ABANDONMENT OF PIPE AND STRUCTURES

ABANDONMENT OF PIPE AND STRUCTURES


PART 1 - GENERAL

1.1      THE REQUIREMENT

A. The  Contractor  shall  furnish  all  labor,  tools,  equipment,  materials,  and  supplies  to complete the work as indicated on the drawings and specified herein.

B.    This Section covers the work necessary for the abandonment of pipe and structures.

C. Existing pipe and structures shall be abandoned per SSPWC 306-5, as specified herein, and as shown on the drawings.  Manhole cones and adjusting rings shall be completely removed and disposed of, unless otherwise shown.

D. Manholes and structures to be abandoned shall be perforated or cored through the base and filled with sand.

E. The  Contractor  shall  repair  or  replace  all  asphalt,  concrete  pavement,  earthwork, landscaping, or other surface damaged by the abandonment operations.

F. Existing pipe and structures shall be abandoned in accordance with the construction sequence specified.   Under  no circumstances  shall abandonment take place before existing sewers and manholes are out of service and all flow is directed to new or alternate pipes.

G.         Pipelines

1. Abandonment by Plugging:  Abandonment of 2-inch mains shall include a new galvanized plug fitting installed directly into the tee fitting or corporation stop located on the remaining active main.   When called for on the drawings, abandoned mains 3-inch and larger shall be plugged with a plugged fitting at points specified.

2. Abandonment by Grout Fitting:  When called for on the drawings, the abandoned main shall be grout filled by pumping a grout mixture into the main.  The main shall be completely filled, leaving no voids or air spaces.  Grout mix shall be as specified in this Specification.

3. Abandonment by Sealing:   All below grade pipe to be abandoned by sealing, either as noted on the drawings or as a result of demolition of a structure, shall be sealed with grout or Class C concrete.  The grout or concrete shall extend into the  pipe  for  at  least  12-inches,  forming  a  solid  waterproof  plug  completely bonded to the pipe.

H. Structures:  The structure shall be removed to a point 36-inches below grade or as noted on the drawings.  The remaining structure shall be filled with soil, free of organic matter or other deleterious material, compacted to 90 percent of maximum density.   All pipes leading in and out of the structure to be abandoned shall be sealed or grout filled in accordance with this Specification and as indicated on the drawings.  The portion of the structure to be removed shall be removed from the site and disposed of at an approved disposal facility.

1.2      SUBMITTALS

A.    Submittals shall be made in accordance with the General Conditions.

B. The  Contractor  shall  submit  for  review  to  the  Resident  Project  Representative  the methods, materials, and procedures to be used.

1.3      QUALITY ASSURANCE

A. The Contractor shall demonstrate that pipe and structures to be abandoned have been completely filled, without voids, by providing volume calculations for each placement of grout and materials strength tests as required by the Engineer.

PART 2 - PRODUCTS

2.1      SAND

A.         Sand shall be per SSPWC-200-1.5.3

2.2      MORTAR AND BRICKS

A.         Mortar shall be Class D, per SSPWC-201-5.1. Bricks shall be per SSPWC-202-1.2.

2.3      SAND CEMENT SLURRY

A.         Sand cement slurry shall be 100-E-100 per SSPWC-201-1.1.2.

2.4 LOW DENSITY CELLULAR CONCRETE

A. Elastizell EF or equal.

PART 3 - EXECUTION

3.1       GENERAL

A.         The  Contractor  is  responsible  for  selection  of  methods  and  materials  to  be  used.
Abandonment's shall be shown in the construction schedule and coordinated with the sequence of construction.   Appropriate plugs shall be installed and approved by the Resident  Project  Representative.    Grout  shall  be  injected  in  an  upslope  manner  to remove trapped air.   Additional portals may need to be installed for proper venting or verification of the abandonment.  The Contractor shall accurately as built the materials used and limits of the abandonment on the record drawings.  The Contractor shall repair any linings damaged during the abandonment operations and inform the Resident Project Representative of any additional linings that require repair.  Lined manholes or structures where work occurred shall be spark tested to verify the existing lining is leak proof.