www.sonomacountywater.org

Southern Sonoma Storm Water Resource Plan

Technical Advisory Committee Meeting #2July 26, 2017

10-12pm

Agenda

• Introductions• Progress Update & Milestones (5 min)

• Water Quality Approach (25 min – 15 min presentation w/10 min Q&A)

• Project Submission (10 min)

• Project Screening for Eligibility (10 min)

• Project Prioritization (5 min)

• Draft Benefit Criteria & Weighting (55 min)

• Public Outreach Strategy (5 min)

• Next Steps (5 min)

Progress to Date

• Executed agreement with State Water Board 4/26• Partner MOUs and contracts • Deliverables submitted to State:

– Detailed Schedule– TAC Roster– SWRP Outline– Watershed Description & Justification

• Developed draft prioritization approach for TAC review

Milestones

• Comments on Approach to Address WQ: August 10• Data Submission Date: August 10• Project Submissions Due: initial Aug. 10 & final Sept.12 • TAC Meeting #3: Week of September 18 (20th?)• Public Meetings (Petaluma and Sonoma): October 2017• Admin Draft Plan: March 2018• Admin Review/Comment Period: April 2018• Public Draft Plan: June 2018• Public Comment Period: July 2018• Finalize Plan: September 2018

Review SWRP Goals & Objectives

• Purpose is to develop multi-benefit projects within the planning area that capture and reuse storm water and dry weather runoff

• Greatest benefit to the watershed & public• Must assign and quantify benefits• Must prioritize projects

• Include stakeholder & public input• Position projects for future funding

Water Quality Approach

• Projects under the SWRP have potential of reducing pollutant loading to receiving water bodies

• Can assist agencies/region with compliance with applicable MS4 permit and TMDLs

TABLE 1 TMDLS ADOPTED AND IN DEVELOPMENT FOR THE SOUTHERN SONOMA SWRP PLANNING AREA

Adopted TMDLs Adoption Date

Sonoma Creek Pathogens June 14, 2006

Sonoma Creek Sediment December 12, 2008

Diazinon and Pesticide-Related Toxicity in Urban Creeks December 12, 2008

Approved Delisting Approval Date

Sonoma Creek Nutrients November 16, 2005

In Development Anticipated Release

Petaluma River Bacteria and Nutrients Fall 2018 SOURCE: SFRWQCB, 2016a

WQ Approach – Sonoma Creek Sediment

• TMDL completed in 2008• Prompted due to declines in native fish

populations• Goals

• Conserve fishery populations and enhance overall health

• Protect and enhance habitat for aquatic species

• Enhance aesthetic and recreational values

• Largest human contributions• Channel incision • Roads and stream crossings• Surface erosion from vineyards• Urban stormwater runoff• Landslides

TMDL aims to reduce human contributions by 81%, or

52,000 tons/year

WQ Approach – Sonoma Creek Pathogens

• TMDL completed in 2006• Prompted due to exceedances within

Sonoma Creek and tributaries• Goals

• Minimize human exposure to waterborne pathogens

• Protect beneficial uses for recreational activities (wading, swimming, fishing, rafting)

• Largest source contributions• Septic systems• Sanitary sewer & WWTP• Municipal runoff• Grazing lands & dairies• Wildlife (not significant)

Potential to incorporate SWRP actions related to

municipal runoff & runoff from agricultural lands

WQ Approach – Sonoma Creek Nutrients

• Noted as water quality limited as far back as 1975 Basin Plan

• 303(d) listed but recommended for de-listing in 2014

• Data collected 2002-2012• Only 1 site (S-36, Sonoma Creek @

Watmaugh) had exceedances for primary indicators of eutrophication

WQ Approach – Petaluma River Bacteria & Nutrients

• TMDL in progress, anticipated Fall 2018• Initial public meeting held June 2017• Prompted to address current impairments• Goals

• Protect beneficial uses for recreational activities (wading, swimming, fishing, rafting), and habitat (cold & warm freshwater, and estuarine)

