MARCH 2019 PROJECT AQUA

STACKBO, GÄVLE, SWEDEN OVERALL GEOTECHNICAL INVESTIGATION

SOIL INVESTIGATION REPORT (SIR)

MARCH 2019 PROJECT AQUA

STACKBO, GÄVLE, SWEDEN OVERALL GEOTECHNICAL INVESTIGATION

SOIL INVESTIGATION REPORT (SIR)

ADRESS COWI AB

Södra Förstadsgatan 26

211 43 Malmö

Sverige

TEL 010 850 10 00

FAX 010 850 10 10

WWW cowi.se

PROJECT NO. DOKUMENT NO.

A070065 A070065-03-04-SIR-STACKBO-003

VERSION DATE OF ISSUE DESCRIPTION PREPARED CHECKED APPROVED

3.0 19.03.2019 SOIL INVESTIGATION REPORT SICO JEHA

STACKBO, GÄVLE, SWEDEN

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CONTENT

1 Generally 7

2 Object 7

3 Purpose 8

4 Project basis 8

4.1 Previous surveys 8

4.2 Basis for the investigation 8

5 Governing documents 8

6 Geotechnical category 10

7 Existing conditions 10

7.1 Topography and surface conditions 10

7.2 Existing constructions 11

8 Positioning 11

9 Geotechnical surveys 12

9.1 Generally 12

9.2 Field investigation in Area 1 12

9.3 Field investigation in Area 2 13

9.4 Calibration and certification 13

10 Geotechnical laboratory testing 14

10.1 Laboratory testing in Area 1 14

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10.2 Laboratory testing in Area 2 14

11 Hydrogeological surveys 15

12 Valuation of examination 15

APPENDIX

Appendix 1 Soil laboratory protocol

Appendix 2 Sieving protocol

DRAWINGS

Plan Drawing A070065-STACKBO-G01, scale 1:3000 (A1)

Boreholes Drawing A070065-STACKBO-G02, scale 1:100 (A1)

Boreholes Drawing A070065-STACKBO-G03, scale 1:100 (A1)

Boreholes Drawing A070065-STACKBO-G04, scale 1:100 (A1)

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1 Generally MS is considering acquiring a site north of Stockholm in the municipality of

Gävle. The area is called Stackbo and is planned for construction of Data halls.

COWI AB have been asked to conduct the Due Diligence for MS. In order to get

some information about the geotechnical conditions COWI have performed an

overall geotechnical survey on the site.

2 Object The site is located in the municipality of Gävle, approximately 15 km south west

of central Gävle and approximately 170 km north of Stockholm. For location, see

Figure 1.

Figure 1. Location of site Stackbo.

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3 Purpose The main purpose of the investigation was to create an overview of the soil

layers, the groundwater conditions and the technical properties of the soil.

Furthermore, the purpose was to identify possible adverse geotechnical issues

and recommendations for additional site investigation.

The following report presents the results of the geotechnical field and laboratory

investigations, carried out in the form of drawings and appendices.

Description of the geotechnical conditions is reported in a separate document,

entitled “Geotechnical interpretation report (GIR), Overall geotechnical

investigation, Project Aqua, Stackbo, Gävle, Sweden”, project no A070065 and

date of issue 19.03.2019.

4 Project basis

4.1 Previous surveys No geotechnical investigation has, what is known, previously been conducted in

the area.

4.2 Basis for the investigation As the basis for planning, conducting and reporting of geotechnical field

investigation, the following basis has been used:

› Geological maps from Swedish Geological Survey (SGU)

› Digital substrate with existing wires and cables

› Digital basic map obtained by the municipally of Gävle

5 Governing documents This report connects to SS-EN 1997-1 and associated national annex and TK Geo

13 (The Swedish Transport Administration's technical requirements for

geotechnical constructions).

For more information regarding governing documents for specific field and

laboratory investigations, see Table 1-Table 3.

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Table 1. Planning and presenting

Method Governing documents

Field planning SS-EN 1997-2

Field performance SGF Rapport 1:2013 Geoteknisk fälthandbok samt

SS-EN-ISO 22475-1

System of notations SGF/BGS beteckningssystem 2001:2

Table 2. Field investigation

Method Governing documents

Weight sounding (Vim) SIS-CEN ISO/TS 22476-10:2005

Ram sounding (HfA) SS-EN ISO 22476-2:2005 with addon

SS-EN ISO 22476:A1 2011

Percussion sounding with

registration (Slb)

SGF Rapport 1:2013, Geoteknisk Fälthandbok

Soil/rock probing (Jb) SGF Rapport 4:2012

Disturbed soil sampling Auger

drilling (Skr)

SGF Rapport 1:2013, Geoteknisk Fälthandbok

Hydrogeological measurements SS-EN ISO 22475-1:2006

Table 3. Laboratory test

Method Governing documents

Soil classification BTR T21:1982

Natural water content SS 027116, edition 3

Liquid limit SS 027120, edition 2

Ignition loss SS 027105

Sieving SSEN 933-1:2012

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6 Geotechnical category The surveys are conducted in accordance with the requirements for applying

Geotechnical Category 2 (GK2).

