Code of Federal Regulations Title 40. Protection of Environment § 40.86.1544 Calculation;  idle exhaust emissions

(1) Use the procedures, as applicable, in 40 CFR 1065.650 to determine the dilute wet-basis CO and CO₂ in percent.

(2) Use the procedure, as applicable, in 40 CFR 1065.650 to determine the raw dry-basis CO₂ in percent.

(3) Convert the raw dry-basis CO₂ to raw wet-basis. An assumption that the percent of water by volume in the raw sample is equal to the percent of raw dry-basis CO₂ minus 0.5 percent is acceptable. For example:

10.0% dry CO₂–0.5%=9.5% water

(1.00–0.095) (10.0% dry CO₂)=9.05% wet CO₂

(4) Calculate the CVS dilution factor (DF) by:

(5) Convert the dilute wet-basis CO to dilute dry-basis values. An assumption that the percent of water by volume in the sample bag is 2 percent is acceptable. For example:

Dilute dry CO=(dilute wet CO)/(1.00–0.02)

(6) Calculate the raw dry-basis CO values by:

Raw dry CO=(DF) (dilute dry CO)