Los Osos Community Services District

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Los Osos Community Services District

• Basin Management Planning and Proposed Work
  Program
• June 5, 2008

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Background

• Los Osos Groundwater Basin Supplies Water to
• LOCSD
• Golden State Water Company
• ST Mutual Water Company
• Other Ag and Private Wells
• Groundwater Recharge Comes from Many Sources
  Including
• Rainfall
• Creeks
• Irrigation return flow
• Septic System Discharge
• Leakage from Other Aquifer Zones

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Background, Cont.

• Safe Yield - the Amount of Well Pumping that
  Maintains Groundwater Levels Safely Above Sea
  Level, Even During Dry Periods
• If Exceeded, Sea Water Becomes an Unlimited
  Source of Unwanted Recharge
• Deeper Zones are More Prone to Intrusion
• The Lower Aquifer Currently Supplies 77 of the
  Water Delivered by the Three Water Purveyors
• Much of the Upper Aquifer is High in Nitrates,
  Blending or Treatment is Required

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Area of Sea Water Intrusion into Lower Aquifer
LOCSD Palisades Well
6
Downtown
Creek
Sand Spit
0
Upper Aquifer (Zone C)
Lower Aquifer (Zone D)
Lower Aquifer (Zone E)
Bedrock
-700
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Background, Cont.

• Los Osos Groundwater Basin is Broken into Two
  Compartments
• Urban Area Comprised of the East and West
  Compartment
• Creek Compartment

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ISJ Agreement

• September 2007 - Water Purveyors and the County
  of SLO Entered into an ISJ Agreement
• ISJ Interlocutory Stipulated Judgment
• Equitable Sharing of Costs Related to Data
  Gathering and Analysis, and Development and
  Implementation of the Basin Management Plan

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ISJ Meetings

• ISJ Group Members have been Meeting Monthly
• A Mutually-Agreeable Work Program has been
  developed that
• Meets the Intentions of the ISJ
• Maintains a Schedule that Facilitates Timely
  Input Into the County Wastewater Project

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ISJ Meetings, Cont

• County Applied for a 250,000 Department of Water
  Resources Grant
• To Partially Fund ISJ Group Efforts
• Application Did Not Receive Funding
• Cooperative Efforts Between ISJ Group
• Pursue Water Conservation Education Programs
• Inter-ties Between Purveyor Distribution Systems

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Undeveloped Property

• In July, 2007, the County adopted a policy
  relating to wastewater assessments for vacant
  properties
• A second wastewater assessment vote will be held
  for vacant and underdeveloped properties
• Water supply and infrastructure projects
  necessary to serve development may be included
• Funding from proceeds of the assessment vote can
  reimburse purveyors for costs relating to
  development

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Work Program

• Steps Required to Reach the Goal of the ISJ
  Prepare a Basin Management Plan
• Analyze the Existing Condition of the Groundwater
  Basin
• Assess various methods for maximizing basin
  resources, including conservation
• Evaluate the potential benefits of various
  wastewater disposal options

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Work Program

• Steps Required to Reach the Goal of the ISJ
  Prepare a Basin Management Plan
• Analyze the Existing Condition of the Groundwater
  Basin
• Assess various methods for maximizing basin
  resources, including conservation
• Evaluate the potential benefits of various
  wastewater disposal options

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Work Program

• Goals of the Work Program
• Define improvements and related costs that are
  necessary to achieve a balanced basin under
  current demand
• Explore opportunities for increasing the
  efficient, sustainable use of the basin with the
  Countys wastewater project
• Define improvements and related costs necessary
  to achieve build out without importing water
• Provide input to the County for wastewater
  project decisions and the future vacant property
  assessment vote

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Work Program, Cont.

• Proposed Program in Five Tasks (Tasks 1, 2, and
  3, Staff is Requesting to Proceed with at this
  Time)
• Task 1
• Update Steady State Hydraulic Model
• Adjust Build-out Projections of the Basin Water
  Demand, including water conservation
• Preliminary Evaluation of Nitrate Removal Unit
• Assess the potential of the upper aquifer before
  and after the wastewater project
• Task 2
• Evaluate and Determine Creek Compartment Safe
  Yield
• Perform Sampling Analysis for Water Quality of
  Creek Compartment

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Work Program, Cont.

• Task 3
• Prepare Groundwater Basin Infrastructure Master
  Plan
• Evaluate Groundwater Recharge Opportunities
• Evaluate Options for Beneficial Re-Use of
  Reclaimed Water
• Prepare a Draft Basin Management Plan
• Task 4
• Prepare a Transient, Dual-Density Hydraulic Model
  of the Groundwater Basin
• Task 5
• Annual Groundwater Monitoring
• Transient Model Updates Every Two Years

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Funding

• Funding Sources for These Tasks Depend on the
  Objective
• Tasks 1 2 Address Existing Deficiencies Related
  to Current Development
• Funded by the ISJ Group (Ultimately by Rate
  Payers)
• Percentage of Total Costs Based ISJ Agreement
• District Share 39

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Funding, Cont.

• Task 3 Benefits Future Development,
• Task is Completed Prior to Assessment Vote
• District to Fund Up Front Costs
• Will be Reimbursed if Assessment Vote is Passed
• Tasks 4 5 Benefit Future Development
• Tasks to Commence Following Secured Funding
  Source

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Work Program Costs

• District Share (39 of Work Program)
• Task 1 8,500
• Task 2 7,500
• Task 3 45,000
• Contingency 10,000
• Total 70,000

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Schedule

• June 2008 through August 2008 Water Purveyors
  Approve Work Program and Authorize Consultants to
  Proceed with Tasks 1 2
• August 2008 through February 2009 Completion of
  Task 3
• March 2009 Countys 2nd Proposition Vote

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Recommendations

• Board to Approve Funding of Purveyors Basin
  Management Planning and Proposed Work Program in
  Accordance with the ISJ Agreement

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Questions