3. A soil sample was taken to the lab and prepared for sieving. The technician sieved the soil and performed Atterberg limit tests on the finer fraction of that

soil (passing the # 40 sieve). These were found to be 40 and 30. The sieving data for the soil are presented below.

sieve

mass

sieve #

(gr)

20mm

20 139.22

6.4mm 6.4 136.75

4

4.75

122.10

10

2

121.05

20

0.85

115.65

40

0.42

112.12

60

0.25 110.77

100

0.15

109.56

200

0.075 108.10

pan

77.50

d

(mm)

mass of

sieve + soil

(gr)

139.31

136.77

129.10

137.54

138.91

128.54

121.34

117.99

118.20

188.92

a. Use Excel to Plot the GSD of the soil.

b. Use the USCS to classify the soil (show work). Provide the group symbol.