Are bid documents, including the documents submitted by the bidders and any evaluation forms or notes used in evaluating the bids, public records which must be released to anyone who requests them?
Once the district has opened bids and issued an intent to award to a particular bidder the bid documents are open for public inspection. There is a limit to this. Information which would be a trade secret, or otherwise fit an exception for public disclosure can be redacted (removed with white out).
Ask the bidders what information in their bid documents they consider a trade secret. Have them reply in writing. Use that information to determine what you white out before the documents are released. If they say ‘everything’ then you should have an attorney review the documents because redacting everything will be challenged. Release what you can to the party making the request. If the requestor feels they should be able to see more information, they can appeal to the district attorney. A district attorney will review the request and may order you to release additional information.