MRWPCA Proposed Groundwater Replenishment Project

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MRWPCA Proposed Groundwater Replenishment
Project

• By
• Keith Israel, General Manager
• Monterey Regional Water
• Pollution Control Agency
• August 25, 2005

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Overview of Presentation Topics

• General MRWPCA Background
• Recycled Water Availability
• Orange County Groundwater Recharge Experience
• Proposed MRWPCA Project

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Service Area
LEGEND
MOSS
LANDING
CASTROVILLE
MARINA
MARINA
SAND
PACIFIC
CITY
BORONDA
GROVE
SEASIDE
SALINAS
FORT
MONTEREY
ORD
MILITARY
RESERVATION
DEL
REY
OAKS
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Recycled Water Availability
13,500
Available 10,000 AFY
AF/YR
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Water Factory 21 A 15 mgd advanced waste water
reclamation facility, supplied fresh water for
sea water barrier

• Since 1975 produced over 100,000 ac-ft of water
  that blends with existing groundwater
• Over 25 years of operating experience
• Injected water is withdrawn by municipal wells as
  drinking water
• Injected water meets all drinking water standards
• 1/3 of product water treated by Reverse Osmosis

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The New 75 MGD Groundwater Replenishment System
(GWRS) was conceived to provide a new, reliable
water supply

• Concept Secondary Treated discharge to the
  Ocean would be treated to Drinking Water
  Standards and recharged into the OC Groundwater
  Basin

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GWR System Advanced Water Treatment Flow Diagram
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What Would a MRWPCA Project Look Like?

• Treatment Facilities
• Distribution Pipeline
• Recharge/Injection

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PROPOSED GROUNDWATER REPLENISHMENT
PROJECT Seaside Groundwater Basin
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Water Purification Plant

• Use Secondary or Tertiary Effluent
• Treatment would include
• Micro Filtration (if needed)
• Reverse Osmosis
• Ultraviolet Disinfection/Oxidation
• Facilities Likely at RTP
• Brine Discharged to Outfall

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GWR System Treatment Scheme A multiple barrier
concept producing purified water
Ultraviolet Light with H2O2
SVRP Filtration Plant
Reverse Osmosis
MRWPCA Secondary Effluent
Recharge Basins Injection Wells
Backwash to Secondary Plant
Brine MRWPCA Outfall
Highest Quality Available
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Distribution System

• New Pump Station and Pipeline
• Alignment through Fort Ord along General Jim
  Moore Blvd
• Pipeline could be dual purpose
• Carry recycled water during summer irrigation
  season and purified water in winter

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Recharge / Injection

• Percolate through soil for recharge of aquifer
• or
• Directly inject into the appropriate aquifer

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Preliminary Estimates of Project Timing, Sizing,
and Cost

• Operate in winter months
• Up to 2,800 AFY
• Cost could be in the 1,000 - 1,200/AF range
• Project compatible with Joint Urban Recycled
  Water Project with MCWD

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Next Steps

• Construct monitoring wells near recharge area
• Determine best pilot recharge location
• Collaborate with other Agencies on Recharge
• Schedule future visit to Orange County for
  interested parties

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CONCLUSIONS

• Project would be based on
• Highly successful Water Factory 21
• MRWPCA experience of safely producing food crop
  irrigation water
• Further using winter wastewater is a cost
  effective strategy that reuses a valuable
  resource
• Project could be implemented relatively quickly
  (5 to 6 years)

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Changing Wastewater Into Safe Water