DET NORSKE VERITAS TM

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ET

N

ORSKE

V

ERITAS

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./DNV

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.: 2013-02302013-0230

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14MSJXA-22

R

01, 2013-03-21

English Summary Report

ENVIRONMENTAL MONITORING

AND BASELINE SURVEYS IN

REGION II 2012

S

TATOIL

P

ETROLEUM AS

Talisman Energy Norge AS

ExxonMobil Exploration & Production Norway AS

Marathon Oil Norge AS

Det norske oljeselskap

Lundin Norway AS

DNV Reg. No.: 14MSJXA-22

Table of Contents

Page

PERSONNEL ... III 

1  INTRODUCTION ... 1 

2  FIELD WORK ... 2 

3  STATUS OF REGION II ... 3 

4  SUMMARY OF THE RESULTS FROM THE MONITORING IN REGION II ... 7 

1.1  Rev (former Varg Sør) ... 7 

1.2  Varg ... 8 

1.3  Sigyn ... 9 

1.4  Sleipner Vest ... 9 

1.5  Sleipner Øst ... 10 

1.6  Sleipner Alfa Nord ... 11 

1.7  Glitne ... 12  1.8  Grane ... 12  1.9  Balder ... 13  1.10  Ringhorne ... 14  1.11  Jotun ... 15  1.12  Vale ... 16  1.13  Skirne ... 16  1.14  Byggve ... 17  1.15  Heimdal ... 18  1.16  Volve ... 19  1.17  Vilje ... 20  1.18  Alvheim ... 21 

Preface

The environmental survey in Region II 2012 was conducted by Det Norske Veritas in collaboration with MOLAB, and was a part of a major survey coordinated by Statoil’s Endre Aas and Rolf C. Sundt.

The report summarizes the results from the chemical and physical analyses of the seabed sediments as well as analyses of the benthic macro fauna community in Region II.

Personnel

Fieldwork: Thomas Møskeland (DNV, survey leader) Christian Volan (DNV, shift leader) Tormod Glette (DNV, shift leader) Jon Kristian Haugland (DNV) Rozemarijn Keuning (DNV)

Gunn Mari Michaelsen (MOLAB) Yngve Ildgruben (MOLAB)

Rolf C. Sundt was the Statoil representative during the survey

Analyses:

Grain size distribution: Terje Kolberg, Eli Ellingsen

Total organic material: Terje Kolberg, Eli Ellingsen

Metals: Terje Pedersen, Gunn-Mari Michaelsen, Maja Lisa Olsen, Pål Torgersen, Hanna Skog Lillevik

THC: Helene Tvete, Anita Wolff Kalstad, Harald Borud

NPD and PAH: Helene Tvete

The chemical analyses were performed at Molab AS, Oslo, Mo i Rana and Porsgrunn. The grain size distribution was determined at Molab AS, avdeling Glomfjord.

Biological analyses: Thomas Møskeland og Jon Kristian Haugland (krepsdyr) Amund Ulfsnes (pigghuder, bløtdyr)

Per-Bie Wikander, Molltax (bløtdyr)

Fredrik Melsom, David Barnes, Øystein Stokland (børstemark, varia) Rozemarijn Keuning (varia)

Sorting was conducted at DNV’s Biology Laboratory at Høvik. Ludvig Søgnen Jensen and Kasper Nøland were responsible of sorting biological samples.

DNV Reg. No.: 14MSJXA-22

Univariate analyses: Lucy Brooks, Thomas Møskeland, Christian Volan Multivariate analyses: Sam-Arne Nøland, Øyvind Fjukmoen, Fredrik Melsom

Preparation of report:

Chemistry: Wenche Brennbakk, Helene Tvete, Hege Karlsen

Biology: Lucy Brooks, Christian Volan, Fredrik Melsom, Øyvind Fjukmoen, Sam-Arne Nøland

Main report: Sam-Arne Nøland

Verification: Øyvind Fjukmoen

1

INTRODUCTION

The report presents the results from the regional sediment monitoring in Region II – the Sleipner area in 2012. The purpose of the regional survey is to study the environmental impacts from petroleum activities at each field and over a larger area. Regional sediment monitoring in the Sleipner area was first implemented in 1997. A total of 18 fields, from Rev in the south to Vale in the north, were surveyed. In addition the survey included 6 baseline surveys and 3 new regional stations. The location of the various fields is shown in the map below.

Overview of fields included in the monitoring of Region II 2012 and baseline surveys in the region

DNV Reg. No.: 14MSJXA-22

Fields Operator Type

Planned no. of stations

Actual no. of stations

Sleipner Vest Statoil Follow-up 6 6

Sleipner Øst Statoil Follow-up 12 10

Sleipner Alfa nord Statoil Follow-up 4 4

Glitne Statoil Follow-up 5 6

Grane Statoil Follow-up 15 15

Heimdal Statoil Follow-up 4 5

Vale Statoil Follow-up 4 4

Volve Statoil Follow-up 6 6

Vilje Marathon Follow-up 7 7

Skirne Statoil(Total) Follow-up 5 5

Byggve Balder Ringhorne Jotun Sigyn Rev Varg Alvheim Regional stations Statoil(Total) ExxonMobil ExxonMobil ExxonMobil ExxonMobil Talisman Talisman Marathon Follow-up Follow-up Follow-up Follow-up Follow-up Follow-up Follow-up Follow-up 5 4 9 4 5 6 6 4 15 5 4 9 4 5 6 6 4 15

Dagny Statoil Baseline 13 13

Eirin Luno/Edvard Grieg Ivar Aasen/Draupne PdQ Draupne/Hanz Isbjørn Statoil Lundin Det norske Det norske Talisman Baseline Baseline Baseline Baseline Baseline 13 13 15 13 13 13 13 15 13 13

Regional stations Baseline 3 3

Sum

The reporting is divided into three parts. In the Sammendragsrapport (Rapp.nr. 2013-0229) and the Summary Report (this) the main results are presented. The Hovedrapport (main report, Rapp.nr. 2012-1649) contains all the results and review of these.

