sand, gravel, and crushed stone on-the-job training modulesother dangers that are particular to sand and gravel, and to crushed stone . must examine their working places before starting work, and frequently thereafter.sand gravel labor,sand gravel labor,ITEM 70 RIPRAP PART 1 – GENERAL 1.01 SCOPE A. The work .sacked sand-cement riprap as shown on the Drawings and/or specified herein. . and gravel, or an approved filter fabric shall be placed under the riprap.Labor Requirements: Sand and Gravel and Ready-Mixed . - Jstorseries concerning labor requirements in the production of certain basic build- . 61 sand and gravel plants and 21 ready-mixed concrete plants accounting for.
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