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.01 Sanitary Systems

1. Provide manhole at change of directions.  Note:  See Manhole Details 15G-A and 15G-B.  Details are not yet available in WEB-based manual.
2. Sanitary sewer lines shall be either PVC, vitrified clay, or ductile iron.  All pipe shall have a premium watertight joint.
3. Minimum size storm and sanitary lines shall be six (6) inch.
4. All storm and sanitary lines shall be a minimum of 4 feet below grade and backfilled on the bottom and sides of the pipe to a height of one foot above the top of the pipe with PennDOT 2A Stone.  The remaining backfill material shall be earth, free of wood, ashes and other debris, but may contain rock pieces not larger than one cubic foot in volume, but consisting of not more than twenty-five percent rock by volume.  No other material shall be used as backfill.
5. All sanitary manholes shall be tested to establish no infiltration using either a hydraulic or pneumatic test.  All sanitary sewer lines shall be tested to establish no infiltration using a low pressure air test.  Coordinate with Engineering Services.
6. Provide clean-outs on building sanitary sewer laterals at changes in direction and at maximum intervals of 150 feet.

1. House traps are not required unless a specific request is made by the codes official.

1. Sanitary Manholes.
1. Manholes shall be provided at changes in direction.
2. Manholes shall be fitted with non-locking type or locking type (as required by service and indicated on drawings) heavy frame and cover.  The type of service shall be cast in each cover in three (3) inch high letters.
3. Provide manholes with cast-in-place rungs made of aluminum conforming to ASTM B221, alloy 6061T-6.  Coat the embedded ends of aluminum rungs with two coats of bituminous paint.  Space rungs 12" center to center.  Steps shall be 12" wide with five (5) inch projection from the wall and 4 1/2" projection into the wall.
4. Manholes shall be reinforced precast concrete and conform to ASTM C-478.  Provide suitable rubber gasketed joints which meet ASTM C443 between sections.  Manhole bases shall be cast-in-place concrete.  The top section of the manhole shall be of the eccentric cover type so that manhole steps form a straight ladder, for manholes 5'-0" and deeper.  Openings required that are not cast in the manholes must be machine core bored.
5. Provide invert channels of cast-in-place 3500 psi concrete.  The channel shall be smooth and accurately shaped to conform to the inside surfaces of the incoming and outgoing pipes.
6. Provide outside drop connections where the difference between the inflow and outflow elevation exceeds 2'0".  Encase the drop pipe and fittings in 3,500 psi concrete.
7. Joining of pipes to manholes shall be made thru rubber gaskets cast integrally in the manhole wall and located as required.  Joints shall meet the requirements of ASTM C443 and ASTM C425.
8. Refer to Details 15G-A and 15G-B (15G changed to Division 33).  Details are not yet available in WEB-based manual.