A small environmental remediation company has proposed the schedule given below for a client project. Use the information in the table to construct an activity-on-arc PERT network diagram before answering the questions below.

a) What is the smallest number of days in which the project can be completed? Which activities are critical to on-time completion?

A activity planning B Site testing C Piping layout predecessor duration people activities (days) required none 3 3 A 4 1 A 2 2 D Model capture B 5 1 E Model interface B 2 2 F Filter modules C 3 2 G Foundation modules C 2 2 H Pumping structure C 2 3 Implementation E, F, G 2 2 JFinal testing D, H, I 2 3