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I 1 Item 24 - SPECIFICATION 31 61 00, DRILLED MICROPILES, Page 6, Section 3.03. Section 3.03 is REVISED as follows: 3.03 VERIFICATION AND PROOF TESTS A. Perform TENSION verification and proof testing of piles as described below and shown on the Drawings. Perform comprnscion load tooting accordanc ith �.y � uvvv��awwt.w�[rr ASTM D1113 and tension load testing in accord with�ASTM D3689, except as modified herein. B. Perform pre-production verification pile load test to verify the design of the pile system and the construction methods proposed prior to installing any production piles. The verification pile shall be located in the area of close proximity to the PUMP BUILDING,digester as and at a location approved by the Engineer. The sacrificial verification test pile shall be constructed in conformance with the approved Contractor Design Drawings. C. Verification load test(s) shall be performed to verify that the Contractor installed micropiles will meet the compression and/or tensile load capacities and load test acceptance criteria and to verify the length of the micropile load transfer bond zone is adequate. The micropile verification load test results must verify the Contractor's design and installation methods. The drilling methods and pile assembly shall be the same as the production piles. ' D. Testing equipment shall include dial gauges, dial gauge independent reference frame, jack and pressure gauge, electronic load cell (with readout device), and a reaction frame. The load cell is required only for the creep test portion of the verification test. The contractor shall provide a description of test setup and jack, pressure gauge and load cell calibration curves in accordance with Section 01300 - Project Data Submittals. E. The test load shall be applied in increments of 25 percent of the DL load. Each load increment shall be held for a minimum of 1 minute. Pile top movement shall be measured at each load increment. The load-hold period shall start as soon as each test load increment is applied. The verification test pile shall be monitored for creep at the 1.33 Design Load (DL). Pile movement during the creep test shall be measured and recorded at 1, 2, 3, 4, 5, 6, 10, 20, 30, 50, and 60 minutes. The alignment load shall not exceed 5 percent of the DL load. Dial gauges shall be reset to zero after the initial AL is applied. F. The acceptance criteria for micropile verification load test are: 1. The Engineer shall determine the criteria for tolerable movement during the load test at the top of the micropile. 2. At the end of the 1.33 DL creep test load increment, test piles shall have a creep rate not exceeding 0.05 0.04 inch/log cycle time (1 to 10 minutes) or 0.1 inch/log cycle time (6 to 60 minutes or the last log cycle if held Addendum 3 to Evergreen Pump Station Modifications(WO#UP3747-3) Page 9/17 CITY OF EVERETT • 3200 Cedar Street • Everett, WA 98201 • (425)257-8800 • Fax(425)257-8882