Maricopa Community Colleges  MEC109   20032-20086 
Official Course Description: MCCCD Approval: 11/26/02
MEC109 20032-20086 LEC 0.50 Credit(s) 0.50 Period(s)
Excavations
Excavation for underground piping systems including properties of specific soils, identification of specific soil types, hazards, abatement of hazards, Occupational Safety and Health Administration (OSHA) regulations, shoring, support systems and bedding material.
Prerequisites: Registered Apprentice status or permission of the apprenticeship coordinator.
Cross-References: ABA109
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MCCCD Official Course Competencies:
 
MEC109   20032-20086 Excavations
1. List and define trade terms relating to excavations and describe safety hazards associated with excavations. (I)
2. Describe the properties of soils according to grain size, soil gradation and grain shape. (II)
3. Identify soil types including sand, clay, silt and gravel. (III)
4. Describe OSHA safety regulations regarding trenching, specific hazards, personal safety equipment and sloping requirements for specific types of soil. (IV, V)
5. Identify specific shoring and support systems for trenches and excavations and describe their proper use. (VI)
6. Explain the use of bedding materials and apply these materials to specific trenching situations. (VII)
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MCCCD Official Course Outline:
 
MEC109   20032-20086 Excavations
    I. Excavations
        A. Trade terms
          1. Angle of repose
          2. Competent person
          3. Egress
          4. Sheet piling
          5. Shoring
          6. Silt
          7. Sloping
          8. Support system
          9. Trench box
          10. Other
        B. Safety concerns
      II. Properties of Soil
          A. Grain size
          B. Soil gradation
          C. Grain shape
        III. Types of Soils
            A. Sand
            B. Silt
            C. Clay
            D. Gravel
          IV. Excavation Safety
              A. Design hazards
              B. Personal safety
            V. Sloping Requirements
                A. Stable rock
                B. Type "A" soil
                C. Type "B" soil
                D. Type "C" soil
              VI. Excavation Support Systems
                  A. Shoring
                  B. Sheet piling
                  C. Trench boxes
                    1. Trench box configurations
                    2. Moving trench boxes
                    3. Trench box safety
                VII. Bedding Material
                    A. Laying conditions
                      1. Type 1
                      2. Type 2
                      3. Type 3
                      4. Type 4
                      5. Type 5
                    B. Maximum depth of cover
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