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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 08/28/2021 9:03 am, called Jocelyn 415-710-0074 with Arcadis, no answer. Called Zantha MANZO 925-597-7321 with PG&E, left a voice message asking for a call back with today's schedule. Called Dave Larsen 209-401-9719 (PG&E), Dave provided an update, they are removing concrete and excavating soil and Arcadis doing confirmation soil sampling. 10:29 am, received a call back from Zantha, went over the plan for confirmation soil sampling. Reviewed a sampling map sent by Zantha. (12 min) 11:18 am left to go to the site. 11:54 am, arrived onsite, PG&E, Arcadis, PSC and Clean Harbor crews are onsite working on concrete removal. Jocelyn with Arcadis collected one concrete grab sample from inside the storm drain inlet wall (stand pipe) just below the top hat, some darker soil was noted in a small area (2") between the storm drain top hat and the concrete stand pipe and pointed out to Jocelyn with Arcadis. Concrete was removed from the gutter area, pavement was removed from the driveway area, additional soil excavation was conducted around the power pole in the area of two rain gutter drain pipes that exited from below the sidewalk at street level next to the power pole. Arcadis collected soil samples from below the removed concrete and from the bottom of excavated areas. Trench plates and ply wood sheets were utilized to cover the area of excavation, the area was delineated with caution tape and cones. The sidewalk will be closed until the site restoration is complete. Three 20 yard bins of waste concrete and excavated soil were generated and transported off site under hazardous waste manifests (023134177JJK, 023134173JJK, 023134172JJK) for disposal. Twenty nine confirmation soil and concrete samples were collected today by Jocelyn with Arcadis. 3:15 pm left the site to go to another spill, some left over sampling and site securement still needs to be done. 5:20 pm, received a call from Dave Larson with PG&E, he indicated that the site excavation and sampling is done and the site is secured; Dave will send pictures showing the final site disposition. Site backfilling and concrete restoration will occur after the confirmation sample results are received and they indicate that no further excavation is necessary. 08/30/2021 Received update from Lead Senior Elena Manzo (EHD) regarding additional MURO cleanup and confirmation samples on 8/28/2021. 08/30/2021 Site visit to verify spill site is still secured per Elena's request. Observed the MURO caution tape was cut at each end. All other tape and metal sheets covering the trench were still in place. Called Dave Larsen (PG&E) to advise that the caution tape was cut at each end. Dave said he will take care of it. 08/30/2021 Downloaded and reviewed inspection pictures. Sent a email to Ricks, Zantha <ZXS8@pge.com>; Muro, Claudia [EHD] <cmuro@sjgov.org> with a picture from 8/28 showing the inside of the storm drain. Some dark staining can be visible on the picture located on the soil interface between the storm drain top hat and the storm drain box (drain pipe) Marked the area of staining on the pictures. A sample was collected above and below the observed staining, the staining was brought to the attention of Jocelyn with Arcadis (while onssite), asked Zantha on what the planned action for the stained soil. MANZO 5105.rpt Page 8 of 12