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a stone crushing in california

Stone crushingorsilica grindingthat is performed in connection with sand, gravel or clay digging shall be separately classified as 4000 (1), Sand or Gravel Digging, or 4000 (2),Clay Digging, if 25% or less of the excavated material is crushed or ground. If more than 25% of the excavated material is crushed or ground, all crushing and grinding activities shall be separately classified as 1710 or 1741 (1), Silica …

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