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Page 1 of 10 <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@sjgov.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 1 - Tank Summary <br />Tank # Tank Contents Description # of <br />Pallets <br />Pallet # # pH <br />samples <br />Measured <br />pH range <br />Tank A Diatomaceous Earth Post Filter <br />Tank <br />1 A1-1 (5) per <br />pallet <br />7-8 <br />Tank B Sodium Hydroxide Post Filter <br />Tank <br />3 B1-1-3 (5) per <br />pallet <br />7-8 <br />Tank C Hydrochloric Acid Post Filter <br />Tank <br />10 C1-1-10 (5) per <br />pallet <br />7-8 <br />Tank D Sodium Hypochlorite Post Filter <br />Tank <br />5 D1-1-5 (5) per <br />pallet <br />7-8 <br />Figure 1 (below) shows the tank pieces, stored pallets