Arsenic Lisa Miller Water Quality Engineer Golden State Water Company Back to the Basics: Challenges and Solutions for Small Systems/Groundwater Treatment Arsenic Lisa Miller Water Quality Engineer Golden State Water Company Thank you for tuning in. The presentation will begin soon. Good morning. Welcome to a question and answer session on plans for a new water utility leadership certificate program.

Agenda Arsenic Overview Federal MCL & State MCL BAT Artesia System overview & wells affected by arsenic Types of treatment utilized Coagulation/filtration Adsorptive Media Challenges & Issues Pilot Studies Hopefully you are hearing and seeing this presentation just fine. I have your audio in “muted” mode right now. If you are not familiar with the GoTo webinar experience, you should see a box in the upper right corner of your screen. That’s where you’ll find some controls. You can open or collapse this box using the horizontal arrow. You will also find a chat box, which you can use to submit questions during the presentation. So let’s forge ahead, we have quite a few questions to cover.

Arsenic in California Federal MCL – 10 µg/L Effective January 2006 California MCL – 10 µg/L Effective November 2008 Health Effects include cancer, skin damage, circulatory problems, etc. Natural and manmade sources Hopefully you are hearing and seeing this presentation just fine. I have your audio in “muted” mode right now. If you are not familiar with the GoTo webinar experience, you should see a box in the upper right corner of your screen. That’s where you’ll find some controls. You can open or collapse this box using the horizontal arrow. You will also find a chat box, which you can use to submit questions during the presentation. So let’s forge ahead, we have quite a few questions to cover.

Arsenic in California Arsenite (As III) vs. Arsenate (As V) Arsenate more readily removed Arsenite can be converted to arsenate by the addition of an oxidant Hopefully you are hearing and seeing this presentation just fine. I have your audio in “muted” mode right now. If you are not familiar with the GoTo webinar experience, you should see a box in the upper right corner of your screen. That’s where you’ll find some controls. You can open or collapse this box using the horizontal arrow. You will also find a chat box, which you can use to submit questions during the presentation. So let’s forge ahead, we have quite a few questions to cover.

Arsenic in California Best Available Technology Activated Alumina Coagulation/Filtration* Ion Exchange Lime Softening* Reverse Osmosis Electrodialysis Oxidation/Filtration Hopefully you are hearing and seeing this presentation just fine. I have your audio in “muted” mode right now. If you are not familiar with the GoTo webinar experience, you should see a box in the upper right corner of your screen. That’s where you’ll find some controls. You can open or collapse this box using the horizontal arrow. You will also find a chat box, which you can use to submit questions during the presentation. So let’s forge ahead, we have quite a few questions to cover. *Not BAT for system <500 service connections

Artesia System 10,827 service connections 48,308 population Groundwater System Seven active wells, three with arsenic treatment Co-occurring contaminants Manganese and/or Iron Hopefully you are hearing and seeing this presentation just fine. I have your audio in “muted” mode right now. If you are not familiar with the GoTo webinar experience, you should see a box in the upper right corner of your screen. That’s where you’ll find some controls. You can open or collapse this box using the horizontal arrow. You will also find a chat box, which you can use to submit questions during the presentation. So let’s forge ahead, we have quite a few questions to cover.

Coagulation/Filtration Centralia Well #6 Plant effluent arsenic: 5-6 µg/L Hopefully you are hearing and seeing this presentation just fine. I have your audio in “muted” mode right now. If you are not familiar with the GoTo webinar experience, you should see a box in the upper right corner of your screen. That’s where you’ll find some controls. You can open or collapse this box using the horizontal arrow. You will also find a chat box, which you can use to submit questions during the presentation. So let’s forge ahead, we have quite a few questions to cover.

Coagulation/Filtration Treatment process involves co-precipitation and adsorption/filtration of iron, manganese, and arsenic Sodium hypochlorite and ferric chloride are injected into raw water Dual media anthracite/sand filters Hopefully you are hearing and seeing this presentation just fine. I have your audio in “muted” mode right now. If you are not familiar with the GoTo webinar experience, you should see a box in the upper right corner of your screen. That’s where you’ll find some controls. You can open or collapse this box using the horizontal arrow. You will also find a chat box, which you can use to submit questions during the presentation. So let’s forge ahead, we have quite a few questions to cover.

