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13 <br />4.2.7 Coating Serviceability <br />The estimated remaining coating life or serviceability evaluation was <br />performed using a wide variety of inspection instruments such as dry <br />film thickness gauge, pen knife, Tooke gauge, adhesion tester(s), 30x <br />microscope and serviceability evaluation experience (minimum <br />experience 10 years). <br />4.2.8 Coating Lead and Chromium Content Analysis <br />Samples were taken of the various types of coatings present on the <br />interior and exterior surfaces. Corrosion Control Consultants and Labs <br />of Kentwood, Michigan tested these coatings in conformance with <br />ASTM D-3335 Standard Test Methods for Concentrations of Lead and <br />Chromium in Paint. Copies of the Laboratory Analysis are included in <br />Appendix D. <br />