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Project No. 10-1768 AdvancedGeo M Employee-Owned Company Page 8 of 19 4.4.4. Drainage System The Facility surface directs stormwater sheet flow to drain inlets, southeast towards the oil water separator and then to the retention pond on the southeast side of the Facility. 4.4.5. Practicability of Secondary Containment - 40 CFR 112.7(d) Facility management has determined that secondary containment is required at this site for all of the ASTs, including 55-gallon drums. 4.5. INSPECTIONS, TESTS, AND RECORDS - 40 CFR 112.7(e) As required by the SPCC rule, the Facility performs the inspections, tests and evaluations as summarized in Table 6. Daily, monthly and annual inspection requirements are described later in this section. 4.5.1. Daily Inspection A Facility employee performs a complete walk-through of the Facility each day. This daily visual inspection involves: (1) looking for tank/piping damage or leakage, stained or discolored surface hardscape, or excessive accumulation of water in berm areas and (2) verifying that the drains are correctly working. This inspection is informal, and issues are noted, if any, are documented in a daily summary report. 4.5.2. Monthly Inspection The checklist provided in Appendix B is used for monthly inspections by Facility personnel. The monthly inspections cover the following key elements: • Observing AST exterior, pipes and other equipment for signs of deterioration, leaks, corrosion and thinning. • Observing AST foundations and supports for signs of instability or excessive settlement. • Observing AST fill and discharge pipes for signs of poor connection that could cause a discharge, and AST vent for obstructions and proper operation. • Observing the constructed secondary containment berm condition. • Verifying the proper functioning of overfill prevention systems. • Checking the inventory of discharge response equipment and restocking as needed.