All Industrial Users (IUs) that discharge strong waste and nutrients in excess of the treatment plant design load will be surcharged.
A "strong waste" is defined by the discharge concentration of Biochemical Oxygen Demand (BOD5) or Total Suspended Solids (TSS) that exceeds 250 milligrams per liter; Total Nitrogen (TN) that exceeds 40 milligrams per liter; Total Phosphorus (TP) that exceeds 8 milligrams per liter. The concentration of each parameter will be updated twice each year, on January 1st and July 1st, based on data generated by Chesterfield County, as well as any data submitted by the industries. The revenue created by these charges offsets the costs of treating their strong waste and high nutrient discharges.
((BOD – 250)(62.4 x V) x RBOD)
((TSS – 250)(62.4 x V) x RTSS)
((TN – 40)(62.4 x V) x RTN)
((TP – 8)(62.4 x V) x RTP)