REPORT Bremangerlandet vindkraftverk - planfase
CLIENT Bremangerlandet Vindpark AS
SUBJECT Geotechnical pre-investigation
DATE: / REVISION: September 12, 2019 / 00 DOCUMENT CODE: 10211972-RIG-RAP-001
This report has been prepared by Multiconsult on behalf of Multiconsult or its client. The client’s rights to the report are regulated in the relevant assignment agreement. If the client provides access to the report to third parties in accordance with the assignment agreement, the third parties do not have other or more extensive rights than the rights derived from the client’s rights. Any use of the report (or any part thereof) for other purposes, in other ways or by other persons or entities than those agreed or approved in writing by Multiconsult is prohibited, and Multiconsult accepts no liability for any such use. Parts of the report are protected by intellectual property rights and/or proprietary rights. Copying, distributing, amending, processing or other use of the report is not permitted without the prior written consent from Multiconsult or other holder of such rights.
10211972-RIG-RAP-001 September 12, 2019 / 00 Page 2 of 10
REPORT
PROJECT Bremangerlandet vindkraftverk - planfase DOCUMENT CODE 10211972-RIG-RAP-001 SUBJECT Geotechnical pre-investigation ACCESSIBILITY Open CLIENT Bremangerlandet Vindpark AS PROJECT MANAGER Asle Juul CONTACT Lars Johan Sivertsen PREPARED BY Christoffer Taule COORDINATES SONE: 32 EAST: 291160 NORTH: 6867002 RESPONSIBLE UNIT Multiconsult Norge AS GNR./BNR./SNR. 17 ET AL. / / / Bremanger
SUMMARY This report summarizes the geotechnical pre-investigation that was conducted at the site of Bremangerlandet wind farm on the behalf of Bremangerlandet Vindpark AS. The site is characterized by blockfield in the west, marshland in the center and astern part, and rock outcrops in the southern part and by T5-T8. The depositional thickness seldom reach more than one meter in thickness; however, the soil thickness in the western part could not be estimated during the survey. Therefore, Multiconsult Norge AS suggests that further investigation is conducted – either with a drill rig in the design phase or with an excavator during the construction phase.
00 12.09.2019 Ready for dispatch Christoffer Taule Hilde Sunde Tveit Asle Juul REV. DATE DESCRIPTION PREPARED BY CHECKED BY APPROVED BY
MULTICONSULT | Nesttunbrekka 99 | N-5221 Nesttun, Norway | Tel +47 55 62 37 00 | multiconsult.no NO 918 836 519 VAT Bremangerlandet vindkraftverk - planfase multiconsult.no Geotechnical pre-investigation TABLE OF CONTENTS
TABLE OF CONTENTS
Drawings ...... 4 Appendix ...... 4 1 Introduction...... 5 1.1 Site investigation ...... 5 2 Basis ...... 5 3 Observations ...... 7 4 Limitations ...... 7 5 Recommendations ...... 7 Appendix 1 – fieldwork notes ...... 8
Drawings 10211972-RIG-TEG-001 Infrastructure -TEG-002 Deposits
Appendix Appendix 1 - data from each sounding
10211972-RIG-RAP-001 September 12, 2019 / 00 Page 4 of 10 Bremangerlandet vindkraftverk - planfase multiconsult.no Geotechnical pre-investigation 1 Introduction
1 Introduction Bremangerlandet Vindpark AS is planning to build a wind farm on Bremangerlandet in Bremanger municipality in western Norway, and has hired Multiconsult Norge AS to design it. Wind turbines are large structures that require extensive infrastructure, and each of the turbines apply a large load on the ground. A successfully designed wind farm require extensive knowledge of the ground conditions. Multiconsult Norge AS was therefore asked to investigate the ground condition in terms of depth to rock and the quality of the bedrock at the turbines sites and for the construction road between the turbines. Furthermore, if the soil thickness is large, Multiconsult Norge AS was asked to plan a drilling program to gain more information about the ground condition at the turbine sites and the accompanying infrastructures. The rock mass related ground investigations are presented in 10211972-RIGberg-RAP-001. This report describes the ground condition from the with respect to soil and gives recommendation for further actions.
