Cal. Civ. Proc. Code § 1299.6

(a) The arbitration panel shall direct that five days prior to the commencement of its hearings, each of the parties shall submit the last best offer of settlement as to each of the issues within the scope of arbitration, as defined in this title, made in bargaining as a proposal or counterproposal and not previously agreed to by the parties prior to any arbitration request made pursuant to subdivision (a) of Section 1299.4. The arbitration panel, within 30 days after the conclusion of the hearing, or any additional period to which the parties agree, shall separately decide on each of the disputed issues submitted by selecting, without modification, the last best offer that most nearly complies with the applicable factors described in subdivision (c). This subdivision shall be applicable except as otherwise provided in subdivision (b).
(b) Notwithstanding the terms of subdivision (a), the parties by mutual agreement may elect to submit as a package the last best offer of settlement made in bargaining as a proposal or counterproposal on those issues within the scope of arbitration, as defined in this title, not previously agreed to by the parties prior to any arbitration request made pursuant to subdivision (a) of Section 1299.4. The arbitration panel, within 30 days after the conclusion of the hearing, or any additional period to which the parties agree, shall decide on the disputed issues submitted by selecting, without modification, the last best offer package that most nearly complies with the applicable factors described in subdivision (c).
(c) The arbitration panel, unless otherwise agreed to by the parties, shall limit its findings to issues within the scope of arbitration and shall base its findings, opinions, and decisions upon those factors traditionally taken into consideration in the determination of those matters within the scope of arbitration, including but not limited to the following factors, as applicable:
1. (1) The stipulations of the parties.
2. (2) The interest and welfare of the public.
3. (3) The financial condition of the employer and its ability to meet the costs of the award.
4. (4) The availability and sources of funds to defray the cost of any changes in matters within the scope of arbitration.
5. (5) Comparison of matters within the scope of arbitration of other employees performing similar services in corresponding fire or law enforcement employment.
6. (6) The average consumer prices for goods and services, commonly known as the Consumer Price Index.
7. (7) The peculiarity of requirements of employment, including, but not limited to, mental, physical, and educational qualifications; job training and skills; and hazards of employment.
8. (8) Changes in any of the foregoing that are traditionally taken into consideration in the determination of matters within the scope of arbitration.