Labor Code §6705 adds a California requirement on top of the Construction Safety Orders. When does it apply?

Explanation

Section 6705 requires every contract for public works in excess of $25,000 involving an excavation five feet or deeper to carry a clause obliging the contractor, before excavation begins, to submit a detailed plan showing the design of shoring, bracing, sloping or other provisions to protect workers from caving ground - and if that plan varies from the shoring system standards, it must be prepared by a registered civil or structural engineer. No plan may permit protection less effective than the Construction Safety Orders require. All three limbs matter, and each wrong answer drops one: (a) and (b) drop the public works contract and its dollar threshold, and (c) substitutes the 20-foot figure from Appendix B, which is a Title 8 design rule and not part of §6705 at all.