Issue Date: November 22, 1995
Revision Date: November 21, 2003

(originally listed as Entropy Limited)

Precision Tank Inventory Control System, Revision 90


Certification Leak rate of 0.1 gph with PD = 99.5% and PFA < 0.5%.
"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 22,500 gallons for single tanks.
Maximum of 60,000 gallons cumulative capacity for manifolded tank systems with no more than 3 tanks in system.
Data Requirement Minimum of 30 days of product level and flow through data.
Comments 32% of data sets evaluated were from manifolded tank systems. 
Of 56 data sets submitted for evaluation, 6 were not analyzed due to unusable data and none were inconclusive. 
Median monthly throughput of tanks evaluated was 52,207 gallons. 
Leak rates ranging from 0.0497 to 0.203 gph were used in evaluation. 
Data sets evaluated were supplied by evaluator.


Gilbarco/Veeder Root

Evaluator: Simpson, Gumpertz and Heger, Inc.

Attn: CMS Mailstop F-76

Tel:  (617) 643-2000

7300 West Friendly Ave.

Date of Evaluation:  11/30/93

P.O. Box 22087  
Greensboro, NC 27420-2087  

Tel:  (800) 253-8054



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