Bids for a new concession stand at Hall Park will be opened today. The plans Riverside’s architect and engineer put together call for a building that will house concessions and handicap accessible bathrooms. City Administrator Rusty Rogerson says he and the engineer will study the bids, and make a recommendation at a public hearing before Monday’s council meeting.  There are concerns the bids will come in over budget, meaning the existing plans would have to be adjusted to bring down the cost.