2.) In a short-bulleted list, describe the major differences between the USCS, USDA, and AASHTO soil

classification systems.

3.) Plot the modified proctor curve for the data collected in the Problem 2.xlsx file along with the S-80% line

and the Zero Air Voids line. Additionally, compute the range of water content values the contractor

should target for relative compaction values of 92% and 95% respectively.