Activity Activity Description Immediate Predecessors Estimated Duration $($weeks$)$

A Assemble sensor components $4$

B Sites Investigation $6$

C Construct collection stack A $4$

D Pour concrete and install frame A$,$ B $8$

E Build high$-$temperature burner C $8$

F Install pollution control system C $6$

G Install air pollution device D$,$ E $10$

H Inspect and test F$,$ G $4$ Activity Activity Description Immediate Predecessors Estimated Duration $($weeks$)$

A Assemble sensor components $4$

B Sites Investigation $6$

C Construct collection stack A $4$

D Pour concrete and install frame A$,$ B $8$

E Build high$-$temperature burner C $8$

F Install pollution control system C $6$

G Install air pollution device D$,$ E $10$

H Inspect and test F$,$ G $4$ Activity Activity Description Immediate Predecessors Estimated Duration $($weeks$)$

A Assemble sensor components $4$

B Sites Investigation $6$

C Construct collection stack A $4$

D Pour concrete and install frame A$,$ B $8$

E Build high$-$temperature burner C $8$

F Install pollution control system C $6$

G Install air pollution device D$,$ E $10$

H Inspect and test F$,$ G $4$