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�6j Thatcher Chemical Tank Closure, 9/24/20 <br /> ► sem . <br /> ACf�". <br /> enviro <br /> Figure I - Tank pieces, stored on pallets <br /> a <br /> �A <br /> A closure certification inspection was conducted on 9/24/2020 to verify surface acid or base <br /> contamination had been removed from tank pieces. <br /> • In general surface pH was evaluated on the upper left and upper right, in the middle of <br /> the stack (left and right) and near the bottom of the stack left and right) for a total of 6 <br /> pH measurements from each pallet <br /> • The pieces on the pallet were tested using a spray bottle to wet the surface with <br /> deionized water at different points on the pallet (upper left, upper right, left middle, <br /> right middle, left lower & right lower). See figure 2, below <br /> Figure 2 - Surface pH measurement <br /> �- 4 <br /> a <br /> 7408.548.5050 967 Mabury Road,San Jose,CA 95133 <br /> F 408.548.5052 www.ACTenviro.com Page 2 of I 0 <br />