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Section 38 – Sewer and Storm Drain Construction

38-10.02.D Hydrostatic Test for Leakage – Storm Drain

If, in the opinion of the Inspector, excessive groundwater is encountered in the construction

of a section of the storm drain, the exfiltration test for leakage shall not be used.

The end of the storm drain at the upper structure shall be closed sufficiently to prevent the

entrance of water, and pumping of groundwater shall be discontinued for at least three (3)

Calendar Days, after which the section shall be tested for infiltration.

The infiltration into each individual reach of storm drain between adjoining manholes shall

not exceed five hundred (500) gallons per inch of internal diameter per mile per day.

The allowable infiltration for any portion of the storm drain system shall be measured by a

weir or current meter placed in the appropriate manhole.

38-10.02.D.(1) Water Exfiltration Test

The allowable water exfiltration for any length of the storm drain pipe between manholes

shall be measured and shall not exceed five hundred (500) gallons per inch of internal pipe

diameter per mile of pipe per day. The maximum testing pressure at any joint shall be five

pounds per square inch (5 psi) or eleven and one-half feet (11.5’) of head. If it is not possible to

test the pipe to five pounds per square inch (5 psi), the system shall be tested to the surface of

the lowest manhole or inlet rim in the section tested. In lieu of water exfiltration testing, the

Contractor may perform air testing as described below.

The Contractor is responsible for providing all equipment, materials, water and labor for

performing infiltration and exfiltration tests and making measurements. Payment for these items

will be included in the bid items for pipes and manholes. All tests shall be made in the presence

38-10.03 Tests for Deflection

Unless otherwise shown or specified in these Specifications or in the Contract, where PVC,

ABS, or HDPE pipe are installed as sewer a deflection test shall be made by the Contractor

upon completion and acceptance by the Agency of all backfill operations and prior to the

placement of the aggregate base, if any. Deflection testing shall be conducted no sooner than

thirty (30) Calendar Days following completion and acceptance of all backfill operations, unless

otherwise approved by the Agency.

The deflection testing will be witnessed by the Agency and shall be conducted by the

Contractor at the Contractor’s expense. One-hundred percent (100%) of all mainline PVC,

ABS, or HDPE sewer installed shall be deflection tested for excessive vertical deflection using a

pre-sized, rigid mandrel or "Go-No-Go" device approved by the Agency. The mandrel size shall

be clearly labeled and shall be sized so as to provide a diameter of at least ninety-seven

percent (97%) of the base internal diameter as specified in ASTM Designations: D 3034 or D

2680 for PVC, and ABS or AASHTO Designations: M294 or MP7-97 Type S or Type D for

HDPE. The mandrel shall be drawn through the pipe using only the force that can be exerted

by one man on the end of a rope, using no mechanical advantage. Under no conditions shall

the mandrel device be attached to the cleaning ball.

The Contractor shall remove, replace, and retest any pipe section through which the

mandrel is unable to pass. The use of any rerounding device or similar method to correct or

reduce over deflection will not be permitted. Re-tests for deflections shall be made at the

Contractor’s expense.