Hello, I am trying to find out the issues for the below problem, but I am not sure that should I address the issue of how Robert Taggart was awarded the contract from Douglas County after they withdrew the bid?

Can you please help?

Thanks,

Douglas County sought bids for a construction project. Robert Taggart wanted to submit a bid but knew the project needed rock. He talked with one of the owner of a rock source and was told the rock was for sale but the price could not be determined until the other owner was consulted. Taggart prepared an incomplete bid, told his bookkeeper to get the rock price and complete the bid. Taggart left on vacation. The bookkeeper did so and submitted the bid. The bids were opened. Taggart's bid was the lowest, but it was learned later that day that the rock was no longer for sale. The next day the bookkeeper delivered a written bid withdrawal to the county. The county subsequently awarded the contract to Taggard. Is there a contract and why?