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Jff#—n'zq 7z 7_j9R0 11ER_ J dna%".F C_Mj Oil Storage area Containment Area Net depth Net Containment (ft2) (inches or volume) Volume (gallons) Transformer XF-3 Covered Storm Est. 3,000 ft' Dry weather 206 Drain, curb and curb height containment is 750 ft3 gutter area 6", 150 (5,600 gals) (south) lineal feet Net with design storm available event': 206 gals 1 Design storm event is the 25-year, 24-hr precipitation of 2.89 inches. 2 Depending on the location of the O/W Separator pump out tank at the time of a release, and the volume of oily water spilled, one or both of these areas might be engaged in the spill response. Note: the use of Covered Storm Drain Collection areas (and sorbent materials) is considered active containment. If drain covers are to be used, storm drains will need to be covered and sealed to minimze leakage. For the transformers, this active containment measure meets the requirements under 40 CFR 112.7(k). For the OWS pump-out operation (transfer), EPA provides guidance for active containment measures (see https://www.epa.gov/oil-spills-prevention-and-preparedness-regulations/spcc-rule- amendments-streamlined-requirements#when). When could active containment measures be appropriate? For discharges that occur only during manned activities, such as transfers, an active measure may be appropriate. The measure should be properly constructed and deployed in a timely manner, to contain the volume and rate of oil discharge. These active measures could also be applied to other situations, as deemed appropriate by a Professional Engineer(or owner/operator of a qualified facility). In this instance, the Professional Engineer has deemed appropriate the use of storm drain covers and absorbent materials to address releases from the OWS transfer, and such use complies with the requirements of 40 CFR 112.7(c). Calculations and design of active measures by: Anthony S. McElligott, P.E. Secondary Containment Calculations Page 5 of 5 Appendix L