Issue Date: January 19, 2006
Leighton O'Brien Pty. Ltd.
Monitor / Redone
Statistical Inventory Reconciliation Test Method (Quantitative)
| Certification | Leak rate of 0.1 gph with PD < 99.6% and PFA > 0.4% for both single and manifolded tank systems."If a method meets the requirement for detecting a leak rate of 0.1 gph, it will meet the requirement for 0.2 gph.", according to "Standard Test Procedures for Evaluating Leak Detection Methods: Statistical Inventory Reconciliation Methods", EPA/530/UST-90/007, June 1990, Section 7.2.3, page 30. |
|---|---|
| Leak Threshold | If the absolute value of the calculated leak rate (gain or loss) is less than the leak threshold and the minimum detectable leak rate is less than or equal to 0.2 gph (0.1 gph for the 0.1 gph test), the test result is "pass." If the absolute value of the calculated leak rate is greater than or equal to the leak threshold, the result is "fail." If the minimum detectable leak rate exceeds 0.2 gph (0.1 gph for the 0.1 gph test) and the absolute value of the calculated leak rate is less than the leak threshold, the test result is "inconclusive." |
| Applicability | Gasoline, diesel, kerosene. Other more viscous liquids may be tested after consultation with the vendor. |
| Tank Capacity | Maximum of 33,675 gallons for single tanks. Maximum of 60,000 gallons cumulative capacity for manifolded tank systems with no more than 5 tanks in system. |
| Data Requirement | Minimum of 26 days of product level and throughput data. |
| Comments | Inventory data for manifolded tank systems was prepared according to the EPA protocol and submitted to vendor for analysis. Single tank system inventory data was submitted by vendor to evaluator who adjusted data and returned to vendor for analysis. Water ingress or gains are evaluated on an individual basis by a certified SIR analyst.73% of data sets were from manifolded tank systems. Of 56 data sets submitted for evaluation, all were analyzed with conclusive results. Median monthly throughput of tanks evaluated was 18,459 gallons. Leak rates of 0.05, 0.1, and 0.2 gph were used in evaluation.Data is sent to a central location and analyzed by a certified SIR analyst. |
- Leighton O'Brien Pty. Ltd.
96 Camberwell Rd., Suite 13
Hawthorn East, Victoria 3123, Australia
Tel: (03) 9813 5122 - Evaluator: Ken Wilcox Associates
Tel: (816) 443-2494
Date of Evaluation: 12/13/95, 12/15/05
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