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Department of Transportation - Division of Maintenance <br />Structure Maintenance & Investigations <br />INSPECTION COMMENTARY <br />SCOPE AND ACCESS <br />A non -redundant steel tension member (NSTM) inspection was performed on 05/01/2025 by Lkhagvasuren Batbaatar and Allan Lee from <br />the Office of Specialty Investigations. <br />The structure was accessed with the A62T UBIT operated by Stephen Teesdale and with a lift truck. Lane closures and traffic control <br />were provided by San Joaquin County. <br />The interval of the NSTM inspection exceeded 24 months due to UBIT schedule and lane closure schedule. <br />The investigation was conducted in accordance with the Fracture Critical Member Inspection Plan, dated 04/17/2013. <br />NON -REDUNDANT STEEL TENSION MEMBER INSPECTION <br />A hands-on visual inspection was performed on: (i) the tension members of the left and right steel trusses including the steel gusset <br />plates in Span 31, (ii) the steel floor beams in Span 31. No fractures or cracks were found. <br />There is damage in the vertical member, L2-U2, of the right truss as a result of high load hit. See photo 4. <br />Minor pack rust was noted at the gusset plates of the lower chord members of the truss. <br />These defects will continue to be monitored in future NTSM inspections. <br />STEEL INVESTIGATION DETAILS <br />This structure qualifies for an in-depth Steel investigation because it possesses the following non -redundant steel tension members <br />(NSTM) or fatigue prone details <br />Floor Beams: NSTM, <br />Truss: NSTM <br />NSTMI Required Yes Last NSTMI 05/01/2025 NSTMI Freq. 24 months Next NSTM Inspection 05/01/2027 <br />STEEL ELEMENT NDT INSPECTION <br />Span <br />Girder Bay <br />Element <br />Method <br />Inspection Result <br />31 <br />L PP L2 <br />SGP <br />VT <br />Minor pack rust evident at interface of gusset plate and lower chord member <br />31 <br />L PP L1 <br />SGP <br />VT <br />Minor pack rust evident at interface of gusset plate and lower chord member <br />31 <br />RT <br />L2-U2 <br />VT <br />Damage in the vertical member due to high load hit <br />LEGEND: <br />L = Left <br />RT = Right Truss <br />PP = Panel Point <br />L = Lower Chord <br />SGP = Steel Gusset Plate <br />VT = Visual Testing <br />UNDERWATER INVESTIGATION DETAILS - NOT APPLICABLE FOR THIS BRIDGE. <br />Printed on: Tuesday 06/10/2025 03:00 PM Page 29C0037/AABB/152574 <br />