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4. Material Thickness —Nominal 3/16 -inch ranging from 0.167 of an inch to 0.189 <br />of an inch (see Technicon ultrasonic measurements in Appendix `C' of this <br />report). <br />5. Pipe Systems— See report item A.1 thru A.3 and B.3 above. <br />6. Description of Internal and External Pumps <br />a. The new oil tank is emptied via an external ram pump operated by air <br />pressure. <br />b. The used oil is similarly pumped into the tank and then the tank is emptied <br />via suction provided by the recycle vendor. <br />7. Tank Sketch — See structural calculations in Appendix `B' of this report. <br />8. Estimated Age — Constructed by Brown -Minneapolis Tank, located in Provo, <br />Utah in December 1999 (approximately 12 years). <br />9. Leak Detection Equipment — Leak detection is visually accomplished. The "tank <br />system" has secondary containment with a monitor gauge at the east end. <br />10. Corrosion Protection — The interior of the tank is in excellent condition protected <br />by the thin oil coating inside the tank. The exterior is protected by paint. The <br />thinnest steel plate shell is more than 1/16 inch greater thickness than required by <br />the structural design. <br />11. The tank is fitted with internal, manually monitored level gauges. The tank fills <br />so slowly that it is periodically inspected before it would fill. <br />12. Structural Damage — No structural damage was observed which would prevent <br />certification. <br />13. Leak Test Inspection and Ultrasonic Tests — The tests revealed no leaks. <br />14. Estimated Service Life — The estimated service life of the tank is well in excess of <br />the 5 -year certification period for this tank. <br />15. The cable ground at the tank is rusted and should be cleaned. The grounding <br />screw to the building should be increased to 3/8 -inch diameter. <br />16. Tank Support — The tank and saddle dimensions are such that the tank is stable <br />with the applied lateral and vertical loading. The soil pressures under adverse <br />loading are high at 4 KSF but should not affect tank stability (see the soils <br />evaluation dated May 10, 2011, in Appendix `D' based on the referenced soil <br />report for the original site design). <br />Ell 1-008 3 Field Observations <br />