WEF presentation1

Slide 1: 

Regional Approach to Maximize Reuse Opportunities in North San Diego County September 8, 2011 Water Education Foundation – San Diego Tour Mitch Dion Rincon del Diablo Municipal Water District General Manager

Overview of Presentation: 

Overview of Presentation Participating Agencies Goals of the Project Available Recycled Water Supplies Potential Recycled Water Demands Long-Term (2030) Regional Options Short-Term (2020) Projects Recommendations/Next Steps

Study Area / Location Map: 

Study Area / Location Map San Diego County Carlsbad Encinitas Solano Beach San Marcos Escondido Oceanside Vista

Participating North County Agencies: 

Participating North County Agencies WATER AGENCIES WASTEWATER AGENCIES Carlsbad Municipal Water District (City) City of Carlsbad City of Escondido City of Escondido City of Oceanside City of Oceanside Vallecitos Water District Vallecitos Water District San Dieguito Water District (City) City of Encinitas Vista Irrigation District Buena Sanitation District (City of Vista) Olivenhain Municipal Water District Leucadia Wastewater District Santa Fe Irrigation District San Elijo Joint Powers Authority Rincon del Diablo Municipal Water District Camp Pendleton (Pending)

Wastewater Agencies (7): 

Wastewater Agencies (7)

Water Agencies (8): 

Water Agencies (8)

Project Goals: 

Project Goals Investigate opportunities for expanded use of Recycled Water Involve multiple agencies from North County Document effort in Facility Plan Report to use for pursuit of local, State, and Federal funding opportunities

Scope of Planning Study: 

Scope of Planning Study Compare supplies with projected demands Consider regulatory requirements Develop regional concepts to expand use of RW Utilize existing systems Seasonal Storage Groundwater IPR Reservoir Augmentation IPR Prepare Recycled Water Facility Plan Long-Term (2030) Short-Term (2020)

Regulatory Considerations: 

Regulatory Considerations Hydrologic Units/Subunits TDS Limits

Current Recycled Water Setting: 

Current Recycled Water Setting Available Recycled Water Supplies Potential Non-Potable Water Demands Existing Recycled Water Systems Planned Recycled Water Systems

Projected Wastewater Flow: 

Projected Wastewater Flow Agency WWTP Wastewater Flow (MGD) 2010 2020 2030 1.Joint Powers Encina WPCF 25.0 34.0 40.0 2.Escondido Hale Ave RRF 13.0 21.0 25.0 3.Oceanside La Salina WWTP 3.0 3.0 3.0 4.Oceanside San Luis Rey WWTP 9.7 9.7 12.5 5.Joint Powers San Elijo WRF 3.1 3.1 3.1 6.Vallecitos Meadowlark WRF 3.7 4.5 4.5 7.Rincon Harmony Grove WRP -- 0.2 0.2 8.Buena San Shadowridge WRP -- 2.0 2.0 TOTAL (MGD) 57.5 77.5 90.3 TOTAL (AFY) 64,400 86,800 101,100

Planned Recycled Water Production: 

Planned Recycled Water Production Agency Treatment Plant Tertiary Capacity (MGD) 2010 2020 2030 1.Carlsbad Carlsbad WRP 4.0 9.0 12.0 2.Leucadia Gafner WRP 1.0 2.0 3.7 3.Escondido Hale Ave RRF 9.0 18.0 20.0 4.Vallecitos Meadowlark WRF 5.0 5.0 5.0 5.JPA San Elijo WRF 2.5 3.0 3.0 6.Oceanside San Luis Rey WWTP 0.7 3.2 7.5 7.Rincon Harmony Grove WRP -- 0.2 0.2 8.Buena San Shadowridge WRP -- 2.0 2.0 TOTAL TERTIARY CAPACITY (MGD) 22.2 42.2 53.4 TOTAL TERITARY CAPACITY (AFY) 24,900 47,300 59,800 TOTAL WASTEWATER FLOW (AFY) 64,400 86,800 101,100

