$(10$ points$)$ You have been asked to evaluate the ability of a grit chamber to remove particles

having a settling velocity of $0\mathrm{.}0008\frac{m}{s}.$ The surface area of the grit chamber is $520m^2.$ The

flow rate $(Q)$ entering to the grit chamber is $8200$ gallons$/$minute$.$

What is the percent removal of particles? gallon