3.4 Protection of Property and Utilities

1. Locate and expose all existing underground structures and utilities as part of the trench or bore excavation.

2.2 Steel Casing Pipe

5. Casing pipe length shall conform to City of Meridian Standard Drawing SW1 “Casing Length Requirements.”

2.4 Carrier Pipe Skids

1. Calpico spacers shall be used except where an equivalent has been pre-approved by the City Engineer (see standard drawing SW2).

2.6 Annual Space Backfill

1. Backfill the void between the carrier pipe and the casing with clean sand free of deleterious material, or low strength foaming concrete grout/neat cement with a 7-day compressive strength of 60-70 psi, and a density of 35-38 lb/ft3 after foaming but prior to pumping. Annular space backfill may be deleted with the written approval of the City Engineer. Seal each end of casing with 3/8” neoprene seal with stainless steel bands. Refer to City of Meridian Standard Drawings SW1 and SW2.

3.1 General Requirements

1. Bore or jack, as necessary, at the locations indicated in the Contract Documents and staked in the field for the installation of pipelines, services, utilities, and ancillary items. Verify location and depth of all utilities.

3.5 Horizontal Directional Drilling Operation

2. Accurately survey the entire drill path with entry and exit stakes placed in the appropriate locations within the areas indicated on drawings. Using a magnetic guidance system survey, drill path for any surface geo-magnetic variations or anomalies. Verify location and depth of all utilities.

1.1 Section Includes

1. Pipe casing and sleeving requirements for pipe installation.
2. Annular space backfill requirements for casing or sleeving pipe installation.

1.2 Related Sections

1. Section 205 - Dwatering
2. Section 301 - Trench Excavation
3. Section 306 - Trench Backfill
4. Section 1103 - Construction Traffic Control

1.3 References

1. ASTM A 252: Standard Specifications for Welded and Seamless Steel Pipe Piles.
2. Manual on Uniform Traffic Control Devices, Latest Edition.

1.4 Submittals

1. Submit shop drawings of trench safety system for informational purposes only if excavation is over 4 feet deep.
2. Submit a traffic control plan if the operation will disrupt the normal flow of traffic in the work area, per Section 1103 – Construction Traffic Control.
3. Submit a dewatering plan if surface or groundwater are encountered, per Section 205 - Dewatering.

1.5 Field Measurements

1. Verify that survey benchmark and intended elevations for the work are as indicated in the Contract Documents.
2. Notify City Engineer if installation conditions such as soils or alignment do not match those contemplated in the Contract Documents. Allow one working day for Design Engineer to modify the design if necessary, unless otherwise specified.

1.6 Project Record Documents

1. Accurately record actual location of the carrier pipe and encountered utilities in relation to existing permanent benchmarks.
2. Provide copy of record documents to Owner prior to issuance of substantial completion.

2.1 General Requirements

1. Construction materials and equipment used for the work are to meet all requirements of the Contract Documents.
2. Use, handle, and store material in such a manner as to preserve quality and fitness for the work.
3. Immediately remove materials from the site of work that does not conform to the requirements of the Contract Documents as determined by the City Engineer or designee.

2.2 Steel Casing Pipe - Under Irrigation ditches, pipe, canals, roadways, or railroads

1. Conform to ASTM A252 with 3/8-inch minimum wall thickness.
2. Diameter a minimum of 2 inches larger than the outside bell diameter of the carrier pipe.
3. Casing to meet all superimposed loads, soil type conditions, and other conditions presented in the project.
4. Furnish pipe of sufficient thickness to withstand the forces exerted by the insertion operations.
5. Casing pipe length shall conform to City of Meridian Standard Drawing SW1 “Casing Length Requirements.”
6. See Standard Drawing SW2 for steel casing details

2.3 PVC Ppe Sleeving - DEQ Separation

1. PVC water class pipe DR25 or equal.
2. Diameter a minimum of 2 inches larger than the outside bell diameter of the carrier pipe.
3. Casing to meet all superimposed loads, soil type, conditions, and other conditions presented in the project.
4. Furnish pipe of sufficient thickness to withstand the forces exerted by the insertion operations.
5. See Standard Drawing SW2 for PVC sleeve details

2.4 Annualr Space Backfill when Carrier Pipes are Installed

• A. Backfill the void between the carrier pipe and the casing with clean sand free of deleterious material, or low strength foaming concrete grout/neat cement with a 7-day compressive strength of 60-70 psi, and a density of 35-38 lb/ft3 after foaming but prior to pumping. Seal each end of casing with 3/8” neoprene seal with stainless steel bands. Refer to City of Meridian Standard Drawings SW1 and SW2.
• C . Annular space backfill may be deleted with the written approval of the City Engineer. When a 20-foot PVC sleeve is used to meet DEQ separation requirements, and no ground water is anticipated, the annular space backfill may be deleted with approval of the Public Works Inspector.