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Complaint Investigation Summary Report #: 5105 COMPLAINT ID: COGILXOYZ Site Location: 1395 E PESCADERO AVE, TRACY, CA 95304 Activity Summary Activity Date Recorded by 10/07/2022 Drove to address and observed the canal being worked on. Looked inside storm PRESTO drains across the street, no storm drains on canal side. Drains were dry, no liquid or sheen observed. The end of the canal going across the street of Pescadero had an excavator removing debris and shrubbery to allow for flow into the canal from the other end. Spoke with Matt Yearian with Arnaudo Construction who was working on the canal. He said they have not observed any diesel release in the area and they are just working on opening up this canal. Yohandrys Aguilar, Senior Maintenance Worker with City of Tracy Public Works arrived on site and was discussing the canal with Matt. The canal is for irrigation run off. Per Matt there is a drainage basin for irrigation for the new CHP office that is being built that has run into the canal which could be what was reported. Walked along the entire canal. Liquid was observed with a brown color in the canal. Followed the origin of the liquid and it appears to come from the irrigation drainage basin that Matt was talking about. The liquid in the basin and in the canal were similar in qualities. Both brown and muddy. At the other end of the canal was rocks that continued separated the new canal with the dirt canal. The liquid only reached the rocks and did not cross past the rocks. Discuss observed liquid with Yohandry and we both agree that the liquid in the canal looks like water with organic materials. Diesel release at this address could not be verified. Went to YRC to verify clean up at other spill report. Per Dan Lertora, YRC Safety, he believes an employee or driver mis reported the release as 600-gallons. Called and spoke with Fish and Wildlife Warden, Trish Yamaguchi and updated her on 600-gallon diesel release. Discussed that a release was not observed at the provided address 1395 E Pescadero. There was a canal there which had liquid but was observed to be water from a drainage basin. Discussed that there was another report for 75-gallons of diesel that was released down the road at 1535 E Pescadero and a release was observed there but has been cleaned up and did not reach any waterways. Called Rameen with Cal EPA back to update her on the release. Discussed the same information as above with Warden Yamaguchi. 10/10/2022 Entered narrative information from 10/7/2022. Saved photos into shared drive. PRESTO Generated full page photos, contact sheet and photographic log. Generated ER01. Put packet together to abate as unable to verify. 5105.rpt Page 2 of 2