Section 1568.4 - Blasting Prohibitions(a) When blasting is done in congested areas or in close proximity to a structure, railway, or highway, or any other installation that may be damaged, the blast shall be covered before firing with a mat constructed so that it is capable of preventing fragments from being thrown.(b) No person shall initiate blasting operations during that time of the year when burning permits are required (in the area of use) without having one of the following available for immediate use:(1) At least one back-pack type fire extinguisher of at least four (4) gallon capacity, or,(2) At least one round point shovel which has a minimum overall length of forty-six (46) inches.Cal. Code Regs. Tit. 19, § 1568.4