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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.Powerseixom Tank 19 <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 nominal thickness, approximately 0.171-in. All UT scrubs had minimal to no change <br /> in signal signifying little to no metal loss. "I/A" means the locations were Inaccessible safely. <br /> Tank Shell <br /> Drop <br /> Shell Course Location <br /> 1 2 3 4 <br /> Top 0.170 0.171 0.173 0.170 <br /> 1 Middle 0.171 0.170 0.171 0.169 <br /> Bottom 0.170 0.171 0.169 0.172 <br /> Tank End Caps <br /> Readings(in.) <br /> Location <br /> 1 2 3 4 <br /> North End Cap 0.171 0.170 0.172 0.170 <br /> North Knuckle 0.170 0.172 0.171 0.170 <br /> South End Cap 0.170 0.171 0.170 0.171 <br /> South Knuckle 0.168 0.172 0.169 0.172 <br /> Tank Roof <br /> Readings(in.) <br /> Location <br /> 1 2 3 4 <br /> Roof 0.170 0.171 0.169 0.170 <br /> STI-SP001 Stockton Water District Tk 19 Stockton,CA 2019 Rev O..docx Date Printed:2/4/19 <br /> ©2018 PE&I Inc. <br /> Page 15 <br />