Issue Date: August 23, 1999
Revision Date: February 22, 2017

EnviroSIR LLC

EnviroSIR Version 1.0

Statistical Inventory Reconciliation Test Method (Quantitative)

Certification Leak rate of 0.2 gph with PD = 97.4% and PFA = 0.1%
Leak rate of 0.1 gph with PD = 97.4% and PFA = 2.6%
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.
Other more viscous liquids may be tested after consultation with the vendor.
Tank Capacity Maximum of 45,000 gallons for single tanks.
Maximum of 45,000 gallons cumulative capacity for manifolded tank systems with no more than 4 tanks in the system.
Data Requirement Minimum of 28 days of usable product level and flow through data.
System Features Method of data analysis that system employs, and was used during evaluation process, is exclusive of any external control by vendor.
System consists of a fully automated software package with embedded algorithms for conducting leak detection testing. Consequently, third party evaluation procedure demonstrated that system can be used in-house with no requirement for direct vendor participation, except in certain rare cases when system generates a flag that requires a vendor trained and certified specialist to analyze data and make the final decision.
System incorporates context-sensitive "Help" information.
Evaluation Features Evaluator tested this system for in-house use. Computer program disk along with instructional documentation was supplied by vendor to evaluator. Evaluator, without vendor involvement, analyzed required data and performed evaluation using program disk and accompanying documentation. Vendor was not present during evaluation.
This system was also evaluated using a leak threshold of 0.1gph for leak rate of 0.2 gph and is available at the user's request.
Comments

53% of data sets evaluated were from manifolded tank systems.
Of 43 data sets submitted for evaluation, all were analyzed with conclusive results.
Median monthly throughput for tanks evaluated was 18,897 gallons.
Leak rates of 0.05, 0.10, and 0.20 gph were used in evaluation. Data sets evaluated were supplied by evaluator.

The listed method certified with a detectable leak rate of 0.2 gallons per hour and a leak threshold of 0.15 gallons per hour does not meet the Federal UST requirement for Statistical Inventory Reconciliation to use a threshold that does not exceed one-half the minimum detectable leak rate. (40 Code of Federal Regulations, part 280, subpart 43, subdivision (h), paragraph (3).)
  • EnviroSIR LLC
    1003 East Saint Mary Blvd., P.O. Box 52565
    Lafayette, LA 70505
    Tel: (337) 233-2383
  • Evaluator: Ken Wilcox Associates
    Tel: (816) 443-2494
    Date of Evaluation: 10/20/98

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