Pima County Community College District ("College") is seeking proposals from qualified firms to provide Chartered Ground Transportation Services. PROPOSAL SUBMISSION: An authorized agent of the Proposer must sign proposal.Pima County's Open and Closed Solicitations are posted below. Please register or login to see details of all open opportunities. The Contractor shall use the Adjustment Factors in effect on the date the Price Proposal is due, even though the Job Order may be issued after the.