The owner of organic grocer Chuck’s Produce & Street Market is moving forward with plans to build a second Clark County store while challenging the county’s assessment of nearly $850,000 in development fees. Company founder Bart Colson recently closed a $1.2 million deal to purchase a four-acre tract in Hazel Dell at the northeast corner of Highway 99 and 117th Street, where he proposes to build a 47,370-square-foot store, according to newly recorded county records. Colson, who complained last month about the $843,000 traffic impact fee the county initially assessed on his proposal, has submitted a separate study written by a company he hired to measure the store’s potential impact on traffic. That company’s analysis came in at roughly $424,000, about 50 percent less than the county’s total fee, based on a lower traffic projection than the county’sCounty engineers haven’t decided yet whether to accept that analysis or ask for additional information, said Jeff Mize, a spokesman for the county’s public works department. “We haven’t seen any immediate red flags and we remain optimistic about our ability to work with the applicant,” he said. Colson did not return messages. He expects the proposed $5.5 million Chuck’s Produce & Street Market store to open in mid 2012.The first Chuck’s opened in east Vancouver off Mill Plain Boulevard in 2010, transforming a shuttered Joe’s sporting goods store into a produce-focused grocery complete with an in-store deli, a bakery and butcher shop stocked with locally produced meats.