Chapter 3.60 PURCHASING 3.60.010 PURPOSE. 3.60.020 AUTHORITY. 3.60.030 BIDS AND SPECIFICATIONS. 3.60.040 AWARD PROCEDURES. 3.60.050 EXCEPTIONS. 3.60.055 SUBSTITUTION OF SUBCONTRACTORS. 3.60.060 PREQUALIFICATION OF BIDDERS. 3.60.065 APPEAL FROM DENIAL OF PREQUALIFICATION. 3.60.070 AUTHORIZED PURCHASING ALTERNATIVES. 3.60.080 LIABILITY. 3.60.090 QUARTERLY REPORT TO CITY COUNCIL.