(a) The gas must be analyzed for the following components:

1. (1) Methane;
2. (2) Ethane;
3. (3) Propane;
4. (4) Iso Butane;
5. (5) Normal Butane;
6. (6) Pentanes;
7. (7) Hexanes + (C6+);
8. (8) Carbon dioxide; and
9. (9) Nitrogen.

(b) When the concentration of C6+ exceeds 0.5 mole percent, the following gas components must also be analyzed:

1. (1) Hexanes;
2. (2) Heptanes;
3. (3) Octanes; and
4. (4) Nonanes +.

(c) In lieu of testing each sample for the components required under paragraph (b) of this section, the operator may periodically test for these components and adjust the assumed C6+ composition to remove bias in the heating value (see § 3175.126(a)(3)). The C6+ composition must be applied to the mole percent of C6+ analyses until the next analysis is done under paragraph (b) of this section. The minimum analysis frequency for the components listed in paragraph (b) of this section is as follows:

1. (1) For high-volume FMPs, once per year; and
2. (2) For very-high-volume FMPs, once every 6 months.