All force mains shall be subjected to hydrostatic
pressure of seventy-five (75) psi minimum, or one hundred fifty (150%)
percent of the normal operating pressure, whichever is greater. The
duration of the test, at pressure, shall be at least six (6) hours.
Alternate test conditions are to subject the force main to a hydrostatic
pressure of two hundred (200) psi for two (2) hours without leakage.
Before conducting the test, the pipe shall be filled with water, and
all air shall be expelled. During the test, water shall be added,
as needed, to maintain the test pressure. The amount of water added
shall be recorded so as to calculate leakage. Leakage shall not exceed
twenty-five (25) gallons per twenty-four (24) hours per mile per nominal
pipe diameter in inches. During the test, the owner and the Superintendent
shall walk the route of the force main and examine the exposed pipe
and the ground covering any backfilled pipe to discover leaks. Leakage
in excess of that specified above shall be corrected with new material
at the owners expense and the test repeat. Any observed leaks shall
be repaired at the owner's expense. Each test section length shall
be as approved by the Superintendent, but in no event longer than
one thousand (1,000) feet.