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'`' Thatcher Chemical Tank Closure, 9/24/20 <br /> ACT' <br /> 4� <br /> enviro <br /> After wetting each of the 6 identified points on the pallet, a strip of pH paper was laid face <br /> down on the wetted surface and left there for a minimum of 15 minutes, in order to obtain <br /> adequate contact/reaction time between the pieces' surface & pH paper surface. <br /> • Photos of all pH strips are included as Attachment A. <br /> • In summary, all surface pH measurements were between pH 5 and pH 7 <br /> This evaluation shows that the cleaning and decontamination activities conducted by Thatcher <br /> were effective and that there is no remaining surface contamination. Based on this, UPCF <br /> Tanks Closure Certification forms have has been completed for the 4 tanks and signed by a <br /> Certified Industrial Hygienist. These are included below as Attachment B <br /> T408.548.5050 967 Mabury Road,San Jose,CA 95133 <br /> F 408.548.5052 www.ACTenviro.com Page 3 of 10. <br />