1. Chromium 6 Regulation Corrective Action Plan October 6, 2015

2. Topics of Discussion Why do we need a Corrective Action Plan?
Details of Corrective Action Plan (CAP)
Relationship to Water Supply Master Plan

3. Corrective Action Plan (CAP) Hexavalent Chromium (Chrome 6)
Reminder about why it is needed
As presented on September 2nd, the State’s Division of Drinking Water (DDW) issued Compliance Order on July 29, 2015
It requires Patterson to develop a Corrective Action Plan (CAP) as “roadmap” to achieve Chrome 6 compliance
CAP submittal due date to DDW: October 9, 2015

4. Overview of CAP Major steps identified (10) explained next
Description for each
Estimated order of magnitude costs
Increasing cost uncertainty for steps farther out on timeline due to greater number of unknowns
Time requirement for each. Total time: 66 months.

5. Corrective Action Plan (CAP) Hexavalent Chromium (Chrome 6)
Step 1: Field Testing of Wells
Purpose:
Determine if limiting well pumping to certain depths can reduce Chrome 6 concentration in source water
If Chrome 6 reductions achievable, determine impacts (if any) to well production capacity
Order of magnitude cost: Approx. $25,000
Estimated Time Required: 2 months

6. Corrective Action Plan (CAP) Hexavalent Chromium (Chrome 6)
Step 2: Feasibility Study
Purpose:
Screen candidate alternatives on conceptual level to determine most suitable potential solution(s)
Variables in screening analysis:
Technologies (Weak Based Anion Exchange, Strong Based AnionExchange, Reduction/Coagulation/Filtration, possible Reverse Osmosis)
Treatment capacity/expansion; other water quality goals
Facility site alternatives and conveyance pipeline alignments
Capital and O&M costs
Order of magnitude cost: Approx. $200,000
Estimated Time Required: 6 months

7. Corrective Action Plan (CAP) Hexavalent Chromium (Chrome 6)
Step 3: Pilot Testing
Purpose:
Evaluate recommended technologies from Feasibility Study treating Patterson groundwater
Develop Patterson specific design criteria
Refine capital and O&M costs
Determine treatment technology to recommend going forward
Order of magnitude cost: Approx. $400,000
Cost dependent on number of technologies and conditions required to evaluate
Estimated Time Required: 8 months

8. Corrective Action Plan (CAP) Hexavalent Chromium (Chrome 6)
Step 4: Basis of Design Report
Purpose:
Develop conceptual design of final recommended:
treatment system using design criteria from pilot testing
conveyance pipeline alignments
Revise Capital and O&M costs to be used for grant funding/loan applications
Order of magnitude cost: Approx. $200,000
Estimated Time Required: 6 months

9. Corrective Action Plan (CAP) Hexavalent Chromium (Chrome 6)
Step 5: Engineering Design
Purpose:
Develop project documents (i.e., plans and specifications) to allow bid and construction of treatment system and pipelines
Design milestones:
30%, 60%, 90%, and 100% for review, with final bid set approved by DDW
Order of magnitude cost: Approx. $1,000,000
Cost is highly dependent on recommended treatment process, facility configuration, and conveyance pipeline alignments
Estimated Time Required: 15 months

10. Corrective Action Plan (CAP) Hexavalent Chromium (Chrome 6)
Step 6 & 7: CEQA and Permitting
Purpose: Required to identify and mitigate environmental impacts and obtain permits to implement the project
Initial Study/Mitigated Negative Declaration (IS/MD) or Environmental Impact Report (EIR) will be required
Document type to be determined during Basis of Design Report
Order of magnitude cost: $200,000 - $400,000
Cost dependent on whether IS/MD or EIR is required
Estimated Time Required: up to 18 months
Performed in parallel with Basis of Design Report through Engineering Design

11. Corrective Action Plan (CAP) Hexavalent Chromium (Chrome 6)
Step 8: Funding/Financing
Purpose:
Application for grant funds and/or State Revolving Fund (SRF) loans to offset Chrome 6 treatment facility costs
Order of magnitude cost: $30,000 - $50,000 per application
Estimated Time Required: 12 months
Grant and SRF loan application process to be conducted in parallel with Engineering Design

12. Corrective Action Plan (CAP) Hexavalent Chromium (Chrome 6)
Step 9: Construction
Purpose:
Construction of Chrome 6 treatment facility and required conveyance pipelines
Order of magnitude cost:
Cannot estimate given too many unknowns at this time. Cost expected to be in the millions range
Estimated Time Required: 27 months
Includes 3 months to bid and award project; 24 months for construction

13. Corrective Action Plan (CAP) Hexavalent Chromium (Chrome 6)
Step 10: Commissioning/Acceptance
Purpose:
Treatment facility startup and acceptance of Chrome 6 compliance by DDW
Order of magnitude cost:
Dependent on DDW requirements following completion of treatment facility construction
Estimated Time Required: 2 months

14. Relationship with Water Master Plan
Master plan objective: identify projects to continue to have a safe, reliable, supply in the future
New supply sources and groundwater recharge being evaluated – in addition to groundwater options
Capital Improvements Projects will be defined in Mid-December
Chrome 6 projects may be linked or consolidated with other master plan projects
Presentations to Council: November 2015, February 2016

15. Recommendation
Approve Chromium 6 Corrective Action Plan (CAP) to be submitted to the State Water Resources Control Board, Division of Drinking Water in Compliance with Compliance Order No. 01_10_15R_001

16. Questions?