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. Wong,Jeff [EHD] <br />From: Backus, Garrett [END] <br />Sent: Wednesday, May 19, 2021 12:58 PM <br />To: Wong,Jeff [EHD] <br />Cc: Henry, Michelle D [EHD] <br />Subject: FW: Etching room - Stockton Propeller <br />Jeff, <br />Here are photos of the etching room where the facility plumbing is located. The site discharges spent nitric acid (DE- <br />SMUT N53) and Caustic Soda (NU-ETCH E2) and rinse water which contains both chemicals along with residual metal <br />residue into the on-site septic tank. <br />They also discharge spent Ardrox 970P25E penetrant and rinse water which contains this chemical into the onsite septic <br />tank. <br />Mike Belmont, the service manager, stated that they discharge 5 gallons per day of these chemicals. <br />The Ardrox photos and discharge location will follow in a separate email. <br />Garrett <br />From: Henry, Michelle D [EHD] <nnhenry@sjgov.org> <br />Sent: Wednesday, May 19, 2021 12:07 PM <br />To: Backus, Garrett [EHD] <gbackus@sjgov.org> <br />Subject: Etching room <br />1