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Complaint Investigation Summary Report #: 5105 COMPLAINT ID: COW7NCVWX Site Location: 3900 HOLLY DR Activity Summary Activity Date Recorded by 01/27/2021 Received spill report 21-0436 at 7:48 am. 2400 pounds of 19% liquid ammonia BAKER released from a damaged pipe. Release occurred at City of Tracy's Wastewater Treatment Plant at 3900 Holly Drive. Called Aoke Vaid at 209-831-6328 for details regarding the release. A transfer line was damaged as a result of the storm. Ammonia flowed onto the dirt, to a storm drain and then to the retention pond. Heavy rains washed ammonia into retention pond. Facility believes dirt is not impacted by release. Contents of retention pond will be put back into the waste water treatment system. Discussed with Elena Manzo (Lead Sr. REHS), Haza Saeed (Lead Sr. REHS) and Melissa Nissim (Program Coordinator). Called Aloke Vaid with additional questions regarding spill. NRC was notified. No spill material went into secondary containment. No evacuations or injuries. No ammonia can be smelled right now. No ammonia alarms are going off currently. Aloke Vaid is unsure if pond is lined but does not think so. Storm water and effluent that is not approved for discharge typically go into the pond. Left office to visit site. Arrived on site with Haza Saeed (Lead Sr. REHS). Met with Aloke Vaid (Operations Superintendent) and Deborah DeWolf (Administrative Technician). Spill is believed to have occurred at approximately 6:30 pm on 1/26/2021 when a ladder fell onto the pipe due to the high storm winds. Leak was discovered when operator noticed ammonia smell in the area. Pipe where leak occurred was located between the ammonia tank and the shed with the pump. Broken pipe has been repaired. Ammonia flowed onto ground in a southwest direction. Two puddles of clear liquid were observed approximately 15 feet from the leaking pipe. No smell of ammonia was detected in the area. Haza Saeed used an ammonia detector while on site. No ammonia was detected by the equipment while on site. Puddles were approximately 5x5 feet in size. pH was taken of both puddles. pH result was 7-8 for both puddles. The heavy rains caused the ammonia to flow to the storm drain approximately 100 feet away and east of the original leak. No ammonia detected in area of the storm drain. Storm drain leads to a pump. The pump leads to the retention pond. The retention pond is approximately ten million gallons in size. Retention pond did not appear to be lined. No ammonia detected in the area of the retention pond. At least 25 ducks/geese were observed on the retention pond. Incident investigation by responsible party has already been started. Per, Aloke Vaid, water in retention pond will be tested prior to discharge. SJC EHD requested responsible party to notify Regional Water Board of release. Returned to office. Generated complaint, Emergency Response Record and site map. Wrote Notice to Abate. Emailed Notice to Abate to Deborah DeWolf & Aloke Vaid at deborah.dewolf@cityoftracy.org and aloke.vaid@cityoftracy.org. Completed prop 65 and put on Elena Manzo's desk for review. Completed photo log. Verified GIS in EC. 01/28/2021 Called Regional Water Board 5 at 916-464-3291 regarding spill. Given email for BAKER Howard Hold at howard.hold@waterboards.ca.gov. Emailed Howard Hold about complaint and Water Board requirements. Called and left a message for Howard Hold at 916-464-4679. 5105.rpt Page 2 of 3