6012. OTHER METHODS OF RELEASE DETECTION

6012 STATISTICAL INVENTORY RECONCILIATION 6012.1 A release detection method based on the application of statistical principles to inventory data similar to those described in § 6005 shall meet the requirements of this section. 6012.2 Statistical inventory reconciliation shall be conducted monthly and shall: Report a quantitative result with a calculated leak rate; Be capable of detecting a leak rate of two tenths of a gallon per hour (0.2 gal/hr) or a release of one hundred fifty (150) gallons within thirty (30) days; and Use a threshold for declaring a leak that does not exceed one half of the minimum detectible leak rate. 6012.3 An owner or operator using statistical inventory reconciliation shall verify the accuracy of the selected statistical inventory reconciliation method using a separate test procedure to confirm that the method can detect leaks at the required level in accordance with § 6012.2 and with the probabilities of detection and false alarm required in § 6000.9. 6012.4 An owner or operator using statistical inventory reconciliation shall ensure that the accuracy of the selected method has been evaluated and verified through independent third party certification and shall maintain these evaluation records for a period of ten (10) years. SOURCE: Final Rulemaking published at 40 DCR 7835 (November 12, 1993); as amended by Final Rulemaking published at 46 DCR 7699 (October 1, 1999); as amended by Final Rulemaking published at 67 DCR 1778 (February 21, 2020). District of Columbia Municipal Regulations Environment 20 DCMR § 6012