The nurse reads a medication chart: Order: Augmentin $135 \mathrm{mg}$ p.o. q 8 hours for a 30-pound child with an upper respiratory infection. Augmentin is available in $135 \mathrm{mg} / 5 \mathrm{~mL}$. What is the daily dosage? The daily dosage is $\mathrm{mL}$.

Step 1 ：The medication is ordered to be given every 8 hours. Since there are 24 hours in a day, the child will receive \(\frac{24}{8} = 3\) doses in a day.

Step 2 ：The medication is available in a concentration of 135 mg/5 mL, so each dose will be 5 mL.

Step 3 ：Multiply the number of doses by the mL per dose to find the daily dosage: \(3 \times 5 = 15\) mL.

Step 4 ：Final Answer: The daily dosage is \(\boxed{15}\) mL.