A low-pressure air test was conducted on the installed sanitary sewer to verify the integrity and watertightness of the pipeline in accordance with applicable municipal requirements and OPSS 410.

The segment of sewer between maintenance holes was isolated using approved pneumatic plugs, properly sized and secured to prevent movement under pressure. Compressed air was then introduced into the pipe in a controlled manner until the internal pressure reached 24 kPa (3.5 psi).

Following pressurization, a stabilization period was allowed to permit the air temperature within the pipe to equalize with ambient ground conditions. During this time, minor pressure fluctuations were observed and considered normal.

Once stabilized, the test commenced by monitoring the time required for the internal pressure to decrease from 24 kPa (3.5 psi) to 17 kPa (2.5 psi). The observed time was compared to the minimum allowable test duration as determined by OPSS 410, based on the pipe diameter and length of the pipe under test.

The sewer pipe is considered to have passed the test where the measured time meets or exceeds the minimum required duration, indicating leakage within acceptable limits. A failure is recorded where the pressure drop occurs more rapidly than permitted, suggesting potential deficiencies such as leaking joints, cracks, or improper installation. Any failed pipe must be repaired and retested until satisfactory results are achieved.

All testing equipment was verified to be in good working condition and suitable for the intended pressures. Appropriate safety precautions were followed throughout the testing process.

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