UPDATE Topics 1. Timeline 2. Scope of This Effort 3. Master Plan - - PowerPoint PPT Presentation

UPDATE

December 13, 2017

Topics

• 1. Timeline
• 2. Scope of This Effort
• 3. Master Plan Findings
• 4. Next Steps

Timeline

Timeline of the Master Plan and Related Efforts

Date Item 7/2008, 7/2009, 2/2010 Dates of prior Wastewater Master Plan (WWMP) and prior updates to the master plan (author: HDR) 2011 Ione indicates that it may invoke five-year cancellation clause 11/2011 HydroScience awarded WWMP update contract through competitive process 11/2012 Draft WWMP update submitted 6/2014 Multi-Regional Recycling Feasibility Study with Ione & CDCR initiated 8/2016 Multi-Regional Recycling Feasibility Study with Ione & CDCR completed 4/2017 This WWMP update initiated 7/2017 Ione invokes five-year cancellation clause 12/2017 Draft WWMP update submitted

Scope of This Effort

Scope of This Effort

• Update the 2012 WWMP with new information on

flows, growth, and water balances and bring in the results of the Multi-Regional Study

• Compare Multi-Regional approach to “stand-

alone” alternatives (elimination of storage and disposal downstream of Henderson)

• Address Henderson Reservoir change – can now

repair and keep in service

• Compare based on cost and non-cost factors
• Provide a recommendation and Capital

Improvement Plan (CIP)

Scope Limitations

• No updating of TM 3B– changes to surface water

discharge requirements not significant to overall picture

• Reconsider risks and costs of surface water

discharge option

• Rely on prior WWTP condition assessment

information

Changes During Effort

• Ione invoked five-year cancellation clause and

indicated no further interest in multi-regional solution

• Stand-alone alternatives are now the only feasible

alternatives

Master Plan Findings

Report Outline

• TM 1: Evaluation of Existing Facilities
• TM 2: Flow Projections
• TM 3: Initial Evaluation and Screening Options
• TM 4: Alternatives Analysis
• TM 5: Capital Improvement Plan

Current WWTP Influent Flows

Existing Conditions Water Balance

Current

Existing Conditions Water Balance

Without Ione Disposal

Other Findings

• WWTP needs condition and capacity

improvements and/or facility replacements

• ARSA pipeline needs condition and capacity

improvements

• Collection system Infiltration/Inflow (I/I) would be

beneficial if cost-effective

• Sludge removal in Henderson would restore

capacity

Projected Flows

• Gold Rush Ranch (GRR)

– 18 hole course irrigated with recycled water – 1334 residential units – Develop over 25 years beginning in 2020 (assumption) – Uncertainty surrounding this development going forward or in what form

• Modest Population Growth in Service Area

Population Growth

25-Year Flow Projections

Flow Projection Findings

• Flows will exceed the current ADWF capacity of

the WWTP before 2036 without GRR and 2031 with GRR

• PDF will exceed wet weather capacity in 2021
• ARSA flow bottleneck of 2.0 MGD will be

exceeded in 2026

• ARSA storage and disposal capacity will be

exceeded

Surface Water Discharge Evaluation (TM 3B)

• TM 3B prepared in 2012 by RBI, still applies today
• Requires nutrient removal, Title 22 filtration, ultraviolet

disinfection

• Higher O&M cost: Grade III operator, maintenance,

energy, reporting, fines potential

• Dilution credit and seasonal discharge benefits limited
• Eliminates ARSA system and associated costs
• Ends reclamation practice unless portion diverted to new

recycled water users, difficult to divert from creek later

• High cost for permitting+studies, environmental, design
• Schedule uncertainty to complete these, urgency to

complete given cancellation clause

• Final effluent limitations uncertain until studies done
• Anti-degradation analysis is required; must evaluate

alternatives to surface water discharge

Alternatives Evaluated

Alternatives Evaluated

Alternative 1: ARSA Sprayfields

Alternative 2: Noble Ranch Sprayfields

Alternative 3: Surface Water Discharge

Alternative 4: ARSA Sprayfields and GRR Irrigation

Alternative 5: Surface Water Discharge and GRR Irrigation

Alternatives Analysis

Alternatives Analysis

Evaluation Findings

• Alt. 1 is more costly on a present worth basis than

Alt 3

• But, spending can be phased further out in time

than Alt 3, which must replace entire ARSA system when Ione goes offline (or interim measures taken)

• Alt 1 scores better than Alt 3 in non-economic

analysis

• Alt 1 uses a familiar and accepted disposal

strategy and can be adapted to future reuse of effluent

• The actual cost and timing of Alt 3 is less certain

Recommended Alternative: Alternative 1: ARSA Sprayfields

Potential sprayfield sites

• shown. Not all will be
• required. CIP based on

single site at similar elevation to Henderson.

Lower system not needed if sufficient acreage developed at Henderson

Treatment Upgrades

Capital Improvement Program

Capital Improvement Program

Capital Improvement Program

• Henderson sludge removal and initial sprayfields mitigates

loss of Ione disposal

• Engineering and permitting for Ione Canal begins in first 5

years period, construction in next

• WWTP costs potentially could be further spread out

Next Steps

Next Steps

• Updated WWTP assessment and preliminary

design of upgrades

• Ione Canal Reservoir geotechnical study,

preliminary design, CEQA, land acquisition

• Landowner coordination and agreements,

sprayfield development

• Phasing refinement and value engineering
• Seek low-interest loans and grants

Option: Recycled Water Feasibility Study

• Determine if sufficient market exists to sell higher

quality recycled water to local users and feasibility/cost of providing it

• Utilize flow projections, water balances, tertiary

treatment costs, and storage and disposal amounts from WWMP as basis

• Develop and evaluate tertiary reuse alternatives
• Compare to land disposal alternatives in the

WWMP

Option: Recycled Water Feasibility Study

• State Water Resources Control Board (SWRCB)

Water Recycling Funding Program (WRFP) Grant: up to $75,000 50/50 match

• Recycled Water Market Assessment
• Legal/Institutional Analysis
• Recycled Water Supply Analysis

Input and Direction

• Comments and questions on the analysis and

recommended alternative

• Finalize the WWMP
• Interest in recycled water market

assessment/study

End of Presentation