#102 Line test report OBoats Noosaville

3rd Party Certified Testing of service lines: Test Results O Boats Noosaville

Scope of works – Methodology
DGC will supply suitably qualified and experienced technicians, equipment and material to carry out
EITs on the tank/s and or line/s in accordance with Australian Standard AS4897-2008 “The design,
installation and operation of underground petroleum storage systems” which references US EPA
regulations, Section 280.43 Tank Tightness Testing. As recommended in AS4897-2008, testing of
product lines will generally be conducted using pressure testing with an inert gas (Nitrogen).

In order to fulfil the project objectives the typical methodology proposed to be undertaken by DGC
at the site are as follows:

Tank testing:
        • Dip the tank for water and product note results.
        • Isolate applicable service lines connected to the tank “Vent, Dip, Fill etc”.
        • Calculate required vacuum to perform the EIT.
        • Slowly place the system under vacuum by extracting air and vapour from the tank.
        • Once the correct vacuum has been achieved stabilize the system for a minimum of 20 Min.
        • Monitor the system and log results on test form until a definitive result can be established.
        • Where a leak is detected, DGC use the soapy water test & or acoustic equipment to
        ascertain leak location.
        • De-isolate lines and allow system to slowly return to atmospheric pressure.

Line Testing:
        • Isolate the service line from UPSS and attach test fittings.
        • Inject nitrogen gas into line and monitor ability to maintain pressure for 10 minutes.
        • Test is generally repeated to confirm accuracy.

General:
       • Verbally relay results and estimate for any leaks repairable on the day of testing.
       • Prepare and submit a report summarizing works undertaken.

Testing Criteria – Tanks
The following describes the testing allowances employed by DG Compliance:

    •   Tank testing was completed with Mesa 2D Precision Test Equipment
    •   The Probability of Detection of a leak of 0.10 US gal/hr (380mL/hr) is greater than 95%
    •   The Probability of a False Alarm (declaring a “tight” tank to be leaking) is less than 5%
    •   The current US EPA standards dictates that for underground fuel tanks the maximum allowable
        Leak/Gain rate over the period of one hour is 0.050 US Gallons (+/- 0.190 L/hr)
    •   These are calculated, mathematical tolerances only and are not meant to indicate the
        permission of any leak




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