The following are the results of a sieve analysis:

U.S Sieve No. |
Mass of soil retained (g) |

½ in. |
0 |

4 |
90 |

10 |
105 |

20 |
113 |

40 |
175 |

60 |
167 |

80 |
156 |

100 |
100 |

200 |
150 |

Pan |
115 |

a. Determine the percent finer than each sieve and plot the grain-size distribution curve.

**Develop a
spreadsheet for the computations and plotting required for
problems** and make sure to turn on “minor gridlines” for
the grain size axis. Please present the grain size distribution in
semi-log scale.

b. Determine D_{10}, D_{30}, and D_{60}
from the grain-size distribution curve.

c. Calculate the uniformity coefficient, C_{u}.

d. Calculate the coefficient of gradation, C_{c}.

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