November 24, 2017

Division Three - Standards for Sanitary Sewers - Chapter III. Final Acceptance

Chapter III. Final Acceptance

Sec. 303-1 Cleaning

Prior to the acceptance of any sewer line by the County, the contractor shall clean all lines with a Wayne-type sewer cleaning ball under hydrostatic pressure. Any stoppage, dirt or foreign matter shall be removed from the lines and not be washed into the public sewer system. All cleaning and testing of sewer lines shall take place after all construction work is completed, up to but not including, the final paving. The system will be inspected after final paving is completed and any damage to the system during final paving and cleanup will be corrected before approval.

Sec. 303-2 Air Testing

Prior to final approval, all sewer lines shall be tested for leakage by low pressure air test. The method of test shall follow the procedures and methods as recommended by Uni-bell PVC Pipe Association's publication UNI-B-6-90, "Recommended Practice for Low Pressure Air Testing of Installed Sewer Pipe." Building drains which are not within the right of way shall be tested in accordance with the low pressure air testing procedures specified within the California Plumbing Code.

Sec. 303-3 Mandrell Testing PVC, ABS, and PVC Truss

The sewer mains shall be mandrelled to test for excessive deflection. 

Deflections in the installed sewer pipe shall not reduce the base inside diameter, as listed by the manufacturer, by more than 5% no less than thirty (30) days after backfill and compaction. After the time period, the Contractor, at his expense, shall hand-pull a mandrell, approved by the Engineer, through the installed pipe to demonstrate that deflections have not reduced the inside diameter below tolerance. If the mandrell fails to pass freely, the pipe shall be deemed to be over-deflected. Over-deflected pipe shall be uncovered, any damaged pipe replaced and the pipe again backfilled, compacted and tested at the Contractor's expense.

The Engineer may waive the thirty (30) day time period if the initial deflection, after backfill and compaction, reduces the manufacturer's listed base inside diameter less than 3.5%. Testing procedures for this requirement are the same as previously described. In the case of a non-passing test the Contractor, at his option, may replace over-deflected pipe as described in this section or revert to the requirements previously described for maximum 5% deflection.

The mandrell used to test for excessive defection shall be rigid and non-adjustable, have an odd number of vanes (nine minimum) and have an effective length of not less than its nominal diameter. Before use, the mandrell shall be passed through a go/nogo ring provided by the Contractor and approved for use by the Engineer. At the option of the County, the Engineer may choose to provide the mandrell and go/nogo ring for use by the Contractor.

Location

Public Services Building
2700 M Street, Suite 570
Bakersfield, CA 93301-2370
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Phone: 661-862-5100 
FAX: 661-862-5101 
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