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Complaint Investigation Summary Report #: 5105 COMPLAINT ID: COPPAQCQZ Site Location: WESTBOUND HWY 4, 3 MILES EAST OF TRACY BLVD Activity Summary Activity Date Recorded by 08/05/2021 I contacted Juan Armendariz to get an estimated time of clean-up. Per Juan, road VANG-LEE closures should be complete by 9am and clean-up would start shortly after. Inspectors Vicky yang-Lee, Elena Manzo, Kristina Saeturn of the EHD arrived on site shortly after 9am. Juan Armendariz of Caltrans and Ponder Environmental were on site. The road was not yet closed and clean-up did not start yet. I received an email from Agustin Diaz of the Ag Commissioner with contact information for the farmers in the area. While on site, I contacted the farmers to notify them of the diesel spill entering the slough and advised them to contact me if they notice any odor or sheen when pumping water from the slough. I contacted Kent Kiefer of Herbert Speckman Farms at 209-649-3456, Tyler Williams of WMD Farms at 209-678-0223, and Jim Barsoom of Ensher-Alexander Barsoom Farms at 916-417-8206. I left messages for Ronnie Del Carlo Farms at 209-464-2724 and B&R Te Velde Farms at 209-481-3641. Per Juan, clean-up would not start for another hour. I left the site at approximately 9:45am. I returned to the site at approximately 11:15am. Ryan Rodriguez of Fish and Wildlife and Lonnie Jones of the Coast Guard were now also on site. Ponder Environmental was still actively removing the contaminated hyacinth water plants from the slough and placing it into a 20 yard bin. There was sheen observed in the slough in the areas where the plants had been removed. Absorbent pads were placed in the slough to absorb the diesel. Per Ryan of Fish & Wildlife and Jose of Ponder, they are trying to complete the clean-up by 3pm. I left the site at approximately 12pm. I returned to the site at approximately 2pm. All the impacted water plants had been removed, placed into the 20 yard bin, and would be hauled to a Caltrans location on 270 S. Aurora St, Stockton, Ca 95206. The shoulder of highway 4 had been excavated but due to moisture from the plant removal, I was unable to determine if the clean-up was adequate. Clean-up is incomplete and will resume 08/06/2021 at approximately 9am. Ponder will return to remove the hard boom, absorbent boom, and absorbent pads from the water. The excavated shoulder will be backfilled with gravel after the EHD has confirmed clean-up is adequate. Completed Prop 65 and generated an Emergency Response Record. 08/06/2021 Left for site to verify clean-up. Arrived on site. Boom and absorbent pads still in water. No sheen observed. Faint smell of diesel observed. Area of excavation was muddy. Unable to determine if soil still contaminated with diesel. Dry areas appeared to be clean. Clean-up plan for the day was to remove boom and backfill soil. Sent photos of site to Fish & Wildlife and the Coast Guard. Called Craig Haffner (Fish & Wildlife Biologist) at 707-718-6948 and discussed photos and plan. He said that it was ok to go ahead with the clean-up as planned. Called Lonnie Jones (Coast Guard) at 614-212-3464 and discussed photos and plan. He said it was ok to go ahead with the clean-up as planned. Six garbage bags of boom and absorbent pads were generated from the clean-up. Hard boom was removed from water. No sheen observed after boom and absorbent pads were removed. Waste will be taken to CalTrans yard. Left site. BAKER 08/09/2021 Texted pictures of final clean-up to Craig Haffner (Fish & Wildlife Biologist) at BAKER 707-718-6948 and Lonnie Jones (Petty Officer Coast Guard) at 614-212-3464. Completed photo log 5105 rpt Page 3 of 4