I have submitted the following designs for your review. I understand the connection between the bridge and what your company does, but I opted for a more abstract interpretation. I felt that an obvious bridge (GG or Zakim Bunker Hill) gave your company more of a "civil engineering company" feel, rather than a bioconsultant. I chose to bridge molecules in order to tie the meaning of the logo to your field.
I also gave you a few color options (no Cal Berkeley colors - lol). We lived 6 years in Escondido Village while my folks studied at Stanford U.) On #95, #96 and #97 I went with all Stanford color palettes. Your feedback would be greatly appreciated. Feel free to request any revisions.