![SAND, GRAVEL, AND CRUSHED STONE ONTHEJOB .](/e69yszg/733.jpg)
SAND, GRAVEL, AND CRUSHED STONE ONTHEJOB .
MODULE 17 PRIMARY CRUSHING OPERATION MODULE 18 OPERATING DRILLING EQUIPMENT ... A crushed stone plant differs somewhat from a sand and gravel plant. Raw material is ... safety precautions are omitted. Effective OJT should begin with an explanation (lecture and/or di scussi on) of the safe job pr ocedur e. ...