Permits & Development - Encroachment(EP)/Driveway(DW) Permits - 2007_EP-07-301 thru EP-07-400_ - EP-07-352

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C. Drilled holes filled with concrete. D. Rock sockets filled with concrete. • The drilling of holes shall conform to the provisions in these specifications. Concrete filling for cast-in-place concrete piles is designated by compressive strength and shall have a minimum 28-day compressive strength of 25 MPa. At the option of the Contractor,the combined aggregate grading for the concrete shall be either the 25-mm maximum grading, the 12.5-mm maximum grading,or the 9.5-mm maximum grading. Concrete shall conform to the provisions in Section 90, "Portland Cement Concrete," and Section 51, "Concrete Structures." Reinforcement shall conform to the provisions in Section 52,"Reinforcement." The fourth paragraph in Section 49-4.03,"Drilled Holes,"of the Standard Specifications is amended to read: • After placing reinforcement and prior to placing concrete in the drilled hole, if caving occurs or deteriorated foundation material accumulates on the bottom of the hole,the bottom of the drilled hole shall be cleaned. The Contractor shall verify that the bottom of the drilled hole is clean. The first and second paragraphs in Section 49-4.04,"Steel Shells,"of the Standard Specifications are amended to read: • Steel shells shall be sufficiently watertight to exclude water during the placing of concrete. The shells may be cylindrical or tapered,step-tapered,or a combination of either,with cylindrical sections. The first paragraph in Section 494.05,"Inspection,"of the Standard Specifications is amended to read: • After being driven and prior to placing reinforcement and concrete therein, the steel shells shall be examined for collapse or reduced diameter at any point. Any shell which is improperly driven or broken or shows partial collapse to such an extent as to materially decrease its nominal resistance will be rejected. Rejected shells shall be removed and replaced,or a new shell shall be driven adjacent to the rejected shell. Rejected shells which cannot be removed shall be filled with concrete by the Contractor at the Contractor's expense. When a new shell is driven to replace a rejected shell,the Contractor, at the Contractor's expense,shall enlarge the footing as determined necessary by the Engineer. The third paragraph in Section 49-5.01,"Description,"of the Standard Specifications is amended to read: • Steel pipe piles shall conform to the following requirements: 1. Steel pipe piles less than 360 mm in diameter shall conform to the requirements in ASTM Designation: A 252, Grade 2 or 3. 2. Steel pipe piles 360 mm and greater in diameter shall conform to the requirements in ASTM Designation: A 252,Grade 3. 3. Steel pipe piles shall be of the nominal diameter and nominal wall thickness shown on the plans or specified in the special provisions. 4. The carbon equivalency (CE) of steel for steel pipe piles, as defined in AWS D 1.1, Section 3a5.1, shall not exceed 0.45. 5. The sulfur content of steel for steel pipe piles shall not exceed 0.05-percent. 6. Seams in steel pipe piles shall be complete penetration welds. The first paragraph in Section 49-6.01,"Measurement,"of the Standard Specifications is amended to read: • The length of timber, steel, and precast prestressed concrete piles, and of cast-in-place concrete piles consisting of driven shells filled with concrete,shall be the greater of the following: A. The total length in place in the completed work,measured along the longest side,from the tip of the pile to the plane of pile cut-off. B. The length measured along the longest side,from the tip elevation shown on the plans or the tip elevation ordered by the Engineer,to the plane of pile cut-off. The third paragraph in Section 49-6.02,"Payment,"of the Standard Specifications is amended to read: Contract No. 10-OM7104 24 �r�wn