Figure Initial Alternatives Numbering Characteristics Matrix

Transcription

1 TYPES OF POTABLE REUSE ALTERNATIVE NUMBER NPR Treatment IPR Treatment DPR: Cater WTP DPR: New WTP 1A 1B 2A 2B 3A 3B 4A 4B 1) Odd alternatives provide re-treatment at use Cater WTP for DPR; even alternatives provide re-treatment at new WTP for DPR. 2) Alternatives 1 and 2 do not consider IPR; alternatives 3 and 4 consider IPR and then use DPR for any remaining flow. 3) A letter alternatives maximize NPR first; B alternatives minimize NPR. 4) There is no waste brine stream associated with NPR treatment. 5) Water re-treated at new WTP can be distributed in City s low-pressure zone or sent to South Coast using new transmission main. PRIORITY LEVELS TO MAXIMIZE CAPACITY 1st Priority 2nd Priority 3rd Priority Figure Initial Alternatives ing Characteristics Matrix

2 TYPES OF POTABLE REUSE ALTERNATIVE NUMBER NPR Treatment IPR Treatment DPR: Cater WTP DPR: New WTP 1A 1B 2A 2B 3A 3B 1) A letter alternatives maximize NPR first; B alternatives minimize NPR. 2) There is no waste brine stream associated with NPR treatment. 3) Water re-treated at new WTP can be distributed in City s low-pressure zone or sent to South Coast using new transmission main. PRIORITY LEVELS TO MAXIMIZE CAPACITY 1st Priority 2nd Priority Figure Final Alternatives ing Characteristics Matrix

3 ALTERNATIVE NUMBER FLOW DIAGRAM DESCRIPTION NOTES 1A 716 AFY 7,944 AFY NPR Treatment DPR Treatment 716 AFY 6,355 AFY 1,589 AFY To East NPR Distribution System (including future) To West NPR Distribution System & Maximize NPR treatment & use Only tertiary treated flow going east. DPR treat all flows going west. DPR treated flow sent to. Alternative maximizes NPR treated flow. 1B DPR Treatment 6,928 AFY 1,732 AFY To NPR Distribution System & Maximize DPR by minimizing NPR & use Title 22 system is removed, and all flow is DPR treated and sent to. 2A 1,400 AFY 7,260 AFY NPR Treatment DPR Treatment 1,400 AFY 5,808 AFY 1,452 AFY To NPR Distribution System To new water treatment plant (co-located with Desalination Facility) Maximize NPR treatment & use new WTP NPR system remains in place as is. Remaining flow is sent to DPR facility, and retreated at new WTP co-located with Desalination Facility. 2B DPR Treatment 6,928 AFY 1,732 AFY To new water treatment plant (co-located with Desalination Facility) Maximize DPR by minimizing NPR & use new WTP NPR system is removed, and all flow is DPR treated and retreated at new WTP co-located with Desalination Facility. 3A 1,400 AFY 7,260 AFY NPR Treatment IPR Treatment 1,400 AFY 5,808 AFY 1,452 AFY To NPR Distribution System To IPR Injection Wells/Spreading Brains Maximize NPR treatment & use remaining flow for IPR NPR system remains in place. The remaining water is used for IPR and is injected/spread. 3B 1. RO recovery is assumed to be 80% for treatment process involving RO membranes (i.e., IPR and DPR). IPR Treatment 6,928 AFY 1,732 AFY To IPR Injection Wells/Spreading Brains Maximize IPR by minimizing NPR NPR system is removed, and all flow is IPR treated and sent to injection wells/spreading basins. Figure 3.19 Final Summary of Potable Reuse Alternatives

4 Golf Course Pump Station and Reservoir New 16" Pipeline from Golf Course Pump Station to Existing NPR Pipeline (Repurposed to Convey DPR Water) Portions of Existing NPR Pipeline which May be Abandoned Existing West NPR System May be Abandoned DPR Pipeline Extension Parallel DPR Pipeline Expansion 16" Pipeline to Connect DPR Facility to Existing Pipeline Existing East NPR System Remains as is and Conveys Tertiary Treated Water (2) Existing East NPR System Remains as is DPR Treatment Facility (1) 1. Existing NPR treatment system at may be relocated to the City s Corporation Yard (401 E. Yanonali St.) to consolidate reuse treatment facilities at one location. 2. New 12" pipeline is required to connect the relocated NPR treatment system to the existing East NPR distribution system. 12" Parallel Pipeline to Allow DPR Capacity. (Needed for Existing 12" Lines Installed in Phase I NPR System) Figure Alternative 1A Pipeline Alignment