1.1 Site investigation The ground conditions for the areas for the turbine foundation and the centerline for the road was investigated by Christoffer Taule from Multiconsult Norge AS on August 28th and 29th. The depositional thickness was checked with a steel rod.
2 Basis Figure 1 shows that the area is currently accessible from the western and eastern periphery. There exists exposed rock in the westernmost- and easternmost areas, while there are few exposures in the central part. Figure 2Error! Reference source not found. shows the quaternary deposits on the island, as mapped by NGU. The area consists mainly of thin moraine cover with some scattered rock outcrops (mainly western- and eastern periphery), peat deposit (in the center), weathering material (Steinfjellet) and thick moraine cover (Oldeide). The map is based on surveys of the terrain surface. The turbine points and accompanying infrastructure are shown in 10211972-RIG-TEG-001 Infrastructure.
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Figure 1: The site for Bremangerlandet wind farm (source: https://norgeskart.no ).
Figure 2: Sedimentary map of Bremangerlandet. Weathering material (purple), marshland (brown), rocky terrain (pink), thin moraine cover (light green) and thick moraine cover (green). The infrastructure is within the marked area (source: http://geo.ngu.no/kart/losmasse/).
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3 Observations The observations that were made during the fieldwork are given in Chapter 0 and summarized in drawing No. 10211972-RIG-TEG-004. The pictures from the work were uploaded on the file server that Vestavind Energi AS (Bremangerlandet Vindpark AS) shared with Multiconsult Norge AS. Generally, boulders characterize the western area, which locally is covered by a thin vegetation cover or peat deposit, of unknown thickness. The central area (east of T12, as shown in drawing No. 10211972-RIG-TEG-003) is dominated by marshland with peat deposit that is locally thicker than 1.2 m (stop due to high resistance); this area contains few boulders and some outcrops. Rock outcrops characterize the area at T5 to T8 (see drawing No. 10211972-RIG-TEG-003) and there are locally peat deposits with thicknesses of less than 1.0 m. Furthermore, rock outcrops dominate Blåfjellet (southeastern area), whereas marshland characterize the area where the access road from Oldeide is to be established; the depositional thickness of the peat is up to 1.0 m here.
4 Limitations The depositional thicknesses was checked with a steel rod. Registrations at the road were made along the centreline. There may be places where the thickness succeed the registered maximum thickness. The steal rod penetrates into peat, but will stop in the transition to harder resistance materials such as sand. Multiconsult Norge AS takes no liability for potential financial overruns that may be caused by data in this report.
5 Recommendations The thickness to solid rock is generally less than 1.0 m in the areas east of T11, as seen in Figure 3. With the used equipment, Multiconsult Norge AS was not able to estimate the thickness to solid rock for most of the areas west of T11. Therefore, Multiconsult Norge AS recommend that the depth to solid rock is estimated by soundings with a drilling rig or test pits dug with an excavator. The investigation can be done during the study- or at the start of the construction phase.
Figure 3: Area with uncertain soil thickness
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Appendix 1 – fieldwork notes OBJECT- x y Comment ID
1 288702 6867213 T18: undulating terrain. Some outcrops at the highs, but vegetation cover in the depressions. A lot of loose boulders and large resistance to the steel rod. At least 0.5 m thick peat deposit, but difficult to determine the depth to solid rock.
2 289017 6867137 North towards T17: Blockfield that is partly covered by vegetation cover. Northeast of T17: there is sloping terrain that is unsuitable for a drill rig. Sporadical thickness of 0.4 m.
3 289272 6867184 Exposed rock. Some exposed rock visible in the road, but it is also up to 1 m thick layer of organic material along the road. Easy access with drill rig.