Brief description of the region

Region II is located between 58° and 60° N in the Norwegian sector of the North Sea. The water depth of the 2012 stations ranges from 78m to 130m. The major current direction in the region varies; in the Frigg area towards southeast, in the Balder area towards east/southeast and in the Varg area towards north/northeast. This is the sixth regional survey in Region II.

2

FIELD WORK

The fieldwork was conducted by DNV in collaboration with Molab from the fishing/research vessel ”Christina E”. The survey, which also included baseline surveys in Region I and IV, was carried out in the period 21. of May to 3. of June 2012. The sampling in Region II took place 24. May – 1. June. The survey included sampling of sediments for physical, chemical and biological analyses. Sampling and analyses were conducted according to Guidelines for Environmental Monitoring (TA 2848) and internal DNV and MOLAB accredited procedures for such work (Test 083 and 032). A separate survey report has prepared. Station coordinates are given in Appendix 1.

Total number of stations and analyses included in the sampling- and analyses program in Region II 2012.

Field Stations Bio Grain/ TOM

THC Metals NPD/ PAH Existing fields in Region II

Sleipner Vest 6 0 0 18 18 18

Sleipner Øst 10 40 8 30 30 15

Sleipner Alfa Nord 4 0 0 12 12 6

Glitne 6 0 0 18 18 6 Grane 15 75 15 45 45 45 Heimdal 5 0 0 12 12 6 Vale 4 0 0 12 12 0 Volve 6 20 4 12 15 12 Vilje 7 20 4 21 21 9 Skirne 5 0 0 15 15 15 Byggve 5 0 0 15 15 15 Balder 4 0 0 12 12 6 Ringhorne 9 20 4 27 27 9 Jotun 4 0 0 12 12 3 Sigyn 5 0 0 15 15 6 Rev 6 20 4 18 15 18 Varg 6 10 2 18 18 6 Alvheim 4 20 4 12 12 3 Regional stations _{15 75 15 45 45 45} Sum Region II _{126 300 60 369 369 243} Baseline

Luno/ Edvard Grieg 13 65 13 39 39 6

Ivar Aasen 15 75 15 45 45 6

Hanz 13 65 13 39 39 6

Dagny 13 65 13 39 39 6

Eirin 13 65 13 39 39 6

Isbjørn 13 65 13 39 39 6

New regional stations (for baseline) _{3 15 3 18 18 15}

Sum Baseline in Region II _{83 415 83 258 258 51} Totalt 2012 _{209 715 143 627 627 294}

3

STATUS OF REGION II

18 existing fields in Region II were analysed for hydrocarbons (THC), NPD, PAH and metals. At 8 of the fields the state of the benthic macro fauna was assessed. The sediments at these fields were

characterized by grain size distribution and total organic matter (TOM). In addition baseline surveys were conducted at 6 localities in Region II.

DNV Reg. No.: 14MSJXA-22

The 2012 survey in Region II shows:

 In broad outline the level of THC is lower or at the same level as in 2009. The level of barium has increased since 2009.

 The sediments at Region II are dominated by sand and fine sand in all three subregions.

 The contents of total organic material in the sediments varies from 0.73 – 0.94 % in the northern subregion, 0.54 – 1.01 % in the shallow subregion and 1.30 – 2.24 in the central subregion.

 The level of THC in the shallow subregion is between 1 and 10 mg/kg. In the central subregion the THC-content is between 3 and 26 mg/kg (except from Ringhorne ekstra with 25 147

mg/kg). In the northern subregion the THC concentrations is between 4 and 6 mg/kg. Six of the fields show THC > LSC (Volve, Sleipner Vest, Sleipner Alfa Nord, Glitne, Balder and

Ringhorne).The highest THC-value is found at Ringhorne ekstra with 25 147 mg/kg.

 The Ba-content in the shallow subregion varies from 26 -936 mg/kg. The Ba-content in the central subregion varies from 105 – 5470 mg/kg, while the northern subregion consists of 163 – 507 mg/kg Ba. The highest amount is found at Grane og Ringhorne. Elevated concentrations (>LSC) of barium were found at all fields. The highest Ba-content is measured on RIN-ekstra (5 470 mg/kg), RIN4 (5 192 mg/kg), RIN-5 (4 505 mg/kg) and GRA-15 (3 643 mg/kg).

 There is an increase in the Ba-concentrations at most of the fields in the region. The THC-levels are generally unchanged on all the fields.

 It is increased PAH and/or NPD levels on 11 out of 18 fields. The majority are relatively low concentrations on the same level as LSC. On Grane all the stations were analyzed for PAH and NPD, and elevated levels were found at 12 out of 15 stations. The highest concentrations were measured at Ringhorne ekstra (3.0 mg/kg PAH and 14.3 mg/kg NPD).

 There are no major changes in the composition of heavy metals (Cd, Cr, Cu, Hg, Pb, Zn) compared to previous surveys. There is a slight increase of Cr and/or Pb on a few of the stations.

 The state of the benthic macro fauna was assessed at Rev, Varg, Sleipner Øst and Volve in the shallow subregionen and Grane, Ringhorne, Vilje and Alvheim in the central subregion. The results showed no disturbance of the fauna at any of the fields.

