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Los Osos Community Services District. Basin Management Planning and Proposed Work Program June 5, 2008. Background. Los Osos Groundwater Basin Supplies Water to: LOCSD Golden State Water Company S&T Mutual Water Company Other Ag and Private Wells

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Los Osos Community Services District

Basin Management Planning and Proposed Work Program

June 5, 2008


Background

  • Los Osos Groundwater Basin Supplies Water to:

    • LOCSD

    • Golden State Water Company

    • S&T 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


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


Area of Sea Water

Intrusion into Lower

Aquifer

LOCSD

Palisades

Well


Downtown

Creek

Sand Spit

0

Upper Aquifer (Zone C)

Lower Aquifer (Zone D)

Lower Aquifer (Zone E)

-700

Bedrock


Background, Cont.

  • Los Osos Groundwater Basin is Broken into Two Compartments

    • Urban Area – Comprised of the East and West Compartment

    • Creek Compartment


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


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


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


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


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


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


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 County’s 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


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


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


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%


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


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


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 – County’s 2nd Proposition Vote


Recommendations

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


Questions


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