D.C. Mun. Regs. tit. 20, § 6005
Inventory Control [Statistical Inventory Reconciliation (SIR)]
Effective Feb 21, 202067 DCR 1778Authority: Section 107 of the District Department of the Environment Establishment Act of 2005, effective February 15, 2006 (D.C. Law 16-51; D.C. Official Code § 8-151.07 (2013 Repl. & 2019 Supp.)); the District of Columbia Underground Storage Tank Management Act of 1990, effective March 8, 1991 (D.C. Law 8-242; D.C. Official Code §§ 8-113.01 et seq. (2013 Repl.)); Sections 11 and 21 of the Water Pollution Control Act of 1984, effective March 16, 1985 (D.C. Law 5-188; D.C. Official Code §§ 8-103.10 & 8-103.20 (2013 Repl.)); and Mayor's Order 2006-61, dated June 14, 2006. 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); as amended by Final Rulemaking published at 67 DCR 1778 (February 21, 2020).District of Columbia, Office of the Secretary
6005 INVENTORY CONTROL AND STATISTICAL INVENTORY RECONCILIATION
6005.1 A release detection method that uses product inventory control shall meet the requirements of this section.
6005.2 An owner or operator may use product inventory control as the sole method of release detection only for heating oil tanks.
6005.3 Product inventory control shall be conducted monthly to detect a release of at least the combined amount of one percent (1%) of flow-through plus one hundred thirty (130) gallons on a monthly basis in the following manner:
- (a) Inventory volume measurements for regulated substance inputs, withdrawals, and the amount still remaining in the tank shall be recorded each operating day;
- (b) The measurement 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 (1/8) of an inch;
- (c) The regulated substance inputs shall be reconciled with delivery receipts by measuring the tank inventory volume before and after delivery;
- (d) Each delivery shall be made through a drop tube that extends to within six (6) inches of the tank bottom;
- (e) Product dispensing shall be metered and recorded using devices that are registered with the Department of Consumer and Regulatory Affairs Office of Weights and Measures and in compliance with the Registration and Inspection of Weighing and Measuring Devices Amendment Act of 2004, effective December 7, 2004 (D.C. Law 15-205; D.C. Official Code §§ 37-201.01 et seq.), or within an accuracy of six (6) cubic inches for every five (5) gallons of regulated substance withdrawn; and
- (f) The water level at the bottom of the tank shall be measured at least once each month to the nearest one eighth (1/8) of an inch.
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).