 Estimated area contaminated with THC is between 1.7 and 5.8 km2 in Region II. In 2009 the area was estimated to 1 km2, but the estimates numbers from the two surveys are not

comparable.

 Estimated minimum area contaminated with barium is in the region of 15 -20 km2 in Region II. In 2009 the corresponding number was 12.8 km2. The area for Barium is most likely

considerably larger than the estimated minimum area.

Limits of Significant contamination (LSC) in the northern, shallow and central subregion are shown in the table below. There are small variations compared to previous surveys in the shallow and central subregions. In 2009 LSC for Ba in the shallow subregion was lower than the previous survey and in 2012. The 2012 LSC for Barium is at the same level as 2003 and 2006 in the shallow subregion.

There is an increase in the LSC values in the northern subregion compared to 2009; few regional stations in the northern subregion results in few degrees of freedom and high t-value and thus high LSC for most of the components.

Region II, LSC values for 2012, 2009, 2006 and 2003 in the northern, shallow and central subregions. 2012-values in bold.

mg/kg THC PAH NPD Ba Cd Cr Cu Hg Pb Ti Zn LSC northern 1997-2012 13.2 0.025 0.01 29 0.02 12.6 1.2 0.01 10.3 417 7.92 LSC northern1997-2009 4 0.03 0.06 28 0.02 6.9 1.2 0.01 5.7 11.3 LSC northern1997-2006 11.3 59 <0.03 6.3 1.2 0.01 4.4 7.2 LSC northern1997-2003 13.3 76 0.03 5.9 1.4 0.01 3.8 7.4 LSC shallow 1997-2012 5.9 0.033 0.02 31 0.01 10.6 0.7 0.01 6.7 174 9.53 LSC shallow1997-2009 6.9 0.02 0.02 16 0.02 9.8 1 0.01 6.3 10.4 LSC shallow1997-2006 7.9 28 <0.03 9.8 1 0.01 6.7 8.8 LSC shallow1997-2003 9.1 32 0.03 10 1 0.01 6.9 9.1 LSC central 1997-2012 9.2 0.083 0.03 127 0.02 8.7 2.2 0.01 5.5 157 11.5 LSC central 1996-2009 13,4 0.07 0.02 154 0.04 9.5 2.6 0.02 6.6 13.8 LSC central 1997-2006 13.7 152 0.04 6.3 1.2 0.01 4.4 7.2 LSC central 1997-2003 14.5 161 0.03 9.4 2.2 0.01 6.8 12.4

The table summarises the most important results from the survey. The most important results from each field are summarised in chapter 4. The baseline surveys are summarised in chapter 5.

Grain size and total organic matter (TOM)

The region is divided into three subregions (north, shallow and central). The sediments are dominated by fine/very fine sand in all subregions. TOM is in the 0.73 -0.94 % range in northern subregion, 0.54 -1.01 % in the shallow subregion and 1.30 – 2.24 % in the central subregion.

How to read the box plots

Total hydrocarbons (THC) Cont.

Interval with minimum-and maximum value (exclusive outliers and extrema)

50% - interval

i.e. 50 % of all stations have medians in this interval

median outliers

DNV Reg. No.: 14MSJXA-22

The level of THC in the shallow subregion is between 1 and 10 mg/kg. In the central subregion the THC-content is between 3 and 26 mg/kg (except from Ringhorne ekstra with 25 147 mg/kg). In the northern subregion the THC content is between 4 and 6 mg/kg. Six of the fields show THC > LSC (Volve, Sleipner Vest, Sleipner Alfa Nord, Glitne, Balder and Ringhorne). The highest THC-value is found at Ringhorne ekstra with 25 147 mg/kg. Please note the x-axis jumps from 30 to 25 100 mg/kg.

Baryte– barium (Ba)

The Ba-content in the shallow subregion varies from 26 -936 mg/kg. The Ba-content in the central subregion varies from 105 – 5470 mg/kg, while the

northern subregion contains 163 – 507 mg/kg Ba. The highest amount is measured at Grane and Ringhorne. Elevated concentrations of barium were found at all fields. The highest Ba-content is measured on RIN-ekstra (5 470 mg/kg), RIN4 (5 192 mg/kg), RIN-5 (4 505 mg/kg) and GRA-15 (3 643 mg/kg).

Bunnfauna

The fauna in Region II is divided into the same subregions as in previous years, and is in accordance with the subregions identified from the other investigated parameters. In general it is considerable variations in abundance and partly number of species between years with accompanying variations in the diversity indices. Similar variations are observed at the regional stations and reflect the natural variation. Of the eight fields were the macro fauna was assessed, no disturbed fauna was revealed.

4

SUMMARY OF THE RESULTS FROM THE MONITORING IN REGION II

1.1

Rev (former Varg Sør)

The sediments at Rev consist of fine sand, and the organic content is low (<1 %).

The level of THC is reduced at all stations since 2006 and 2009, and there are no values higher than LSC. Varg S-10 is the only station where PAH higher than LSC has been found. There is an increase in Ba at all stations, highest at VargS19 (500m S) and VargS3 (500m W). With one exception all Ba-concentrations are higher than LSC. No discharges of barium have been reported since previous survey.

There are no other metals higher than LSC. A weak tendency to increased levels of all metals is indicated. The diversity indices of the benthic fauna are somewhat lower than in 2009, but higher than in 2006. The Rev field

is located in the southern shallow subregion, and the results from the regional stations shows large natural temporal variations in this area. There are no indications of disturbance in the benthic community at Rev. The abiotic factors vary marginally within the stations, and the fauna is quite uniform at the four field stations. The fauna in 2012 is more similar to the 2006 than 2009 fauna.

