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Excavation
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Introduction Review online course content. Review questions.
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Workshop Objectives Participate in discussions, demonstrations, and hands-on activities that will enable you to: Discuss how damage prevention programs, best practices, techniques, excavation standards, and inspection requirements used by qualified personnel. Apply One-Call notification procedures, OSHA requirements, and best practices as needed on the job. Explain how and why to monitor an area for settlement during and after excavation activities. Verify system integrity during and after excavation activities. Recognize and react to abnormal operating conditions.
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Excavation Requirements
Best practices and required safety tasks required by OSHA and CGA (Common Ground Alliance) Excavation Points One-Call Center Positive/verified locates Activity Worksheet #1
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Excavation Hazards Key points about excavation hazards
Locating buried facilities Shock hazards Cave-ins Diverting water from excavation site Activity Worksheet #2
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Excavation Hazards Locating and Marking Facilities
Establishing excavation points How to: White line an excavation Locate and mark buried utilities with color codes Activity Worksheet #3 Activity Worksheet #4 Image Retrieved July 2013
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Damage Prevention How to prevent damage during excavation by using:
Best safety practices Monitoring excavation activities Complete and proper documentation System patrols Proper and frequent inspections Activity Worksheets #5, #6, #7
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SOIL Soils used to backfill Testing soil Unified Soil Classification
Backfilling using appropriate tools and restoring the property Activity Worksheet #8
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Trench Preparation Trench width and depth requirements
Buried main location Guidelines for service main installation Covering a buried pipe the right way Trench padding Cathodic protection system Activity worksheet #9 Image Retrieved July
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Backfill Process External load of backfill Pipe installation
Degree of compaction Types of backfill used Following engineering specifications Site restoration Activity worksheet # 10 Image Retrieved July Caption: “The finely ground spoil encases the pipe when backfilling. This reduces subsidence when compared to excavators.”
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Compaction Compaction process and requirements Affecting factors
Field density tests Sand cone Rubber balloon Nuclear gauge Soil compaction meter Activity worksheet #11 Image Retrieved July
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Sources Occupational Safety and Health Administration (OSHA)
Compressed Gas Association (CGA) US Department of Transportation (FHWA) Proctor Test (adopted by the American Association of State Highway and Transportation Officials [AASHTO]).
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Code of Federal Regulations
§ Cover. § Service lines: Installation. § Cover over buried pipeline § Damage prevention program. § Damage prevention program. § Pipeline integrity management in high consequence areas. § Scope, application, and definitions applicable to open excavations. § Specific excavation requirements. § Requirements for protective systems. § General. § Transmission lines: Leakage surveys. § Distribution systems: Patrolling. § Distribution systems: Leakage surveys. § What additional preventive and mitigative measures must an operator take? Proctor Test (adopted by the American Association of State Highway and Transportation Officials [AASHTO]).
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Open Discussion Questions Comments
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