South Orange County Watershed Management Area Executive Committee. July 18, 2013

Transcription

1 South Orange County Watershed Management Area Executive Committee July 18, 2013

2 AGENDA ITEM 1 ROLL CALL Mary Anne Skorpanich

3 AGENDA ITEM 2 ELECTION OF CHAIR AND VICE CHAIR Mary Anne Skorpanich

4 Recommended Action: Elect new Chair and Vice Chair to serve one year term

5 AGENDA ITEM 3 APPROVAL OF MINUTES Mary Anne Skorpanich

6 Recommended Action: Approve the minutes of the May 2, 2013 meeting as provided

7 AGENDA ITEM 4 ADOPTION OF INTEGRATED REGIONAL WATERSHED MANAGEMENT PLAN Mary Anne Skorpanich

8 2013 Plan vs Plan UPDATED Water Supply Water Quality Natural Resources Water Use Efficiency ADDED Flood Management Climate Change Analysis Quantitative Project Ranking System Appendix: Groundwater Management Plan * Appendix: Salt-Nutrient Management Plan * 8

9 IRWM Plan Timeline Task Name Start Finish IRWMP Update 6/25/12 9/30/13 Prepare Draft IRWM, Public Workshops 6/25/12 2/22/13 IRWM Management Committee Review 2/25/13 3/22/13 Public Review 4/15/13 5/03/13 Public Workshop 4/30/13 4/30/13 Prepare Draft Final IRWM 5/06/13 5/17/13 IRWM Management Committee Review 5/20/13 5/31/13 Prepare Final IRWM 6/03/13 6/14/13 Executive Committee Review of Final Draft 6/17/13 6/28/13 Executive Committee Meeting: Approve IRWM 07/18/13 07/18/13 Local Approval Process 8/05/13 9/20/13 Due to State 9/30/13 9/30/13 9/30/13

10 Recommended Actions 1. Adopt 2013 South Orange County Integrated Regional Watershed Management Plan 2. Direct staff to return for adoption of the Salt & Nutrient Management Plan and the Groundwater Management Plan as appendices to the Integrated Regional Watershed Management Plan when each is final

11 AGENDA ITEM 5 UPDATE ON WATERSHED WORKPLANS Jennifer Shook, County of Orange

12 Presentation Outline 1. Overview 1. Goals 2. Background 3. Structure & Content Workplan Updates 3. Regional Permit Preview 4. Integration with IRWMP

13 Watershed Workplan Overview

14 Workplan Goals Framework for collective action for each watershed Focus on: solving water quality and beneficial use problems in receiving waters documenting issues and progress Maintain compliance with the 2009 Permit from San Diego Regional Board

15 Municipalities in Each Watershed Aliso Creek Dana Point Coastal Laguna Coastal San Clemente Coastal San Juan Creek San Mateo Creek Aliso Viejo X X Dana Point X X Laguna Beach X X Laguna Hills X X Laguna Niguel X X X Laguna Woods X Lake Forest X Mission Viejo X X Rancho Santa Margarita X San Clemente X X San Juan Capistrano X County & OCFCD X X X X X X

16 Watershed Workplan Background 2013 marks the third year of Watershed Workplan implementation Watershed Workplans are updated annually based on: Water Quality Monitoring Results Special Study Results Best Management Practice (BMP) Assessment Stakeholder Feedback

17 Workplan Structure & Content Section 1: Introduction Section 2: Receiving Water Quality Concerns and Priorities Section 3: BMP Selection and Implementation

18 Water Quality Challenges Benzo[b]fluoranthene Cadmium Chloride Copper Diazinon DDE Dieldrin Aliso Creek MEDIUM MEDIUM Dana Point Coastal Streams MEDIUM Laguna Coastal Streams San Clemente Coastal Streams MEDIUM San Juan Creek MEDIUM MEDIUM MEDIUM Indicator Bacteria HIGH HIGH HIGH HIGH HIGH Nickel MEDIUM Phosphorus MEDIUM MEDIUM Sediment Toxicity MEDIUM MEDIUM Selenium LOW LOW Sulfates Total Dissolved Solids Total Nitrogen MEDIUM LOW MEDIUM Toxicity LOW LOW LOW LOW LOW Turbidity Zinc MEDIUM MEDIUM San Mateo Creek

19 2013 Updates

20 Water Quality Monitoring Results Decreasing trend of bacteria in receiving water Beach water quality trends moderate to very good during dry weather Stormdrain bacteria levels show decreasing trends

21 Heal the Bay 2012 Highlights 89% A grades for summer dry weather 94% A or B grades for summer dry weather 69% A or B grades for wet weather No OC beach closures in 10 consecutive months: June 2011-April 2012

22 Assessing Bacteria BMP Effectiveness New: Ranking effectiveness of Best Management Practices based on data and literature Highly Effective Effective Low/Potentially Effective

23 Examples of Highly Effective BMPs Media filtration with ultraviolet Wetland Treatment Diversion Structures Ozone Treatment Bioretention

