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Union f acifi�, Waste Oil Tank Assessment, 10,000 gahoa tank (2009) <br />Secondary Containment Design: <br />The seconda containment for the waste oil tank and ancillary equipment <br />excluding theaste oil collection trough is a asphalt and concrete pad that drains <br />into a collectio sump which then is pumped either to the waste water holding <br />tank or to the waste water treatment system. The treated waste water is then <br />discharged to t e City of Stockton Sewer District. <br />The secondary containment excluding the waste water holding tank has a <br />volume of approximately 22,000 gallons which includes the waste water <br />treatment pad, collection ditch, sump and lift station. The twenty five year rain for <br />a single day is .42 inches. The volume of this event's collected waste water is <br />approximately 7,500 gallons. The remaining secondary containment volume is <br />14,500 gallons which is sufficient for the waste oil holding tank TNKO — 0295. <br />The secondary containment for the waste oil collection trough is contained within <br />a separate sec ndary containment. The volume of this containment is 67 gallons. <br />The volume of he rainwater collected during the 25 year event is 54 gallons. The <br />waste oil collec ion trough is kept empty therefore the containment is sufficient. <br />Secondary Co tainment Inspection: <br />The secondary containment was inspected and was found to be free of breaks <br />