Coagulation/Filtration Centralia Well #6 Design Capacity 2000 gpm 3 gpm/ft² Filtration rate Ferric chloride dose: ~4-6 mg/L 10 year Media life Hopefully you are hearing and seeing this presentation just fine. I have your audio in “muted” mode right now. If you are not familiar with the GoTo webinar experience, you should see a box in the upper right corner of your screen. That’s where you’ll find some controls. You can open or collapse this box using the horizontal arrow. You will also find a chat box, which you can use to submit questions during the presentation. So let’s forge ahead, we have quite a few questions to cover.

Coagulation/Filtration Filters are backwashed every 24 hours of run time Backwash water allowed to settle Decant is recycled to head works Hopefully you are hearing and seeing this presentation just fine. I have your audio in “muted” mode right now. If you are not familiar with the GoTo webinar experience, you should see a box in the upper right corner of your screen. That’s where you’ll find some controls. You can open or collapse this box using the horizontal arrow. You will also find a chat box, which you can use to submit questions during the presentation. So let’s forge ahead, we have quite a few questions to cover.

Treatment Considerations Waste Disposal considerations Sludge Hauling Hazardous waste characterization Sewer connection Hopefully you are hearing and seeing this presentation just fine. I have your audio in “muted” mode right now. If you are not familiar with the GoTo webinar experience, you should see a box in the upper right corner of your screen. That’s where you’ll find some controls. You can open or collapse this box using the horizontal arrow. You will also find a chat box, which you can use to submit questions during the presentation. So let’s forge ahead, we have quite a few questions to cover.

Pilot Studies Centralia Wells 3 & 4 Advanced Processes for Simultaneous Arsenic and Manganese Removal (2006 AwwaRF Tailored Collaboration Project) Purpose was to modify, demonstrate and optimize an existing treatment process to simultaneously remove As and Mn Establish efficient design process approach for utilities Hopefully you are hearing and seeing this presentation just fine. I have your audio in “muted” mode right now. If you are not familiar with the GoTo webinar experience, you should see a box in the upper right corner of your screen. That’s where you’ll find some controls. You can open or collapse this box using the horizontal arrow. You will also find a chat box, which you can use to submit questions during the presentation. So let’s forge ahead, we have quite a few questions to cover.

Pilot Studies Determined that ferric chloride could be added to oxidation/filtration to successfully remove arsenic Ferric chloride doses between 2 and 4 mg/L could reduce arsenic down to 8 µg/L, and higher doses could bring arsenic to ND levels Hopefully you are hearing and seeing this presentation just fine. I have your audio in “muted” mode right now. If you are not familiar with the GoTo webinar experience, you should see a box in the upper right corner of your screen. That’s where you’ll find some controls. You can open or collapse this box using the horizontal arrow. You will also find a chat box, which you can use to submit questions during the presentation. So let’s forge ahead, we have quite a few questions to cover.

Adsorptive Media Hawaiian Well #1 and Massinger Well #1 Plant effluent arsenic: typically ND Hopefully you are hearing and seeing this presentation just fine. I have your audio in “muted” mode right now. If you are not familiar with the GoTo webinar experience, you should see a box in the upper right corner of your screen. That’s where you’ll find some controls. You can open or collapse this box using the horizontal arrow. You will also find a chat box, which you can use to submit questions during the presentation. So let’s forge ahead, we have quite a few questions to cover.

Adsorptive Media Oxidation/filtration through pyrolusite media Followed by Granular Ferric Oxide adsorption for arsenic removal Hopefully you are hearing and seeing this presentation just fine. I have your audio in “muted” mode right now. If you are not familiar with the GoTo webinar experience, you should see a box in the upper right corner of your screen. That’s where you’ll find some controls. You can open or collapse this box using the horizontal arrow. You will also find a chat box, which you can use to submit questions during the presentation. So let’s forge ahead, we have quite a few questions to cover.

