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the ASTs containing used oil ranges from 550-gallons (A-28 Locomotive Maintenance Building) to 18,000-gallons (A-34 and A-35 Wastewater Treatment Plant). 1.2.2 Commerce Yard The Commerce Yard contains a total of twenty (20) above-ground storage tanks (ASTs) that contain petroleum hydrocarbons (e.g, gasoline, diesel fuel, lube oil, used oil, and compressor oil) ranging in size from approximately 95-gallons to approximately 819,000-gallons. Four of these ASTs (A-4, A-6, A-8, and A-14) contain used oil generated from maintenance-related activities or recovered from the wastewater treatment system. The storage capacity of the ASTs containing used oil ranges from 500-gallons (A-8 Wastewater Treatment Plant) to 27,000- gallons (A-4 Tank Farm). 1.2.3 Richmond Yard The Richmond Yard contains a total of twelve (12) above-ground storage tanks (ASTs) that contain petroleum hydrocarbons (e.g, gasoline, diesel fuel, lube oil, used oil, motor oil, and hydraulic oil) ranging in size from approximately 250-gallons to approximately 1,460,000- gallons. Three of these ASTs (A-4, A-5, and A-10) contain used oil generated from maintenance-related activities. The storage capacity of the ASTs containing used oil range from 250-gallons (A-10 East of Trailer Maintenance Building) to 2,500-gallons (A-5 Southwest of Turntable). 1.3 Summary of Used Oil Quantities by Facility Within California, BNSF operates thirty-one (31) facilities that are associated with the maintenance and repair of locomotives or rail-bound and off-road equipment. During the 2013 calendar year, the cumulative total of approximately 3,297 tons of used oil (Waste Code 221) was generated at these facilities. All of the used oil generated from these facilities were managed as hazardous waste and shipped offsite for recycling under uniform hazardous waste manifests. Approximately 99.62% of the used oil generated by BNSF was associated with three locomotive service and maintenance facilities (Barstow [-2,395 tons], Commerce [-824.1 tons], and Richmond [-64.9 tons]). During 2013, no used oil was generated from nine (9) of the BNSF facilities. The quantity of used oil generated at the remaining nineteen (19) remaining BNSF facilities ranged from approximately 0.076 tons (or approximately 21 gallons) to 2.546 tons (or approximately 687 gallons). Table 1 provides a summary of the quantity of used oil generated from the thirty-one (31) BNSF facilities during 2013. 1.4 Historical Laboratory Analysis of Used Oil BNSF has historically collected samples of used oil from select facilities for laboratory analysis. These laboratory analyses provide additional insight regarding the general characteristics of the used oil and also provide a relative demonstration of the purity standards for recycling purposes. The most-recent laboratory analysis of BNSF used oil was obtained from the Barstow facility in Hazardous Waste Variance Application 3 July 29, 2014 BNSF Railway TRC Project No. 211983