7.2.1.2 Groups 2, 3, and 4—Collect the sample at ambient
temperature. After sampling, close the sample bottle immediately
with a tight-fitting closure.
7.2.1.3 If the sample received by the testing laboratory has
been sampled by others and it is not known whether sampling
has been performed as described in 7.2, the sample shall be
assumed to have been so sampled.