As one of the oldest sewage treatment plant in the Miami$-$Dade County, the Central District Wastewater Treatment Plant in Virginia Key has been pumping out most of the $300$ million gallons of treated waste generated each day miles out into the Atlantic Ocean through outfall pipes. In recent years, the pipes and pumps carrying the raw sewage and the facility that treated the county$$s waste has been badly corroded and decayed to such an extent that Miami$-$Dade illegally discharged waste more than $260$ times between $2006$ and $2012.$ To avoid further pollutions, Miami$-$Dade County is faced with the dilemma of whether to upgrade the facility, relocate the facility to inland, or do nothing.

$1-$ Identify $3$ threats and $2$ opportunities for upgrading the facility:

$2-$ Identify $3$ threats and $2$ opportunities for relocating the facility:

$3-$Please see attached image.

$4-$ What is the expected cost of the do$-$nothing option? $($in Millions$)$

$5-$What is the expected cost of the relocate option? $($in Millions$)$

$6-$Draw the decision tree diagram based on the above information