Trinity Contractors, Inc 3/1/2017

1 1 2 6. Reinforcing steel placement shall meet the tolerances specified in Section 6- 3 02.3(24)C. 1 4 5 This section is supplemented with the following new subsection: 6 7 7-02.3(6)A5 Wingwalls and Retaining Walls 8 Wingwalls and retaining walls (including cutoff walls and headwalls) shall be 9 constructed in accordance with the Contractor's design and Working Drawing submittal 10 or when the Plans include a complete set of design details for a wall (defining panel 11 shapes and dimensions, concrete strength requirements, and steel reinforcing bar, joint, 12 and connection details),the details shown in the Plans. 13 14 Precast concrete construction shall conform to Sections 6-02.3(28) and 6-11.3(3). 15 16 Culvert bedding material shall be furnished, placed, and compacted in accordance with 17 Section 7-02.3(6)A4. 18 19 7-02.3(6)A1 Design Criteria ' 20 The first sentence of the last paragraph is revised to read: 21 22 Whenever the minimum finished backfill or surfacing depth above the top of the , 23 Structure is less than 1'-0" (except when the top of the Structure is directly exposed to 24 vehicular traffic), either all steel reinforcing bars in the span unit shall be epoxy-coated 25 with 2" minimum concrete cover from the face of concrete to the face of the top mat of 26 steel reinforcing bars, or the minimum concrete cover shall be 21/2". 27 28 The last sentence of the last paragraph is revised to read: 29 30 Concrete cover from the face of any concrete surface to the face of any steel 31 reinforcement shall be 1-inch minimum end clearance at all joints, and 2-inches 32 minimum at all other locations. 33 34 7-02.3(6)A2 Submittals 35 The first paragraph is revised to read: 36 37 The Contractor shall submit shop drawings of the precast Structures. Fabrication shop 38 drawings replicating complete design details when shown in the Plans shall be Type 2 39 Working Drawings. Submittals completing the design based on the schematic 40 geometric requirements shown in the Plans, or proposing a Contractor designed 41 alternative concrete culvert Structure shall be Type 2E Working Drawings with 42 supporting design calculations. 43 44 The last paragraph is revised to read: 45 46 For precast Structures with a span length greater than 20-feet (as defined in Section 7- 47 02.3(6)A1), except when the depth of fill above the top of culvert exceeds the Structure 48 span length, a Type 2E Working Drawing shall be submitted consisting of a load rating 49 report prepared in accordance with the AASHTO Manual for Bridge Evaluation and 50 WSDOT Bridge Design Manual LRFD M 23-50 Chapter 13. Soil pressures used shall 51 include effects from the backfill material and compaction methods, and shall be in I AMENDMENTS TO THE 2016 STANDARD SPECIFICATIONS BOOK Revised: 8/1/16