Only Answer Part B PLease

$1)$a$)$The town of Edinkira has filed a complaint with the state department of natural resources $($DNR$)$ that the city of Quamta is restricting its use of the Umvelinqangi River because of the discharge of raw sewage. The DNR water quality criterion for the Umvelinqangi River is $5$ mg O$2/$L$.$ Edinkira is $30$ km downstream from Quamta. What is the DO at Edinkira? What is the critical DO and where $($at what distance$)$ downstream does it occur? The following data pertain to the $7-$year, $10-$day low flow at Quamta. $\backslash$table$[[$Parameter$,$Wastewater,Umvelinqangi River$],[$Flowrate $($m$^(3)/$s$),0\mathrm{.}15,1],[$BOD$\_(5)$ at $20\backslash$deg C$($mgO$\_(2)/$L$),130,$N$/$A$],[$L$\_(0)$ at $20\backslash$deg C$($mgO$\_(2)/$L$),$N$/$A$,$negligible$],[$DO $($mgO$\_(2)/$L$),1,8],[$k$\_(1)$ at $20\backslash$deg C$(1/$d$),0\mathrm{.}28,$N$/$A$],[$k$\_(2)$ at $20\backslash$deg C$(1/$

B$)$Construct the DO Sag Curve for the Part I problem using DO values at nine given locations in the Umvelingqangi River.

$-$ Mixing point $($i$.$e$.,0$ km$)$

$-10$ km downstream

$-20$ km downstream

$-30$ km downstream

$-50$ km downstream

$-100$ km downstream

$-150$ km downstream

$-200$ km downstream

$-$ And, where critical DO occurs

In your graph, indicate where town Edinkira is located and where critical DO occurs.