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Mf-714 TIFI—F3f_70LrJJET7 a ke rn xnrmos Gnpen • Less than 50 gallons is expected to be release due to these types of spills. The Spill Control Equipment located near each transformer is sufficient to manage the anticipated spill volume, either through the use of absorbent materials, or by the deployment of storm drain covers. Oil/Water Separator Oil/Water Separators are exempt from all SPCC requirements when used for wastewater treatment only in accordance with §112.1(d)(6) and do not count toward facility storage capacity. The sand-oil interceptor (a type of oil/water separator [OWS]) at M-B Stockton is located below grade south of the truck wash facility that it serves, and is used for wastewater treatment only. The separator is pumped out twice each year. There is not a loading/unloading rack associated with this transfer area. Following an example (for a kitchen grease trap) provided in Chapter 5 of the SPCC Guidance for Regional Inspectors, the OWS at M-B Stockton is used solely for the pretreatment of wastewater, and is therefore eligible for the wastewater treatment exemption. However, the transfer of oily wastewater and sludge from this exempt OWS, using a vacuum truck, is subject to the general containment requirements of§112.7(c) if the transfer area does not meet the definition of a "loading/unloading rack." Sufficient secondary containment for an OWS unloading area may be provided by active containment measures deployed either prior to transfer (e.g., placement of a drain cover over a storm water drop inlet) or in reaction to a discharge as long as the certifying PE determines that the active containment measures are sufficient and can be reliably deployed in time to prevent the spilled material from reaching navigable waters or adjoining shorelines (emphasis added). The typical failure mode, and the most likely quantity of oil that would be discharged for transfers out from this OWS are as follows: • Failure of truck mounted equipment (piping,valves, tank, etc.) • Mishandling of equipment during the transfer (open valve, incorrect handing of hose, etc.) • The release rate is not expected to be greater than 6 gpm, except in the instance of a transformer fire. This rate is estimated by • Less than 50 gallons is expected to be released due to these types of spills. Free-Board Calculations Accounting for Precipitation Given the nature of the bulk storage secondary containment (double-walled tanks and indoor storage, fully compliant with 112.7(c)), free-board calculations are provided for tertiary containment purposes for the bulk oil storage at the facility (not required under 40 Secondary Containment Calculations Page 3 of 5 Appendix L