California Code, Health and Safety Code - HSC § 33455

After receiving the recommendation of the agency concerning such changes in the plan, the legislative body upon further recommendation by the agency, without additional agency public hearing, may make further changes, including changes in area or boundaries to exclude land from the project area, for consideration at the public hearing. If such changes are substantial changes in the plan which affect the master or community plan adopted by the planning commission or the legislative body, such changes shall be submitted to the planning commission for its report and recommendation to the legislative body within 30 days after such submission. If the planning commission does not report upon the changes within 30 days after its submission by the legislative body, the planning commission shall be deemed to have waived its report and recommendation concerning the changes. If after the public hearing the legislative body determines that the amendments in the plan, proposed by the agency, or the further recommended changes by the agency are necessary or desirable, the legislative body shall adopt an ordinance amending the ordinance adopting the plans thus amended. The legislative body shall consider any proposed changes at a public hearing reopened for that limited purpose.