Figur 1.1-2 THC and Ba at Rev.

Rev VargS3 VargS7 VargS8 VargS10 VargS19 436000 436200 436400 436600 436800 437000 6432000 6432200 6432400 6432600 6432800 6433000 6433200 6433400

Figur 1.1-1Rev 2012. The figure shows level of Barium and

DNV Reg. No.: 14MSJXA-22

1.2

Varg

The sediments at Varg consist of fine sand, and the organic content is low (<1 %).

No THC,PAH or NPD-values hihger than LSC have been found and the level of THC is lower than in previous surveys.

There is an increase in Ba at all stations highest on VAR11 (250m S). No discharges of barium have been reported since previous survey in 2009.

With one exception all

Ba-concentrations are higher than LSC Most of the stations have somewhat elevated concentrations of Cu and Pb.

The diversity indices of the benthic fauna are somewhat lower than in 2009, but higher than in 2006. As is the case for Rev, Varg is located in the southern shallow subregion,

and the results from the regional stations shows large natural temporal variations in this area. There are no indications of disturbance in the benthic community at Varg.

Figur 1.2-2 THC and Ba at Varg

Figur 1.2-1 Varg 2012. The figure shows level of Barium and part of

1.3

Sigyn

Elevated concentrations of THC, PAH or NPD are not found, and all stations have values lower than R2-16. The THC concentrations have decreased since 2009.

4 out of 5 stations have elevated Ba-values, the concentrations are at the same level as in 2009. The other metals are at the same level or lower than LSC.

Biological analyses and sediment characteristics were not included at Sigyn

Figur 1.3-1 THC and Ba på Sigyn Figur 1.3-2Sigyn 2012. The figure shows level of

Barium and part of LSC-limit for barium. THC > LSC was not found.

1.4

Sleipner Vest

Elevated concentrations of THC were found at two stations (SLV01 and -02) out to 500m N. SLV01 (250m) has elevated concentrations of THC, PAH and NPD, and all metals except for Cd and Ti. Compared to earlier surveys the THC-levels are relatively unchanged except for an increase at SLV01. There is an increase in Ba at all stations, highest towards north (SLV01 and -02). The concentrations of Barium, Cr and Zn are higher than LSC at all stations. There are large temporal variations of Ba. The 2012 results are higher than in 2009, but lower than in 2000.

DNV Reg. No.: 14MSJXA-22

1.5

Sleipner Øst

The 2012 Sleipner Øst program included only Sleipner A and Loke. The sediments at Sleipner A consist of fine sand, and the organic content is low (<1 %). Elevated concentrations of THC, PAH or NPD are not found, and all stations have values on the same level as the regional station R2-17. There are no major changes in the THC-levels compared to earlier surveys. There is an increase in Ba at all stations, highest at LOK-04 (250m N of Loke) and SLA33 (250m S of Sleipner A). No discharges of barium have been reported since previous survey at

Figur 1.4-1 THC and Ba at Sleipner Vest Figur 1.4-2Sleipner Vest 2012. The figure shows

level of Barium and LSC-limit for THC. The LSC limit of Ba is outside the image.

Figur 1.5-1Sleipner Øst 2012. The figure shows level of Barium. The

Sleipner Øst/A. The concentrations of Barium are elevated at all stations, and they are also higher than the regional station R2-17. The other metals are at the same level or lower than LSC.

Diversity indices of the benthic fauna at Sleipner Øst are somewhat lower than in 2009. As is the case for Rev and Varg, Sleipner Øst is located in the southern shallow subregion, and the results from the regional stations shows large natural temporal variations in this area. The species composition and fauna similarity with the regional stations shows an undisturbed benthic fauna. Like Rev the fauna has more in common with the fauna in 2006 than in 2009.

Figur 1.5-2 THC and Ba Sleipner Øst.

1.6

Sleipner Alfa Nord

Elevated THC have been found at three statipns. All field stations have THC at the same level or higher than the regional station R2-18. Compared to earlier years the THC level is relatively unchanged.

There is an increase in Ba at all stations, highest at ALF-1 (250m N). All stations containsbarium higher than LSC and the regional station R2-18. The levels of Cr, Cu and Zn are also slightly elevated at most stations.

Biological analyses and sediment characteristics were not included at

Figur 1.6-2 THC and Ba at Sleipner Alfa Nord

Figur 1.6-1 Sleipner Alfa Nord 2012. The figure shows

level of Barium and part of the LSC-limit for THC. The LSC limit of Ba is outside the image.

DNV Reg. No.: 14MSJXA-22

1.7

Glitne

There are somewhat elevated

concentrations of THC and NPD at GLI-01 (300m NE), the rest of the stationse have THC, PAH og NPD values lower than LSC. All stationes have higher content of THC than the regional station R2-8. The level of THC has increased at two stations, but the concentrations are at the same level as in 2006.

There is a small increase of Ba-content compared to previous surveys, with the largest increase on GLI-01. Barium is elevated at all stations and is higher than R2-8. Elevated levels of Cr, Pb and Zn are found at many of the stations.

Biological analyses and sediment

characteristics were not included at Glitne.

Figur 1.7-2 THC and Ba at Glitne

1.8

Grane

The sediments at Grane consist of fine sand, and the organic content varies from 1.30 to 2.10 %. There are no elevated concentrations of THC at Grane, and the concentrations are at the same level as the regional station R2-20. The levels are in general unchanged since 2006. Elevated values of PAH and NPD are found at most stations.

There is a considerable increase in Ba at all stations, which is can be explained by reported discharges of barite. The Ba-concentrations are higher than LSC at all stations. Largest increase is found closest to the platform, and it cannot be ruled out the leakage of injected drill cuttings may have contributed to the increased Ba level. A smaller increase of the other metals is also observed.

