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t' Thatcher Chemical Tank Closure, 12/28/20 <br /> ta <br /> ACTO' v, <br /> enviro <br /> Figure I - Tank pieces, stored on pallets <br /> A-4 '4 <br /> T<C <br /> " 1 <br /> A closure certification inspection was conducted on 12/15/2020 to verify surface acid or base <br /> contamination had been removed from tank pieces. <br /> • Tank A-D were evaluated on the upper left and upper right, in the middle of the stack <br /> (left and right) and near the bottom of the stack for a total of 5 pH measurements from <br /> 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 /> After wetting all identified points on the pallet, a strip of pH paper was laid face down on <br /> the wetted surface and left there for a minimum of 15 minutes, to obtain adequate <br /> contact/reaction time between the pieces' surface & pH paper surface. <br /> T408.548.5050 967 Mabury Road,San Jose,CA 95133 <br /> F 408.548.5052 www.ACTenviro.com Page 2 of <br />