A common effluent treatment plant with a capacity of $2$ million litres per day (MLD) employs reverse osmosis (RO) for water reuse. The RO unit removes $95 \%$ of the total dissolved solids (TDS) and the water recovery rate is $70 \%$. If the TDS concentration in the RO feed is $8000$ parts per million (ppm), the TDS in the RO reject is $\_\_\_\_\_\_ \: \mathrm{g} / \mathrm{L}$. (rounded off to one decimal place)
