A coalition of environmental groups has issued a letter to the county demanding additional mitigation measures for the North McKay Ranch subdivision, a large-scale mixed-use development approved by the Humboldt County Board of Supervisors last month.The organizations say that by approving the project’s Final Environmental Impact Report (FEIR), the county violated state environmental law by failing to adequately analyze project impacts and refusing to require the developer, Kurt Kramer, to implement feasible mitigation measures such as all-electric new construction.