40 CFR Appendix Table C-4 to Subpart C of Part 53 - Table C–4 to Subpart C of Part 53—Test Specifications for PM 10, PM 2.5 and PM 10–2.5 Candidate Equivalent Methods

Table C–4 to Subpart C of Part 53—Test Specifications for PM 10, PM 2.5 and PM 10–2.5 Candidate Equivalent Methods
Specification PM 10 PM 2.5 PM 10–2.5
Class I Class II Class III Class II Class III
Acceptable concentration range (Rj), µg/m 3 15–300 3–200 3–200 3–200 3–200 3–200
Minimum number of test sites 2 1 2 4 2 4
Minimum number of candidate method samplers or analyzers per site 3 3 3 1 3 1 3 1 3 1
Number of reference method samplers per site 3 3 3 1 3 1 3 1 3 1
Minimum number of acceptable sample sets per site for PM 10 methods:
Rj <60 µg/m 3 3
Rj >60 µg/m 3 3
Total 10
Minimum number of acceptable sample sets per site for PM 2.5 and PM 10–2.5 candidate equivalent methods:
Rj <30 µg/m 3 for 24-hr or Rj <20 µg/m 3 for 48-hr samples 3
Rj >30 µg/m 3 for 24-hr or Rj >20 µg/m 3 for 48-hr samples 3
Each season 10 23 23 23 23
Total, each site 10 23 23 (46 for two-season sites) 23 23 (46 for two-season sites)
Precision of replicate reference method measurements, PRj or RPRj, respectively; RP for Class II or III PM 2.5 or PM 10–2.5, maximum 5 µg/m 3 or 7% 2 µg/m 3 or 5% 10% 2 10% 2 10% 2 10% 2
Precision of PM 2.5 or PM 10–2.5 candidate method, CP, each site 10% 2 15% 2 15% 2 15% 2
Slope of regression relationship 1 ±0.10 1 ±0.05 1 ±0.10 1 ±0.10 1 ±0.10 1 ±0.12
Intercept of regression relationship, µg/m 3 0 ±5 0 ±1 Between: 13.55 − (15.05 × slope), but not less than −1.5; and 16.56 − (15.05 × slope), but not more than + 1.5 Between: 15.05 − (17.32 × slope), but not less than −2.0; and 15.05 − (13.20 × slope), but not more than + 2.0 Between: 62.05 − (70.5 × slope), but not less than −3.5; and 78.95 − (70.5 × slope), but not more than + 3.5 Between: 70.50 − (82.93 × slope), but not less than −7.0; and 70.50 − (61.16 × slope), but not more than + 7.0
Correlation of reference method and candidate method measurements ≥0.97 ≥0.97 ≥0.93—for CCV ≤0.4; ≥0.85 + 0.2 × CCV—for 0.4 ≤CCV ≤0.5; ≥0.95—for CCV ≥0.5

1 Some missing daily measurement values may be permitted; see test procedure.

2 Calculated as the root mean square over all measurement sets.

[72 FR 32203, June 12, 2007]