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Complaint Investigation Summary Report#:5105 COMPLAINT ID: COSZGWLWK Site Location: 2357 PISA CIRCLE, STOCKTON, CA Activity Summary Activity Date Recorded by 11/21/2020 8:56 am received a page from the SJC General Hospital. Called General Hospital MANZO and obtained PG&E transformer spill information for a residential location at 2357 PISA Circle, Stockton, CA. Mike Green 925-658-0437 has reported to the hospital operator that they had a transformer spill and that it was already cleaned up, and that the pad-mounted transformer was already replaced. I checked the email for the spill report, two spill reports were received, one at 4 am, and one at 4:14 am—the initial spill report(Cal OES Control#:20-6501) and the update. Per the spill reports: "A vehicle struck a pad-mounted transformer causing the release, material flowed onto the soil, vegetation, concrete and asphalt, RP is handling the containment and clean up. " I called Michael Green at 925-658-0437; Mike indicated that the spill happened last night, a pad-mounted transformer was hit by a vehicle in a residential area of Stockton. Mike stated the transformer had been replaced, and Dave Larsen of PG&E conducted the cleanup. Mike noted that approximately 30 gallons of non-PCB transformer oil was released from the pad mount transformer. Some released oil went onto a residential lawn, and some flowed onto the street and pavement area. No storm drains were impacted. Mike indicated that the spill had occurred at 3:50 am this morning and that he called to notify the EHD at that time (the call was forwarded to the SJC General Hospital). Mike indicated that he called 209-468-3420, and the General Hospital on-call service did not pick up. Mike indicated that he made the Cal OES notification and then attempted to call again this morning to notify the EHD again. Mike indicated that, this morning he was able to get through, and that's how the EHD was paged. 9:12 am called Dave Larsen with PG&E 209-401-9719, the mailbox was full, and I could not leave any messages. 10 am-arrived on-site observed PG&E crew and crane working on replacing the transformer. Met with Dave Larsen with PG&E. Dave indicated the cleanup had not been completed yet. Twelve drums (55 gallons each) of excavated soil and used absorbent were generated. Dry absorbent was applied to the stained pavement area adjacent to the steel site and swept up. All generated waste drums were labeled with hazardous waste labels. An area of several feet wide and several feet deep was excavated around the transformer pad. The lawn area appeared slightly wet; no odor or oily sheen was observed on the grass in the area of the transformer. Dave Larsen indicated house residents were made aware of the incident; one of the residents is currently home sleeping after a night shift. Dave indicated that he provided the resident with his contact information for lawn repairs. Dave indicated that an oil sample was collected for PCB determination. Dave also indicated that several hundred households are still without power since yesterday, and they are making power restoration their priority. Since the resident was sleeping, I was not able to make contact with the property owner. 10:15 am called Mike Green and let him know that the transformer has not been replaced yet, and the cleanup has not been completed. Mike appeared to be surprised to hear this information. He asked if Dave received the sample results back. I told him that he did not indicate to me that he did or not. I asked Mike about the property owner's contact information. Mike indicated that Alex Steele would be the best person to contact regarding this information on Monday. According to Dave Larsen, the spill occurred between 9 pm and 10 pm last night. Dave also indicated that he let Mike with PG&E know regarding the spill at that time it happened on 11/20/2020. Dave indicated that sprinkles were on for watering sometime before or after the spill had occurred. Prior to EHD's arrival, the concrete pad under the transformer was removed, and the soil under the pad was excavated. Dave indicated that he removed 12 drums of soil from under the transformer pad and that all visible contamination was excavated. He will provide pictures of the spill itself as well as the cleanup before the new pad was installed. Since EHD was not notified when the spill occurred, I was not able to verify the soil condition below the replaced concrete pad. However, no staining was noted at the 5105.rpt Page 2 of 3