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Performance Report
UST Program - LG 113

UST Program - LG 113

Issue Date: November 22, 1995
Revision Date: May 23, 2007

Estabrook EZY CHEK Systems
(originally listed as Horner EZY CHEK)



Certification Leak rate of 0.1 gph with PD = 100% and PFA = 0%.
Leak Threshold A tank system should not be declared tight when the vacuum decay is more than 1 inch water column pressure for non-volatile products and 10% of the lower determined vapor pressure for volatile products, or when water ingress is detected by the water sensor.
Applicability Gasoline, diesel, aviation fuel, fuel oil #4, waste oil.
Other liquids may be tested after consultation with the manufacturer.
Tank Capacity Maximum of 12,000 gallons if groundwater is not present.
Maximum of 50,000 gallons if groundwater is present and a vacuum of 1.0 to 1.7 psi can be maintained.
For gasoline, ullage volume must be between 800 and 2,500 gallons.
For diesel, ullage volume must be between 500 and 1,500 gallons.
Waiting Time None between delivery and testing.
Test Period Minimum of 2 hours, 30 minutes for gasoline (1 hour, 30 minutes vapor equilibrium recirculation time* plus 1 hour test period) when groundwater is below bottom of tank.
Minimum of 1 hour, 30 minutes for diesel and less volatile products (30 minutes vapor equilibrium recirculation time* plus 1 hour test period) when groundwater is below bottom of tank.
Minimum of 1 hour when groundwater is above bottom of tank.
Test period based on water ingress depends on tank size and must be calculated in accordance with manufacturer's instructions.
Test data are acquired and recorded manually.
*The vapor equilibrium recirculation time is the time required to apply a vacuum and to saturate ullage with vapors.
There must be no dispensing or delivery during test.
Test Pressure Vacuum must be maintained between 1.0 to 1.7 psi at bottom of tank.
Vacuum must not be greater than 4.0 psi in ullage.
Temperature Vacuum decay is independent of product temperature.
Water Sensor Conductivity water sensor must be used to detect water ingress and must be calibrated for every test.
Minimum detectable water level is 0.014 inch. Minimum detectable change in water level is 0.0095 inch.
Minimum water level in tank must be adjusted to 0.014 inch before calibrating the sensor.
Groundwater Per California regulations, depth to groundwater in tank excavation backfill must be determined.
If groundwater is above bottom of tank, water sensor must be used and test time extended to ensure water ingress detection during test.
Comments Not evaluated using manifolded tank systems.
Evaluated using gasoline and diesel.
Test may not be effective in some tank excavation backfill (such as clay) because it may plug holes in tank.
If soil is saturated with product, air or water ingress may not be detected by vacuum test.
A well point in tank excavation backfill may help identify presence of this condition.


Estabrook EZY CHEK Systems

Evaluator:  Ken Wilcox Associates

1505 Woodside Ave.

Tel:  (816) 443-2494

Essexville, MI  48732

Date of Evaluation:  08/23/94, 02/08/95

Tel:  (989) 891-9868  
E-mail: sales@ezychek.com  

URL: www.ezychek.com


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