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Photo 4-Looking north at the three 230 gallon polyethylene pH mixing tanks (T3,T4 and T5). Visual Inspection Notes- During the time of inspection the tanks all contained liquid. Active processing was ongoing and waste water was being drained in to the capture tanks. It was being actively mixed and pumped during the visit. As waste water enters the system, the capture tanks fill up to a point of roughly 309 gallons or 99 percent capacity, at which point an automatic float pump is activated. This triggers the internal pump to begin sending the captured waste water to the pH mixing tanks where it is treated and then released to the storm drain system. The capture tanks (T1 and T2) are only on during business hours and also have an alarm system to notify if they are not working. Further, if overflow is to occur into the secondary holding, a sump pump would be activated and the water would be removed and placed back into the system. T1 is the primary tank in use. T2 is only rarely used and acts as a back-up for times when more capacity is needed_ and for future expansion or use change. ■ No visual leakage was observed from the openings or fittings around the tank. ■ The interior and exterior surfaces were clean and free of leakage. ■ The nozzles, piping, gauges, and valves were free of leakage and were in good condition. Thank you, Garrett Backus,Ld.Sr.REHS,CUPA programs San Joaquin County Environmental Health Department 1868 E Hazelton Ave,Stockton,CA 95205 (209)468-2986 gbackusna siaoyorg hftps,//www.s'aov.ora/departmentlenvhealth/ Please note my email has changed. SANiJUAQUIN COUNTY Greatness grows here. From:Chris Colbert<ccolbert(@Iustrecal.com> Sent:Monday,April 29,2019 4:55 PM To:Backus,Garrett<gbackus(@sjgov org> Ce:Muro,Claudia<cmuro(@sigov.org> Subject:RE:Hazardous Waste Inspection Report-treatment Hi Garret, Thank you for the confirmation. Please seethe attached assessment of the hazardous waste treatment and storage tanks. Best Regards, Chris Colbert Vice President Operations Lustre-Cal Corporation (209)370-1600 Main http://www.lustrecal.com From:Backus,Garrett<gbackusPsjgov^ore> Sent:Thursday,April 18,2019 3:31 PM To:Chris Colbert<ccolbert(allustrecal.com> Cc:Muro,Claudia<cmuro(@sjgov.ore> Subject:RE:Hazardous Waste Inspection Report-treatment Hi Chris, I reviewed and accepted the CERS submittal. The only open violations remaining from our 1-25-19 inspection are for the tank assessment of the hazardous waste treatment and storage tanks.