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"%14600" <br /> ■ <br /> 4W 41P <br /> ACT."Ilk <br /> enviro <br /> December 23, 2020 <br /> Garrett Backus, Ld. Sr. REHS, CUPA programs <br /> San Joaquin County Environmental Health Department <br /> 1868 E Hazelton Ave, Stockton, CA 95205 <br /> (209) 468-2986 <br /> gbackus(a)sigov.org <br /> Re: Thatcher Chemical Tank Closure, 12/23/2020 <br /> Dear Mr. Backus <br /> The Thatcher Company of California-Stockton (AKA Thatcher Chemicals), located at 1010 <br /> Industrial Dr, Stockton, CA 95206 (CERS ID 10183569, Facility ID FA0010456), previously <br /> submitted a tank closure report for four tanks on September 24, 2020. These tanks have been <br /> cleaned and disposed of properly. Since then, there were four more tanks decommissioned. <br /> These tanks held corrosive liquids including sodium hypochlorite, Sodium Hydroxide, and <br /> Hydrochloric Acid (see table 1, below). <br /> The tanks were no longer needed and were decommissioned by Thatcher Chemical personnel <br /> by cleaning with water until rinse and surface pH inside the tanks was above 2 and less than <br /> 12.5. The tanks were then cut into pieces, these pieces were placed on one or more pallets (as <br /> shown in Table 1) and held for tank closure certification, prior to disposal. The rinsate from <br /> the tank cleaning was collected and evaluated with respect to hazardous waste criteria prior to <br /> disposal. <br /> Table I - Tank Summary <br /> Tank# Tank Contents Description # of Pallet# # pH Measured <br /> Pallets samples pH range <br /> Tank A Diatomaceous Earth Post Filter I A I-I (5) per 7-8 <br /> Tank pallet <br /> Tank B Sodium Hydroxide Post Filter 3 BI-1-3 (5) per 7-8 <br /> Tank pallet <br /> Tank C Hydrochloric Acid Post Filter 10 CI-1-10 (5) per 7-8 <br /> Tank pallet <br /> Tank D Sodium Hypochlorite Post Filter 5 DI-1-5 (5) per 7-8 <br /> Tank pallet <br /> Figure I (below) shows the tank pieces, stored pallets <br /> T 408.548.5050 967 Mabury Road:,San Jose,CA 95133 Page I of 10 .. <br /> F 408.548.5052 www.ACTenviro.com <br />