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Complaint Investigation Summary Report #. 5105 COMPLAINT ID: C00052900 Site Location: 16777 HOWLAND RD Activity Summary Activity Date Recorded by 11/10/2020 Emailed Ryan Mock (Simplot) at: Ryan.Mock@simplot.com request for status. MURO Asked Ryan 1) if they will be disposing of the tank's inner lining material and 2) to clarify the photo of the spout with a pan underneath Ryan replied the following: * Current tank status: The tank is empty and no longer leaking as of 11/5/2020. Any phosphoric acid release is contained within the concrete ring wall. * He is not sure if the tank liner will be replaced or repaired. If replaced, it will be disposed of. *The drip pan under the leak detection port was placed to see if there was any acid between the liner and the tank. They did not see any acid come out of that port *They will have meetings over the next couple of days to finalize the plan for cleanup, repair, and any remediation. 11/12/2020 Discussed current complaint status with Elena Manzo (EHD) since I will be away MURO for a few days. She requested that I send her what is pending for this complaint via email. I sent Elena Manzo an email with status, pending items, and contact information. 11/19/2020 Called Ryan Mock, 209-328-0083, tank has been offloaded and the tank is being MANZO cleaned out right now before the liner can be inspected. Once the tank is clean, the tank will be moved off the pad and they will begin on the remediation. 11/20/2020 Read status update by Elena Manzo (EHD) MURO 12/01/2020 Received response from Ryan Mock (Simplot). He reported that Simplot is still in the process of cleaning the tank so it can safely be inspected. After the tank is clean, it will be inspected and then moved off of its pad. Then they will assess the pad will then be able to determine remediation. I replied to acknowledge receipt of his response. 12/10/2020 Called Ryan Mock (Simplot) for status on the phosphoric acid tank. Ryan Mock reported: They had a meeting on the tank today. They are still cleaning the tank; it is a slow process. MURO MURO 12/18/2020 Sent email to Ryan Mock (Simplot) requesting status update. Asked if scheduling MURO has begun for cleanup. Ryan Mock reported The tank is in the process of being cleaned. The waste will be hazardous. Samples of waste were sent out for analysis for Non-RCRA or RCRA determintion. Cleanup process will be time consuming, but is in process. 12/30/2020 Emailed Ryan Mock (Simplot) at: Ryan.Mock@simplot.com for follow-up. Asked MURO him to notify EHD in advance before backfilling the spill area so that we inspect the cleanup. 01/07/2021 Emailed Ryan Mock (Simplot) at: Ryan.Mock@simplot.com. for status update. MURO Ryan Mock reported on 01/08/21 that the tank cleaning is still in process. The soil excavation will begin late next week if the tank cleaning is completed by then. 01/15/2021 Sent Ryan Roth an email requesting status update. MURO 01/21/2021 Sent follow up email to Ryan Mock (Simplot) at: Ryan.Mock@simplot.com. MURO 5105.rpt Page 4 of 9