The city of La Center released a report Thursday detailing a private investigator’s conclusions about allegations of hostility and harassment among top city administrators.The investigation stemmed from a 37-page letter written in May by then-interim Police Chief Erin Nolan, who now works as a chief deputy for the Clark County Sheriff’s Office. In the document, Nolan relays numerous accusations of impropriety — including nepotism, cronyism, discrimination and intimidation — that she’d heard from city employees. Nolan sent the letter to Derek Bryan, a risk manager with the Association of Washington Cities. Bryan then commissioned Jim Webber, a private investigator from Kirkland, to look into the allegations. Webber wrapped up his investigation earlier this month, essentially exonerating everyone mentioned in Nolan’s letter and declining to draw conclusions about cases where he said he didn’t find enough evidence. He reached the findings following interviews with 19 current and former city employees, including Nolan, Mayor Jim Irish, Public Works Director Jeff Sarvis and Finance Director Suzanne Levis.Sarvis and Levis — who live together — found themselves at the center of much of the criticism in Nolan’s letter. According to the document, employees had concerns about the pair’s personal relationship and their influence over Irish.