(a)³ (b)⁴

Relative Density

In-Situ Test Results

<30

< 28

Very Loose

0 to 4

SPT N-Value

(blows/300 mm

or blows/ft)

30 to 35

28 to 30

Loose

4 to 10

35 to 40

30 to 36

Medium

10 to 30

40 to 45

36 to 41

Dense

30 to 50

>45

>41

Very Dense

>50

<30

Very Loose

<20

Normalized

CPT cone

bearing

resistance

(qc/Pa)

30 to 35

Loose

20 to 40

35 to 40

Medium

40 to 120

40 to 45

Dense

120 to 200

>45

Very Dense

>200