7 Existing conditions

7.1 Topography and surface conditions The site consists of undeveloped, forested land. The investigation area is divided

into two smaller areas; Area 1 and Area 2. For orientation, see Figure 2.

There are no known buildings on the site. Some gravel roads are crossing the

site, for example the road “Kabelvägen” and the road “Farfarsvägen”. The creek

“Valsjöbäcken” crosses the western part of the site from south to north.

Figure 2. Map of Stackbo site. The larger black boundary roughly corresponds to the site

limit. The red boundary lines represent the investigated areas.

Kabelvägen

Farfarsvägen

Area 1

Area 2

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The topography within the investigated areas is generally flat. The investigation

areas are shown as red boundary lines in Figure 2. Ground levels at the location

of conducted boreholes in Area 1 range from about +65 to +68 in west to about

+70 to +74 in east. In the southern part, Area 2, the ground levels vary between

+68 and +76.

The forest is dominated by pine and spruce. The site consists of a larger wetland

area in the eastern part of the site and there is a lot of large block and stones in

the surface. Figure 3 shows photos from the area.

Figure 3. Photos from the site.

7.2 Existing constructions There is a power line crossing the site from southeast to northwest. The power

line separates the two investigation areas.

8 Positioning Measurements in Area 1 have been performed by Metria AB and in Area 2 by

Orbicon AB. The measurements are reported in the coordinate system SWEREF

99 16 30 and in the height system RH 2000.

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9 Geotechnical surveys

9.1 Generally Geotechnical surveys have been performed on two different occasions.

The field investigation in Area 1 was conducted in September 2018. The field

work was carried out by Ronny Kratz and Robert Halvarsson, COWI AB. The

results were reported in a Soil Interpretation Report (SIR), document no

A070065-03-04-SIR-STACKBO-002 with a date of issue 23.11.2018.

The field investigation in Area 2 was conducted in January 2019. The field work

was carried out by Magnus Kippel under the direction of Joakim Wallgren at

Orbicon AB.

The field investigations were carried out with a geotechnical site investigation

rig. Sampling and handling of soil sample was performed in accordance with

Swedish standards for the respective investigation method.

9.2 Field investigation in Area 1 The geotechnical surveys in Area 1 were carried out in 11 boreholes, named

18CW301-18CW303, 18CW303B and 18CW304-18CW310. The location of the

investigation points was planned by future construction and availability for the

drilling rig due to thick forest and vegetation.

Table 4 below shows which field investigation have been conducted with each

method.

Table 4. Geotechnical field investigations in Area 1.

Investigation method Number Remark

Weight sounding (Vim) 10 pcs The soundings have stopped at a depth of

between 0.3 m and 2.2 m below ground level.

Percussion sounding with

registration (Slb) 8 pcs

The soundings have stopped at a depth of

between 0.5 and 3.6 m below ground level.

Soil/rock probing (Jb2) 2 pcs

The depth of rock was found at about 5.2 m and

about 10.1 m below ground level. The probing in

borehole 18CW308 has not been made to a depth

of a minimum 3 m in the rock due to the capacity

of the air compressor and lack of water.

Disturbed soil sampling

Auger drilling (Skr) 7 pcs

Disturbed soil sampling and soil description in the

field have been conducted to a depth of between

0.9 m and 2.2 m below ground level.

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The results of the surveys are presented on plan and section drawings, see

appendix.

9.3 Field investigation in Area 2 The geotechnical surveys in Area 1 were carried out in 11 boreholes, named

CW3201-CW3211. The location of the investigation points was planned by future

construction and availability for the drilling rig due to thick forest and

vegetation.

Table 5 below shows which field investigation have been conducted with each

method.

Table 5. Geotechnical field investigations in Area 2.

Investigation method Number Remark

Weight sounding (Vim) 11 pcs The soundings have stopped at a depth of

between 0.7 m and 1.4 m below ground level.

Ram sounding (HfA) 4 pcs The soundings have stopped at a depth of

between 0.8 m and 1.8 m below ground level.

