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Ms. Lynsey Sammons San Joaquin County Environmental Health Department June 3, 2025 www.arcadis.com 2/3 French Camp, ca - December 23, 2024 Container Fire - Emergency Incident Report.docx Name, address, and telephone number of the facility’s owner/operator: Union Pacific Railroad Company, 1400 Douglas St, Stop 0780, Omaha, NE 68170, 916-789-5048. Name, address, and telephone number of the facility: Lathrop Intermodal Terminal, 1000 E. Roth Road, French Camp, CA 95231, 800-877-5123. Date, time, and type of incident (e.g., fire, explosion, etc.): December 23, 2024, 19:40, Fire. Name and quantity of material(s) involved: Intermodal crane 90903 and refrigerated container RCLU 22001. The extent of injuries, if any: No injuries were reported. An assessment of actual or potential hazards to human health or the environment: Arcadis mobilized to the Site to assess the potential hazards to human health and the environment. Arcadis observed that the diesel- impacted rinse water had been contained in the Site storm drain system and basin. The impacted area has been remediated and there is no ongoing potential hazard to human health or the environment. An Emergency Response Summary Report documenting the remedial activities is planned to be submitted to the SJCEHD at a later date. Estimated quantity and disposition of recovered material that resulted from the incident: The incident resulted in the following recovered material: one 55-gallon drum with two burnt car batteries, four 55-gallon drums of absorbent powder, five 55-gallon drums of diesel-impacted water, six 250-gallon totes of diesel-impacted water, one 20-cubic yard roll off bin of vegetation debris, and one 20-cubic yard roll off bin of absorbent boom. Waste was sampled and profiled and the waste has been transported off-site and disposed in accordance with UPRR procedures except for the bin of vegetation debris and the bin of absorbent boom. The two remaining bins are planned to be transported off-site for disposal. Copies of the disposal records will be included in the Emergency Response Summary Report planned to be submitted to the SJCEHD at a later date. Cause(es) of the incident: Container fire based on information in the RMCC report. Actions taken in response to the incident: The LFD rinsed the area impacted by the fire with water. GrayMar Environmental Services, Inc. (GrayMar) utilized a pressure washer to clean the concrete surfaces and storm drain conveyance piping. Rinse water was collected using a vacuum truck and/or contained in the basin. An underflow dam was installed at the piping inlet to the basin and used to contain debris that were then recovered by GrayMar. Visible hydrocarbon sheen was also recovered from the water in the basin using a vacuum truck. Additionally, GrayMar applied MicroBlaze® (a microbial solution used to remediate petroleum hydrocarbons) to the soil in the basin. Additional information regarding the actions taken by UPRR will be included in the Emergency Response Summary Report planned to be submitted to the SJCEHD at a later date. Administrative or engineering controls designed to prevent such incidents in the future: The incident was considered an accidental fire based on the current information; therefore, new preventative measures were not installed at the facility. Fire suppression systems and fire department notification equipment is in place at the Site, which were helpful during the incident. Closing This Report has been prepared and submitted to the SJCEHD in accordance with the Consolidated Contingency Plan for the Site. An Emergency Response Summary Report is also planned to be submitted to the SJCEHD at a later date that will document the information associated with the response, provide copies of waste disposal