Transcript Presentation example, Arial, bold, 24 pt, white

Monterey Peninsula Water Supply Project Presentation to
Monterey Co. Water Resources Agency
June 25, 2012
Monterey Peninsula Water Supply Project
• Our application before the California Public Utilities
Commission is extensive. To signup for project updates or
view the application, visit our project website:
www.watersupplyproject.org
2
Presentation Topics
• MPWSP Basics
 How GWR fits into our Project
 Where are we now
• Design of MPWSP Intake System to Minimize Intake of Inland
Groundwater
• Desalinated Water Supply to SV User
• Seawater Intrusion Control Benefits
• Reclaimed Water Salinity Control
3
MPWSP Basics
• Desalination and ASR facilities required to replace partial loss
of supplies from Carmel River and Seaside Groundwater
Basin.
• 5.4 MGD to 9.0 MGD (5,500 to 9,000 AFA) desalination plant,
depending on implementation of MRWPCA’s GWR project.
• Desalination plant to be located near landfill entrance.
• 13.2 to 22 MGD slant intake system (6 to 8 Wells) on coastline
• Brine discharge to MRWPCA’s existing outfall
4
Role of GWR
• Independent Project by MRWPCA
• Groundwater Replenishment (GWR) which takes secondary
wastewater effluent and processes it through an Advanced
Water Treatment facility is a great opportunity for the
Peninsula by:
 Lower overall Carbon Footprint
 Reduce Loadings to Monterey Bay
 Creates vast underground storage reservoir
• CAW’s desal plant will be sized nearly in half if GWR can be
implemented.
5
Where are we now?
• Submitted Application to CPUC on April 23, 2012, seeking
approval to design, build and place into rates a 9,006 AFA
desal plant.
• Application includes CEQA review by CPUC.
• Application also seeks permission to make desal plant smaller
(5,506 AFA) if the GWR project can be realized in time. The
decision to implement GWR will be based on several factors,
including: cost, schedule, and public acceptance.
• ALJ expected to issue scoping memo soon which will layout
CPUC schedule.
6
Intake being Considered
Intake Wells
• Objectives:
 Limit intake of water from inland sources to the extent
practicable
 All water taken from beneath the seafloor beyond the shoreline.
• Method:
 Slant Wells, with screens placed under the seafloor and in 180foot formation.
8
Slant Well – Typical Cross Section
9
Slant Well – Estimated Depression Contours
Extensive technical analysis of
the potential effects and
impacts of the slant wells on
local and regional groundwater
conditions in the SVGB was
performed by Geoscience and
Luhdorff & Scalmanini as part
of the CEQA review for the
Regional Water
Project. These are two of the
leading groundwater
consulting firms in the State.
CPUC is revisiting as part of
their review of the project.
10
Test Slant Well
• Currently working on Test Slant Well to be located on Cemex
property at southern end.
• Monitoring wells to be located 200 – 250 feet north of test
slant well and would be used to verify geology prior to
installation of slant well.
• We will work with MCWRA to develop a comprehensive
monitoring program.
• Test well program is needed to gather more information as to
geology, salinity, configuration, etc.
11
Agency Act & Water Rights
• CAW will return 100% of all groundwater captured to the
SVGB basin. Proposed action is consistent with Agency Act
and California Water Rights Law.
• Options for Return to Basin:
 1) CSIP
 2) Drill injection well on CAW property, and
 3) Make available for beneficial use to MCWRA or other party.
12
Desalinated Water to be Returned to Basin
• Examples:
 Assume 9,000 AFA plant capacity
 Assume 0% ground water capture (future 2030 condition)
 Annual return to be 9,000 * (% GW ) = 0 AFA
 Assume 9,000 AFA plant capacity
 Assume 1% ground water capture (future 2030 condition)
 Annual return to be 9,000 * (% GW ) = 90 AFA
 Assume 9,000 AFA plant capacity
 Assume 3% ground water capture (future 2030 condition)
 Annual return to be 9,000 * (% GW ) = 270 AFA
13
CSIP Impacts if this Return to Basin Option Used
• Objectives:
 Increase water available to CSIP for agricultural irrigation
 Reduce Salinity of CSIP irrigation water
• Method:
 Returning a portion of desalinated water to CSIP will increase
supply and reduce salinity of CSIP’s irrigation water
 Adjusting salinity of desal supply will reduce salinity of CAW’s
combined water supply and reduce the salinity of wastewater
generated by CAW’s customers.
14
Salinity of Water Supply
Post Desal
15
Existing Salinity
FOR ILLUSTRATION PURPOSES
16
Proposed Salinity
FOR ILLUSTRATION PURPOSES
with GWR Chlorides  ~60mg/l
17
Questions
18