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Issue Date: August 23, 1999
Revision Date: February 22, 2017
EnviroSIR
LLC
EnviroSIR
Version 1.0
STATISTICAL
INVENTORY RECONCILIATION TEST METHOD (QUANTITATIVE)
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Certification
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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%
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Leak
Threshold
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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."
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Applicability
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Gasoline,
diesel.
Other more viscous liquids may be tested after consultation
with the vendor.
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Tank
Capacity
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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.
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Data
Requirement
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Minimum
of 28 days of usable product level and flow through data.
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System
Features
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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.
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Evaluation
Features
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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.
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Comments
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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).) |
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EnviroSIR LLC
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Evaluator: Ken Wilcox Associates
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1003 East Saint Mary Blvd., P.O. Box 52565
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Tel: (816) 443-2494
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Lafayette, LA 70505
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Date of Evaluation: 10/20/98
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Tel: (337) 233-2383
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