Top Guard Truncated Domes for FDOT T2531 in Lake City (Columbia County) November 16, 2015 emunoz Posted by emunoz on November 16, 2015June 6, 2017 Top Guard yellow detectable warnings installed +/-16 locations (+/-190 sq.ft.) along US 90 in Lake City (Columbia County). FDOT contract T2531. Anderson Columbia as prime.