THC: 0,1 km2 Ba: >1,2 km2 Glitne GLI1 GLI2 GLI5 GLI10 GLI14 GLI14alt1 422100 422300 422500 422700 422900 423100 6508500 6508700 6508900 6509100 6509300 6509500 160 200 300 400 500 600 700 760 0 50 100 150

Figur 1.7-1 Glitne 2012. The figure shows level of Barium

and LSC-limit for THC. The LSC limit of Ba is outside the image.

The abundance in the benthic fauna is higher than ever reported at Grane, which results in lower diversity indices than earlier at all stations. The lowest indices were found at two of the stations located closest to the center where a considerable increase in Ba has been observed. The two stations differ from the others because of high abundance of the polychaeta P. jeffreysii, a most

common species at several of the fields in the region inclusive the regional stations. A connection between this species and high Barium concentrations has not been revealed, and the fauna at Grane is regarded as

undisturbed.

Figur 1.8-2 THC and Ba at Grane.

1.9

Balder

Elevated concentrations of THC, PAH and NPD have been found at two stations, and the levels are in general unchanged compared to previous surveys. There are indications of contamination by olefins (AncoTecB) at BAL-42.

The concentrations of Barium are elevated at all stations, and at BAL-37 (250m SE of Balder B) and BAL-42 (250m S of Balder A) the concentrations are considerably elevated compared to 2009 and 2006. Elevated values of Cr, Cu og Zn are found at most stations.

Biological analyses and sediment characteristics were not included at Balder.

There were only two stations located at each of the templates (A and B) at Balder, and no contour plot has been made.

Figur 1.8-1 Grane 2012. The figure shows level of Barium

and part of LSC-limit for barium. THC > LSC was not found.

DNV Reg. No.: 14MSJXA-22

Figur 1.9-1 THC and Ba at Balder

1.10

Ringhorne

The sediments at Ringhorne consist of fine sand, and the organic content varies from 1.77 to 2.24 %.

Elevated concentrations of THC are found at two stations; RIN4 (250m NE) is at the same level as LSC, whilst RIN-Ekstra (420m W) is considerably contaminated by THC, PAH and NPD. The THC-concentrations are at the same level as in previous surveys at all stations except for RIN-Ekstra where the values have increased with 18 000 mg/kg since 2009. There are elevated values and a considerable increase of Ba

at all stations, which is in accordance with reported discharges in the period from the previous survey. RIN-Ekstra contains elevated concentrations of all metals, and an increase of Cr and Pb is seen at all stations.

The diversity indices of the benthic fauna at Ringhorne are lower than in 2009, but at the same level or higher than 2006. The benthic community at the four stations is uniform and differs from the regional stations because of small variations in the sediment grain size distribution. The analyses indicate a correlation between slightly higher values of Pb at the field stations and differences in the benthic community between field stations and regional stations. However, the variations are small, and the fauna is regarded as undisturbed. It should, however, be included in future monitoring.

Figur 1.10-1 Ringhorne 2012. The figure shows level of Barium and

Figur 1.10-2THC and Ba at Ringhorne.

1.11

Jotun

Elevated THC is not found at Jotun, and the concentrations are at the same level as the regional station R2-21. The concentrations are unaltered compared to the three last surveys.

The concentrations of Ba, Cr, Cu and Zn are elevated at all stations. There is a small increase of Ba at all stations compared to the three last

surveys.

The concentrations of the other metals are more or less unchanged.

Biological analyses and sediment characteristics were not included at Jotun.

Figur 1.11-2 THC and Ba at Jotun.

Figur 1.11-1 Jotun 2012. The figure shows level of

Barium. The LSC limit of Ba is outside the image. THC > LSC was not found.

DNV Reg. No.: 14MSJXA-22

1.12

Vale

Elevated concentrations of THC are not found, and the concentrations are unchanged compared to previous surveys.

The concentrations of Barium are elevated at all stations, and the

concentrations have increased at 3 of the 4 stations since 2009, most at VA-07 (250m SW).

Biological analyses and sediment

characteristics were not included at Vale.

Figur 1.12-2 THC and Ba at Vale

1.13

Skirne

Elevated concentrations of THC are not found, and the concentrations are unchanged compared to previous surveys.

There are relatively high values of Ba at all stations. The concentrations are at the same level as in 2009, when an increase was observed.

Biological analyses and sediment characteristics were not included at Skirne.

Figur 1.12-1 Vale 2012. The figure shows level of Barium. The

LSC limit of Ba is outside the image. THC > LSC was not found.

1.14

Byggve

There is an increase of THC compared to earlier years, but no elevated concentrations of THC are found All stations contain PAH higher than LSC.

Barium levels, but no other metals, are elevated at all stations. A considerable increase is observed at BY1 (250m N), but the other stations are unchanged compared to previous surveys.

Biological analyses and sediment characteristics were not included at Byggve.

Figur 1.13-1 THCand Ba at Skirne. Figur 1.13-2 Skirne 2012. The figure shows level of

Barium. The LSC limit of Ba is outside the image. THC > LSC was not found.

DNV Reg. No.: 14MSJXA-22

1.15

Heimdal

Elevated concentrations of THC are not found. Elevated values of av PAH and NPD are found at two stations (out to 500m S).

The concentrations of Barium are elevated at all stations, Cu, Pb and Zn at most of the stations. The level of Ba has increased since 2003, at the most at HEIM-18 (300m S).

Biological analyses and sediment characteristics were not included at Heimdal.

Figur 1.14-1 THC and Ba at Byggve Figur 1.14-2 Byggve 2012. The figure shows level of

Barium and part of LSC-limit for barium. THC > LSC was not found.

