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Address: Stockton Propeller, 2478 Wilcox Road, Stockton Record ID PR05448740 <br /> Date: 5-18-21 Program: HW generator <br /> M' <br /> I 1 <br /> IMG 0519 Etching Room. Container used to rinse propellers with water after etching with NuEtch E3 (potassium hydroxide solution,pH <br /> 13.9). A pH measurement conducted by Garrett Backus found the rinse water to be pH 4. The site pumps the rinse water to the septic tank <br /> when spent. The spent rinse water going into the septic tank needs a documented hazardous waste determination. If found to be hazardous <br /> waste it must be disposed of as specified in the California Health& Safety Code and Title 22 California Code of Regulations . <br /> Garrett Backus, REHS Page 12 of 52 <br />