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Brown Sand,Inc. Spill Prevention, Control, and Countermeasures Plan Page: 21 June 3, 2020 or leaks resulting from any type of tank or product line failure. Facility spill response procedures are closely followed as outlined in the Spill/Discharge Response Plan, Section 4.0. 3.6 Drainage Control, Diversionary Structures, and Containment(40 CFR 112.7(c)) Storm Water Management The maintenance yard is graded in such a way as to move storm water to the southwest where is flows down to the truck parking area, where it collects in a depressed ponding area(Figure 6). Storm water captured in the depressed ponding area is allowed to percolate into the ground and evaporate into the atmosphere. All spills and leaks that would not be held within secondary spill containment structures would flow in this direction as well. The truck parking area is designed with a depressed ponding area that is approximately 500' x 190'. The area would be more than sufficient in containing any catastrophic event and prevent off site discharge, effectively protecting the navigable waters of the State of California. 3.7 Practicability of Secondary Containment(40 CFR 112.7(d)) Brown Sand, Inc. has determined that secondary containment is practicable at this facility and is discussed in Section 3.4.2 of this Plan. 3.8 Inspections/Record Keeping(40 CFR 112.7(e)) As required by the SPCC rule, facility inspections, tests, and evaluations are conducted daily, monthly, and annually to all aboveground storage tanks and their apparatus (Appendix D). Daily inspections will include a visual inspection of all aboveground storage tanks and associated pipes,and all dispensers. Monthly and annual inspections will be performed in a more detailed manner by personnel knowledgeable of the tanks and their components. All monthly and annual inspections will be documented on a Monthly or Annual Inspection Log(Appendix E) and will be maintained for a minimum of three years with the SPCC plan. In addition,integrity testing or environmental equivalence to integrity testing will be performed on all ASTs. The recommendations for integrity testing are based on the Steel Tank Institute's (STI) SP001 standards. Records of all integrity testing will be maintained on site. During daily and monthly visual inspections,any evidence of spills at the dispensers,pipes, or tank loading areas will be noted and documented.