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Non-destructive Metal Thickness Testing <br />Williams Tank Lines - Stockton, CA <br />Metal thickness testing and evaluation was performed on May 5, 2015, as per Steel <br />Tank Institutes guidelines and the requirements of the SPCC Plan Section <br />112.8(c)(6). <br />§ 112.8 Spill Prevention, Control, and Countermeasure Plan requirements for <br />onshore facilities (excluding production facilities). <br />(c) Bulk storage containers. <br />(6) Test each aboveground container for integrity on a regular schedule, and whenever <br />you make material repairs. The frequency of and type of testing must take into account <br />container size and design (such as floating roof, skid mounted, elevated, or partially <br />buried). You must combine visual inspection with another testing technique such as <br />hydrostatic testing, radiographic testing, ultrasonic testing, acoustic emissions testing, <br />or another system of nondestructive shell testing. You must keep comparison records <br />and you must also inspect the container's supports and foundations. In addition, you <br />must frequently inspect the outside of the container for signs of deterioration, <br />discharges, or accumulation of oil inside diked areas. Records of inspections and tests <br />kept under usual and customan/ business practices will suffice for purposes of this <br />paragraph. <br />Metal thickness testing was performed utilizing a certified Danatronics EHC-09DL- <br />CW Digital Ultrasonic thickness gauge. Calibration of the testing unit was performed <br />on May 5, 2015, prior to conducting certified non-destructive metal thickness testing. <br />Testing consisted of A point measurements per square foot. The Certified UL 142 <br />aboveground steel #2 Diesel fuel storage tank was evaluated from the lower portion <br />of the tank to at or above the midline. All report readings are the average thickness <br />readings per square foot and an average for the entire side was reported. No <br />defects were observed and the oil product tanks are reported to be in compliance <br />with CFR 112.8(c)(6) requirements. Williams Tank Lines Certified UL 142 <br />aboveground steel #2 Diesel fuel storage tank passed their non-destructive metal <br />thickness test evaluation. <br />Testing frequency is recommended to be on a five year basis. <br />Gary Reeves, <br />S <br />Certified Steel Tank Institute Level 1 <br />& Level 2 Tank and System Inspector. <br />SP001 Level I1 #11111 <br />NDT UT Level 111 #001 <br />