21—44.53 (200) New fertilizer or soil conditioner storage site location. New permanent storage sites as defined in rule 21—44.51(200) shall be selected in accordance with the requirements of the Iowa department of natural resources. The new site, if located in a floodplain, shall be protected from inundation from floods. New permanent fertilizer and soil conditioner storage sites shall be located at a minimum of 400 feet from public water supply wells or below ground level finished water storage facilities and a minimum of 150 feet from private water supply wells.