Issue Date: November 22, 1995
Revision Date: January 11, 2001

Computerizing, Inc.

Computank, Version 3.0


Certification 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.
Leak Threshold 0.05 gph. 
A tank system should not be declared tight if the test result indicates a loss or gain that equals or exceeds this threshold.
Applicability Gasoline, diesel.
Tank Capacity Maximum of 18,000 gallons.
Data Requirement Minimum of 30 days of usable product level and flow through data are required.
Comments 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.


Computerizing, Inc.

Evaluator:  Ken Wilcox Associates

PO Box 99

Tel:  (816) 443-2494

Scottsboro, AL  35768

Date of Evaluation:  09/17/92

Tel:  (256) 259-1805



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