Problem $4$: The metals concentrations $(m\frac{g}{k}g)$ of applied biosolids are as follows:

$As=45,Hg=5$

$Cd=30,Ni=350$

$Cu=1,200,Se=15$

$Pb=250,Zn=3100$

A: Determine if the biosolids are acceptable for land application.

B: If the biosolids are acceptable for land application, what is the allowable annual loading rate?

C: Compare calculations from problems $1,2,$ and $3,$ what is the maximum biosolids loading rate for $1$st year and $2$nd year.