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Chapter 4:Secondary Containment and Impracticability Determination equipped with secondary containment sized in accordance with §112.8(c)(11).The facility owner or operator may determine that it is impracticable to provide sized secondary containment in accordance with §112.8(c)(11), when the container is in use at the facility,or the general containment of§112,7(c), pursuant to§112.7(d). If so, then the SPCC Plan must properly explain why secondary containment is impracticable, and document the implementation of the alternative regulatory requirements of§112.7(d). 4.7.6 Mobile Refuelers and other Non-transportation-Related Tank Trucks (General Secondary Containment Requirement,§112.7(c)) When mobile containers meet the definition of mobile refuelers, in §112.2,then they are excluded from the sized secondary containment requirements for bulk storage containers. Providing sized secondary containment for vehicles that move frequently within a non-transportation-related facility to perform refueling operations can raise safety and security concerns (71 FR 77266, December 26,2006). However,the general secondary containment requirements at§112.7(c)still apply.Furthermore,since mobile refuelers are a subset of bulk storage containers,the other provisions of§§112.8(c)and 112.12(c)also still apply. The definition of mobile refueler describes vehicles of various §112.2 sizes equipped with a bulk storage container such as a cargo tank or Mobile refueler means a bulk storage tank truck that is used to fuel or defuel aircraft,motor vehicles, container onboard a vehicle or towed, locomotives,tanks,vessels or other oil storage containers, including that is designed or used solely to store full trailers and tank semi-trailers.The definition also includes nurse and transport fuel for transfer Into or from an aircraft,motor vehicle, tanks,which are mobile vessels used at farms to store and transport locomotive,vessel,ground service fuel for transfers to orfrom farm equipment,such as tractors and equipment,or other oil storage combines,and to other bulk storage containers, such as containers container. used to provide fuel to wellhead/relift pumps at rice farms.A nurse Note:The above text is an excerpt of the SPCC tank is often mounted on a trailer for transport aroo nd the farm, and rule.Refer to 40 CFR part 112 for the full text of the rule. this function is consistent with that of a mobile refueler. The exemption from sized secondary containment for mobile refuelers also applies to other non-transportation-related tank trucks ss Other non-tra nsportation-related tank trucks may operate similarly to mobile refuelers,though not specifically transferring fuel. Instead,these tank trucks may carry other oils such as transformer oils,lubrication oils, crude oil,condensate,or non-petroleum oils such as AFVOs. Examples include a truck used to refill oil-filled equipment at an electrical substation and a pump truck at an ail production facility.These tank trucks may have the same difficulty in complying with the sized secondary containment requirements as mobile refuelers.Therefore,all non-transportation-related tank trucks a re excluded from the sized secondary containment requirements for bulk storage containers, however the general secondary containment requirements at§112.7(c)apply(see 73 FR 74236, December 5,2008). Vehicles used to store oil,operating as on-site fueling vehicles within locations such as construction sites, military, or civilian remote operations support sites, or rail sidings are generally considered non- a' For more information on theyotediction of non-transportation-related tank trucks see Chapter 2:SPCC Rale Applicability. SPCC GUIDANCE FOR REGIONAL INSPECTORS 4-60 December 16, 2013