Figur 1.15-1 Heimdal 2012. The figure shows level

of Barium and part of LSC-limit for barium. THC > LSC was not found.

Figur 1.15-2 THC and Ba at Heimdal

1.16

Volve

The sediments at Volve consist of fine sand, and the organic content is low (<1 %).

Elevated THC-values are found at station VOV1 (250m N). The THC-concentrations are reduced at all stations since 2009.

The concentrations of Ba and Cu are

elevated at all stations. At the stations which had highest Ba-concentrations in 2009, the values have decreased. At the other stations an increase is observed.

Volve is located in the southern shallow subregion, and the results from the regional stations shows large natural temporal variations in this area. The temporal pattern with increased abundance and reduced diversity indices that can be seen at Volve corresponds to what can be observed at the regional stations, and is regarded as natural variations.

The benthic fauna at the four stations is uniform and undisturbed, and differs slightly from the 2009 fauna. The analyses indicate a possible correlation with higher THC in 2009.

Figur 1.16-1 Volve 2012. The figure shows level of Barium

and LSC-limit for THC. The LSC limit of Ba is outside the image.

DNV Reg. No.: 14MSJXA-22

Figur 1.16-2 THC and Ba at Volve

1.17

Vilje

Figur 4-3 THC and Ba at Vilje

The sediments at Vilje consist of fine sand, and the organic content varies from 1.44 to 1.95 %.

Elevated concentrations of THC are not found, and the concentrations of THC have increased at all stations but one.

The concentrations of Barium are elevated at all stations but one. The Ba levels have increased at all stations. The largest increase is seen at VIL8 (250m NW).

The benthic fauna at the four stations is regarded as undisturbed. Abundance and number of species have decreased since 2009, resulting in slightly reduced diversity indices. The results show a somewhat different development at Vilje than the nearby regional stations, and the field should be included in future monitoring.

Figur 1.17-4 Vilje 2012. The figure shows level of Barium and part of

1.18

Alvheim

The sediments at Alvheim consist of fine sand, and the organic content varies from 1.47 to 1.78 %.

Elevated concentrations of THC are not found, and the concentrations are unchanged compared to previous surveys.

The concentrations of Barium are elevated at all stations. Except for a large increase at KNA12 (250m NW) the Ba-levels are unaltered compared to previous surveys.

There are no indications that the benthic fauna at Alvheim is disturbed despite a reduction in number of species and diversity indices since 2009. The fauna differs somewhat from the regional stations R2-10 and -21, but his cannot be related to field activities.

Figur 4-2 THC and Ba at Alvheim.

Figur 1.18-1 Alvheim 2012. The figure shows level of Barium.

The LSC limit of Ba is outside the image. THC > LSC was not found.

DNV Reg. No.: 14MSJXA-22

5

BASELINE SURVEYS IN REGION II

The 2012 survey from the baseline studies in region II shows:

 The sediments consist of sand and very fine sand.

 The Total Organic Matter varies from 0,77 – 2,45 %

 The THC-levels varies from <1 – 10 mg/kg, and there are no significant elevated values compared to LSC.

 The Ba-levels varies from 29 – 274 mg/kg. Most of the stations at Dagny and Eirin have elevated levels of Ba compared to LSC.

 The benthic fauna in the investigated areas is undisturbed.

The most important parameters and variations for each field:

Ivar Aasen Variation Description of the field

THC (mg/kg) 2 – 4 (Draupne) 2 – 5 (Hanz)

No elevated THC-levels are found at Ivar Asen compared to LSC. The concentrations are on the same level as the regional station. Ba (mg/kg) 34 – 53 (Draupne)

13-53 (Hanz)

No elevated Ba-levels are found at Ivar Asen compared to LSC. The concentrations are on the same level as the regional station. Diversitet H’ Diversitet ES100 Diversitet H’ Diversitet ES100 3.6 – 4.1 (Ivar Aasen) 24 – 29 (Ivar Aasen) 3.9 – 4.6 (Hanz) 25 – 32 (Hanz)

The fauna at both localities is undisturbed and characterised by high abundances of some species, which gives moderate diversity indices. This was also the case in 1996. Of the three new regional stations R2-14 and -13 are best suited. Both localities belong to the central subregion in Region II.

Edvard Grieg Variation Description of the field

THC (mg/kg) <1 – 3 No elevated THC-levels are found at Ivar Asen compared to LSC. The concentrations are on the same level as the regional station. Ba (mg/kg) 29 – 62 No elevated Ba-levels are found at Ivar Asen compared to LSC. The concentrations are on the same level as the regional station. Diversitet H’

Diversitet ES100

4.0 – 4.3 27 - 31

The variations in the fauna are small, and the results show a healthy undisturbed benthic macro fauna. The fauna at the new regional station R2-14 does not differ from the fauna at Edvard Grieg. At the other two new regional stations the fauna is somewhat different, but this is not related to noteworthy differences in sediment

Dagny Variation Description of the field

THC (mg/kg) 5 – 10 The concentrations are on the same level as the regional station. No elevated THC-levels are found at Ivar Asen compared to LSC, two stations contain 1 mg/kg THC above LSC.

Ba (mg/kg) 124 – 274 The Ba-concentrations are on the same levels as the regional stations R2-18 and R2-19, but higher than R2-12. Minor elevations compared to LSC are found at 11 stations.

Diversitet H’ Diversitet ES100

3.9 – 4.9 30 - 39

The benthic fauna at Dagny is undisturbed and differs somewhat from the regional stations R2-8 and -18 because of greater water depth and higher content of silt and clay at the Dagny stations. The shallower regional station R2-12 differs from Dagny with regard to sediment characteristics and fauna. This station is not regarded as suited as a basis of comparison for Dagny.