• Similar sources as Sonoma Creek• All stations exceed standards for pathogens• Nitrogen levels are well below established toxicity• No strong indication of eutrophication

WQ Approach – Urban Creeks Pesticide Toxicity

• TMDL completed in 2005• Prompted due to over 38 urban creeks

within SF Bay were found exhibiting pesticide-related aquatic toxicity

• Goals• Eliminate aquatic toxicity• Promote integrated pest management• Focus on proactive regulation, education and

outreach, and research and monitoring

• Allocations were only established for urban runoff and the TMDL does not consider agricultural sources

WQ Approach – MS4 Permit

• Planning area within Phase II Small MS4 Permit• Population < 100,000 people

• Permit covers • cities of Sonoma and Petaluma• County areas under Sonoma PRMD and SCWA • “non-traditional MS4s” including Sonoma

Development Center and Sonoma-Marin Fair• Stormwater requirements

• Specific BMP and management measure requirements• Inspection and post-construction assessment of BMPs• LID requirements for new and re-development• Hydromodification control

WQ Approach – BMP Types

• Focus on volumes & concentrations– % removal is a poor measure of

BMP performance

• Total load reduction can be estimated in several ways– Best way through careful

monitoring of volume and concentration in and out of a BMP (rarely happens – limited data)

– Overviews of performance by BMP category and common pollutant type

• Two main types of BMPs– Volume reduction – No volume reduction

Project Submission and Prioritization Overview

• Projects are the mechanism by which SWRP goals are achieved, including water quality

• So how do you get your projects submitted?

• And how do we turn them into a prioritized list?

Project Submission

• Input form: – See hyperlink at http://www.scwa.ca.gov/SWRP/

Project Submission

• Live input form walk through• Initial responses by August 10, 2017

– Note: it will be useful to have these early, but not required for inclusion in the SWRP.

• Final responses required by September 12, 2017

Project Screening for Eligibility

• Located within the planning boundaries of the SWRP• Minimum requirements – meet two main benefits

Project Prioritization

Proposed Prioritization Approach:

• Simple criteria to provide quantitative scores to most projects based on type of benefits provided, possibly geographic location. (Initial Quantification: Step 2)

• Additional points available when enough is known about a project to define expected benefits in more detail. (Detailed Quantification: Step 3)

Example flowchart for Water Supply

Project Prioritization

Draft Benefit Criteria & Weighting

• Draft benefit criteria were developed for TAC input

• 2-step process– Finalize criteria list to be used for projects– Finalize weighting approach to be used in quantification

• Meeting goal is to finalize benefit criteria list

• Also obtain input on weighting strategy to assist in prioritization. – Survey will be sent to TAC within 1-2 weeks

Draft Benefit Criteria

Draft Benefit Criteria

• Draft Water Quality Criteria– Green (Step 2), Orange (Step 3)

Benefit Category

Benefit Criteria

Water Quality

Addresses constituents covered by TMDL or included in 303(d) listingPollutant load removal through filtration and/or treatmentAmount of pollutant load removed through filtration and/or treatmentStormwater diversion through infiltration and/or evapotranspirationVolume of stormwater diverted through infiltration and/or evapotranspirationReduction in runoff volumes greater than minimums required by existing guidance Project previously identified as strategy in current TMDL or Basin PlanProject is located in high priority drainage area based on priority WQ assessment and high loading potential

Main benefits shown in bold.

Draft Benefit Criteria

• Draft Water Supply Criteria– Green (Step 2), Orange (Step 3)

Benefit Category

Benefit Criteria

Water Supply

Stormwater collected, stored, and diverted for irrigationVolume of stormwater collected, stored, and diverted offsetting irrigation useStormwater infiltrated into water supply aquiferVolume of stormwater infiltrated into water supply aquiferStormwater infiltrated into non-water supply aquiferVolume of stormwater infiltrated into non-water supply aquiferProject previously identified as water supply/conservation project in any watershed planning document

Main benefits shown in bold.

