Members of the Spokane Park Board questioned the ballooning cost of a Riverfront Park design contract this week, at one point coming close to stripping some projects from the work, including a promised skate park on the park’s north bank. The contract with the Seattle-based Berger Partnership, a landscape architecture and urban design firm, was originally limited to $1.5 million but the firm is now projecting more than $3.8 million in costs, prompting one park board member to warn the final contract cost is “going to be much higher than that.”