NOTE: Mandatory bidders facility tour on April 8, 2008 at 9:00 AM. See main page for Addenda 1-4. Contractor to: Replace settled gas header piping, replace vault boxes, replace wellheads, install sample ports and thermometers at the wellheads, provide new trench riser assembly valves and sampling risers, and perform all resulting excavation, backfill and surface cover repair. Remove and replace the utility flare wind shroud.