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►��i4W r �P ACT%14 enviro October 13, 2020 Garrett Backus, Ld. Sr. REHS, CUPA programs San Joaquin County Environmental Health Department 1868 E Hazelton Ave, Stockton, CA 95205 (209) 468-2986 gbackus(asigov.org Re: Thatcher Chemical Tank Closure, 9/24/20 Dear Mr. Backus As previously discussed, the Thatcher Company of California-Stockton (AKA Thatcher Chemicals), located at 1010 Industrial Dr, Stockton, CA 95206 (CERS ID 10183569, Facility ID FA0010456) maintained four poly tanks, ranging in size from 5,000 gallons to 15,000 gallons. The tanks are designated as tanks A, B, C & D and held corrosive liquids, including sulfuric acid and sodium hypochlorite (see table 1, below). The tanks were longer needed and were decommissioned by Thatcher Chemical personnel by cleaning with water until rinsate and surface pH inside the tanks was above 2 and less than 12.5. The tanks were then cut into pieces, these pieces were placed on one or more pallets (as shown in Table 1) and held for tank closure certification, prior to disposal. The rinsate from the tank cleaning was collected and evaluated with respect to hazardous waste criteria prior to disposal. Table I - Tank Summary Tank# Tank Contents Description # of Pallet# # pH Measured Pallets samples pH range Tank A Sulfuric Acid Acid Tank 5 Al —A5 (6) per pallet 5 - 7 Tank B Sodium Hypochlorite Pre-Filter Tank 5 BI — B5 (6) per pallet 5 - 7 Tank C Sodium Hypochlorite Pre-Filter Tank 4 CI — C4 (6) per pallet 5 - 7 Tank D Sodium Hypochlorite Post Filter Tank I DI (6) per pallet 5 - 7 Figure I (below) shows the tank pieces, stored pallets • White pieces were from the sulfuric acid tank • Blue & Light blue pieces were from I Pre-filter tanks (holding sodium hypochlorite) • Black pieces were from the post-filter tank (holding sodium hypochlorite) T408.548.5050 967 Mabury Road,San Jose,CA 95133 F 408.548.5052 www.ACTenviro.com Page I of I 0