GP72_Gavins_Point_Dam_Am_0001.pdf

GP72 Gavins Point Dam, Spillway Gates Nondestructive Testing

Amendment 0001

Specification Section 05 05 24 paragraph 1.2 TESTING PLAN after 4th sentence add, “The full length of each indicated weld shall be tested using phased array ultrasonic testing (PAUT). The PAUT plan shall include scans at multiple offsets as required to provide sound coverage of the weld and of the base metal extending for not less than 2 inches on each side of the weld. Additional scans shall be made as required to fully document the sizes and locations of all flaws in the weld and the base metal in the immediate vicinity of the weld.”

Specification Section 05 05 24 paragraph 3.7 Inspection Test Reports, note c, delete “Locations, dimensions, types and area of unacceptable defects and discontinuities shall be noted on a sketch or marked-up drawing”, and substitute, “Locations, dimensions, types and sizes that quantify all cracks, lack of fusion, incomplete penetration, slag inclusion, and other observed discontinuities shall be noted on a sketch representing the cross section at each weld containing the largest total area of discontinuities.

Provide sufficient information that the minimum cross sectional area of sound metal at the connection can be calculated.”

Specification Section 05 05 24 paragraph 3.7 Inspection Test Reports, add note “e. Scan images shall be encoded and stored digitally. The inspection report shall provide composite images of each scan to include all observed discontinuities.”

Specification Section 09 97 02 Paragraph 1.3 SUBMITTALS, in item SD-01 Preconstruction

Submittals add “Independent Painting Inspector; G-DO.”

Specification Section 09 97 02 paragraph 3.2.1 General, delete sentence, “The finished coating shall be free from holidays, pinholes, bubbles, runs, drops, ridges, waves, laps, excessive or unsightly brush marks, and variations in color, texture, and gloss,” and substitute, “Painting shall not commence until the independent third party inspector approves the surface preparation. The finished coating shall be tested and inspected to verify it is free from holidays, pinholes, bubbles, runs, drops, ridges, waves, laps, excessive or unsightly brush marks, and variations in color, texture, and gloss. The testing and inspection of all gates and of the finished coating is to be done by the approved third party independent test agency.

The field measurements and report shall be provided directly to the Contracting Officers Representative on site.”

Drawing sheet S-101. In ACCESS AND WORK SITE NOTES, Note 2, delete the second sentence, “If it becomes necessary . . . gates,” and substitute, “It is anticipated that the spillway gates on either side of the gate on which contractor is working will be partially opened to release water throughout the 2018 construction season. Water surface downstream of the gates is expected to remain below the curved concrete weir beneath the gates.”

Drawing sheet S-101. In ACCESS AND WORK SITE NOTES, add new note 7. “The contractor shall provide safe access for the Independent Painting Inspector and Government personnel to inspect all phases of the work.”

Drawing sheet S-101 ULTRASOUND INSPECTION NOTES. Delete note 2 in its entirety and substitute, “The contractor shall submit for approval a testing plan in accordance with Specification

Section 05 05 24.”

Drawing sheet S-101 ULTRASOUND INSPECTION NOTES in second sentence of Note 4 delete, “shall shall” and substitute “shall.”

Drawing sheet S-101 PAINT REMOVAL AND RECOATING NOTES, in Note 1 delete “extend” and substitute “extent.”

Drawing sheet S-102 Note 2. In third sentence delete “ERFORMED” and substitute “PERFORMED.”

Drawing sheet S-102 Section 1, in the note delete “TOPCOATON” and substitute “TOPCOAT.”