At the posted coordinates, you will find a plaque dedicating this bridge to Arianna Celeste Macnamara. To find the final:
Year of Birth = ABCD
Year of Death = EFGH
Year of Dedication = IJKL
Search for a micro container at: N (I*2)(E*2) J(H/2).EGD W FBI EC.HHE
You may need a TOTT for retrieval.
You can validate your puzzle solution with
certitude.