Report (698) 134 Pam Oo) r
Structural Observations Report
Final Inspection of Structural Work
Project: Durham WWTP Crystallizer Installation
Structure Name: Influent Pump Station
Observation Performed By: Matthew Smith /CH2M HILL
Date of Visit: April 1, 2009
Report Summary:
On Wednesday, April 1, 2009, the final inspection of the Durham WWTP structural work
was performed. With the exception of the final paint finishes, the structural work appeared
complete and matched the structural drawings. Only work relating to the CH2M HILL
contract was inspected and systems designed by others were not reviewed. The following
outlines the structural observations:
Highlights:
Doorway Support Column:
During the course of the reactor installation, the HSS column supporting the doorway skin
framing and hoist beam was removed and reattached. (Reference RFI M -013) The final
condition of the column could not be verified because at the time of the visit, the skin
framing was back in place. However, after review of photographs taken by the client and
contractor as well as the visual inspection report of Carlson Testing, it appears that the
column was adequately welded back into position. See attached photo, PL -1.
Reactor Frames:
All three OSTARA reactors were in place and filed to standard operating levels. The
connections appeared to match the contract drawings and the welds on the modified brace
connections appeared adequate except that the final finish had not been applied. The grout
bearing pads looked to be adequately formed and the frames seemed level. The modified
Reactor /Frame connections were installed, but some were not painted. See attached photos,
PL -2.
Steel Floor Beam:
The steel floor beam supporting the control room structural slab appeared complete. The
anchor bolts matched the structural drawings and the grout appeared to be in place. See
attached photos, PL -3.
Concrete Opening Infill:
The concrete infill repairs of the openings in the Motor Room slab were complete. The finish
nearly matched the existing slabs. Several pop outs were visible from underneath, but the
structural integrity does not appear to be impacted. It was noticed that some of the form
holes were not completely filled with grout. See attached photos, PL -4.
Steel Column:
The steel column located in the pump room was in place. The grout bearing pad appeared
to be properly formed and the anchors bolts properly positioned. See attached photos, PL -5.