A wastewater treatment plant is discharging its effluent to a river, and an unacceptably low level of dissolved oxygen $(<6$ mg $/$ L$)$ occurs downstream. As a short$-$term measure until the treatment plant's design can be upgraded, the treatment plant operators are considering oxygenating their effluent. Given the stream and wastewater characteristics shown below, determine if it is possible to alter the wastewater's D$.$O$.$ level sufficiently to keep the river D$.$O$.$ level above $6\mathrm{.}0$ mg $/$ L$.$ Rate Constants: K$\_2=0\mathrm{.}3/$ d $($reaeration$)$ K$\_1=0\mathrm{.}23/$ d $($BOD utilization$)$ Note C$^*=$C$\_$s $(=$ the saturation concentration of dissolved oxygen$)$