main Line railway

Proposed retaining wall

Woodland planting to screen road from westand to increase woodland connectivity withinthe area

The basins long and thin plan profileresponds naturally to the existing context andfits well in this constrained location betweenthe River Truim and Highland Main Linerailway



Forebay overflow

Micropool will aid and enhancebiodiversity


Watercourse culvert withmammal crossing



SUDS MITIGATION

ER

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SCALE AS SHOWN

3 3 C01 A3

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CÒMHDHAIL ALBA

Cross Section 306 - Section C-C'Scale 1:200

Plan - SuDS 306 - Typical Design within Semi Open Woodland / Scrub ContextScale 1:500


3. BASIN TO HAVE A NATURAL SLOPE PROFILE WHERE BELOWEXISTING GROUND LEVEL, INTERNAL AND EXTERNALSLOPES SHOULD ACHIEVE GRADIENTS OF 1:4 ORSHALLOWER WHERE SPACE ALLOWS.



overview of environmental assessment (part 2)

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