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Department of Transportation - Division of Maintenance Structure Maintenance & Investigations <br />INSPECTION COMMENTARY <br />SCOPE AND ACCESS <br />Middle River (Bacon Island Rd) County Bridge <br />Directions: South 15, west SR4, North on Bacon Island Rd. (37.956370,-121.526574) <br />Bridge upgrades just completed in May 2025. <br />EQUIPMENT INFORMATION <br />Incoming Main Voltage: 480V, 3-phase AC <br />Drive Motor <br />25 HP <br />230/460 V <br />64.8/32.4 A <br />1175 RPM <br />Eddy Current Clutch <br />Model # OAT 320250-4061 <br />50 RPM min 1090 RPM max <br />45 volt DC 7.04 Amps hot <br />Brake : 3.61 Amps hot <br />Wedge Hydraulic Pump Motor (North and South total 2) <br />1.5 HP <br />460 V <br />2.02 A <br />1775 RPM, 0.79 P.F. <br />Hydraulic Motor (East and West) <br />10 HP <br />460 V <br />12.2 A <br />1760 RPM, 0.84 P.F. <br />Motors feeder main voltage measured before operation : 481 V <br />Insulation Resistance Readings measured before operation: <br />Drive Motor 200+ MOhms <br />South Wedge Motor 200+ MOhms <br />North Wedge Motor 200+ M Ohms <br />West Hydrualic Motor 200+ MOhms <br />East Hydraulic Motor 200+ MOhms <br />Machinery Brake 10.5 MOhms <br />Current readings measured during operation: <br />Drive Motor: Acceleration 18 - 22 amps <br />Coasting 15.8 amps <br />Eddy Current Clutch : Acceleration 1.5 - 2.0 amps DC <br />End of travel to Close 1 -2 amps DC <br />Brake: Slow down 1-2 amps DC <br />Full open stop spiked to 2.0 amps DC <br />South Wedge Motor 1.7 amps (pull) 1.7 amps (drive) <br />North Wedge Motor 1.9 amps (pull) 2.0 amps (drive) <br />West Hydrualic Motor 7.0 amps <br />East Hydraulic Motor 7.0 amps <br />Machinery Brake 0.4 amps <br />PERSONNELPRESENT <br />Chris Jurado Bridge Operator <br />Mike Shelton Bridge Maintenance <br />County Contact: <br />Jeff Verstl jverstl@sjgov.org (209) 953-7600 <br />Bridge Engineering Division <br />Public Works Department <br />San Joaquin County <br />(209) 953-7600 <br />Printed on: Monday 06/23/2025 03:39 PM Page 4 of 9 29C0108/AABG/154008 <br />