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-:e�, <br /> OUHAY SILVER AltrvEs <br /> Rationale for the external shell testing of tanks is tabulated in Table 4.3. Ultrasonic shell testing <br /> will be conducted by a qualified person in accordance to the protocol described in Appendix D. <br /> This will establish the baseline condition for the 2027 internal inspection of tank C-1. <br /> Test reports will be filed in a central location. Results of the testing will determine either if <br /> tanks are placed out of service or a new test period will be established. <br /> Table 4.3 Rationale For PE Determination of Tank Shell <br /> Testing Per STI SP-001 <br /> By B. Briggs <br /> CO 31956 Date: August 2021 <br /> Container C-1 C-3 C-4 C-5 C-6 C-7 C-8 C9 <br /> Multiple <br /> 10,000& tanks 9,200 <br /> Capacity(gal) 1000 55 55 500 55 55 & smaller 10,000 <br /> Diesel/ Oil/ Oil/ Oil/ Mill <br /> Contents Unleaded Lubricant Used Oil Diesel Lubricant Lubricant Chemicals Diesel <br /> Shop <br /> constructed? Yes Drum Drum Yes Drum Drum Yes Yes <br /> Year placed in not not not not <br /> service 2012 refilled refilled 2012 refilled refilled 2021 2021 <br /> Years in <br /> service 6 N/A N/A 6 N/A N/A 0 0 <br /> Past leaks or <br /> other <br /> problems No No No No No No No No <br /> All sides <br /> visible? Yes Yes Yes Yes Yes Yes Yes Yes <br /> Visual <br /> Condition Excellent Excellent Excellent Excellent Excellent Excellent Excellent Excellent <br /> Building <br /> Secondary double spill spill spill spill Containment double <br /> Containment wall pallet pallet none pallet pallet 220% wall <br /> Volume 110% 110% 110% —.110% 110% 110% <br /> Leak <br /> Detection Yes No No No No No No No <br /> Visual <br /> Inspection Monthly Monthly Monthly Monthly Monthly Monthly Monthly Monthly <br /> Required Shell Mar Mar <br /> Test 2027 N/A N/A 2027 N/A N/A N/A Aug 2036 <br /> Spill Prevention Control and Countermeasure Plan 24 P a g e <br />