1. (a) Deliveries, withdrawals and balance remaining must be recorded each operating day and data must be reconciled every thirty (30) days. Product deliveries must be reconciled with an appropriate device and data must be reconciled every thirty (30) days.

2. (b) SIR records must demonstrate the following:

   1. (1) Report a quantitative result with a calculated leak rate;
   2. (2) Be capable of detecting a leak rate of 0.2 gallon per hour or a release of one hundred fifty (150) gallons within thirty (30) days, with a probability of detection of 0.95 and a probability of false alarm of 0.05; and
   3. (3) Use a threshold that does not exceed one-half (1/2) the minimum detectible leak rate.
3. (c) The tank must be equipped with a drop tube and measured for water at least every thirty (30) days.
4. (d) The equipment used is capable of measuring the level of product over the full range of the tank's height to the nearest one-eighth inch (1/8").
5. (e) The regulated substance inputs are reconciled with delivery receipts by measurement of the tank inventory volume before and after delivery.
6. (f) Records must be submitted to a certified SIR vendor for evaluation. Only third party certifications that have been reviewed and approved by the National Work Group on Leak Detection Evaluations (NWGLDE), found at the NWGLDE Web Site, will be accepted (nwglde.org).
7. (g) SIR analysis reports must include a summary report of the quantitative results.
8. (h) Results of SIR analysis must be on premises for inspector review every thirty (30) days.
9. (i) This method is approved as release detection for tanks only.

Added at 23 Ok Reg 2261, eff 7-1-06

Amended at 25 Ok Reg 1867, eff 7-1-08

Amended at 32 Ok Reg 780, eff 8-27-15

Amended at 34 Ok Reg 121, eff 9-8-16 (emergency)

Amended at 34 Ok Reg 935, eff 9-11-17

Amended at 35 Ok Reg 985, eff 10-1-18