§ 91-22. Tests.

A. 

Exfiltration tests.

(1) 

All sewers shall satisfy requirements of a final exfiltration test before they will be approved and sewage flow accepted from them by the Village. This test consists of filling the pipe with water to provide a head of at least five feet above the top of the pipe or five feet above groundwater, whichever is higher, at the highest point of the pipeline under test and then measuring the loss of water from the line by the amount which must be added to maintain the original level. In this test, the line must remain filled with water for at least 24 hours prior to the taking of measurements.

(2) 

Exfiltration shall be measured by the drop of water level in a standpipe with closed bottom end or in one of the sewer manholes available for measurement.

B. 

When a standpipe and plug arrangement is used in the upper manhole of a line under test, there must be some positive method of releasing entrapped air in the sewer prior to taking measurements. The test length intervals for either type of test shall be as ordered approved, but in no event shall they exceed 100 feet. In the case of sewers laid on steep grades, the length of line to be tested by exfiltration at any one time may be limited by the maximum allowable internal pressure on the pipe and joints at the lower end of the line. The test period, wherein the measurements are taken, shall not be less than two hours in either type of test.

C. 

Leakage.

(1) 

The total leakage of any section tested shall not exceed the rate of 100 gallons per mile of pipe per 24 hours per inch of nominal pipe diameter. For purposes of determining the maximum allowable leakage, manholes shall be considered as sections of forty-eight-inch diameter pipe, five feet long.

(2) 

The equivalent leakage allowance shall be four and five-tenths gallons per manhole per 24 hours for forty-eight-inch diameter manholes. If leakage exceeds the specified amount, the necessary repairs or replacements required shall be made to permanently reduce the leakage to within the specified limit, and the tests shall be repeated until the leakage requirement is met.