Edition 57 // November 2019 Tech Tips by NAsscO is A bi-mONThly ArTicle ON TreNds, besT prAcTices ANd iNdusTry Advice frOm NAsscO's TreNchless TechNOlOgy membership prOfessiONAls. Safety'S MoSt Vulnerable eMployeeS: new and experienced By NASSCO Board Member Frank A. Kendrix, Senior Project Manager, Insituform Technologies, LLC