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Alaniz, John <br /> From: Lon Kitagawa <LKitagawa@aascworld.com> <br /> Sent: Wednesday,January 29, 2020 11:23 AM <br /> To: Alaniz, John <br /> Subject: RE: 1-27-2020 HW MANIFEST <br /> John: <br /> Here's info from their website regarding the ISS-850: <br /> "A patented line of metal precipitation products that deliver the reducing power of iron and the metals precipitation <br /> capacity of sulfide in a safe, insoluble form.lnsolmet delivers the metal reduction and precipitation properties of iron and <br /> sulfide via micro- and nano- dispersed slurries of iron sulfide, blended with other proprietary ingredients. Because of their <br /> super small size, the iron sulfide particles are able to reduce and react with metals while still remaining in the solid <br /> phase. In most cases, Insolmet eliminates the need for a secondary coagulant and offsite treatment and disposal of hard <br /> to treat metal concentrates." <br /> Lon <br /> From: Alaniz, John [mailto:jalanizl@sjgov.org] <br /> Sent: Wednesday, January 29, 2020 8:44 AM <br /> To: Lon Kitagawa <br /> Subject: RE: 1-27-2020 HW MANIFEST <br /> Hi Lon, <br /> Thank you for the information. We were trying to make sure that the treatment was following the regulation listed <br /> below. <br /> 67450.11(a) <br /> (1)Aqueous wastes containing hexavalent chromium may be treated by the following process: <br /> (A) Reduction of hexavalent chromium to trivalent chromium with sodium bisulfite, sodium metabisulfite, sodium <br /> thiosulfate,ferrous sulfate,ferrous sulfide or sulfur dioxide, provided both pH and addition of the reducing agent are <br /> automatically controlled. <br /> The SDS does not say which chemical ingredient from above is being used. <br /> John <br /> From: Lon Kitagawa [mailto:LKitagawa@aascworld.com] <br /> Sent:Wednesday,January 29, 2020 8:33 AM <br /> To:Alaniz,John <jalanizl@sjgov.org> <br /> Subject: RE: 1-27-2020 HW MANIFEST <br /> John: <br /> I've attached the SDS for the reducing agent. <br /> Control of the pH is based on pH probe readings and additions are automatically made by pumps from sulfuric <br /> acid or caustic soda drums. The addition of the ISS-850 is based on readings from an ORP probe. The pump <br /> from the ISS-850 mixing tank is manually turned on and additions are made until the appropriate ORP is <br /> reached. Then the pump is manually turned off. <br /> i <br />