Rancho Murieta Community Services District Next Steps Utilizing

Rancho Murieta Community
Services District
Next Steps Utilizing Recycled Water
General District Information
General District Information
Wastewater: Water that has been used for washing and sanitary use, received through the sewer collection system to the Wastewater Plant.
Recycled Water: District’s Wastewater that has been treated by biological action filtration and disinfection to
treated by biological action, filtration, and disinfection to a point that is safe for Title 22 irrigation use.
Phase 1: Estimated Level of Development in District for 671 additional connections; 620 residential, 50 commercial, and 1 park connections (aka 670)
Phase 2: Estimated Level of Development in District to
Phase 2: Estimated Level of Development in District to include 1,029 additional connections.
Buildout: Point at which connections to District are maximized at around 4,348 connections.
Steps bringing us to this point
Steps bringing us to this point
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2007 Wastewater Expansion & Financing Plan, HSE
2008‐9 District Reviewed possibility of seasonal discharge to the River with an NPDES Permit; Decided it was too costly and wasted an available resource
2010 IWMP Update; identified Recycled water as option to offset potable water use
2011 Board adopted Recycled Water Policy 2011‐07
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2012 Ordinance No. 2011‐05, Adding Chap.17 to the District Code establishing policies and regulation of the installation, connection and use of the District Recycled Water System
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2012 Developed Recycled Water Code
2012 Title 16 Feasibility Study
2013 Developed and adopted Recycled Water Standards
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2013 Title 22 Engineering Report for DDW (formerly CDPH)
2013‐14 Report of Waste Discharge (master program report)
2014 Completed IS/MND and filed NOD to support to program (CEQA)
2014 Completed negotiations with DDW and Regional Board
2014 Completed negotiations with DDW and Regional Board
2014 Dec.4 adoption of Master Reclamation Permit & WDR
Report of Waste Discharge
Report of Waste Discharge
• The Report of Waste Discharge (RWD) was submitted in support of consolidating Waste Discharge Requirements (WDR) R5‐01‐124 and WDR R5‐2007‐0109 into a renewed Waste Discharge Requirement for the Rancho Murieta C
Community Services District’s Wastewater Reclamation it S i
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Plant and a new Master Reclamation Permit to cover the use of recycled water within RMCSD’s service area. Previously Existing WDRs
May, 2001 ‐ WDR 5‐01‐124
August 2007 WDR R5‐2007‐0109
August, 2007 ‐
WDR R5 2007 0109
Current WDR
December 4, 2014 ‐ R5‐2014‐0149
Change allows:
Change allows:
• District becomes sole controlling agency responsible for recycled water use within District and approved areas with
recycled water use within District and approved areas with oversight by Regional Board and EPA
• Expansion of recycled water use within District to include public area landscape irrigation such as parks, sports fields, common areas, commercial and street landscaping and ancillary uses of future residential developments, front and y
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backyard residential landscape irrigation in specified areas, dust control, and expansion of Van Vleck Ranch area from 96 to 282 acres
to 282 acres.
• No longer need to monitor groundwater
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• Minor changes to Monitoring & Reporting Program
Existing & i i &
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potential use areas
Currently:
• We have a shortfall of available Recycled Water; We have a shortfall of available Recycled Water;
approximately 100 acre‐feet (32.6 million gallons)
• RMCC currently has first priority with respect to recycled water service
recycled water service.
Moving forward:
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• As more homes are connected to our sewer system, more wastewater will be received.
• At each point where there will be excess, we will need At each point where there will be excess we will need
to dispose of it as recycled water and our system will need to be expanded.
• Projecting excess recycled water between 2017 and j i
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20
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2020 (370 AFY at buildout)
Estimate of when Recycled Water becomes available
Equivalent to ADWF Equivalent to ADWF of about 0.6 MGD
of about 0.6 MGD
Estimated Level of Development and Projected Recycled Water Demands
Res. Units
(No.)
RW Demand
(AFY)
2,502
550
Infill
44
0
Phase 1 (2016-2019)
671
160
Lakeview
99
15.8
Murieta Gardens (+ comm.)
