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Issue Date: November 22,
1995
Revision Date: January 11, 2001
Computerizing,
Inc.
Computank,
Version 3.0
STATISTICAL
INVENTORY RECONCILIATION TEST METHOD (QUANTITATIVE)
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Certification
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Leak
rate of 0.1 gph with PD = 99.5% and PFA = 2%.
"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.
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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 0.1 gph,
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 0.1 gph 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 18,000 gallons.
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Data
Requirement
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Minimum
of 30 days of usable product level and flow through data
are required.
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Comments
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Not
evaluated using data from manifolded tank systems.
Of 41 data sets submitted for evaluation, 17 were not
analyzed.
Median monthly throughput of tanks evaluated was 2,340
gallons.
Leak rates of 0.05, 0.1, and 0.2 gph were used in evaluation.
Data sets evaluated were supplied by evaluator.
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Computerizing,
Inc.
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Evaluator: Ken Wilcox Associates
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PO
Box 99
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Tel: (816) 443-2494
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Scottsboro,
AL 35768
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Date
of Evaluation: 09/17/92
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Tel: (256) 259-1805
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