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PO Box 1928 STI SP-001 <br /> POWERS BENICIA,CA <br /> TEL 707707 333343400 STOCKTON EAST WATER DISTRICT STOCKTON,CA <br /> FAx 707 922 2284 <br /> ENGINEERING$INSPECTION,INC. www.Powersei.conn Gasoline Tank <br /> I Ultrasonic Thickness Test <br /> Ultrasonic Thickness Test was performed on accessible sections of the steel tank shell and end caps. All <br /> spot readings returned approximately nominal thickness of 0.240-in on the shell and 0.310-in on the heads. <br /> All UT scrubs had minimal to no change in signal signifying little to no metal loss. "I/A" means the locations <br /> were Inaccessible safely. <br /> Tank Shell <br /> Drop <br /> Shell Course Location <br /> 1 2 3 4 <br /> Top 0.237 0.240 0.241 0.239 <br /> 1 Middle 0.240 0.235 0.240 0.238 <br /> Bottom 0.241 0.240 0.235 0.237 <br /> Tank End Caps <br /> Readings (in.) <br /> Location <br /> 1 2 3 4 <br /> West End Cap 0.305 0.310 0.303 0.308 <br /> East End Cap 0.307 0.309 0.306 0.310 <br /> Tank Roof <br /> Readings(in.) <br /> Location <br /> 1 2 3 4 <br /> Roof 0.241 0.235 0.239 0.238 <br /> STI-SP001 Stockton Water District TkNo Gasoline Stockton,CA 2019 Rev Date Printed:2/4/19 <br /> O..docx <br /> ©2018 PE&I Inc. <br /> Page 15 <br />