Eirin Variation Description of the field

THC (mg/kg) 1 – 9 No elevated THC-levels are found at Eirin compared to LSC. The concentrations are on the same level as the regional stations. Ba (mg/kg) 108 – 182 The Ba- concentrations are on the same level as the regional

stations R2-18 and R2-19, but higher than R2-12. Minor elevations compared to LSC are found at 12 stations.

Diversitet H’ Diversitet ES100

4.1 – 4.9 33 - 39

The benthic fauna at Eirin is undisturbed and differs somewhat from the surrounding regional stations, which is related to the fact that Eirin is located in a deeper area and the sediments contain a larger fraction of silt and clay.

Isbjørn Variation Description of the field

THC (mg/kg) 2 – 6 No elevated THC-levels are found at Isbjørn compared to LSC. The concentrations are on the same level as the regional stations. Ba (mg/kg) 72 – 86 The Ba-concentrations are higher than the regional station, but there

are no elevated results compared to LSC. Diversitet H’

Diversitet ES100

3.3 – 3.9 24 - 28

The benthic fauna at Isbjørn is undisturbed. The relatively low diversity indices are similar to other fields and regional stations in the shallow subregion. The fauna differs somewhat from the regional station R2-6 because of differences in water depth and accompanying smaller differences in sediment characteristics.

Appendix 1

FR4 45 2 000 520605 6302341 BRY1 90 250 458 445 6 372 600 FR5 _{135 250} 519368 6300750 BRY2 90 500 458 695 6 372 600 FR6 135 500 519545 6300573 BRY3 90 1 000 459 195 6 372 600 FR7 135 1 000 519898 6300220 BRY4 90 2 000 460 195 6 372 600 FR8 _{225 250} 519014 6300750 BRY5 0 250 458 195 6 372 850 FR9 225 500 518837 6300573 BRY6 0 500 458 195 6 373 100 FR10 225 1 000 518484 6300220 BRY7 0 1 000 458 195 6 373 600 FR11 315 250 519014 6301104 BRY8 270 250 457 945 6 372 600 FR12 315 500 518837 6301281 BRY9 270 500 457 695 6 372 600 FR13 315 1 000 518484 6301634 BRY10 270 1 000 457 195 6 372 600 REG1-2 520295 6334146 BRY11 180 250 458 195 6 372 350 BRY12 180 500 458 195 6 372 100 BRY13 180 1 000 458 195 6 371 600 Isbjørn 448 770 6 429 227 Rev 436 471 6 432 469 IB1 20 250 448 856 6 429 462 VargS3 290 500 436 005 6 432 644 IB2 20 500 448 941 6 429 697 VargS7 20 500 436 646 6 432 942 IB3 20 1 000 449 112 6 430 167 VargS8 20 1 000 436 817 6 433 412 IB4 20 2 000 449 454 6 431 106 VargS10 110 500 436 944 6 432 301 IB5 110 250 449 005 6 429 141 VargS19 180 532 436 460 6 431 935 IB6 110 500 449 240 6 429 056 VargS20 20 2 000 437 159 6 434 352 IB7 110 1 000 449 710 6 428 885 IB8 200 250 448 684 6 428 992 _Varg 434 543 6 438 076

IB9 200 500 448 599 6 428 757 _{Ship (FPU)} 435 733 6 438 076

IB10 200 1 000 448 428 6 428 287 VAR3 290 250 434 325 6 438 160 IB11 290 250 448 535 6 429 313 VAR4 110 500 434 959 6 437 919 IB12 290 500 448 300 6 429 398 VAR9 20 500 434 733 6 438 543 IB13 290 1 000 447 830 6 429 569 VAR10 20 250 434 640 6 438 300 REG2-6 460 684 6 429 120 VAR11 200 250 434 478 6 437 835 VAR12 200 500 434 367 6 437 523 Regionale II VAR-14R 433 187 6 434 316 GRA-14R 469297 6554935 Reg2-7 421 831 6 457 534 _{Reg2-4 485867 6577412} SIG-17R 443 211 6 455 657 _{JO-30R 452182 6590203} SLE-41R 441 623 6 472 715 _{REG2-10 443670 6609362} ALF-15ref 430 394 6 484 057 HEM-22R 456430 6614401 Reg2-8 422 936 6 513 198 VA-13R 461199 6627052 BAL-27R 459203 6567845 Reg2-3 490702 6614517

SIGNY14 190 500 443 838 6 460 489 DA5 100 250 424692 6493213 DA6 100 500 425185 6493126 Sleipner øst DA7 100 1 000 426170 6492953 Loke 437 503 6 477 875 DA8 190 250 424157 6493054 Sleipner øst 436 699 6 473 583 DA9 190 500 424113 6492808 Sleipner A 436 150 6 470 271 DA10 190 1000 424026 6492315 LOK3 10 500 437 590 6 478 367 DA11 280 250 423954 6493343 LOK4 10 250 437 546 6 478 121 DA12 280 500 423708 6493387 SLA28 10 1 000 436 323 6 471 256 DA13 280 1000 423215 6493474 SLA-29 10 500 436236 6470763 DA4ny 10 2000 424547 6495270 SLA-X 10 250 436193 6470517 SLAY 90 250 436400 6470271 Volve 435054 6478574 SLA30 90 500 436650 6470271 VOV1 10 250 435097 6478820 SLAZ 90 1 000 437150 6470271 VOV2 10 500 435141 6479066 SLA33 190 250 436106 6470025 VOV3 10 1000 435228 6479559 SLA34 190 500 436063 6469779 VOV5 100 250 435300 6478531 SLA37 280 250 435903 6470314 VOV8 190 250 435011 6478328 SLA38 280 500 435657 6470358 VOV11 280 250 434808 6478617

