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ICNEXUS <br /> ENGINEERING <br /> corrosion rate of brass was significantly higher when using the GA9058 additive vs . the <br /> existing 9888 additive. Although higher than 9888 corrosion rate, the rate of corrosion of <br /> brass with GA9058 was calculated to be about 0 . 2 MPY (mill per year), well below the <br /> acceptable corrosion rate of 1 MPY (assuming best practice of inspection and <br /> maintenance of tank system ) . <br /> Nexus did not verify the condition of existing equipment including the tank Itself and any <br /> associated components . The drawings , chemical composition data , and information on <br /> the components within the system were provided to Nexus by Lubrizol . It is Nexus' expert <br /> opinion that the change in chemical additive from ULTRAZOL 9888 to ULTRAZOL <br /> GA9058 will not increase the risk of primary component failure of the components <br /> assessed as outlined in this letter. <br /> Sincerely, <br /> } <br /> 81 /.23 " l ?N <br /> �� yf , 111P4 �q <br /> Amy Lee , M . S . , RE , (CA License CH 6235 ) <br /> Process Engineer <br /> Nexus Engineering Group <br /> Compiled with assistance by <br /> Mallory Auxier <br /> Attachments . <br /> GA9058 Material Safety Data Sheet <br /> 480 W . DUSS81 Dr . Suite # 250 I Maurnee , UH 43537 <br /> Nexus Bcusinels ConfWanhty <br />