Table 4 to Subpart DD of Part 63 - Tank Control Levels for Tanks at Existing Affected Sources as Required by 40 CFR 63.685(b)(1)(ii)

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Table 4 to Subpart DD of Part 63 - Tank Control Levels for Tanks at Existing Affected Sources as Required by 40 CFR 63.685(b)(1)(ii)

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 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]

                    
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