Section 20-6005. INVENTORY CONTROL [STATISTICAL INVENTORY RECONCILIATION (SIR)]

 

6005.1Inventory Control [Statistical Inventory Reconciliation (SIR)], shall be conducted monthly to detect release of at least two-tenths gallons per hour (0.2 gal/hr) with a minimum probability of detection of ninety-five one-hundredths (0.95) and a minimum probability for false alarm of five one-hundredths (0.05).

 

6005.2Owners or operators shall evaluate the accuracy of the selected SIR method by using a separate test procedure to confirm that SIR method can detect leaks at the required level and with the appropriate probabilities of detection and probability of false alarm stated in § 6005.1. Owners or operators may have the accuracy of the selected SIR method evaluated and verified through independent third-party certification. Owners or operators shall maintain these evaluation records for a period of ten years.

 

6005.3The equipment used shall be capable of measuring the level of product over the full range of the tank's height to the nearest one-eighth inch (1/8").

 

6005.4Each delivery shall be made through a drop tube that extends to within six inches (6") of the tank bottom.

 

6005.5The dispensing of regulated substances shall be metered and recorded within District of Columbia standards for meter calibration or an accuracy of six cubic inches (6 cu.") for every five (5) gallons of regulated substance withdrawn.

 

6005.6The water level at the bottom of the tank shall be measured at least once each month. The measurement of any water level in the bottom of the tank shall be made to the nearest one-eighth inch (1/8").

 

source

Final Rulemaking published at 40 DCR 7835, 7870 (November 12, 1993); as amended by Final Rulemaking published at 46 DCR 7699 (October 1, 1999).