A new road section with concrete pavement, shown in longitudinal section, is 11,600 feet long. It is to be constructed in accordance with the following conditions:

The balanced earthworks from station 00 to 58(00) may be done at the same time as the balanced earthworks from station 58(00) to 116(00) using two separate independent crews.

The double-box culvert will be built by one crew, and another crew will build the two small culverts. Concrete may be supplied either from the paving batch plant or from small independent mixers at the culvert sites, whichever is expedient.

One small slip-form paver will do all the concrete paving work, and all the shouldering will then follow with one crew after the concrete pavement is cured.

Seeding the embankments with grass must be left as late as possible.

Prepare a network diagram and determine the minimum possible project duration.

If independent concrete mixers are used for the culverts, what is the latest day for delivery of the paving batch plant to the site, so that the paving crew may have continuity of work (no idle time at all)?

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Activity Description Deliver rebars double-box culvert Move in equipment Deliver rebars-small culverts Set up paving batch plant Order and deliver paving mesh Build and cure double-box culvert, station 38 Clear and grub, station 00-58 Clear and grab, station 58-116 Build small culvert, station 85 Move dirt, station 00-58 Move part dirt, station 58-116 Build small culvert, station 96 Cure small culvert, station 85 Cure small culvert, station 96 Move balance dirt, station 58-116 Place subbase, station 00-58 Place subbase, station 58-116 Order and stockpile paving materials Pave, station 58-116 Cure pavement, station 58-116 Pave, station 00-58 Cure pavement, station 00-58 Shoulders, station 00-58 Shoulders, station 58-116 Guardrail on curves Seeding embankments with grass Move out and open road Duration 10 MOKGGGHHnggaaSAS 3 10 8 10 40 10 8 14 27 16 14 10 10 4 7 10 10 2 3