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The average thickness is 25 mils and the coating system is not tightly <br />adhered to the steel. The lead content is in excess of 13,000 ppm or 1.3 % by <br />weight (laboratory analysis attached). <br />The interior coating is an epoxy system of 20 mils and is in fair condition. <br />Approximately 5% rust was noted on the interior tank shell. All of the rafters <br />are rusting. The lead content is approximately 60 ppm. <br />15. CATHODIC PROTECTION <br />The tank has an abandoned impressed current cathodic protection system that is <br />not operational. The anode cover plates on the roof are not properly sealed, <br />and one is completely missing. A total of 16 anode access holes are located on <br />the roof. <br />16. CONCLUSIONS & RECOMMENDATIONS <br />a) The structure was built in 1957 and is in need of rehabilitation. The roof <br />support structure and the protective coatings are damaged beyond repair <br />and should be replaced. <br />b) The protective coatings are no longer providing adequate corrosion <br />protection and need to be replaced. The high lead content in the exterior <br />coating requires engineering controls to protect the environment when it is <br />removed (laboratory analysis attached). <br />c) The roof support system is in poor condition due to severe corrosion <br />damage. The lateral support rods for the truss rafters are corroded and some <br />are broken. Access onto the roof and into the tank should be restricted until <br />the roof support is repaired. <br />d) The anode cover plates on the roof are not properly sealed and one is <br />completely missing, resulting in a 6" diameter hole into the water <br />compartment. <br />e) Estimated construction cost to completely rehabilitate the structure, <br />including containment and lead abatement per TCEQ regulations is <br />$600,000. <br />4~ 491 <br />