Adsorptive Media Hawaiian Well #1 and Massinger Well #1 both 600 gpm each 8 gpm/ft² filtration rate GFO media does not need to be backwashed Hopefully you are hearing and seeing this presentation just fine. I have your audio in “muted” mode right now. If you are not familiar with the GoTo webinar experience, you should see a box in the upper right corner of your screen. That’s where you’ll find some controls. You can open or collapse this box using the horizontal arrow. You will also find a chat box, which you can use to submit questions during the presentation. So let’s forge ahead, we have quite a few questions to cover.

Treatment Considerations GFO is single-pass media Waste Disposal considerations – spent media disposal Media life – lack of bed volumes Hopefully you are hearing and seeing this presentation just fine. I have your audio in “muted” mode right now. If you are not familiar with the GoTo webinar experience, you should see a box in the upper right corner of your screen. That’s where you’ll find some controls. You can open or collapse this box using the horizontal arrow. You will also find a chat box, which you can use to submit questions during the presentation. So let’s forge ahead, we have quite a few questions to cover.

Pilot Studies Hawaiian & Massinger treatment alternatives Modifications to the existing adsorption system Hydraulic improvements Vessel cycling Lead-lag vessel configuration pH depression Other adsorptive medias Hopefully you are hearing and seeing this presentation just fine. I have your audio in “muted” mode right now. If you are not familiar with the GoTo webinar experience, you should see a box in the upper right corner of your screen. That’s where you’ll find some controls. You can open or collapse this box using the horizontal arrow. You will also find a chat box, which you can use to submit questions during the presentation. So let’s forge ahead, we have quite a few questions to cover.

Pilot Studies Hawaiian & Massinger treatment alternatives Modifications to existing oxidation filtration system Ferric Chloride addition Residuals Handling pH depression Piloted addition of ferric chloride prior to manganese dioxide filters to simultaneously remove manganese and arsenic to eliminate need for GFO Hopefully you are hearing and seeing this presentation just fine. I have your audio in “muted” mode right now. If you are not familiar with the GoTo webinar experience, you should see a box in the upper right corner of your screen. That’s where you’ll find some controls. You can open or collapse this box using the horizontal arrow. You will also find a chat box, which you can use to submit questions during the presentation. So let’s forge ahead, we have quite a few questions to cover.

Pilot Studies Century Well #1 AwwaRF Demonstration of Emerging Technologies for Arsenic Removal, Volume 2: Pilot Testing Tested 4 different types of adsorptive media Aluminum-based sorbent Granular ferric hydroxide Iron-coated activated alumina High porosity granular activated alumina Hopefully you are hearing and seeing this presentation just fine. I have your audio in “muted” mode right now. If you are not familiar with the GoTo webinar experience, you should see a box in the upper right corner of your screen. That’s where you’ll find some controls. You can open or collapse this box using the horizontal arrow. You will also find a chat box, which you can use to submit questions during the presentation. So let’s forge ahead, we have quite a few questions to cover.

Pilot Studies Conclusions from Century Testing Iron-based media has greater capacity for removing arsenic than alumina media GFH performed better because of higher iron content GFH treated higher volumes of water before breakthrough Hopefully you are hearing and seeing this presentation just fine. I have your audio in “muted” mode right now. If you are not familiar with the GoTo webinar experience, you should see a box in the upper right corner of your screen. That’s where you’ll find some controls. You can open or collapse this box using the horizontal arrow. You will also find a chat box, which you can use to submit questions during the presentation. So let’s forge ahead, we have quite a few questions to cover.

Conclusion Coagulation/Filtration successfully removes arsenic, iron, and manganese in one treatment process. Produces waste residuals. Adsorption is a straightforward process to remove arsenic. Media is typically single pass. Type of treatment and success of treatment can vary depending on site specific factors and source water quality. Pilot testing helps determine what will work best for each plant site. Hopefully you are hearing and seeing this presentation just fine. I have your audio in “muted” mode right now. If you are not familiar with the GoTo webinar experience, you should see a box in the upper right corner of your screen. That’s where you’ll find some controls. You can open or collapse this box using the horizontal arrow. You will also find a chat box, which you can use to submit questions during the presentation. So let’s forge ahead, we have quite a few questions to cover.

Thank You Gswater.com | 800.999.4033 @GoldenStateH2O Lisa.Miller@gswater.com 562-907-9200 Gswater.com | 800.999.4033 @GoldenStateH2O