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(a) The number of control test piles to be driven at a foundation-site shall be determined by the structural engineer or architect by the degree of variation in soil conditions as indicated by the test borings at the site or other reliable information as described in Section 13-132-040.
(b) A pile to be tested shall be loaded to at least double the proposed allowable load, the load being applied in equal increments of not over 25 percent of the proposed allowable load. The proposed allowable load shall be reached in not less than eight hours, and shall be maintained until no measurable settlement is observed in a period of 16 hours. The total test load shall be reached in not less than eight hours after the first overload increment is applied, and shall be maintained until no measurable settlement is observed in a period of 16 hours.
(c) Measurements of the settlements shall be taken and recorded immediately before and after each increment of load is added. In determining the settlement, proper deduction shall be made for elastic compression of the pile under test load.
(d) The proposed allowable load shall be considered acceptable if the total net settlement under the total test load, after the elastic compression of the pile under the test load has been deducted, does not exceed 0.01 inch per ton of total test load.
(e) The proposed allowable load, if shown to be acceptable under Section 13-132-160(d), shall be allowable on all piles driven into the same soil conditions if the driving resistances are equal to or greater than that of the control test pile for the comparable driving distance, all other factors being equal.
(Prior code § 70-5.3)