Pennsylvania Publication 408 — Specifications — Section 607

606.1 606.4 STRUCTURES

606.1DESCRIPTION —This work is the grade adjustment of existing inlets, manholes, or utility boxes for

a vertical height of 6 inches or less.

606.2MATERIAL —

(a)Manhole and Inlet Extensions. From a manufacturer listed in Bulletin 15 or have the type of

extension accepted by the LTS before use. Use extensions composed of gray, malleable, or ductile iron conforming to the requirements of Section

1105.02(h); structural steel, Section 1105.02(a)2; or merchant quality steel conforming to ASTM A575

Fabricate the extensions to conform to the shape of the original manhole or inlet castings. They may be either welded in place or secured by a swedge fit. Weld according to the manufacturer's recommendations. Provide a locking device to ensure the swedge f it is permanent. C oat steel extensions with an asphalt paint, as specified in Section 605.2(a) .

(b)Additional Material. Conforming to the requirements specified for new structures.

(c)Certification. Section 106.03(b)3

606.3CONSTRUCTION —

(a)General. Excavate as necessary. Carefully remove and clean existing castings. Construct the structure

walls to the required elevation, as specified in Section 605.3, conforming to the type of construction and dimensions of the existing structure. Replace castings on a full mortar bed, as required. Remove existing walls if the existing structure elevation is higher than the proposed elevation or if directed because the walls are in an unsatisfactory condition. Rebuild as specified. Backfill as required. Repair or replace existing pavement, curb, and sidewalk damaged because of rebuilding. Satisfactorily dispose of unsuitable and surplus materials. Upon completion, clean each structure of accumulations of debris, mortar, or foreign matter, including existing material, and keep clean until final acceptance.

(b)Adjustable Extensions. Before placing pavement material, set the adjustable extension unit in the

existing inlet or manhole frame with the section resting on the flange. Secure the unit in place, according to the manufacturer's recommendations. Set the manhole cover or inlet grate in the flange formed by the adjustable extension unit.

606.4MEASUREMENT AND PAYMENT —Set

607.1 607.4

607.1DESCRIPTION —This work is rebuilding of existing inlets, manholes, or utility boxes of the types indicated

for vertical heights in excess of 6 inches.

607.2MATERIAL —Section 605.2

607.3CONSTRUCTION —Section 606.3(a). Install necessary additional manhole steps as required.

For inlets and manholes, reset the existing top unit , castings, frames, covers and grates at each location. If the top unit or grate is damaged during remov

Source: Pennsylvania Department of Transportation Specifications, 2026 Edition. Pages 508–509 of 1,522.

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606 GRADE ADJUSTMENT OF EXISTING MISCELLANEOUS STRUCTURES

608 MOBILIZATION