California Code, Public Resources Code - PRC § 3862

(a) Implement a zoning ordinance for areas containing methane gas hazards that establishes a methane gas hazard overlay and provides mandatory studies and mitigations for new construction within the overlay zones.

(b) Revise the safety element of the city or county general plan to illustrate the methane gas hazard areas and establish mitigative policies.

(c) Prepare a methane gas hazard mitigation plan, which provides strategies and mitigations for reducing existing methane gas hazards and for avoiding further hazards due to new construction.  The plans shall be consistent with the grant report, the zoning ordinance, and the general plan safety element.