Existing Recycled Water Use: 

Agency Average Annual Recycled Water Demand (afy) Total Carlsbad MWD 4,937 City of Escondido 771 City of Oceanside 119 Olivenhain MWD 1,000 Rincon Del Diablo MWD 3,279 San Dieguito Water District 700 Santa Fe Irrigation District 510 Vallecitos Water District -- Vista Irrigation District -- Total 11,316 (18%) Wastewater Flow 64,400 Existing Recycled Water Use

Build on Current Efforts: 

Existing Recycled Water Systems Build on Current Efforts

Build on Current Efforts: 

Planned Recycled Water Systems Build on Current Efforts

Potential Recycled Water Demand: 

Potential Recycled Water Demand Agency Average Annual Demand (afy) Existing Additional Short-Term Total by 2020 * Additional Long-Term Total by 2030 * Carlsbad MWD 4,937 3,040 7,977 760 8,737 City of Escondido 771 3,250 4,021 8,000 * 12,021 City of Oceanside 119 1,580 1,699 2,057 3,756 Olivenhain MWD 1,000 600 1,600 -- 1,600 Rincon Del Diablo MWD* 3,279 4,000 * 7,279 2,000 * 9 ,279 San Dieguito Water District 700 -- 700 -- 700 Santa Fe Irrigation District 510 800 1,310 -- 1,310 Vallecitos Water District -- 1.444 1,444 922 2,366 Vista Irrigation District -- 1,840 1,840 1,210 3,050 Totals 11,316 (18%) 14,554 27,870 (32%) 14,949 42,819 (42%) Wastewater Flow 64,400 86,800 101,100 * Includes Indirect Potable Reuse demand

Regional Long Term (2030) Options: 

Regional Long Term (2030) Options Option A: Decentralized Supply Use satellite WPRs Option B: Centralized Supply Utilize central/larger WWTP/WPRs Option C: Seasonal Storage 7 potential sites identified Option D: Indirect Potable Reuse (IPR) Groundwater Surface Water Augmentation

Option A: Decentralized Supply – Matching with demand : 

Option A: Decentralized Supply – Matching with demand Agency Additional Recycled Water Demand (afy) Avg. Annual Recycled Water Supply (afy) San Luis Rey Shadowridge Carlsbad HARRF Gafner Meadowlark San Elijo Harmony Grove Community SD Carlsbad 3,800 2,800 600 400 Escondido 11,300 11,300 Oceanside 3,600 3,000 600 Olivenhain 600 200 100 300 Rincon 6,000 5,800 200 Santa Fe 800 500 300 Vallecitos 2,400 1,500 900 Vista 3,100 700 1,200 1,100 TOTAL 31,600 3,700 1,200 4,500 18,600 800 1,300 600 200 600

Option B: Centralized Supply – Matching with demand : 

Option B: Centralized Supply – Matching with demand Agency Additional Recycled Water Demand (afy) Avg. Annual Recycled Water Supply (afy) San Luis Rey Shadowridge Carlsbad HARRF Gafner Meadowlark San Elijo Harmony Grove Community SD Carlsbad 3,800 3,800 Escondido 11,300 11,300 Oceanside 3,600 3,600 Olivenhain 600 500 100 Rincon 6,000 5,800 200 Santa Fe 800 800 Vallecitos 2,400 2,400 Vista 3,100 700 2,400 TOTAL 31,600 3,700 0 6,700 19,500 0 0 900 200 0

Decentralized versus Centralized - Selection Criteria: 

Decentralized versus Centralized - Selection Criteria Maximize Reuse System Reliability Adaptability Institutional Complexity Proximity of Supplies and Demands

Decentralized versus Centralized - Evaluation Results: 

Decentralized versus Centralized - Evaluation Results o Option A: Decentralized Preferred

Regional Long Term Option A: Decentralized Approach: 

Regional Long Term Option A: Decentralized Approach

Long Term (2030) Option A Costs: 

