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Complaint Investigation Summary Report #: 5105 Site Location: 2401 N MACARTHUR DRCOMPLAINT ID: CO0053618 Recorded byActivity Date Activity Summary 04/01/2021 SAEEDRespond with John Alaniz to inspect the facility due to the ammonia release occurred yesterday. Met with Ben Schlegemilch. Refer to John's narratives for more details about the incident and follow-up. Helped John to generate the OIR. 04/01/2021 ALANIZInvestigated the site with Haza Saeed, lead senior. Permission to do the inspection was granted by Ben Schlegelmilch, engineering manager. The following information was written on the official inspection report (OIR): On 3/31/2021, approximately 109 pounds (calculated by facility) of anhydrous ammonia was released to the air from a flange connected to the HCR-PE system/evaporative coil (EC) located inside the “Freezer Outfeed.” According to Ben Schlegelmilch, engineering manager, penetrations in the roof allowed moisture to come inside the freezer causing ceiling ice build-up. The facility hired Crown Painting Inc (contractor) to dislodge ice off of the ceiling. Facility employees placed a plywood board on the flange and associated piping of the EC to protect the equipment. According to Ben, contractors were told by the facility not to use the plywood for ice accumulation storage. The facility determined that the weight of the ice placed on the plywood by the contractor caused the flange gasket to get damaged. The leak was discovered by facility personnel inside the freezer smelling the ammonia. The ammonia detector registered 100 PPM. The City of Tracy Fire Department responded to the incident and assisted with patient care. The facility’s response team was able to isolate the leak and replace the damaged gasket. Two contractor employees were exposed and sent to the hospital. 50 employees (approximately 1/3 of facility personnel) from the surrounding rooms were evacuated. The facility managers walked the perimeter and did not detect any ammonia with their personal detectors. The San Joaquin County Environmental Health Department (EHD), conducted a site visit on 4/1/2021. It was confirmed that the gasket had been fixed. The facility could not provide any training documents for the contractor. The ammonia detector adjacent to the outside wall of the freezer read 0.0 PPM. The facility has started their incident investigation. Please submit the following documentation to the San Joaquin County by May 1, 2021: 1) Incident investigation report detailing the root cause of the incident and any recommendations made 2) CalARP/RMP contractor program (policies, procedures, training, evaluation…etc.) 3) Management of Change for installing the HCR-PE system 4) A copy of the latest seismic assessment report 5) The procedure for detecting ammonia inside the cold storage rooms/freezers The report was emailed to Ben at < bschlegelmilch@leprinofoods.com>. Received a call from Captain Eric Oliveri with the City of Tracy Fire Department. He asked if there was any information the EHD needed from him. I asked him several questions. Captain Oliveri said that the fire department focused on patient care during the incident. They did not smell any ammonia outside of the building upon arrival. They did not do any perimeter walkthroughs with an ammonia detector. Downloaded the photos and created a photo log. Moved the photos to the pending folder and created a file for the complaint. 5105.rpt Page 2 of 3