Eirin 421230 6501620 Sleipner alpha nord 425470 6484925

Ei1 10 250 421273 6501866 ALF1 10 250 425513 6485171

Ei2 10 500 421317 6502112 ALF5 100 250 425716 6484882

Ei3 10 1 000 421404 6502605 ALF6 100 500 425962 6484838

Ei4 10 2000 421577 6503590 ALF11 280 250 425224 6484968

Ei5 100 250 421722 6501533

Ei6 100 500 422215 6501446 Sleipner vest 425099 6476101

Ei7 100 1000 423200 6501273 SLV1 10 250 425143 6476347 Ei8 190 250 421187 6501374 SLV2 10 500 425186 6476593 Ei9 190 500 421143 6501128 SLV3 10 1000 425273 6477086 Ei10 190 1000 421056 6500635 SLV6 100 250 425345 6476058 Ei11 280 250 420984 6501663 SLV11 190 500 425012 6475609 Ei12 280 500 420738 6501707 SLV16 280 500 424607 6476188 Ei13 280 1000 420245 6501794

GLI14 305 686 422200 6509385 H23 38 500 455152 6545892 GLI14ny 305 500 422351 6509277 H24 148 250 454977 6545286 H25 148 500 455109 6545074 Edvard Grieg 456619 6522928 H26 241 250 454625 6545377 LU1 10 250 456662 6523174 H27 247 1000 453969 6545013 LU2 10 500 456706 6523420 H28 328 250 454712 6545710 LU3 10 1 000 456793 6523913 H29 328 500 454579 6545922 LU4 10 2000 456966 6524898 H30 328 1000 454314 6546346 LU5 100 250 456865 6522885 H31 38 2000 456075 6547074 LU6 100 500 457111 6522841 LU7 100 1000 457604 6522754 Grane 470690 6558716 LU8 190 250 456576 6522682 GRA-3 290 250 470472 6558841 LU9 190 500 456532 6522436 GRA-2 300 500 470256 6558966 LU10 190 1000 456445 6521943 GRA-1 300 1000 469823 6559216 LU11 280 250 456373 6522971 GRA-19 300 2000 468958 6559716 LU12 280 500 456127 6523015 GRA-4 110 500 471122 6558466 LU13 280 1000 455634 6523102 GRA-5 110 1000 471555 6558216 REG2-12 210 15000 449119 6509938 GRA-18 20 2000 471374 6560595 REG2-13 30 20000 466619 6540249 GRA-17 20 1000 471032 6559656 REG2-14 330 22500 445369 6542414 GRA-16 20 500 470861 6559186 GRA-15 20 250 470776 6558951

Ivar Aasen 453825 6531824 GRA-9 90 500 471189 6558716

D32 108 250 454063 6531747 GRA-10 90 250 470959 6558716 D3 108 445 454248 6531685 GRA-11 200 250 470603 6558481 D27 108 1000 454776 6531515 GRA-12 200 500 470518 6558246 D28 170 250 453868 6531578 GRA-13 200 1000 470348 6557776 D2 170 495 453909 6531336 D5 185 1019 453744 6530808 Balder D29 262 250 453577 6531789 FPU 465000 6561700 D30 262 500 453330 6531754 Template A 463425 6561700 D19 262 985 452849 6531689 Template B 464513 6560202 D22 302 319 453554 6531993 Template C 466274 6560774 D31 335 500 453614 6532277 Template D 466274 6562626 D23 348 1200 453569 6532996 BAL16 198 250 464436 6559964 D34 108 2000 455727 6531206 BAL22 270 250 463175 6561700 D33 348 2000 453409 6533780 BAL37 135 250 464690 6560025 D35 30 250 453950 6532041 BAL42 180 250 463425 6561450

RIN5 135 250 468813 6569783 VIL8 330 250 459215 6613717 RIN6 135 500 468990 6569606 VIL9 330 500 459090 6613933 RIN11 225 500 468282 6569606 VIL11 240 250 459123 6613375 RIN12 225 250 468459 6569783 RIN13 315 250 468459 6570137 Vale 461200 6619050 RIN14 315 500 468282 6570314 VA01 45 250 461376 6619229 RINEx 290 420 468246 6570107 VA07 225 250 461022 6618875 VA08 225 500 460845 6618698 Jotun VA10 315 250 461022 6619229 Jotun A 465210 6591060 Jotun B 464100 6590600 Byggve 471528 6608998 JOT4 22,5 250 464196 6590831 BY1 10 250 471554 6609251 JOT5 135 250 464277 6590423 BY2 10 500 471605 6609481 JOT12 315 250 463923 6590777 BY4 100 250 471760 6608962 JOT13 225 250 463923 6590423 BY8 190 250 471492 6608762 BY11 288 250 471291 6609075 Alvheim 444575 6601617 KNA3 60 250 444792 6601742 Skirne 479732 6605335 KNA 9 240 250 444358 6601492 SK1 10 250 479766 6605574 KNA11 150 250 444700 6601400 SK2 10 500 479807 6605810 KNA12 330 250 444450 6601834 SK4 100 250 479984 6605279 SK8 190 250 479678 6605108 Heimdal 456430 6604401 SK11 274 263 479470 6605353 HEM Y 0 500 456430 6604901 HEM03 80 300 456754 6604458 HEM04 270 320 456110 6604401 HEM18 180 300 456430 6604101 HEM19 180 500 456430 6603901

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