Each method of release detection for tanks used to meet the requirements of § 280.41 must be conducted in accordance with the following:
Note to paragraph (a). Practices described in the American Petroleum Institute Recommended Practice RP 1621, "Bulk Liquid Stock Control at Retail Outlets" may be used, where applicable, as guidance in meeting the requirements of this paragraph (a).
Nominal tank capacity | Minimum duration of test | Weekly standard (one test) | Monthly standard (four test average) |
550 gallons or less | 36 hours | 10 gallons | 5 gallons |
551-1,000 gallons (when tank diameter is 64 inches) | 44 hours | 9 gallons | 4 gallons |
551-1,000 gallons (when tank diameter is 48 inches) | 58 hours | 12 gallons | 6 gallons |
551-1,000 gallons (also requires periodic tank tightness testing) | 36 hours | 13 gallons | 7 gallons |
1,001-2,000 gallons (also requires periodic tank tightness testing) | 36 hours | 26 gallons | 13 gallons |
40 C.F.R. §280.43