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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 /> C. There is currently no redundant secondary containment present. <br /> Consider installing a diked area sufficient to hold 110% of the <br /> tanks capacity in case of secondary tank failure. <br /> 4. Access e VT and a. The roof of the tank is accessed via portable ladder. <br /> structure measurement of <br /> access structure <br /> components <br /> 5. Coatings . VT of Coatings a. The tank was visually inspected for any coating failure. The <br /> tank shell, ends, and appurtenance coatings are in good <br /> condition, with areas of isolated coating failure. Isolated areas of <br /> flaking coatings and light corrosion are present along the shell. <br /> Consider applying touch-up coatings to all areas of coatings <br /> failure. <br /> b. The tank saddles are experiencing minor coating failure and <br /> corrosion on the saddle to concrete support interface. Monitor <br /> the condition during periodic inspection. <br /> 6. Venting . VT of existing a. The tank is equipped with a 2-in normal vent with a total of 3.14 <br /> venting system square inch of surface area opening which is less than the 12.57 <br /> • Calculate square inch of the largest in use nozzle (4-in). The normal <br /> Venting venting is undersized sized according to NFPA 30 and UL 142. <br /> Requirements Consider installing a 4-in normal vent. <br /> b.According to the Morrison Venting guide, NFPA 30, and tank <br /> placard the tank minimally requires an 8-in emergency vent with <br /> 392,000 SCFH venting capacity for both the secondary and <br /> primary tank. The secondary tank is equipped with one 8-in <br /> weighted lid emergency vent. The primary tank is equipped with <br /> long bolts on the manway that allow for lift in the event of <br /> emergency venting. <br /> 7. Grounding . VT grounding a. The tank is adequately grounded with the steel saddles and <br /> system bolts. <br /> 8. Signage and . VT to document a. The tank has a diamond placard hazard sign required by NFPA <br /> Placards Fire Department 704. The signage is slightly worn but appears to be in good <br /> Signage condition. <br /> b.The original nameplate is worn and illegible. Vital tank <br /> information is missing. <br /> 9. Gauging . VT of tank a.The tank has an automatic tank gauging system. The gauge <br /> Gauging system appears to be in good condition and is in working order. No <br /> anomalies were noted by operations. <br /> b.The tank gauging system is sufficient for this tank. <br /> 10. Piping e VT of piping a.Visual inspection of the piping components was performed. The <br /> system threaded components near the pumping station are seeping. <br /> Minor product stains are on the concrete platform and ground. <br /> Consider resealing all threaded connections. <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 3 <br />