Plans to restore four municipally owned brownfields properties and put them to better use – as well as back on the tax rolls – are advancing thanks to a $1 million federal grant.The four properties – the 2.5-acre former hat factory site, the 2.2-acre former high school grounds, the 115-acre former landfill and the 658-acre airport – total nearly 780 acres. Brownfields are sites that have suffered contamination.