Tank design capacity (cubic meters) | Maximum HAP vapor pressure of off-site material 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 27.6 kPa | Level 1. |
Maximum HAP vapor pressure equal to or greater than 27.6 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. |
40 C.F.R. 63 app Table 3 to Subpart DD of Part 63