Table 1 Site description. Length indicates the length of the sheet pile that was sampled.

From: Methanogens predominate in natural corrosion protective layers on metal sheet piles

Site name

Site

Length (m)

Sheet pile age (years)

Soil Material

layers sampled

Depth sampled (m)

Number of piles sampled

Number of samples per depth per layer

AZ

Zeeburgertunnel 52°21′46.9″N 4°57′26.3″E

13

30

peat

DL, AS & BS

5, 5.7, 7, 9, 13

1

3

NLL

Nieuwlekkerland 51°53′17.1″N 4°38′57.5″E

17

26

clay & peat

DL, AS & BS

1, 3, 7, 10, 15

1

3

WK

Westerkade 51°54′21.7″N 4°28′41.2“E

11.5

67

sand

DL

0.5, 1.5, 2.5, 4.5, 7.5, 9.5, 11.5

1

3

HI

Hollandse Ijsselkade 51°55′02.4″N 4°34′48.9″E

3.5

56

nd

DL, AS & BS

0.3, 1, 1.7

2

2

GB

Giessenburg 51°51′51.2″N 4°52′49.3″E

5

20–30

clay & peat

DL & BS

0.5, 1, 2, 3.5, 4.5

2

3

  1. The sheet pile age is the approximately time that the sheet pile was in the soil. Samples: DL = deposition layer, AS = attached soil, BS = bulk soil.