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Additive Bid Item #1: Repair by welding up to 200 holes or corrosion damaged <br />areas up to 6" in diameter, after abrasive blast cleaning. Areas shall be repaired by <br />welding 1/4" steel plates to the tank per AWS D1.1. Blast and paint entire area <br />affected by repair according to the appropriate coating specification in this <br />document. Repairs shall be authorized by Engineer's Field Representative as <br />needed. Work shall be performed on a unit price basis. <br />5. PROTECTIVE COATING REPLACEMENT <br />All coating operations shall be performed in accordance with SSPC PA-1, SSPC PA-2, <br />AWWA D102 and these Specifications, including TS 2, 3, and 20 of the Technical <br />Specifications. <br />A. Interior Surface Preparation & Coating: <br />(1) The work covered by this part of the specification includes painting the <br />entire inside surface area of the tank, including the wet riser pipe. The <br />Contractor shall furnish all materials required for the painting and shall <br />install them in accordance with the manufacturer's written directions <br />and these specifications. <br />(2) Abrasive blast clean all areas below HWL in bowl to SSPC SP-6 <br />Commercial Blast Standard. A suitable angular anchor profile of at least <br />2.0 mils as determined by Test-Tex strips shall be established. All areas <br />shall be pressure washed with clean water per SSPC SP-1 prior to <br />blasting to prevent embedment of contaminants from existing coating. <br />(3) Remove all blast debris from tank and inspect the interior surface area <br />for pits and soluble salt contamination. Soluble iron salt concentration, <br />chloride concentration AND conductivity must be measured via test <br />strips and a conductivity meter in accordance with the manufacturer's <br />instructions. Submit testing method and equipment to Engineer for <br />approval. <br />(4) Repair deep pits by welding. Shallow pits shall be repaired with 100% <br />solids epoxy paste after zinc-rich primer is applied. <br />(5a) If soluble iron salt or chloride concentration is above 100 ppm, or <br />conductivity is above 30 µS/cm2, pressure wash per SSPC SP-1 all blast <br />cleaned areas to reduce soluble salt content to less than the above limits. <br />(Additive Bid Item #2). <br />SW - 6 <br />~ ~ 437 <br />