For each problem, provide a table showing (for each activity in the network): Early Start Time (ES) Early Finish Time (EF) Late Start Time (LS) Late Finish Time (LF) Total Float (TF) Resource loadings (as appropriate) Be sure your network diagrams and Gantt charts are neat and legible. 1. The table on the next page lists activities for constructing a bridge over an operational railway line: a. Draw the network diagram for the project b. Do forward and backward pass calculations to indicate the ES, EF, LS, and LF c. Indicate(highlight) the critical path d. Indicate the TF and Free Float (FF) of each activity Activity Number A B C D F G HI K L M N P o R S T U W X Y Z AA Activity Description Detail site investigation and survey Detail Planning Detail design Preparation of site Relocate services Re-align overhead track electrification Access road and ramp construction Piling Construct foundations and abutments Construct temporary supports to support bridge deck during construction Fabrication planning of structural steel components Manufacture structural steel components (off-site) Transport structural steel components and erect on-site Erect pylons and fill with concrete Construct main span deck on pre-cast concrete beams Install cable-stays and lift deck off temporary supports Remove temporary supports Electrical system installation Roadway surfacing (paving) Finishing and ancillaries Commissioning-cut-over Formal hand-over and ceremony Project Sign-off Administrative closure Project End Duration (Months) Predecessors 6 6 4 3 2.3 N N 2 3 1 0 (milestone)