lb 86000 ÷ 170000

pr

imar

y br

eaki

ng

tunn

ellin

g

narr

ow tr

ench

seco

ndar

y br

eaki

ng

prim

ary

brea

king

tunn

ellin

g

narr

ow tr

ench

seco

ndar

y br

eaki

ng

1550

11

1800

4

1700

8

1750

5

2050

138

2600

111

2350

124

2450

122

2050

111

2600

86

2350

101

2400

98

2050

94

2400

77

2200

86

2250

83

2050

81

2400

66

2100

75

2200

73

1900

70

2300

50

2050

61

2100

58

1900

61

2300

48

2050

57

2100

54

1900

53

2300

42

1950

49

2050

46

1800

48

2200

38

1950

45

2050

42

1700

42

2050

33

1800

37

1900

34

1700

40

2050

29

1800

36

1900

33