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Complaint Investigation Summary Report #: 5105 COMPLAINT ID: COGENUJ36 Site Location: IN FRONT OF 1049 S WILSON WAY Activity Summary Activity Date Recorded by 08/17/2021 Requested copy of analytical lab report for the phase one confirmation samples MURO and advised to notify EHD of scheduling for phase two confirmation sampling event. Received response from Zantha Ricks with a copy of the 5-page Chain of Custody (COC) and lab receipt listing all samples received and their conditions. Zantha reported that the lab is currently overloaded with other samples and may not get the results until Friday, (08-20-2021). 08/17/2021 Organized complaint documents. MURO 08/19/2021 Generated folder into Unit III "01 Pending Complaints" folder and titled it: MURO COGENUJ36 PCB Spill 07-27-2021_CM. Uploaded photos from 7-27-21 and 8-11-2021 into Public folder: CUPA Inspection Photos and placed copy in the temporary 01 pending complaints folder. Also placed copy of lab receipt and coordinates to spill site in the pending complaints folder. 08/25/2021 Called Zantha Ricks to request sample results and scheduling information for the MURO next sampling event. Left message. 08/26/2021 Called Alex Steele (PG&E) 209-337-8902, since I have not received an update MURO from Zantha Rick's (PG&E). Alex reported that the concrete samples came back non-detect for PCBs. The storm drain did come back positive. PSC contractors, Dave Larson (PG&E), Arcadis, and Alex Steele will be on-site this Saturday, 8-28-2021 for the next phase of the sampling. They will be breaking concrete over the gutter and part of the street and will be doing additional sampling. Called Zantha Ricks at 925-597-7321. I let Zantha know I spoke to Alex Steele regarding the lab results for the Phase 1 sampling and asked if she could provide a copy of the lab report. Zantha stated that they provide a copy of the results at the end of the process in the report and she if she sends us a copy, we will be receiving two copies. I asked for a copy anyway. Zantha reported: The crew will be on-site possibly as early as 7:30 AM to begin set-up and traffic control. Sampling will be done intermittently; they will be breaking concrete initially so sampling will not be done immediately after the work has begun. The parking lot came back non-detect. In addition to the concrete/asphalt sampling, Arcadis will sample the catch basin and will actively reach inside to sample the pipe. Jocelyn Wong (Arcadis) will be on-site again to do the sampling (mobile #: 415-710-0074). Point of contact will be Alex Steele as he is the lead on this spill (mobile #: 209-337-8902). 08/26/2021 Updated Elena Manzo on the information provided by Zantha Ricks. Received a copy of Phase 1 EXCELCHEM Laboratories, Inc lab report. 08/27/2021 Received Phase 2 sampling map for the PCB sampling event scheduled for Saturday, 8/28/21. Called Alex Steele (PG&E) because we received a missed call from him. Alex reported PCB sampling phase 2 is still scheduled for tomorrow. MURO MURO 5105. rpt Page 7 of 12