150
19.6
Residences of Murieta Hills
198
84.2a
Retreats
84
18.8
Riverview
140
22.4
1,029
366
Apartments
170
23 8
23.8
Esquela
40
29.6a
Estates of Calero
139
52.2
Estates of Chesbro
78
29.4
Estates of Clementia
94
31 7
31.7
Highlands
110
42.1
Ind./Com./Residences
100
50.9
River Canyon
120
46.4
Terrace
177
59.9
4,244
1,076b
Phases and Developments Current Conditions
Phase 2 (2020 – 2026)
Total
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Includes Stonehouse Park demand (14 AFY)
Supply and production capacity is estimated to be 920
AFY
Order
ADWF WWRP WWRP (MG) Demand Capacity (MG)
(MG)
Seasonal Reservoir Storage
Need (AF)
Seasonal Reservoir Storage ‐
Capacity (AF)
Effluent Reuse Need
Need (MG)
Effluent Reuse Capacity
Capacity (MG)
Existingg
0.5
600
747
765
765
2
2.3
WWRP: 3.0 mgd
Disinfection: 2.3 mgd
Phase 1
Phase 1
0.7
2.3
2.3
2 seasonal
reservoirs
737
WWRP: 3.0 mgd
Disinfection: 2.3 mgd
747
550 RMCC
215 VV
915
2 seasonal
reservoirs
1,175
Two golf courses: 550
Four Van Vleck Spray Fields: 625
District Completes Disinfection and Seasonal Storage Improvements
Phase 2
1.0
3.0
3.0
960
WWRP: 3.0 mgd Di i f ti
Disinfection: 3.0 30
mgd
970
1,250
1,340
RMCC: 550
Landscape: 165
Landscape: 165
4 VV. Spray Fields: 625
3 seasonal res.
District Completes WWRP Expansion and Second Seasonal Storage Improvements
Full Full
Buildout
1 55
1.55
65
6.5
WWRP: 6.5 mgd
WWRP:
6 5 mgd
Disinfection: 6.5 mgd
1440
1440
1440 4 seasonal res.
2 265
2,265
2 265
2,265
To Do:
To Do:
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Update Operations Manual
Develop Recycled water permit and procedure
Determine rates fees and other charges; adopt rate Ordinance for Chap 17
Determine rates, fees, and other charges; adopt rate Ordinance for Chap.17
Leveraging Existing Recycled Water System: The Project relies upon the use of the existing conveyance systems for recycled water conveyance and distribution. These existing systems currently deliver recycled water from the WWRP to the North and South Golf Courses Infrastructure requirements needed to serve future residential
South Golf Courses. Infrastructure requirements needed to serve future residential developments with recycled water can be minimized by leveraging the capacities readily available in these two systems.
Disinfection Facilities Upgrade (2.3 to 3.0 MGD) 195,000 gallons of additional contact time capacity
contact time capacity
Infrastructure Improvements to convey recycled water to the new and expanded use Areas
Seasonal Storage Expansion (747 to 970 AF) 240 acre‐feet required following Phase 1 improvements
Phase 1 improvements
Seasonal Storage Expansion (970 to 1440 AF) 470 acre‐feet required following Phase 2 improvements
Required reporting for each system improvement or capacity change.
Phase 1 Improvements
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Disinfection Facilities Upgrade: Currently the disinfection facilities have a rated capacity of 2.3 MGD, which limits recycled water production capabilities at the WWRP. These facilities will be upgraded to provide a rated capacity of 3.0 MGD in accordance with Title 22 requirements. North Golf Course Pumping Station Improvements: Currently this facility is configured to pump recycled water to either the North Golf Course or the Van Vleck Ranch. The objectives of this improvement project will be to (1) either the North Golf Course or the Van Vleck
Ranch The objectives of this improvement project will be to (1)
separate the functions of this station (one dedicated station for the North Golf Course and one dedicated for the Van Vleck Ranch) and (2) expand the firm capacity of the pumping station serving the North Golf Course to 2,110 gpm. The 2,110 gpm flow rate represents the estimated capacity of the existing 12‐inch recycled water pipeline serving the North Golf Course. Northwest Recycled Water Transmission Main: A new 12‐ and 10‐inch recycled water transmission main will be installed to serve future developments located along the northwest portion of Jackson Highway and Stonehouse
Road. It is envisioned that this main will also serve recycled water to Stonehouse Park for irrigation as well as the Apartments and Escuela in the future. This transmission main will be connected to the existing 12‐inch North Golf Course conveyance pipeline immediately north of the Yellow Bridge. A 12‐inch highway undercrossing and transmission main would be installed to the Murieta Gardens development beyond this point the transmission main can be reduced to 10‐inch diameter. Lookout Hill Recycled Water Storage Tanks and Pumping Station: Recycled water storage tanks are required to supplement recycled water production capacities needed to satisfy peak irrigation demands. Peak demands p
require 200,000 gallons of q
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associated with the Residences of Murieta Hills developments and Escuela
supplemental recycled water during the 8 hour irrigation schedule. It is recommended that a total capacity of 400,000 gallons be provided based on the prescribed storage criteria. To minimize cost, the existing 200,000 gallon water storage tank, which is currently not in service, will be rehabilitated and used for recycled water storage. In addition, a new 200,000 gallon storage tank will be installed at this site along with a 700 gpm pumping station that y
