40 CFR Part 63, Table 4
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
| Tank design capacity (cubic meters) | Maximum HAP vapor pressure of off-sitematerial managed in tank(kilopascals) | Tank control level |
|---|---|---|
| Design capacity less than 75 m3 | Maximum HAP vapor pressure less than 76.6 kPa | Level 1. |
| Design capacity less than 75 m3 | Maximum HAP vapor pressure equal to or greater than 76.6 kPa | Level 2, except that fixed roof tanks equipped with an internal floating roof and tanks equipped with an external floating roof as provided for in § 63.685(d)(1) and (2) shall not be used. |
| Design capacity equal to or greater than 75 m3 and less than 151 m3 | Maximum HAP vapor pressure less than 13.1 kPa | Level 1. |
| Maximum HAP vapor pressure equal to or greater than 13.1 kPa | Level 2. | |
| Design capacity equal to or greater than 151 m3 | Maximum HAP vapor pressure less than 5.2 kPa | Level 1. |
| Maximum HAP vapor pressure equal to or greater than 5.2 kPa | Level 2. |
[80 FR 14283, Mar. 18, 2015]