HomeMy WebLinkAboutUtility Specifications-Wastewater Standard DetailsUtility Specifications
Sanitary Sewer Notes and Specifications
THESE NOTES SHALL APPEAR ON PROJECTS FOR THE WASTEWATER UTILITY.
1. All work and work material shall be in conformance with the standards and specifications
of the City of Renton Planning/Building/Public Works Department and the latest edition
of the WSDOT/APWA Standards and Specifications, as approved and modified by the
City of Renton in the Renton Standard Plans & Specifications. A set of approved plans
shall be kept on site at all times during construction.
2. The hours of work in the street right of way shall be per City specifications on weekdays
unless otherwise approved in writing by the Planning/Building/Public Works Department.
An approved traffic control plan must be obtained prior to beginning any work within
public right of way.
3. All locations of existing utilities shown are approximate and it shall be the contractor’s
responsibility to verify the true and correct location so as to avoid damage or
disturbance.
4. A pre-construction conference and a 24 hour notice shall be required prior to starting
new construction. It shall be the contractor's responsibility to secure all necessary
permits prior to starting construction. (Inspection will be accomplished by a
representative of the City of Renton.) It shall be the contractor's responsibility to notify
the Public Works inspector 24 hours in advance of backfilling all construction.
5. Contractor is solely responsible for the means, methods and sequences of construction
and for the safety of workers and others on the construction site.
6. It shall be the responsibility of the contractor to obtain street use and any other related
permits prior to any construction.
7. Plans approved by the City of Renton, Public Works Department shall take precedence
over all other plans.
8. A copy of these approved plans must be on the job site whenever construction is in
progress.
9. The contractor shall provide the City of Renton with an as-built drawing of the sanitary
sewer system, which has been stamped and signed by a licensed professional engineer
or licensed professional surveyor.
10. Backfill shall be placed equally on both sides of the pipe in layers with a loose average
depth of 6 inches, maximum depth of 8 inches, thoroughly tamping each layer to 95
percent of maximum density. These compacted layers must extend for one pipe
diameter on each side of the pipe or to the side of the trench. Materials to complete the
fill over pipe shall be the same as described.
11. Open cut road crossings for utility trenches on existing traveled roadway shall be
backfilled with crushed rock and mechanically compacted unless otherwise approved by
Utility Specifications
12. Datum for Vertical Control shall be North American Vertical Datum 1988 Meters, and for
Horizontal Control shall be North American Datum 1983/1991 Meters unless otherwise
approved by the City of Renton Public Works Department. Reference benchmark and
elevations are noted on the plans.
13. All disturbed areas shall be seeded and mulched or otherwise stabilized to the
satisfaction of the Department for the prevention of on-site erosion after the completion
of construction.
14. All pipe and appurtenances shall be laid on a properly prepared foundation in
accordance with the standards and specifications of the City of Renton
Planning/Building/Public Works Department and the latest edition of the WSDOT/APWA
Standards and Specifications, as approved and modified by the City of Renton in the
Renton Standard Plans & Specifications. This shall include necessary leveling of the
trench bottom or the top of the foundation material, as well as placement and
compaction of required bedding material, to uniform grade so that the entire length of
the pipe will be supported on a uniformly dense, unyielding base. Pipe bedding shall be
pea gravel 6 inches above and below the pipe.
15. Sanitary sewer pipe shall be polyvinyl chloride (PVC) rubber gasketed ASTM D 3034,
SDR 35, or ductile iron class 50, unless otherwise approved by the Wastewater Utility.
16. In unimproved areas, manhole to extend minimum 6 inches and maximum 12 inches
above finished grade or must have minimum 2’ diameter concrete ring poured at grade.
In paved area, cover must slope in all directions to match paving.