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(a) Continuous full-time inspection of all phases of caisson construction shall be provided. Each caisson shall be inspected by an experienced inspector. The inspector shall be an employee of the structural engineer or architect who prepared and sealed the design plans, or an employee of a firm engaged in soil and foundation engineering, approved by the structural engineer or architect.
(b) Complete construction records shall be maintained showing all significant information relative to installation. These reports, signed by the inspector and the structural engineer or architect, shall be submitted to the building commissioner.
(c) When caissons are installed through clay or hardpan, the design bearing pressure shall be confirmed by tests made below the individual caissons, as directed by the structural engineer or architect.
(d) Where caissons are installed to bear on solid rock, the bottom of caisson excavations shall be probed or drilled to a depth as directed by the structural engineer or architect to detect the possible presence of weak zones.
(e) Where water cannot be removed from caisson excavation and water is permitted to rise in the caisson and concrete is placed under water, the structural engineer or architect shall require either core borings or other accepted method of exploration to insure that a satisfactory caisson has been constructed.
(Prior code § 70-12.4; Amend Coun. J. 9-13-89, p. 4604; Amend Coun. J. 3-5-03, p. 104990, § 30; Amend Coun. J. 11-13-07, p. 14999, Art. II, § 1)