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IV. CERTIFICATION DTE Stockton Used Oil Tank System December 2o18 22 CCR 66265192 requires owners of a new hazardous waste tank system to ensure that the - tank system is adequately designed and constructed,and to obtain and keep on file at the Facility,a written assessment,reviewed and certified by an independent,qualified,professional engineer,registered in California,that attests to the tank system's integrity. The preceding written assessment has determined that the tank system is adequately designed and has sufficient structural strength and compatibility with the waste(s)to be transferred, stored or treated to ensure that it will not collapse, rupture,or fail. The assessment for an above-ground system considered the following: l)design standard(s)according to which the tank and ancillary equipment have been constructed; 2)hazardous characteristics of the waste(s)to be handled; and 3)foundation and seismic anchorage design. - The tank system was inspected on December 5,2018. The visual inspection found none of the following to be in evidence for the primary tank:weld breaks,punctures,scrapes of protective coatings,cracks,corrosion,structural damage or installation defects. As required by 22 CCR 66265.192(k)(n),based on the findings of this assessment,I estimate that the new tank system has at least ten(1o)years of service life under current conditions. In accordance with 22 CCR 66265.192(h)(1),this assessment is valid for a maximum period of five (5)years and the tank system should be re-assessed at that time to obtain a new estimate of remaining service life. Based on my assessment of the tank system, I can attest that the tank system has sufficient structural integrity,is acceptable for transferring,storing and treating the intended hazardous waste, and is suitably designed to achieve the requirements under zz CCR 66z65.192. lrertlfy,under penalty oflaw that this document and allattachments wereprepared under my direction orsuperuision in accordance with a system designed to assure that qualylodpersonne/properly gatherand valuate the informationsubmitted. Based on my inquiry ofthe person or persons who manage the system,or thosepersonsdimetly mspmuibleforgathering the information,the information submitted is,to he the best ofmy knowledge and belief,true,accurate,andcomplete.lam aware thatthere are significantpenaltiesfor submitting false information,including thepossibility offuw and imprisonmentfor knowing oialatians. 1 QROFESS/0 k Nd,529$6 Go A-314. 2 -'(. /- 1-9 Stephen V. Huvane,P.E. 41Date Civil(CA)NO.52385 '� civic 9�OP CAl1I_0 4 TRC neeul6 you can rely on