Issue Date: November 22, 1995
Revision Date: May 5, 2003
RECONCILIATION TEST METHOD (QUANTITATIVE)
||Leak rate of 0.1
gph with PD = 99.0% and PFA = 1%.
"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.
A tank system should not be declared tight if the test result indicates a
loss or gain that equals or exceeds this threshold.
Gains (water ingress) are analyzed and evaluated on an individual basis.
||Maximum of 18,000
||Minimum of 90
days of product level and flow through data are required before making the
Following the first evaluation, subsequent evaluations are made based on
minimum of 30 days of data.
using manifolded tank systems.
Of 41 data sets submitted for evaluation, 5 were inconclusive.
Median monthly throughput of tanks evaluated was 14,600 gallons.
Leak rates of 0.05, 0.1, and 0.2 gph were evaluated.
Data sets evaluated were supplied by vendor.
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