Soil/rock probing (Jb2) 11 pcs

The depth to solid rock was found between 1.5 m

and 7.5 m below ground level. The probing in

borehole CW3203, CW3209 and CW3210 has not

been made to a depth of a minimum 3 m in the

rock due to the capacity of the air compressor

and lack of water.

Disturbed soil sampling

Auger drilling (Skr) 11 pcs

Disturbed soil sampling and soil description in the

field have been conducted to a depth of between

1.1 m and 3.0 m below ground level.

The results of the surveys are presented on plan and section drawings, see

appendix.

9.4 Calibration and certification Calibration of the geotechnical site investigation rig is saved by COWI and can

be sent to the customer upon request.

No abnormities were noted during the field surveys.

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10 Geotechnical laboratory testing

10.1 Laboratory testing in Area 1 Geotechnical laboratory tests have been carried out at MRM, a Civil and

Geotechnical Laboratory in Stockholm, in October 2018.

Table 5 below shows which laboratory analysis there have been conducted in

Area 1.

Table 5. Geotechnical laboratory analysis in Area 1.

Laboratory analysis stage 1 Number

Soil description 15 pcs

Natural water content 3 pcs

Ignition loss 3 pcs

Particle size distribution of soil by sieving 2 pcs

For laboratory protocol, see appendix no 1 and no 2.

10.2 Laboratory testing in Area 2 Geotechnical laboratory tests have been carried out at MRM, a Civil and

Geotechnical Laboratory in Stockholm, in February 2019.

Table 6 below shows which laboratory analysis there have been conducted in

Area 2.

Table 6. Geotechnical laboratory analysis in Area 2.

Laboratory analysis stage 2 Number

Soil description 20 pcs

Particle size distribution of soil by sieving 2 pcs

For laboratory protocol, see appendix no 1 and no 2.

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11 Hydrogeological surveys A free groundwater table was observed in 2 open boreholes when conducting the

field investigation in Area 1. The groundwater levels are recorded on boreholes

drawing, see appendix.

12 Valuation of examination Due to the weather conditions when conducting the field investigation in Area 2,

with approximately 0,1 m of snow on the ground, the soil classification in the

upper soil layers was difficult to determine. The top layer of humus was

estimated to be about 0,1 m.

During conducting the ram soundings in Area 2 an error with the ram

registration was observed. The ram registration (HfA) in borehole CW3204 was

counted twice. This has been solved by adjusting the raw data files afterwards.

Otherwise the investigations have been performed by the current standards.

Aqua Stackbo - SIR Appendix no 1, page 1/4

Aqua Stackbo - SIR Appendix no 1, page 2/4

Aqua Stackbo - SIR Appendix no 1, page 3/4

Aqua Stackbo - SIR Appendix no 1, page 4/4

Aqua Stackbo - SIR Appendix no 2, page 1/4

Aqua Stackbo - SIR Appendix no 2, page 2/4

Aqua Stackbo - SIR Appendix no 2, page 3/4

Aqua Stackbo - SIR Appendix no 2, page 4/4

GEOTECHNICAL INVESTIGATION

LAYOUT / PLAN BOREHOLES

1:3000 (A1) A070065-STACKBO-G01

A070065 SICO JEHA

2019-03-19 --

AQUASTACKBO, GÄVLE, SWEDEN

COWI ABSÖDRA FÖRSTADSGATAN 26211 43 MALMÖ

010-850 10 00

www.cowi.se

GEOTECHNICAL INVESTIGATION

BOREHOLES 18CW301-18CW310

1:100 (A1) A070065-STACKBO-G02

A070065 SICO JEHA

2019-03-19 --

AQUASTACKBO, GÄVLE, SWEDEN

COWI ABSÖDRA FÖRSTADSGATAN 26211 43 MALMÖ

010-850 10 00

www.cowi.se

GEOTECHNICAL INVESTIGATION

BOREHOLES CW3201-CW3206

1:100 (A1) A070065-STACKBO-G03

A070065 SICO JEHA

2019-03-19 --

AQUASTACKBO, GÄVLE, SWEDEN

COWI ABSÖDRA FÖRSTADSGATAN 26211 43 MALMÖ

010-850 10 00

www.cowi.se

GEOTECHNICAL INVESTIGATION

BOREHOLES CW3207-CW3211

1:100 (A1) A070065-STACKBO-G04

A070065 SICO JEHA

2019-03-19 --

AQUASTACKBO, GÄVLE, SWEDEN

COWI ABSÖDRA FÖRSTADSGATAN 26211 43 MALMÖ

010-850 10 00

www.cowi.se