Issue Date: March 11, 2008
Updated: April 21, 2015
Leak Detection Technologies
MDleak Enhanced Leak Detection Method
NON-VOLUMETRIC TANK TIGHTNESS TEST METHOD (TRACER)
Certification |
Leak rate of 0.005 gph with PD = 97.6% and PFA = 0% |
Leak Threshold |
A tank system should not be declared tight when chemical marker is detected outside of the tank system. |
Applicability |
Gasoline, diesel, aviation fuel, fuel oil #4, fuel oil #6,
solvents, waste oil, liquefied petroleum gas, natural gas. |
Tank Capacity |
Not limited by capacity. |
Waiting Time |
Ranges from 5 to 31 days after chemical marker is added to
the tank, when "Controlled Leak Points" are not used. |
Controlled Leak Points |
A "Controlled Leak Point" is a port where chemical marker is injected directly into the soil surrounding the UST to determine the rate at which chemical marker moves. It can be used to demonstrate that the chemical marker will migrate through the soil to a detection point in a documented amount of time, as described in manufacturer's procedures. |
Chemical Marker Dosage |
Dosage of chemical marker of either vapor, liquid or both is based on factors including tank size, tank volume, frequency and volume of tank refills, and is determined according to manufacturer's procedures. |
Soil Permeability |
Soil present during the evaluation was sandy in texture, with
water table 200 feet below the surface. |
Sampling |
When sampling in backfill, radius of influence of each
sampling port is a maximum 16 feet. |
Sample Analysis |
Two detectors were used during the evaluation: a helium
detector with minimum detection level of 2 ppm He, and a gas chromatograph
with minimum detection level of 1-10 picograms. |
Groundwater |
The method was
not evaluated with groundwater above the bottom of the tank. |
Comments |
*This method can be used to test single-walled components by
sampling in backfill or to test the primary containment inside of secondary
containment by sampling in the interstitial space. |
Leak Detection Technologies, Inc.
|
Evaluator: Ken Wilcox Associates |
1889 North Oracle Road |
Tel: (816) 443-2494 |
Tucson, AZ 85705
|
Date of Evaluation: 01/07/08
|
Tel: (855) 255-5325
|
|
E-mail: info@LeakDetect.net | |
URL: www.LeakDetect.net |
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this list is not to be construed as an endorsement by any regulatory agency nor
is it any guarantee of the performance of the method or equipment.
Equipment should be installed and operated in accordance with all applicable
laws and regulations. For full details, please refer to our expanded "DISCLAIMER"
page.