UST Programs - LG 113

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

Veeder-Root
(originally listed as Entropy Limited)

Precision Tank Inventory Control System, Revision 90

STATISTICAL INVENTORY RECONCILIATION TEST METHOD (QUANTITATIVE)

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	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 (0.2 gph for the 0.2 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 0.1 gph (0.2 gph for the 0.2 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 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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