Borough of Dallastown, PA Conduit for Underground Utilities

Materials contaminated with gasoline, lubricating oil, liquid or gaseous fuel, aromatic compounds, paint solvents, paint thinner, or acid solder will be rejected.

(Reserved)

Job conditions: see Article VII.

Product delivery, storage and handling.

(1)

Delivery and handling.

(a)

During loading, transporting and unloading, exercise care to prevent damage to materials.

(b)

Do not drop pipe or fittings. Avoid shock or damage at all times.

(c)

Take measures to prevent damage to the exterior surface or internal lining of the pipe.

(2)

Storage.

(a)

Do not stack pipe higher than recommended by the pipe manufacturer.

(b)

Store PVC pipe and fittings in a cool, dry location out of direct sunlight and not in contact with petroleum products.

Excavation.

(1)

Depth of excavation.

(a)

Natural gas line.

[1]

Excavate main line trenches to a minimum depth of 36 inches. Grade for the invert of the conduit plus that excavation necessary for placement of bedding material. During street construction, prior to installation of the stone base course, conduits shall be installed at all proposed crossings. Conduits shall extend a minimum of two feet beyond the curbline where curbs are proposed or a minimum of five feet beyond the paving where no curbs are proposed to be installed.

[2]

Excavation for service lines shall be as nearly perpendicular to the street center line as possible and shall be a minimum of 24 inches deep plus that excavation necessary for placement of bedding material. A minimum of two service line conduits shall be placed for each lot which will require a street crossing, prior to installation of the stone base course. Location of the service line conduits shall be coordinated with the local gas supplier. With written authorization from the gas supplier, the number of conduits may be reduced to one. In any event, no open cut trenching for installation of gas services will be allowed after installation of the stone base course.

(b)

Electric conduits. Excavate main line trenches to a minimum depth of 24 inches plus that excavation necessary for placement of bedding material. During street construction and prior to installation of the stone base course, conduits shall be installed at all proposed crossings. Conduits shall extend a minimum of two feet beyond the curbline where curbs are proposed or a minimum of five feet beyond the paving where no curbs are proposed to be installed.

(c)

Telephone and cable TV. Excavate main line trenches to a minimum depth of 24 inches plus that excavation necessary for placement of pipe-bedding material. During street construction and prior to installation of the stone base course, conduits shall be installed at all proposed crossings. Conduit shall extend a minim of two feet beyond the curb line where curbs are proposed or a minimum of five feet beyond the paving where no curbs are proposed to be installed.

(2)

Where unsuitable bearing material is encountered in the trench bottom, continue excavation until the unsuitable material is removed, solid bearing is obtained or can be established, or concrete cradle can be placed. If no concrete cradle is to be installed, refill the trench bottom to required conduit grade, minus six inches for bedding, with Penn DOT 2RC aggregate.

(3)

Width of excavation. Excavate main line and service trenches to a maximum width of 24 inches.

(4)

Lay conduit to a true uniform line with a barrel of the conduit resting solidly in bedding material throughout its length. Excavate recesses in bedding material to accommodate joints. Do not subject the conduit to a blow or shock to achieve solid bearing or grade.

(5)

Lay section of conduit in such a manner as to form a closed concentric joint with the adjoining section and to avoid offsets in the conduit.

(6)

Clean and inspect each section of the conduit before joining. Assemble to provide tight, flexible joints that permit movement caused by expansion, contraction, and ground movement. If unusual joining resistance is encountered or if the conduit cannot be fully inserted into the bell, disassemble joint, inspect for damage, reclean joint components, and reassemble joint.

(7)

Assemble joints in accordance with recommendations of the manufacturer.

(a)

Solvent cemented joints.

(b)

Camfer and deburr conduit. Clean socket and plain end. Measure and mark the socket depth on the outside of the conduit.

(c)

Apply primer to inside socket surface using a scrubbing motion to ensure penetration. Repeated applications may be necessary. Soften surface of male end of conduit to depth of fitting socket by applying a liberal brush coat of primer. Do not pour primer on. Assure entire surface is well softened.

(d)

Repeat application of primer to inside socket surface, then apply cement to conduit while surfaces are still wet with primer. Apply cement uniformly taking care to keep excess cement out of socket.

(e)

Immediately after applying the last coat of cement to the conduit, and while both the inside socket surface and outside conduit surface are soft and wet, forcefully seat the conduit into the socket. Turn the conduit 1/4 turn during assembly to distribute the cement evenly. Assembly should be completed within 20 seconds after the last application of cement. Insert conduit with a steady, even motion. Do not use hammer blows.

(f)

Hold joint in place until cement has set. Wipe excess cement from the conduit.

(8)

Place sufficient compacted bedding and backfill on each section of conduit, as it is laid, to hold firmly in place.

(9)

Keep trenches and excavations free from water during construction.

(10)

When work is not in progress, at the end of each day, and at the end of each conduit run, securely plug open ends of conduit to prevent trench water, earth, and other substances from entering the conduit.

Conduit bedding and backfill.

(1)

All conduits must be surrounded with a minimum of six inches of stone dust (AASHTO #10) on top, bottom and each side.

(2)

For specific higher voltage lines, place six-inch concrete encasement as directed by the utility company.

Detectable warning tape for electric ant) natural gas conduits. The warning tape shall be installed 12 inches below the finished ground or street surface. Materials shall meet the requirements of U. S. Department of Transportation, Office of Pipeline Safety, code for pressure piping.