24 Updated BMP Worksheets Expanded BMP Effectiveness Assessment, broken out by dry and wet weather.

25 Future Workplan Updates Posted on in December timeframe for public comment Annual updates reviewed at South WMA Executive Committee Comments can be submitted year-round to

26 Regional Permit Preview

27 Regional Permit Preview Adopted May 8, 2013 Covers south Orange County, south Riverside County, and San Diego County Takes effect December 2014 for south Orange County Watershed Workplans will be replaced by one Water Quality Improvement Plan (WQIP) for south Orange County

28 Water Quality Improvement Plan Priority Water Quality Conditions Goals, Strategies and Schedules WQIP with Monitoring Schedule Consultation Panel

29 Watershed Workplan & IRWMP Relationship

30 WATER QUALITY WATER USE EFFICIENCY JURISDICTIONAL RUNOFF MANAGEMENT PLANS FLOOD MANAGE- MENT NATURAL RESOURCES WATERSHED WORKPLANS WQIP COMPREHENSIVE LOAD REDUCTION PLANS WATER SUPPLY SOUTH OC IRWMP

31 Questions?

32 Recommended Action: Receive and File

33 AGENDA ITEM 6 UPDATE ON SALT & NUTRIENT MANAGEMENT PLAN Brennan Flahive, South OC Wastewater Authority

34 About SOCWA 10 member agencies Manage two areawide Recycled Water Orders SOCWA MA helped pioneer use of recycled water several projects started early & mid 1960s SOCWA leads Region 9 in recycled water production

35 Salt & Nutrient Management Planning Background Water Board Adopted Recycled Water Policy in February 2009 All Basins in California must develop SNMP by May 2014 (2016) Level of SNMP effort appropriate for basin Locally-Driven Stakeholder Process Amend RB Basin Plans to incorporate local SNMPs

36 Study Area Hydrologic Boundaries Region 8 Region 9

37 San Juan Basin

38 Scope of Work Summarize Existing Groundwater Quality Data Identify Salt & Nutrient Sources Develop Models Evaluate Impacts to Groundwater Perform Salt/Nutrient Loading Analysis Identify Areas of Groundwater Degradation Develop best management practices & mitigations Develop South OC Salt & Nutrient Management Plan Prepare SNMP report to Region 9

39 Levels of Analysis Hydrologic Area Type No significant groundwater resources and no significant downstream concerns Analysis Level Ambient Concentration Determination Type of Analytic Approach Loading Analysis Projection of Salt and Nutrient Concentrations Anti-degradation Analysis 1 None None None None Marginally significant groundwater resources and significant downstream concerns 2 Perform ambient water quality determination Perform loading analysis Develop salt and nutrient projections for groundwater Not yet determined Modest groundwater resources and significant downstream concerns 3 Perform ambient water quality determination Perform loading analysis Develop salt and nutrient projections for groundwater Make antidegradation findings as required Significant groundwater resources 4 Perform ambient water quality determination Perform loading analysis Develop salt and nutrient projections for groundwater Make antidegradation findings as required

40 Study Area Levels of Analytical Focus

41 Groundwater Basin Plan Objectives (in milligrams per liter) Hydrologic Subarea HSA # TDS Oso Upper Trabuco Middle Trabuco Gobernadora Upper San Juan Middle San Juan Lower San Juan Ortega N as NO San Mateo

42 Key Questions What is the assimilative capacity (AC) of each sub basin? Assimilative Capacity for TDS If Existing Average GW Quality > 750 mg/l No AC Basin Plan Objective = 750 mg/l Available AC = 250 mg/l If Existing Average GW Quality is 500 mg/l

43 Basin Characteristics and Activities Impact Load Estimates Precipitation Irrigation (Potable and Recycled) Land Use Coverage/ Runoff and Evapotranspiration Septic Systems Soil Characteristics Recharge Groundwater Pumping Diversion of Urban Runoff

44 Salt-Balance Model STORM NON-STORM PREC POTABLE IRRIGA RETURN RECYCLED IRRIGA RETURN URBAN RETURN EVAP WELL/ DIVERSION SUBSURF SALT BANK STORM ALLUVIAL SURFACE/ SUBSURFACE DRAINAGE ELEMENT GEOLOGIC LEACHING NON-STORM SUBSURF DEEP PERC

45 Total Dissolved Solids Assimilative Capacities

46 Methodology to Compute Ambient Water Quality Ambient Water Quality: the volume-weighted concentration of a water quality constituent in a groundwater basin. Step 1: Develop TDS and NO 3 -N point statistics for each well in the groundwater basin and develop concentration contours The point statistic is the 5-year annualized average of measured values for the period from Step 2: Create Fishnet Grid of the Basin 15 x 15 m cells and populate each grid with aquifer geometry and parameters Step 3: Compute the volume of water in the groundwater basin by using groundwater elevation contours for 2011 Step 4: Compute the volume-weighted concentration in the groundwater basin

