Sativa Water System Manganese Wellhead Treatment

1. Sativa Water SystemManganese Wellhead Treatment Los Angeles County Russ Bryden rbryden@dpw.lacounty.gov (626) 802-8611 mobile

2. Sativa Water SystemManganese Wellhead Treatment

3. Sativa Water SystemManganese Wellhead Treatment

4. DAC Status $44,349 State Water Board certifies Sativa Water System MHI = $44,349

5. Project Outreach • Outreach strategies used during planning • Community Meetings • Customer Newsletters • Media (newspaper, TV, radio, others) • Public feedback and if/how it was incorporated • Manganese is the believed to be the source of Sativa’s brown water. The community is aware of this and strongly wants the brown water addressed. • Project is located entirely within wellsite. No public access is permitted. • Planned long-term project messaging (e.g. website, on-site signage, infographics) • Onsite signage • Annual statement in Sativa’s Community Confidence Report

6. Funding Details Funding: • Total Project Cost = $2,250,000 • Matching Funds = $0 (DAC, MHI = 66% CA) • Grant Request = $2,250,000 • Matching Funds Sources = N/A • O&M costs per year = $25,000 per year ($93 / Acre Foot) Partners: • Water Replenishment District

7. Program Preferences Climate Change • Reduce greenhouse gases • Decrease demand for imported water and associated energy use • Without manganese removal, Sativa cannot serve groundwater and would be forced to rely on imported water Regional Water Self-Reliance • Allow Sativa to serve groundwater • Without manganese removal, Sativa cannot serve groundwater and would be forced to rely on imported water List Statewide Priorities Objectives • Provide Safe Water for All Communities • Provide all Californians the right to safe, clean, affordable and accessible water adequate for human consumption, cooking, and sanitary purposes • Provide funding assistance for vulnerable communities • Manage the supply status of community water systems Expected Useful Life • 30+ Years CEQA and Permit Completion • Done – Mitigated Negative Declaration completed November 2018

8. Benefits Problem / Issue to be Addressed • Manganese is believed to be the source of Sativa’s brown water issues • State Board has indicated that Sativa will receive a Compliance Order to address the manganese exceedances • Sativa's primary well has logged consistent exceedances of Secondary Drinking Water Quality Standards for manganese. • Manganese levels average 51 ug/L for the last 12 months • ~60+ ug/L for 9 months, ~30 ug/L for 3 months during the rainy season • Secondary Drinking Water Standard is 50 ug/L Describe physical benefits of the project • Remove up to 100% of manganese • Post treatment = 0ug/L to 25 ug/L How does project addresses critical need (s) of GLAC IRWM • Improves DAC access to clean, safe water • Keeps water service costs for a DAC from rising steeply • Project costs aren’t transferred to customers • If project not built, must switch to imported water

9. Estimated Budget

10. Project Schedule

11. Other Considerations