Long Term (2030) Option A Costs ITEM UNITS Regional Capital Costs $ 598,000,000 Regional O&M Costs $ 9,485,000 / year Additional Recycled Water Use 31,500 AFY Regional Unit Costs $1,270 / AFY

Option C - Seasonal Storage: 

Figure 4-5 Seasonal Non-Potable Recycled Water Demand Balanced with Wastewater Supply Option C - Seasonal Storage

Potential Surface Storage Sites: 

Potential Surface Storage Sites Site Est. Capacity Notes Whalen Lake 500 af Could be environmentally sensitive Windmill Lake 500 af Portion within Camp Pendleton Guajome Lake 500 af Currently used for flood control North Broadway 2,200 af Distant from region, owned by County Calavera Lake 500 af Currently used for flood control Squires Reservoir 1,100 af Owned by Carlsbad, previously studied South Lake 500 af Owned by Vallecitos, previously studied Lake San Marcos Unknown WQ issues, limited water level change Box Canyon Unknown Little known about site San Dieguito Reservoir 850 af Currently used for potable water storage

Slide 26: 

North Broadway (2,200 af) South Lake (500 af) Option A with Seasonal Storage Sites Squires Reservoir (1,100 af)

Option D: Indirect Potable Reuse: 

Option D: Indirect Potable Reuse Site Type Est. Capacity Notes Mission Basin Groundwater 10,000 af High TDS, e xisting desalter Daily Ranch Surface 17,000 af Pot. Environmentally sensitive Lake Wohlford Surface 7,000 af Limited retention time Lake Dixon Surface 2,600 af Limited retention time San Marcos Basin Groundwater 4,600 af High TDS and nitrates Harmony Grove Groundwater 4,000 af High nitrates San Dieguito Basin Groundwater 4,500 af High TDS

Slide 28: 

Mission Basin (10,000 af) San Dieguito Basin (4,500 af) San Marcos Basin (4,600 af) Lake Wohlford (7,000 af) Option A with Indirect Potable Reuse Sites

Slide 29: 

Option A with Seasonal Storage and IPR Sites Mission Basin (10,000 af) North Broadway (2,200 af) San Dieguito Basin (4,500 af) San Marcos Basin (4,600 af) South Lake (500 af) Squires Reservoir (1,100 af) Lake Wohlford (7,000 af)

Short Term (2020) Projects – Matching with demand : 

Short Term (2020) Projects – Matching with demand Agency Additional Recycled Water Demand (afy) Avg. Annual Recycled Water Supply (afy) San Luis Rey Shadowridge Carlsbad HARRF Gafner Meadowlark San Elijo Harmony Grove Community SD Carlsbad 3,000 2,800 200 Escondido 3,300 3,300 Oceanside 1,600 1,000 600 Olivenhain 600 200 100 300 Rincon 4,000 3,800 200 Santa Fe 800 500 300 Vallecitos 1,400 600 800 Vista 1,800 700 1,100 TOTAL 16,500 1,000 700 4,500 7,700 400 800 600 200 600 Long Term (2030) 31,600 3,700 1,200 4,500 18,600 800 1,300 600 200 600

Short-Term (2020) Projects : 

Short-Term (2020) Projects

Short Term (2020) Project Costs: 

Short Term (2020) Project Costs ITEM UNITS Regional Capital Costs $ 336,000,000 Regional O&M Costs $ 4,260,000 / year Additional Recycled Water Use 16,500 AFY Regional Unit Costs $1,290 / AFY

Recommendations: 

Additional study on seasonal storage sites Additional study on IPR sites Agencies to update individual planning for consistency with regional plan Hydraulic analysis of regional system Develop or refine existing inter-agency agreements Consider programmatic type environmental document for regional project Recommendations

Current Status: 

Current Status Approved for $1.5 million to be included in San Diego regional grant application to State Agencies began Federal lobbying funding efforts Currently updating Regional Approach to include Camp Pendleton