Final work must be approved by County Engineer prior to payment. Substructure Abutment (each) Cap Beam: W 36 x 130 with ¾ thick bearing plates. Piling: 10 ¾ OD pipe at 8 foot centers, and braced at 10-foot intervals above the ground. The cap beam may be reinforced over each pile with vertical stiffeners to increase resistance to web crippling, as shown in Attachment C. The piling should be driven in accordance with the Department Standard Specifications (Item 404- Driving Piling) explained in Attachment D. Each pile should attain bearing resistance of at least 150 kips, as determined by the hammer formula. Also, each pile should be driven through hard materials to a sufficient depth to eliminate the danger of failure due to scouring. In general, each pile should penetrate not less than 10 feet into hard material. Additionally, unless refusal is encountered, each pile should penetrate not less than 1/3 the unsupported length of the pile. Where the depth to dense material or rock is less than 10 feet, spread footing should be considered. These specifications may vary according to the Commissioner’s discretion. For technical assistance contact the Commissioner in whose Precinct the work is to be done
