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Complaint Investigation Summary Report#:5105 COMPLAINT ID: CODMUHFOO Site Location: 833 East 8th St Activity Summary Activity Date Recorded by 08/21/2020 5-7 pm. Called Derek Smith, Patriot Environmental and he told me the spill BACKUS cleanup is nearing completion. I told him I'll be coming by within 20 minutes. Once on-site, I spoke with Derek Smith and Paul Masson, Union Pacific consultant. An Union Pacific representative was present but did not identify himself. Paul took my card and said he will email an incident report. According to Paul, the spill occurred from the west side of the locomotive only and spilled diesel onto soil in between two sets of tracks. The spill report lists 100 gallons spilled. Contaminated soil was excavated and placed in a Patriot roll-off bin. The cleanup appeared to excavate the contaminated soil from the current spill but apparent contamination from previous incidents was observed, especially on the west side of the excavation next to adjacent railroad tracks . Paul stated that the contamination on the west side of the excavation did not smell like diesel . He thought it was a heavier oil from a previous incident. Patriot Environmental used a portable meter to detect the diesel spill and determine where to dig. Derek Smith said the roll-off bin of contaminated soil will be left on-site until profiling. I told him that I'll need to get the disposal record and profile to close the complaint. 08/24/2020 Complaint was taken over by lead senior Garrett Backus. Printed out the ALANIZ complaint information and passed it to Garrett. 10/02/2020 Emailed Derek Smith (Patriot Env) and Mike Algots (UPRR) to get the disposal BACKUS record for the diesel contaminated soil and the waste profile. Derek emailed me back stating that"ghd" has not provided the information to him yet. He'll provide it when available. Mike Algots emailed me and said he will provide the records when available. UPRR reference number is WR 2080. 12/14/2020 Emailed Mike Algots for the waste profile and disposal record. BACKUS 12/17/2020 Received Email from Mike Algots. GHD will be providing the disposal record and BACKUS waste profile. Printed ER report and created photo log. 01/04/2021 Reviewed soil analytical results for samples taken 10-13-20. Data was received BACKUS 12-18-20. Metals, Total Petroleum Hydrocarbons and Volatile Organic Compounds were analyzed and TTLC and TCLP amounts for metals were below Title 22 CCR 66261.24 hazardous waste levels. The sample did exceed STLC hazardous waste levels for lead (11.2 ppm). The regulatory limit is 5 ppm. I emailed Mike Algots to get the disposal record. 01/05/2021 Received and filed UHWM 019703805 JJK, dated 11-13-20, for 18 cu yds of lead BACKUS contaminated soil. Abated complaint. 5105.rpt Page 2 of 2