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Complaint Investigation Summary Report #: 5105 COMPLAINT ID: COPOYHLBX Site Location: 8925 THORNTON RD, THORNTON, CA Activity Summary Activity Date Recorded by 11/12/2021 Called Tua Lino, Project Manager to check in on clean up process. The phone PRESTO number was incorrect. Called Fremouw Environmental to get Tua's phone number. Received the correct number and called Tua. Per Tua, clean up just completed. Provided afterhours inspector contact information in case he needs to contact them. Informed him afterhours inspector will arrive to verify clean up. 11/12/2021 Site visit on 11/12/2021 in response to spill report received for 15-gallons of red dye diesel discharge. Fremouw Environmental Services was on site upon arrival. Met with Tua Lino, Project Manager with Fremouw Environmental. Walked with him and looked inside both catch basins, the 3 interceptor sumps and the storm drain in the middle of Walnut Grove. The western catch basin was the only sump that appeared to be impacted from the spill. The eastern catch basin contained a small amount of liquid but no sheen or odors. The first interceptor sump, furthest from the storm drain, had a small amount of sheen but no sheen was observed in the other 2 interceptor sumps closest to the storm drain. Per Tua, based on the connections of the catch basins and his observations, he does not believe the sheen observed in the first interceptor sump is related to the spill. The storm drain bottom was wet but sheen or odors were not observed. Absorbent sand was observed around the concrete tank pad around dispenser 7A and dispenser 6 toward western catch basin. Absorbent sand was also observed going toward the eastern catch basin but did not reach it. Both catch basins had absorbent booms placed around it. Staining is still visible around the tank pad and around the western catch basin. Per Tua, the concrete will be power washed, the catch basins will be jetted and the liquid from the jetting will be vacuumed up and will not reach the storm drain or the interceptor sumps. All waste will be hauled away by Fremouw Environmental Services. The fueling station has been taped off with cones and caution tape and the entrance and exit to facility have been blocked with cones and caution tape. Fremouw Environmental is awaiting another truck to begin the clean-up process. Notice to abate emailed to Lauren Takos, EHS Manager laurent@ramosoil.com Advised Tua to call me when clean up has been or will soon to be completed. 11/12/2021 Met with Tua Lina of Fremouw Environmental at the site location. All impacted areas have been pressure washed. Oil staining, sheen, and odors were not observed on the concrete tank pad, asphalt, or inside the catch basins. Per Tua, approximately 830 gallons of rinseate was vacuumed into Fremouw's truck and will be transported to Fremou's facility at 6940 Tremont Rd, Dixon, CA 95620. Per Tua, the rinseate will be disposed as non-RCRA hazardous waste and transported to Heritage - Crystal Clean LLC at 1620 E Brundage Ln, Bakersfield, CA 93307 within 10 days (manifest #123160239). Tua stated he was unsure where the used/oily absorbent has been placed. Per Tua, he was informed that the facility will place all used absorbent booms and absorbent sand into hazardous waste drums. The oily absorbent sand and booms will be left on site for disposal at a later time. (4:30pm to 7:30pm) PRESTO VANG-LEE 11/15/2021 Completed photo log. VANG-LEE 5105.rpt Page 2 of 3