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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 /> Executive Summary <br /> Powers Engineering and Inspection, Inc. (PEI) was contracted by Stockton East Water District to provide <br /> an STI SP001 Inspection for a gasoline tank at the Stockton, CA facility, on November 30, 2018. This tank <br /> inspection included the tank, tank appurtenances, tank foundation, and tank containment. In addition, PEI <br /> inspected all piping, piping connections and supports, and tank related electrical components from the first <br /> skin valve to the first flanged connection outside the containment. <br /> This report is generated on data gathered from three locations: applicable codes, regulations, and laws;the <br /> observed field conditions existent during the STI-SP001 inspection; and material provided in written form <br /> by the facility, end-user, or client (e.g., as-builts, previous inspection reports, written transcriptions of <br /> conversations with the facility). This inspection report is based solely on empirically observable conditions, <br /> observed during the inspection process and correspondence with the facility or end-user. <br /> The Gasoline Tanks is an 8.5-ft. diameter x 13.5-ft. long, horizontal cylinder, with a butt-welded shell. The <br /> tank's nominal capacity is calculated at 5,700.00 gallons. <br /> Inspection Methods Results <br /> Goal Employed <br /> 1. Hydraulic . VT of tank a. Visual assessment and non-destructive testing performed did <br /> and bottom, not identify any key components that may affect the hydraulic <br /> Structural appurtenance, integrity of the tank. <br /> Integrity shell, piping, b. The tank is supported on two steel saddles. No redundant <br /> containment area secondary containment such as a dike wall is present. As a <br /> for signs of method of spill control, there is a spill kit located at the tank. The <br /> product leakage. owner/operator should ensure that the spill kit is complete and of <br /> proper size viable for the tank. <br /> c.The inspection of the tank was performed while the tank was in- <br /> service. The tank appears to be in good overall condition. <br /> d. No significant items were noted that would affect the structural <br /> integrity of the tank. <br /> 2. Release VT of Release a. The tank is elevated on saddle supports and has a Continous <br /> Detection Prevention Release Detection Method (CRDM). If the tank is leaking, there <br /> Barrier RPB will be visual evidence around the base of the tank. <br /> • Review of b. The gasoline tank has a spill kit on site and is used for overfill <br /> Continuous prevention and therefore is a category 1 tank. <br /> Release c.Minor seepage and staining around the piping was observed on <br /> Detection Method the 4-in issue nozzle and associated '/2-in tubing. <br /> CRDM d. The fire extinguisher is located next to the tank instead of 15-ft <br /> away. In the event of a tank fire, the extinguisher may be too <br /> close to be accessible. Consider relocating the fire extinguisher. <br /> 3. Containment . Measure a.The secondary tank was in good condition. No permeability was <br /> containment noted. UT thickness readings were taken along the shell and <br /> • Determine heads. Readings showed an approximately nominal thickness <br /> permeability of with an average reading of 0.238-in for the shell and 0.306-in for <br /> containment the heads. . <br /> b.There is currently no redundant secondary containment present. <br /> Consider installing a diked area sufficient to hold 110% of the <br /> tank's capacity in case of secondary tank failure. <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 2 <br />