MRWPCA Proposed Groundwater Replenishment Project By Keith Israel, General Manager Monterey Regional Water Pollution Control Agency August 25, 2005
Overview of Presentation Topics ¡ General MRWPCA Background ¡ Recycled Water Availability ¡ Orange County Groundwater Recharge Experience ¡ Proposed MRWPCA Project
LEGEND MOSS LANDING Service Area CASTROVILLE MARINA SAND CITY PACIFIC GROVE BORONDA SEASIDE SALINAS FORT ORD MILITARY RESERVATION MONTEREY DEL REY OAKS
Recycled Water Availability 13, 500 AF/YR Available: 10, 000 AFY
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100, 000 ac-ft of water that blends with existing groundwater Over 25 years of operating experience Injected water is withdrawn by municipal wells as drinking water Injected water meets all drinking water standards 1/3 of product water treated by Reverse Osmosis
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
GWR System Advanced Water Treatment Flow Diagram Ultraviolet OCSD Secondary Effluent Microfiltration (MF) Reverse Osmosis (RO) +Peroxide Purified Water Backwash OCSD Plant 1 Brine OCSD Outfall
What Would a MRWPCA Project Look Like? ¡ Treatment Facilities ¡ Distribution Pipeline ¡ Recharge/Injection
PROPOSED GROUNDWATER REPLENISHMENT PROJECT Seaside Groundwater Basin
Water Purification Plant ¡ Use Secondary or Tertiary Effluent ¡ Treatment would include: l Micro Filtration (if needed) l Reverse Osmosis l Ultraviolet Disinfection/Oxidation ¡ Facilities Likely at RTP ¡ Brine Discharged to Outfall
GWR System Treatment Scheme – A multiple barrier concept producing purified water SVRP Filtration Plant Reverse Osmosis MRWPCA Secondary Effluent Ultraviolet Light with H 2 O 2 Recharge Basins Injection Wells Backwash to Secondary Plant Brine MRWPCA Outfall Highest Quality Available
Distribution System ¡ New Pump Station and Pipeline ¡ Alignment through Fort Ord along General Jim Moore Blvd ¡ Pipeline l could be dual purpose: Carry recycled water during summer irrigation season and purified water in winter
Recharge / Injection ¡ Percolate through soil for recharge of aquifer or ¡ Directly inject into the appropriate aquifer
Preliminary Estimates of Project Timing, Sizing, and Cost ¡ Operate ¡ Up in winter months 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
Next Steps ¡ Construct monitoring wells near recharge area ¡ Determine location best pilot recharge ¡ Collaborate with other Agencies on Recharge ¡ Schedule future visit to Orange County for interested parties
CONCLUSIONS ¡ Project would be based on: l Highly successful Water Factory 21 l MRWPCA experience of safely producing food crop irrigation water l Further using winter wastewater is a cost effective strategy that reuses a valuable resource l Project could be implemented relatively quickly (5 to 6 years)
Changing Wastewater Into Safe Water
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