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Transformer Oil Release Clean-up and Closure Report 1049 South Wilson Way, Stockton California 2.1 Emergency Response July 27, 2021 — 1:30 a.m. PG&E responded to the report of a fallen transformer pole resulting in transformer oil release located near 1049 South Wilson Way, Stockton, California. The transformer pole fell after a motor vehicle collided with it. The vehicle struck the transformer pole, veered into a nearby lot, and came to rest. The PG&E crew found that three of the transformers on the pole were damaged. Two of the damaged transformers were found to be empty; the third was mostly full. The release volume was estimated at approximately 22 gallons of oil. Some of the oil had entered the gutter on the west side of South Wilson Way, and had traveled to a storm drain, located approximately 100 feet south of the pole. The spill affected an area measuring approximately 30 feet by 110 feet. The affected features within this area included parts of South Wilson Way, the associated gutter and storm drain, the adjacent sidewalk, and a parking area on the property at 1049 South Wilson Way (Figure 2). After the spill was identified, the affected area was made safe with barricade tape to delineate spill locations and prevent public access. The roadway was closed to prevent vehicular traffic from entering the spill area. The emergency response assessment was communicated to the PG&E Environmental Field Specialist (EFS). PG&E obtained an oil sample from the each of the three damaged transformers for same-day laboratory analysis for PCBs by Castle. Aroclor 1260 was detected in each of the three oil samples, at concentrations of 650 parts per million (ppm) in Sample A, 7.6 ppm in Sample B, and 410 ppm in Sample C. No other Aroclor compounds were detected in the oil samples. The laboratory report is included in Appendix A. July 27, 2021, 12:00pm — PG&E notified the California Governor's Office of Emergency Services and the San Joaquin CUPA of the release and indicated that emergency spill response and clean-up activities were underway. 2.2 Phase 1 2.2.1 Phase 1 Clean-up and Oil Sampling July 27, 2021 - Ancon personnel were dispatched to the site by PSC in response to the notification from PG&E. Ancon used a hydro-jet to triple-wash and then power-wash the street, gutter, and storm drain, as well as the driveway and parking lot area of the adjacent property at 1049 South Wilson Way. The washing was supervised by personnel from the City of Stockton. A degreaser was used during the triple wash; any applied absorbent applied was collected into waste drums. Wastewater from the triple wash and power wash was collected into waste drums. The area was left covered and barricaded. July 27, 2021 - PG&E contacted Arcadis to coordinate clean-up verification sampling. July 28, 2021 - An underground service alert (USA) ticket was called in by Hydrochem PSC. Ponder arrived on site and conducted a small excavation to remove affected soil near the base of the transformer pole (Figure 2). arcadis. corn Stockton Release Closure Report_07062022 2