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Issue
Date: January 19, 2006
Leighton
O'Brien Pty. Ltd.
Monitor
/ Redone
STATISTICAL
INVENTORY RECONCILIATION TEST METHOD (QUANTITATIVE)
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Certification
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Leak
rate of 0.1 gph with PD > 99.6% and PFA < 0.4%
for both single and manifolded tank systems."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 0.2 gph
(0.1 gph for the 0.1 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 0.2 gph (0.1 gph for the 0.1 gph test)
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, kerosene.
Other
more viscous liquids may be tested after consultation
with the vendor.
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Tank
Capacity
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Maximum
of 33,675 gallons for single tanks.
Maximum of 60,000 gallons cumulative capacity for manifolded
tank systems with no more than 5 tanks in system.
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Data
Requirement
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Minimum
of 26 days of product level and throughput data.
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Comments
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Inventory
data for manifolded tank systems was prepared according
to the EPA protocol and submitted to vendor for analysis.
Single tank system inventory data was submitted by vendor
to evaluator who adjusted data and returned to vendor
for analysis.
Water ingress or gains are evaluated on an individual
basis by a certified SIR analyst.73% of data sets were
from manifolded tank systems. Of 56 data sets submitted
for evaluation, all were analyzed with conclusive results.
Median monthly throughput of tanks evaluated was 18,459
gallons. Leak rates of 0.05, 0.1, and 0.2 gph were used
in evaluation.Data is sent to a central location and
analyzed by a certified SIR analyst.
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Leighton
O'Brien Pty. Ltd.
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Evaluator: Ken Wilcox Associates
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96
Camberwell Rd., Suite 13
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Tel: (816) 443-2494
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Hawthorn
East, Victoria 3123, Australia
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Date
of Evaluation: 12/13/95, 12/15/05
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| Tel: (03) 9813 5122
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| E-mail:
enquiry@lob.com.au |
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URL:
http://www.lob.com.au
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