Register on Cal eProcure as a Sourcing Bidder and create a business profile that reflects your firm's essential capabilities through keywords and UNSPSC codes. "Construction contract" means and includes a contract, whether on a lump sum, time and material, cost plus, or other basis, to: 1.Contractors performing public works must register and meet requirements using the online application before bidding on public works contracts in California. This contract aims to ensure the proper functioning of irrigation systems within Caltrans District 12. Pricing irrigation jobs is a tricky science, one that can leave contractors all wet if it's not applied accurately. Customers list about 400 - 300 active.