Oakland under its current or any past name in the past five years? All businesses that want to contract with the City must register with iSupplier, to receive bid notifications, to apply for local business certification.Was this page helpful? SECTION 00 10 00 INVITATION TO BID Sealed Proposals for the construction of "2023 Water System Improvements, SRF Project No. Bids will be opened at or after the time indicated for receipt of bids as indicated in the Invitation to Bid. 5. Free fillable forms: City of Oakland. Non-Federal Agency (CA) Sign up.