Home Premium Content Test borings to gauge Tappan Zee support needs Premium ContentTransportationWestchester Test borings to gauge Tappan Zee support needs By Bill Fallon - March 25, 2013 Tappan Zee Constructors L.L.C. began preconstruction geotechnical surveys on March 25 to determine soil conditions beneath the riverbed. This content is for Westfair Online members only. Please Sign in / Join to view this content. Become a member by Registering Here.