4 289601 6867031 There's a blockfield southeast of this point. There are no visible rock in the road. A lot of vegetation.
5 289597 6866499 Northeast: blockfield, which mostly covered by vegetation. Marshland (with standing water) starts 110 m north of T13 and there is a stream 66 m north of the T13. There are no signs of boulders and the peat deposit is up to 0.5 m thick. There are boulders underneath the marshland and not solid rock.
6 289296 6866216 Towards T14: peat deposit with thickness 0.5 m registered. Blockfield at T14. The access to T14 with a drill rig can be difficult; must either cross marshland and a stream or drive down a steep slope."
7 289786 6867007 Towards T16: blockfield at the crossroad. Thereafter vegetation cover with registered up to 0.4 m thick peat deposit. Uncertain whether there are boulders or solid rock underneath. No outcrops.
8 290084 6867210 Towards T15: marshland at crossroad with up to 0.5 m thick peat deposit. Exposed rock nearby. It is uncertain whether there is solid rock or blockfield underneath the up to 0.2 m thick organic layer on top. Easy access for drill rig.
9 290111 6866661 Near T12: some larger boulders. Easy access for drill rig. Thin vegetation cover over blockfield or solid rock. There is a stream 200 m northeast of the point.
10 290321 6866789 Sloping terrain, some boulders and some exposed rock west of the buildings. Up to 0.5 m thick peat deposit by the buildings. The area is unsuited for drill rig.
11 290577 6866872 T11: Standing water (15 m from marker). There are some boulders between the location of the designed road and the turbine point. Large resistance when penetrating the rod (max. 0.2 m into the ground). There is marshland 70 m ENE of T11 and 0.2 m with high resistance soil over solid rock/boulders. The marshland stops 70 m west of the
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crossroad (to T10). The peat deposit is 1.0-1.2 m thick. At the borderline of the deposit, the terrain is sloping and the peat deposit is registered to 0.1 m thick. There are some visible boulders near the crossroad.
12 291012 6866868 Towards T10: some marshland in sloping terrain. The peat deposit is at least 0.5 m thick. Stop due to too high resistance. Some visible boulders
13 291109 6867058 Towards T10 crossroad: At least 1 m thick deposit of peat with high sand content. The rod stopped after 1 m. Further east: sloping, undulating terrain. Difficult access for drill rig. No boulders or exposed rock. 0.3 m thick peat deposit towards the crossroad in the east. The terrain flattens out at the crossroad (to T8). Some outcrops. Stream observed.
14 291335 6866988 Towards T9: sloping terrain with peat deposit with registered thickness of up to 0.7 m, but generally 0.2-0.4 m thick. Moist marshland.
15 291420 6867218 0.5 m thick peat deposit, but a lot of exposed boulders, which means that the rod may stop in boulders instead of solid rock
16 291420 6867219 Exposed rock, some boulders and 0.0-0.2 m thick peat deposit. Stream observed.
17 291532 6867338 A lot of exposed rock. Locally up to 0.8 m thick peat deposit.
18 291456 6867419 Exposed rock. Some exposed rock visible in the road, but it is also up to 1 m thick layer of organic material along the road. Easy access with drill rig.
19 291383 6867453 Marshland towards the first river. 1.1 m thick peat deposit 20 m east of the river.
20 291270 6867507 A lot of boulders by the river, but there are no rock exposures. Up to 0.6 m thick peat deposit between the two rivers.
21 291220 6867567 0.5 m thick peat deposit, but there is only a thin vegetation cover over rock in the direction of T08.
22 291569 6867443 Sloping terrain with some exposed terrain and some boulders. The peat thickness is 0.5 m, but is mostly 0.1-0.3 m thick.
