2-9 Section 203. Removing Drainage Structures, Culverts, and Sewers
203.01 Description
This work consists of removing or abandoning, in whole or in part, drainage structures, culverts, and sewers; salvaging, storing, and disposing of removed materials; and backfilling and compacting the excavated sites.
203.02 Materials
Provide materials in accordance with the following sections : Sound Earth .......................................................................................... 205 Granular Material Class III .................................................................... 902
203.03 Construction
A.Drainage Structures. When removing or abandoning a drainage structure, rebuild and reconnect live sewers through the removal area. Maintain service of live sewers during construction operations. If the plans show abandoning a drainage structure, remove the cover and break down the masonry in accordance with subsection 204.03. Dispose of materials in accordance with subsection 205.03.P and backfill in accordance with subsection 204.03.C.
B.Culvert Pipe. Completely remove pipe culverts as required, including en d treatments. Dispose of materials in accordance with subsection 205.03.P and backfill in accordance with subsection 204.03.C. Remove only the portions of the existing culvert pipe necessary to allow connection to the new work when extending an existing culvert or replacing the existing end treatment . Do not damage the remaining culvert pipe. Bulkhead abandoned culvert pipes in accordance with subsection
402.03 E or use other Department -approved methods . If the Engineer
determines that the culvert is not in suitable condition for abandonment, the Engineer will specify alternate treatment. For culvert pipes with a top elevation within 5 feet of the top of pavement and that requir e abandonment, review the abandonment treatment with the Engineer. MDOT Standard Specifications for Construction Section 203 2-10 C. Sewer Pipe. Remove sewers (storm, sanitary, or combined) or parts of sewers that requir e removal or that interfer e with the new construction. Dispose of materials in accordance with subsection 205.03.P and backfill in accordance with subsection 204.03.C. Remove only the part of the existing sewer necessary to allow the required connection to the new work when extending existing sewers or incorporating existing sewers into the new work . Trim the connecting sewer pipe edges to meet the required lines and grades without weakening or damaging those parts of the remaining sewer. Bulkhead abandoned sewers in accordance with subsection 402.03.E or use other Department -approved methods . If the Engineer determines that the sewer pipe is not in suitable condition for abandonment, t he Engineer will specify alternate treatment. For sewer pipes with a top elevation within 5 feet of the top of pavement and that requir e abandonment, review the abandonment treatment with the Engineer.
203.04 Measurement and Payment
Pay Item Pay Unit Dr Structure, Rem ..................................................................................... Each Dr Structure, Abandon .............................................................................. Each Culv, Rem, Less than 24 inch ................................................................... Each Culv, Rem, 24 inch to 48 inch ................................................................... Each Culv, Rem, Over 48 inch ........................................................................... Each Culv, End, Rem, Less than 24 inch ........................................................... Each Culv, End, Rem, 24 inch to 48 inch ........................................................... Each Culv, End, Rem, Over 48 inch ................................................................... Each Sewer, Rem, Less than 24 inch ................................................................. Foot Sewer, Rem, 24 inch to 48 inch ................................................................. Foot Sewer, Rem, Over 48 inch ......................................................................... Foot
A.General . Unless otherwise required, t he Engineer will measure structures or materials in the original positions. The unit prices for the removal pay items include the cost of breaking down structures and material; sawing, removal, and disposal; providing, placing, and compacting backfill; and providing and placing replacement soil or base material. The Department will pay for piling or timber cribs encountered during structure removal, but not shown on the plans, as extra work. MDOT Standard Specifications for Construction Section 203 2-11 B. Drainage Structure, Removal and Drainage Structure, Abandon . The unit prices for Dr Structure, Rem, and Dr Structure, Abandon include the cost of maintaining and reconnecting live sewers and of removing attached parts and connections.
C.Culvert, Removal and Culvert End, Removal . The Engineer will measure elliptical or pipe arch culverts across the greatest dimension. The cost of removing existing end treatments, regardless of type, is included in the unit prices for the related culvert removal or culvert end removal pay items.
D.Removal of Pipes ( Culverts, Sewers, Underdrains , etc.) w ith Diameters Less than 12 inches. The cost of removing pipes, including culverts, sewers, and underdrains, with diameters less than 12 inches is included in the unit price for constructing the new structure, culvert, or sewer if portions of the existing pipe are within the excavation limits of a new structure, culvert, or sewer .
E.Abandoning Pipe Culverts and Abandoning Sewers . The Department will not pay separately for abandoning pipe culverts and abandoning sewers. Unless included in the unit price for abandoning drainage structures, the Department will pay for bulkheads greater than 12 inches that are required in abandoning pipe culverts and abandoning sewers as Sewer Bulkhead of the type required, in accordance with subsection 402.04.D.
F.Removal of End Treatments. The Department will pay for removing end treatments on exist ing sewers as Culv End, Rem .
Source: Michigan Standard Specifications for Construction, 2020 Edition. Pages 135–137 of 1,146.