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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 Principal/Chemist (707) 426-0981 office (707) 372-7396 cell (707) 305-5686 fax CONFIDENTIALITY NOTICE: This communication and its attachments may contain non-public, confidential, or legally privileged information including HIPAA-protected PHI. The interception, use or disclosure of such information is prohibited. If you are not the intended recipient, or have received this information in error,please notify the sender immediately by reply email and delete all copies of this message and attachments without reading, saving, or further distributing them. 3