5 Golf Course Pump Station and Reservoir New 16" Pipeline from Golf Course Pump Station to Existing NPR Pipeline (Repurposed to Convey DPR Water) Portions of Existing NPR Pipeline which May be Abandoned DPR Pipeline Extension Parallel DPR Pipeline Expansion Existing NPR System May be Abandoned (TYP) 16" Pipeline to Connect DPR Facility to Existing Pipeline DPR Treatment Facility 12" Parallel Pipeline to Allow DPR Capacity. (Needed for Existing 12" Lines Installed in Phase I NPR System) Figure Alternative 1B Pipeline Alignment

6 Existing NPR Pipeline Remains as is Tie-in From WTP to City Distribution System Existing NPR System Remains as is (2) New WTP Co-located with Desalination Facility DPR Treatment Facility Water Treated at DPR Facility, then New WTP, then Sent to City Distribution System (Option to Go into Low Pressure Zone or New Transmission Main to South Coast Conduit) (1) 1. Existing NPR treatment system at may be relocated to the City s Corporation Yard (401 E. Yanonali St.) to consolidate reuse treatment facilities at one location. 2. New 12" pipeline is required to connect the relocated NPR treatment system to the existing NPR distribution system. Figure Alternative 2A Pipeline Alignment

7 Existing NPR Pipeline which May be Abandoned Tie-in From WTP to City Distribution System Existing NPR System May be Abandoned (TYP) New WTP Co-located with Desalination Facility DPR Treatment Facility Water Treated at DPR Facility, then New WTP, then Sent to City Distribution System (Option to Go into Low Pressure Zone or New Transmission Main to South Coast Conduit) Figure Alternative 2B Pipeline Alignment

8 Existing NPR Pipeline Remains as is New Transmission Main to Injection Wells To IPR Injection Wells Refer to Figure 3.7 for Approximate Locations of Injection/Extraction Wells Existing NPR System Remains as is (2) IPR Treatment Facility 1. Existing NPR treatment system at may be relocated to the City s Corporation Yard (401 E. Yanonali St.) to consolidate reuse treatment facilities at one location. 2. New 12" pipeline is required to connect the relocated NPR treatment system to the existing NPR distribution system. (1) IPR Key Design Features Description Units Criteria Pipeline Required for IPR Wells (1) Approximate Length 8 Capacity, Total gpm (AFY) 4,000 (6,460) IPR Injection Wells IPR Extraction Wells Duty + Standby gpm (range) Duty + Standby gpm (range) Existing ACTIVE City Wells (2) No. gpm Existing INACTIVE City Wells (3) No. 4 Expanded Capacity at Ortega GWTP Additional Capacity Needed? (4) - Likely Notes: 1. Pipeline required for new injection and extraction wells. 2. It is assumed that these wells are needed to conduct the excess pumping required to make storage space available. 3. Inactive wells were not considered to be operational in the analysis. 4. Additional studies required to determine the need for additional treatment capacity at Ortega GWTP. Figure Alternative 3A Pipeline Alignment

9 Existing NPR Pipeline which May be Abandoned To IPR Injection Wells Refer to Figure 3.7 for Approximate Locations of Injection/Extraction Wells Existing NPR System May be Abandoned New Transmission Main to Injection Wells DPR IPR Treatment Facility IPR Key Design Features Description Units Criteria Pipeline Required for IPR Wells (1) Approximate Length 8 Capacity, Total gpm (AFY) 4,770 (7,700) IPR Injection Wells Duty + Standby gpm (range) IPR Extraction Wells Existing ACTIVE City Wells (2) Duty + Standby gpm (range) No. gpm Existing INACTIVE City Wells (3) No. Expanded Capacity at Ortega GWTP Additional Capacity Needed? (4) - 4 Likely Notes: 1. Pipeline required for new injection and extraction wells. 2. It is assumed that these wells are needed to conduct the excess pumping required to make storage space available. 3. Inactive wells were not considered to be operational in the analysis. 4. Additional studies required to determine the need for additional treatment capacity at Ortega GWTP. Figure Alternative 3B Pipeline Alignment

