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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