$7.$X$1(8$ pts $)$ Non$-$point sources from a watershed discharge $5\mathrm{.}8{10}^{9}ga\frac{l}{y}r$ of water containing $14m\frac{g}{L}$ of total suspended solids $($TSS$)$ into a river. A wastewater treatment facility discharges $7\mathrm{.}90{10}^{5}l\frac{b}{y}r$ of TSS into the river. Assuming a $20\%$ margin of safety from all load allocations and waste load allocations, Determine the TMDL $(l\frac{b}{y}r)$ of the river.