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Complaint Investigation Summary Report #. 5105 COMPLAINT ID: C00043251 Site Location: 833 E EIGHTH ST Activity Summary Activity Date 04/26/2017 Recorded by I received an email from Scott Hackman with Arcadis. The email detailed the SAEED result of the samples that were taken. I reviewed and printed the email and gave them to Cesar to file with the compliant the email scott mentioned that UPRR will be doing more excavation for S-4. I emailed scott and copied paul holt to notify when they do additional excavation. 05/01/2017 Reviewed analytical results. RUVALCABA 05/01/2017 At 10:28 am Scott Hackman, (916-786-7369) Senior Environmental Scientist for RUVALCABA Arcadis, was called to get an update on the re-sampling of sample location S4 that had shown a positive for "fresh diesel" or TPH-DRO in the analytic report for the first sample. Scott stated the following in summary; The S4 site had been excavated and track mat had been installed along the affected rails. Lauren was on site to take samples and would wait for EHD arrival. Left office at 10:30 AM and arrived on site at 10:35 AM. Lauren Sipich, with Arcadis and Noe Quesada, Supervisor with United Pumping were on site. The affected track areas where the locomotives were parked were covered with track mat. The S4 sample location had been excavated. A total of area of about 12 feet wide and 24 inches deep from the bottom of the track. Soil under the rail ties was not removed. One area was not excavated to the 24 inch depth because of a pipe running in between the railroad ties, area was excavated to about 8 inches. 4 samples were taken from the S4 original location, which was in the middle of the excavation. The excavated material was stored on site in large bins. Lauren stated that clean ballast would be used to backfill the excavated site. There was some water observed with what appeared to be an oily sheen in the south most end of the excavation. Water was soaked up using absorbent rags and about 3 inches of soiVmud removed with a shovel. PID readings were taken by Lauren at each hole and by taking soil from the sample site and placing it in a small plastic bag. All PID readings returned a zero value. Site was left at 11:33 and returned to office at 11:40. 07/13/2017 Emailed Paul Holt regarding analytical report from sampling that occurred on RUVALCABA 05/01/2017. 07/14/2017 Hackman, Scott <Scott.Hackman@arcadis.com> responded to request for RUVALCABA analytical results for testing on 5/01/2017 and stated the folowing "I wanted you to know that the summary letter is close to complete for the retention tank leak project. The data from the 5/1/17 additional sampling will be included in the letter." 10/19/2017 Received and date stamped Aracadis report dated 07/24/2017. RUVALCABA 10/26/2017 Called Leona Winner (916) 255-6679 DTSC, Brownfields and Environmental Restoration Project Manager. Wanted to ask about the Arcadis report and possible referral to her office. Voice mail was left. 11/29/2017 Leona Winters, Senior Environmental Scientist with Department of Toxic Substances Control, (DTSC) returned my call. IT was explained to her that the department would like to refer the complaint to DTSC because of the lab analysis that were received showing remaining contamination. Leoan stated that Union Pacific would have to fill out a form and submit it to DTSC and all paperwork and reports should come from Union Pacific. For was emailed and received. RUVALCABA RUVALCABA 5105 rpt Page 4 of 5