All departments, agencies, units, instrumentalities, and political subdivisions of the state shall cooperate with the Ohio history connection and the Ohio historic site preservation advisory board in the preservation of archaeological and historic sites and in recovery of scientific information from such sites, and for such purposes shall, whenever practical, by contract or otherwise provide for archaeological and historic survey and salvage work during the planning phases, before work on a public improvement begins or at other appropriate times; and require that contractors performing work on public improvements cooperate with archaeological and historic survey and salvage efforts and notify the Ohio history connection or the board about archaeological discoveries. The director of the Ohio history connection shall determine the disposition of artifacts and skeletal remains discovered on state lands.