You were accepted as an intern in an industrial wastewater treatment plant. The head of the laboratory of this plant asks you to measure BOD5 of the influent. The 5-day BOD of the influent is expected to be around 800 mg/L. Could you recommend two different dilution ratios suitable for BOD5 testing of this wastewater? Issues to consider while solving the question: (i) The minimum final DO concentration should not be lower than 2 mg/L, (ii) It is generally advisable to have several mg/L concentration differences between DOinitial and DOt=5d , (iii) The dilution ratio you recommend should correspond to a practically measurable volume for the mL of sample to be added into the BOD bottle (e.g., 3.333mL is not acceptable, but 3.5mL is acceptable).