10 Table 3.22 Potable Reuse Alternatives Initial Screening Results Potable Reuse Alternative Initial Screening Criteria Alternative 1A Alternative 1B Alternative 2A Alternative 2B Alternative 3A Alternative 3B Geotechnical Hazards 1 Seismic Hazard a. Project facilities would cross a known fault line, or be exposed to a seismic hazard that could otherwise not be protected from loss by design Hydrogeologic Factors 2 Operation of groundwater replenishment facilities (i.e., injection wells or spreading basin) adversely impacts existing fresh water aquifers, local water supplies or existing water users. a. Insufficient travel time (e.g., < 2 months) between groundwater replenishment point and other groundwater users. 3 Operation of groundwater replenishment facilities (i.e., injection wells or spreading basin) adversely impacts sensitive habitats such as marshlands, drainage areas, etc. a. Operation of facility adversely changes water quality of habitat (e.g., salt water habitat becomes fresh water). 4 Insufficient storage space a. Groundwater basin lacks adequate storage capacity to receive 10,000 AFY (or 11,400 AFY) at build-out b. Groundwater replenishment of IPR water causes loss of ability to adequately manage the groundwater basin (e.g., artesian or flooding conditions, loss of stored water, etc.) c. Groundwater replenishment of IPR water does not result in an increase in total basin yield and overall yield of 10,000 AFY (or 11,400 AFY). Oceanographic Factors 5 Sea level rise or tsunami hazard a. Oceanographic hazards make aspects of the project infrastructure vulnerable in a way that cannot be protected and/or would prevent the City from being able to receive funding or insurance for this concept Presence of Sensitive Habitats 6 Habitat creation PF PF PF PF PF PF PF (4) PF (4) PF (4) PF (4) PF PF PF (4) PF (4) PF (4) PF (4) PF (5) PF (5) PF (4) PF (4) PF (4) PF (4) PF* PF* PF (4) PF (4) PF (4) PF (4) PF PF PF (4) PF (4) PF (4) PF (4) PF* PF* PF PF PF PF PF PF a. Facility creates habitat that is unsustainable (i.e., requires continued discharge by IPR or DPR facility) or adversely affects local ecosystem PF PF PF PF PF PF October DRAFT 3-95 pw:// Carollo/Documents/Client/CA/Santa Barbara/8083D00/Deliverables/Potable Reuse Study/TM03/TM 03 - BOD and Initial Screening (PR).docx

11 Table 3.22 Potable Reuse Alternatives Initial Screening Results Potable Reuse Alternative Initial Screening Criteria Alternative 1A Alternative 1B Alternative 2A Alternative 2B Alternative 3A Alternative 3B Design and Construction Issues 7 Adequate capacity a. Availability of effluent needed to produce 10,000 AFY (or 11,400 AFY) of recycled water at build-out b. IPR or DPR production capacity and/or aquifer losses result in less than 10,000 AFY (or 11,400 AFY) of production at build-out PF* PF* PF* PF* PF* PF* PF* PF* PF* PF* PF* PF* 8 Lack of adequate land required for IPR or DPR treatment facilities or groundwater replenishment facilities a. Surface area needed for footprint of IPR or DPR treatment facilities or groundwater replenishment facilities is greater than what is available. PF PF PF PF PF PF b. Requires condemnation of property for new injection well facilities. PF (4) PF (4) PF (4) PF (4) PF PF Passes Initial Screening? Yes (Y) or No (N) N N N N N N Regulations Exist in CA? Yes (Y) or No (N) 6 N N N N Y Y Notes: (1) NF = Not Feasible (2) PF = Potentially Feasible (3) PF* = Potentially Feasible, but does not meet current study goals (4) Potentially feasible because alternative does not include an IPR component. Thus, this initial screening criteria is not applicable. (5) Additional study will be required to locate groundwater replenishment wells at locations that will not adversely affect sensitive areas or other users. (6) Do standard regulations exist in the state of California currently to implement the alternative? October DRAFT 3-96 pw:// Carollo/Documents/Client/CA/Santa Barbara/8083D00/Deliverables/Potable Reuse Study/TM03/TM 03 - BOD and Initial Screening (PR).docx