47 Calculating Ambient Water Quality C amb = 1/V T * (V i * c i ) Water Level Grid Cell Properties: Specific yield, concentration Bottom of Aquifer

48 Total Dissolved Solids Point Map TDS Point Statistics

49 Projecting Future Ambient Water Quality CSRM: Constantly Stirred Reactor Model. - An implicit finitedifference approximation to compute changes in water quality in a simplified reactor (the groundwater basin) Step 1: Estimate the volume of water in storage and weighted TDS and nitrate-nitrogen concentration at the start of the simulation period (initial condition) Step 2: Identify all inflows (recharge) and outflows (discharge) for the groundwater basin Step 3: For each recharge and discharge term, estimate the volume (Q) and TDS for each time step that will be modeled Step 4: Run the model to project TDS concentration changes over time for each recycled water alternative

50 Ambient Conditions Total Dissolved Solids Map

51 Recycled Water Alternatives Baseline Alternative 1 of the San Juan Basin Authority (SJBA) Groundwater Management Plan (GWMP): Adaptive production management No projects to enhance the yield from the basin Planned recycled water for direct non-potable use by CSJC and SCWD SJBA Groundwater Management Plan Alternative 6: Increase stormwater recharge by 1,000 acre-feet/year Implement an extraction barrier to prevent seawater intrusion that pumps and treats a total 4,000 acre-feet/year (50% groundwater, 50% seawater) Recycled water recharge (plus increase pumping to balance storage) 6A) 2,000 acre-feet/year 6B) 5,000 acre-feet/year 6C) 10,000 acre-feet/year

52 Placeholder for TDS Projection Plot of Results

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54 Nitrate Map

55 Next Steps for Developing an SNMP Example Management Strategies Source control Source load reduction Source water salinity control Salt export Groundwater recharge Groundwater management Landscape Conservation Stormwater/Runoff Management Ongoing monitoring to fill data gaps Opportunities to modify Basin Plan objectives

56 Summary of Findings Basin Plan Assimilative Capacity (AC) SNMP Strategies Basin TDS Monitoring and Modify Current Future Objective Analysis Basin Plan Oso ,200 No No x x Upper Trabuco Yes Yes x Middle Trabuco No No x x Gobernadora ,200 Yes Yes x Upper San Juan Yes Yes x Middle San Juan Insufficient Data x Lower San Juan ,200 No No x x Ortega ,100 No No x x San Mateo (Cristianitos) No No x x Note that Basin Plan objectives in a couple of the basins are neither consistent with existing groundwater quality nor projected groundwater quality, but the projected salt loads are within those addressed in the current SOCWA recycled water WDRs.

57 SNMP Time Line Summarize Existing Groundwater Quality Data Identify Salt & Nutrient Sources Develop Models Evaluate Impacts to Groundwater Perform Salt/Nutrient Loading Analysis Identify Areas of Groundwater Degradation Develop Best Management Practices Develop Salt & Nutrient Management Plan Prepare Final Report to Regional Board August 2013

58 Questions?

59 Recommended Action: Receive and File

60 AGENDA ITEM 7 UPDATE ON GROUNDWATER MANAGEMENT PLAN Don Bunts, Santa Margarita Water District for San Juan Basin Authority

61 San Juan Basin Authority Member Agencies Moulton Niguel Water District South Coast Water District San Juan Basin Authority City of San Juan Capistrano Santa Margarita Water District

62 San Juan Basin Groundwater Management & Facilities Plan: Purpose Recom. Mgmt./ Monitor. Efforts Current Status of the Basin Hydrologic System Model Develop Basin Mgmt. Goals SJBGMFP Projected GW Available

63 San Juan Creek Watershed

64 Groundwater Management Alternatives 1. Adaptive Production Management with Existing Recharge and Production Facilities 2. #1 + Seawater Injection Barrier 3. #1 + Seawater Extraction Barrier 4. #1 + Barrier + Ranney-style Wells 5. #4 + In-stream Recharge 6. #5 + Recycled Water Recharge 64

65 Groundwater Management Alternatives with Doheny Desalter Project 7. Adaptive Production Management with Existing Recharge and Production Facilities 8. #7 + Ranney-style Wells 9. #8 + In-Stream Recharge 10.#9 + Recycled Water Recharge 65

66 Implementation of Plan Recommendations Adaptive Production Management Identify private wells and demands Determine Facilities & Operations to Supply Private Demands Assess Feasibility Complete CEQA Finalize Agreements w/ Private Users Planning and CEQA for Recommended Alt. Complete Agreements for San Juan Basin Authority Members Participation Design and Construction

67 Questions?

68 Recommended Action: Receive and File

69 AGENDA ITEM 8 EXECUTIVE OFFICER REPORT Mary Anne Skorpanich

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71 AGENDA ITEM 9 EXECUTIVE COMMITTEE MEMBER COMMENTS

72 AGENDA ITEM 10 PUBLIC COMMENTS

73 AGENDA ITEM 11 ADJOURNMENT NEXT MEETING: October 3, 2013 Location: Laguna Niguel Council Chambers

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