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STI External Tank Inspection Q <br /> DPRR—Stockton yard,Stockton,CA TNKO-0295 <br /> June 2019 <br /> antevigroup <br /> Cathodic Protection-Corrosion NA <br /> protection system tested, <br /> maintained,and operational in <br /> accordance with standard <br /> requirements? <br /> Do the Containment Structures No <br /> exhibit any delamination of <br /> caulk,any holes,washout, <br /> degradation,corrosion,leakage, <br /> paint failure,or tank settlement? <br /> Foundation Type Tank is founded on 12 foot x 12 foot reinforced concrete pad and <br /> anchored to pad by 12 brackets around base of tank. <br /> Foundation settlement or No <br /> washout? <br /> Corrosion,cracking,or paint yes. Minor corrosion on anchor brackets. <br /> failure of supports? <br /> Water drains away from tank? No. Water standing on pad,west side of tank,between tank and <br /> diversion wall. <br /> Concrete pad/ring wall cracking No <br /> or spalling? <br /> Grounding/bonding straps No ground present. <br /> secured and in good condition? <br /> TANK SECONDARY CONTAINMENT <br /> Tank Secondary Containment Alternate method. Tank is located within wastewater treatment plant <br /> containment area. A diversion wall on west side of tank and slope direct <br /> spill toward wastewater collection pit to the south of tank. <br /> Containment size 12,145 gallons <br /> Freeboard 25 yr/24 hr <br /> Number of Tanks in Containment N/A <br /> Largest Tank Capacity N/A <br /> PIPING CONSTRUCTION DETAIL <br /> Piping Diameter(inflow) 2" <br /> Piping Type(inflow)-Placement Aboveground. Pipe runs from oil skimmer to bottom of tank. <br /> Piping Type(inflow)—Material Coated steel <br /> Piping Type(inflow)—Secondary Alt Method. Asphalt covered surface. Drainage to wastewater collection <br /> Containment pit. <br /> Piping(inflow) 33%inch transfer from separate used oil collection bin. <br /> Pumped via pneumatic pump which is manually operated. <br /> Piping Diameter(outflow) 3" <br /> Piping Type(outflow)- Aboveground <br /> Placement <br /> Piping Type(outflow)-Material Coated steel. Pipe is connected to bottom south side of tank truck hose. <br /> Connection is with the wastewater containment area. <br /> Piping Type(outflow)-Secondary Alternate method. Asphalt covered surface. Drainage to wastewater <br /> Containment collection pit. <br /> XINOGEM <br /> 2 us.artteagroup.00m <br />