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is needed to deliver recycled water to the developments located in the northwest corner of the Study Area. Retreats Recycled Water Service Pipeline: A new 6‐inch diameter recycled water pipeline will be installed to serve the Retreats development. This pipeline will be connected to the existing 8‐inch North Golf Course conveyance pipeline. The estimated length of this pipeline is 1,730 lineal feet. Phase 2 Improvements
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Seasonal Storage Expansion: Approximately 240 AF of additional seasonal storage is required to accommodate the Phase 2 developments. This facility is to be located within the existing WWRP site. Industrial/Commercial/Residential Service Pipeline: A new 6
Industrial/Commercial/Residential Service Pipeline:
A new 6‐inch
inch diameter recycled water pipeline will diameter recycled water pipeline will
be installed to serve this development. This pipeline will be connected to the existing 12‐inch North Golf Course conveyance pipeline. Apartments Service Pipeline: A new 6‐inch diameter recycled water pipeline will be installed to serve this development. This pipeline will be connected to the Northwest Recycled Water Transmission Main. Esquela Service Pipeline: A new 6‐inch diameter recycled water pipeline will be installed to serve this development. This pipeline will be connected to the Northwest Recycled Water Transmission Main. North Conveyance System Extension: New 8‐ and 6‐inch recycled water transmission mains will be installed to serve the Terrace, Highlands, and River Canyon developments. The proposed 8‐inch transmission main will be connected to the existing 8‐inch North Golf Course conveyance pipeline near i i
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Bass Lake. Possibly Bass Lake Storage Tank and Pumping Station: Peak demands associated with the project require an additional 250,000 gallons of supplemental recycled water during the 8 hour irrigation schedule. A total capacity of 500 000 gallons will be provided based on the prescribed storage criteria along with a new
capacity of 500,000 gallons will be provided based on the prescribed storage criteria along with a new 1,040 gpm pumping station which is needed to deliver recycled water to the Terrace, Highlands, and River Canyon developments. The future? ‐
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Indirect potable reuse (IPR) is defined as the planned incorporation of purified municipal wastewater into an environmental buffer (e.g., aquifer or storage reservoir) for a specified period of time before being withdrawn for subsequent potable water treatment and distribution purposes. In DPR, the purified municipal wastewater is not placed into an environmental buffer. To address the increased interest expressed by water agencies, California’s Governor signed Senate Bill 918 into law in September 2010. This bill requires the Department of Drinking Water (formerly CDPH):
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Indirect Potable Reuse
Adopt uniform water recycling criteria for IPR for groundwater recharge by the end of 2013. The bill also requires that if an expert panel convened pursuant to the bill finds that the criteria for surface water augmentation would adequately protect public health, criteria for surface water augmentation must be developed by the end of 2016.
Investigate the feasibility of developing regulatory criteria for DPR and provide a final report on that investigation to the Legislature by the end of 2016. Preliminary assessments of the IPR and DPR options indicate that the configuration of the District’s existing raw water storage and recycled water conveyance systems could be modified for IPR via surface water augmentation cost‐effectively and potentially eliminate the need for seasonal storage. Currently, there are no recycling criteria addressing IPR via surface water augmentation in which to determine water and/or wastewater treatment requirements. However, surface water augmentation has previously been addressed in A Proposed Framework for Regulating the Indirect Potable Reuse of Advanced Treated Reclaimed Water by Surface Water Augmentation in California (California Potable Reuse Committee, 1996). The committee that wrote the framework concluded that planned IPR of advanced treated recycled water via surface water augmentation would not adversely affect drinking water quality if the following conditions were met: – Approved advanced wastewater treatment processes have been applied (e.g., advanced oxidation process A
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UV/peroxide, followed by reverse osmosis membrane treatment) 10 log removal standard
– All relevant water quality standards are achieved.
– Advanced treated recycled water is retained in a storage reservoir for sufficient time before treatment in a water treatment plant. – Downstream drinking water treatment operations will not be negatively impacted.
– There are multiple barriers for the removal of pathogens and toxic chemicals. The report states that source control of discharges into the wastewater collection system, conventional wastewater treatment, membrane treatment, disinfection, reservoir retention, and surface water treatment are effective physical and chemical barriers.