(a) Adjust measured values for total vapor pressure as follows:
RVP (psi) = 0.956 · Ptotal - 0.347
Ptotal = Measured total vapor pressure, in psi.
(b) For measuring the sulfur content and benzene content of gasoline, adjust a given
test result upward in certain circumstances, as follows:
(1) If your measurement method involves a published procedure with a Pooled Limit of
Quantitation (PLOQ), treat the PLOQ as your final result if your measured result is
below the PLOQ.
(2) If your measurement method involves a published procedure with a limited scope but
no PLOQ, treat the lower bound of the scope as your final result if your measured
result is less than that value.
(3) If you establish a Laboratory Limit of Quantitation (LLOQ) below the lower bound
of the scope of the procedure as specified in ASTM D6259 (incorporated by reference
in § 1090.95), treat the LLOQ as your final result if your measured result is less than the LLOQ. Note that this option is meaningful only if the LLOQ is less than a published PLOQ,
or if there is no published PLOQ.
(c) For measuring the sulfur content of ULSD at a downstream location, subtract 2 ppm
from the result.
(d) For measuring the benzene content of butane and pentane, report a zero value if the
test result is at or below the PLOQ or Limit of Detection (LOD) that applies for the
(e) If measured content of any oxygenate compound is less than 0.20 percent by mass,
record the result as “None detected.”
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