23 291598 6867519 Exposed rock. Sporadic, thin vegetation cover
24 291768 6867496 A lot of boulders hidden by the vegetation cover in the depression - after T07 (towards T06). Mostly exposed rock towards T06, but up to 0.5 m thick peat deposit on a small flat and at the site of T06
25 291673 6867292 Marshland with up to 1.0 m thick peat deposit.
26 291909 6867276 Sloping terrain. Some boulders and a few exposures. 0.0-0.3 m deep to rock/boulder. There is a 10 m wide blockfield that is mostly covered by the vegetation.
27 292255 6867411 Outcropping rock
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28 292289 6867306 Sloping terrain with some outcrops. Further down, there is marshland with 0.3-0.8 m thick peat deposit. Alternating between rock exposures and 0.1-0.4 m thick peat deposits east of "Blandevannet".
29 292330 6866898 Mostly outcropping rock with smaller, local areas with generally 0.1-0.4 m thick peat deposits. 0.9 m thick in a few registrations.
30 292218 6866622 T04: Outcropping rock with some vegetation
31 292416 6866489 Outcropping rock with some sloping terrain. Locally peat deposit with thickness 0.5 m.
32 292601 6866465 T03: Some exposed rock and standing water on the small peat deposit that is 0.3 m thick.
33 292666 6866306 Some exposed rock and standing water on the small peat deposit that is 0.3 m thick. Sloping terrain
34 292535 6866139 T02: Outcropping rock with some vegetation cover
35 292541 6865933 Outcropping rock with, some vegetation cover and locally 1.0 m thick peat deposit.
36 292559 6865638 T01: Outcropping rock
37 292900 6866762 Between the road at Oldeide and plateau: marshland by the road with peat deposit thickness of 0.3-1.0 m, but locally more than 2 m thick. A few exposed boulders. Sloping terrain after 300 m. Difficult for drill rig to cross river in depression. Increasing amount of outcrops uphill with local peat deposit with registered thickness of up to 1.0 m.
10211972-RIG-RAP-001 September 12, 2019 / 00 Page 10 of 10 ±
T8
T7 T6 T5
T18 T15
T17 T16 T11 T9 T10
T12 T4
T13 T3
T14 T2
T1 Legend
Turbines
Road
Fag Format RIG A3 BREMANGERLANDET VINDPARK AS Dato BREMANGERLANDET VINDKRAFTVERK 12.09.2019
Format/Målestokk:
INFRASTRUCTURE 1:18297 Tegningsnr. RIGberg-TEG-001 Status Tegnet Kontrollert Godkjent CHRIT HST AJ Oppdragsnr. Rev. Kartverket, Geovekst og kommuner - Geodata AS www.multiconsult.no 10211972 00 ±
Sloping terrain with rock exposures. Peat deposit with registered thickness up to 0.5 m Exposed rock Undulating terrain: boulders in the Sloping terrain depressions and outcrops on the highs Exposed rock and with many rock registered peat deposit exposures and up to 1.1 m thick peat deposit with Blockfield or solid rock Marshland. Registered registered thickness Blockfield underneath 0.4 m thick up to 0.8 m peat deposit 0.5 m thick peat deposit Rock exposure with local Blockfield peat deposit with registered Blockfield or solid rock Marshland. 0.3-1.0 m thickness up to 0.9 m underneath vegetation thick peat deposit Vegetation covered cover boulders Rock exposure Marshland. Registered up to 1.0 m thick peat deposit
Blockfield Rock exposure
Rock exposure
Legend
Turbines
Road
Fag Format RIG A3 BREMANGERLANDET VINDPARK AS Dato BREMANGERLANDET VINDKRAFTVERK 15.09.2019
Format/Målestokk: DEPOSITS 1:18297 Tegningsnr. RIGberg-TEG-002 Status Tegnet Kontrollert Godkjent CHRIT HST AJ Oppdragsnr. Rev. Kartverket, Geovekst og kommuner - Geodata AS www.multiconsult.no 10211972 00