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Complaint Investigation Summary Report#:5105 COMPLAINT ID: COWPTSQMU Site Location: 10749 W WOODBRIDGE RD Activity Summary Activity Date Recorded by and Wes(Wilbur Ellis). Observed the failed poly tank located on the east side of a warehouse/shop building, the spill impacting a large area of compact ground soil, on-site equipment, possibly a few olive trees on the edge of the orchard, and possibly the drainage pipe and ditch just south of the failed tank and the drainage pipe and ditch west of the spill. Left site for EHD. Arrived back at EHD. Emailed Isabella the Safety Data Sheet for the spilled material. Updated Elena Manzo, Ld Sr REHS. Emailed Robert McClellon, Solid Waste and Small Public Water Systems Unit Program Coordinator, and Natalia Subbotniova, Ld Sr REHS, a copy of the Cal OES spill report and update and notified them that the spill may or may not have impacted drainage ditches that lead to Sycamore Slough and the Mokelumne River. 03/29/2021 Received a call from Chris Feathers (Patriot)who confirmed the clean-up will not FLORIDO begin until the property owner approves Patriot's scope of work, which is to be completed and sent to the property owner today. Chris summarized the general scope of work, stating Patriot would place the excavated soil into roll-off bins, and take a composite sample (4 samples from one bin combined into one sample) of each bin for waste analysis and profiling. Chris also stated he would inform Jamie Dobbs to perform sampling of the drainage ditches to prove whether or not the spill impacted the ditches. Received a call from Derek Smith (Patriot) informing me that he is having trouble finding a local lab that will test for the urea ammonium. After further discussion, Derek stated he will try to find a lab that can test for the exact spill material, UAN-32 Urea Ammonium Nitrate. Derek called me back stating he found a lab, ExelChem Laboratories in Rocklin that can conduct the ditch soil sample analysis for the spill material. I confirmed that the lab is ELAP certified. Called Trevor(property representative) and asked him if the drainage ditches on the property lead to any nearby waterways. Trevor stated the ditches on his property lead to a District ditch, a pump, and then to the Mokelumne River. Trevor did not know the name of the District that owns the ditch. Generated Prop 65 and Emergency Response Record form. Phone call discussion with Kristen (Patriot) and Isabella (Water Board) regarding the final site assessment done today by Jamie Dobb's (Patriot). Kristen confirmed Jamie took soil and water samples today of the two possibly impacted drainage ditches to determine if the ditches were impacted by the spill. Kristen also stated once the property owner approves the clean-up scope of work, it may take a few days before the clean up can begin due to scheduling of the necessary equipment and personnel. Kristen to email me and Isabella a copy of Patriot's scope of work. 5105.rpt Page 5 of 7