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Spill Prevention, Control and Countermeasure Plan Tesla Treatment Facility Page 42 of 45 4.2.3 Facility Drainage System Design [40 CFR§112.12(b)(3)] The Tesla Treatment Facility, including the substation transformer outside the Electrical Building, is serviced by a stormwater sewer system that is engineered to discharge into a retention basin located along the south side of the facility From the retention basin, drainage flows via a stormwater sewer pipe eastward to the property's perimeter and then continues offsite downslope towards Interstate 1-580, located approximately 0.6 miles east of the Tesla Treatment Facility. A physical layout of the Electrical Building and substation transformer is presented in Figure A- 5.1 in Appendix A. Any significant spill or discharge that occurs from the substation transformer not captured by containment measures has the potential of flowing by surface flow into a stormwater catch basin inlet located approximately 50 feet south of the substation transformer. Stormwater runoff and surface drainage in general entering this stormwater inlet is diverted via a 15-inch underground sewer pipe to a retention basin along the south side of the Tesla Treatment Facility, providing opportunity for capturing an uncontrolled oil discharge from the facility. Any potential discharge from the standby transformer outside the Electrical Building will tend to pool and collect around the transformer housing inasmuch as the area has a gentle slope of low relief, facilitating spill response and cleanup by facility operators. Any oil discharge from the transformer storage tank would be restrained by containment with absorbent,booms and other spill response materials available at the facility. 4.2.4 Drainage Diversion System [40 CFR§112.12(b)(4)] 40 CFR§112.12(b)(4) of the SPCC Rule is not applicable to the facility. 4.2.5 Drainage Water Treatment [40 CFR§112.12(b)(5)] 40 CFR§1121.12(b)(5)of the SPCC Rule is not applicable because drainage waters are not treated at the Tesla Treatment Facility. 4.3 Bulk Storage Containers [40 CFR§112.12(c)] 40 CFR§112.12(c) of the SPCC Rule pertains to bulk storage containers. By definition in Section 40 CFR§112.2, oil-filled electrical equipment is not considered by the SPCC Rule to be a bulk storage container. Therefore, 40 CFR§1121.12(c) is not applicable to the substation transformer. 4.4 Facility Transfer, Pumping and Facility Process [40 CFR§112.12(d)] 40 CFR§112.12(d)(1), CFR§112.12(d)(2) and CFR§112.12(d)(3) of the SPCC Rule are not applicable because there is no piping associated with the substation transformer. 4.4.1 Inspections, Testing and Records [40 CFR§112.12(d)(4)] Inspection of the substation transformer is conducted once every three (3) years, and whenever material repairs are performed,to assess the structural and operational integrity of the transformer. As summarized in Section 2.9 of this SPCC Plan,the exterior of the substation transformer housing is inspected visually for signs of dielectric oil leakage; exterior distress, damage, corrosion, or staining; and condition of the transformer foundation and supports.