The city finance department shall refer all applications for operator's permits and vendor's permits made pursuant to this chapter to the Los Angeles County sheriff's department for investigation and recommendation. The sheriff's department shall have a reasonable period of time within which to investigate the application and background of the applicant for a vendor's permit or an operator's permit. The sheriff's department shall, within thirty days after the date of the filing of the application, render a written recommendation to the city finance department as to approval or denial of the application for the permit based upon the criteria set forth in Section 10.30.080. (Ord. 797-95 § 1 (part))