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6 <br />3.0 RECOMMENDATIONS <br />The photographs referred to in this section are in Appendix A. All drawings are found in <br />Appendix B. The surface preparation requirements for all repairs as well as the <br />requirements for welding are described in Appendix C. The exterior and interior paint <br />chip lead tests are in Appendix D. <br />Based on an evaluation of the inspection data, the recommendations are: <br />3.1 Interior Wet Structural <br />3.1.1 Seal weld the interiors of the following joints: <br />a. between the roof plate and the 30 -inch diameter access manway; <br />b. between the roof plate and the 24 -inch diameter ventilation manway; <br />c. between the roof and the 48 -inch diameter drywell tube; <br />d. the inside of the dollar plate butt joints, and; <br />e. the overlapped dollar plate to roof plate seam. <br />These welds will prevent rust streaking and corrosion in areas <br />inaccessible to paint. See photos 2 through 8. <br />3.1.2 Remove the four painters' rigging pipe couplings in the roof and install <br />cover plates over the resultant holes, seal welded on both the interior and <br />exterior. See photo 6. <br />3.1.3 Seal weld all bolted roof -framing connections at the center compression <br />ring with 1/4 -inch fillet weld. After welding, remove all nuts and bolts. <br />This will conform to AWWA D100-11. See photos 2, 7 and 8. <br />3.1.4 Seal weld all unwelded connections of the 42 roof rafters to the shell rim <br />angle. The corrosion that is coming from these connections on the have <br />incomplete welds. Sealing weld these seams will prevent rust streaking <br />and corrosion and will conform to AWWA D100-11. See photos 11 and <br />12. <br />3.1.5 There is an annular space between the shell rim angle and roof plate <br />which is very difficult to abrasive blast and paint, leading to the <br />corrosion and rust streaking shown in photos 11 and 12. Caulk this <br />annular space with urethane caulk after painting to eliminate corrosion <br />and rust bleeding. <br />3.1.6 Install two (2) interior painter's rails to improve rigging for the roof and <br />shell areas of the tower. Install one painters' rail on the roof near the <br />tower shell, and one at an intermediate location. See photos 8 through <br />12 and KLM Drawing No. 36. <br />