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From: mtmpchem@aol.com <mtmpchem@aol.com> Sent: Thursday, May 19, 2022 10:02 AM To: Backus, Garrett [EHD] <gbackus@sjgov.org> Subject: Applied Aerospace Structures Corp.-3437 So. Airport Way, Stockton CAUTION: This email is originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe. Good Morning Garret, Thank you for your time and guidance today. To Recap: RE: Applied Aerospace Structures Water/Chromium Tank Disposal. 1. We plan to sample the poly tank by taking physical pieces of the tank. 2. The analysis will be for chromium. 3. A waste determination will made once the analytical is completed. 4. This tank will be disposed as either Non-RCRA or RCRA on a hazardous waste manifest based on the analytical results. Please confirm my understanding of our conversation- Disposing of the tank as hazardous waste eliminates the need to complete the hazardous waste closure certification form. It also deletes the requirement to complete the following highlighted in yellow below: (1) Prior to initiating cleaning, cutting, dismantling, or excavation of a tank system, the owner or operator of the tank system shall notify the appropriate CUPA in writing of the information specified below. If there is no CUPA, then the owner or operator shall notify the LIA and send a copy to the authorized agency. However, information already provided to the CUPA, authorized agency or LIA pursuant to compliance with another statutory or regulatory requirement need not be resubmitted: (A)The location of the tank system; (B)The date(s)the tank system will be cleaned and/or excavated, or closed in place; (C)A brief description of the tank system; (D)The identification of the hazardous material or hazardous waste last held in the tank supported by: 1. A statement signed by the tank operator certifying the identity of the material or waste last stored or accumulated in the tank; or 2. If residuals remain in the tank in sufficient quantity to be collected and analyzed, a chemical analysis of the residual in the tank; (E)The name and credentials of the individual who will provide certification pursuant to subsection (f), when applicable; and (F)The intended disposition and destination of the tank system. Respectfully, Michael Montanus 2