Draft Benefit Criteria

• Draft Flood Management Criteria– Green (Step 2), Orange (Step 3)

Benefit Category Benefit Criteria

Flood Management

Peak flow reductionMagnitude of peak flow reductionModeling completed to ensure detention will not result in increased flooding due to timing considerationsReduces flooding problem known to occur locallyProject previously identified to reduce flood risk in local flood management plan, master plan, or watershed plan

Main benefits shown in bold.

Draft Benefit Criteria

• Draft Environmental Criteria • Green (Step 2), Orange (Step 3)

Benefit Category Benefit Criteria

Environmental

Creation or enhancement of wetlands and/or riparian habitatArea of wetlands and/or riparian habitat created or enhancedSlowing in timing of peak flowMagnitude of slowing in timing of peak flow (minutes or hours)Water temperature improvement for benefit of habitats and endangered/threatened speciesMagnitude of water temperature improvement Increase in streamflows during low flow season for benefit of habitats and endangered/threatened speciesMagnitude of increase in streamflows during low flow season Reduction in energy use or GHG emissions, or increase in carbon sinksMagnitude of reduction in energy use or GHG emissions, or increase in carbon sinksCreation of urban green spaceArea of urban green space addedProject previously identified in conservation, restoration, watershed management, urban greening and/or other watershed-based plan

Main benefits shown in bold.

Draft Benefit Criteria

• Draft Community Criteria– Green (Step 2), Orange (Step 3)

Benefit Category

Benefit Criteria

Community

Recreational and public use areas enhanced and/or createdArea of recreational and public use areas enhanced and/or createdCommunity involvement and/or volunteer opportunitiesNumber of persons engaged with through community involvement and/or volunteer opportunitiesJob creationNumber of jobs createdPublic education opportunities and/or incorporation of a public education elementProject was previously identified in a community, recreational, education, development, active transportation, job opportunity plan and/or another watershed-based planProject is located in disadvantaged community

Main benefits shown in bold.

Weighting

Benefit Categories

Environmental

Flood Management

Community

Water Supply

Water Quality

Weighting

Project A Project BBenefit Categories

Environmental

Flood Management

Community

Water Supply

Water Quality

Weighting

Project A Project BBenefit Categories

Environmental

Flood Management

Community

Water Supply

Water Quality

Weighting

Project A Project BBenefit Categories

Environmental

Flood Management

Community

Water Supply

Water Quality

Weighting

Options:• By Benefit Category• By Main Benefit• By detailed benefit criteria• By geography

Recommendations• Keep it simple! • Weight only benefit categories

Benefit Categories

Environmental

Flood Management

Community

Water Supply

Water Quality

Weighting

• Are there one or more benefit categories, or main benefits, that you think should be given higher priority?

• Are there certain geographies that should be given more priority in general, or for certain benefit outcomes?

• How much additional priority should projects on public lands be given (Guidelines require some)?

• Are there any other values that should be accounted for in the prioritization scheme?Public Lands

Benefit Categories

Environmental

Flood Management

Community

Water Supply

Water Quality

Weighting

• We will follow up this meeting in 1-2 weeks with an online survey to solicit your detailed input on weighting.

Public Lands

Benefit Categories

Environmental

Flood Management

Community

Water Supply

Water Quality

Public Outreach Strategy

• Hold two community meetings to solicit input from stakeholders on projects and prioritization in both Petaluma and Sonoma in October

• Develop Public Outreach and Education Plan for implementation strategy within the SWRP for TAC review, submit Nov 2017

• Public Outreach techniques will include:• Develop messages for SWRP Purpose• SWRP Plan info on Water Agency website • Hold community meetings to solicit input and support• Produce educational materials• Send email broadcasts• Develop social media strategy

Next Steps

• Keep eye for benefit weighting survey and invite to public lands map

• Prepare initial project descriptions in by August 10, final due by September 12

• TAC meeting 3: September 20th?• Add data to Google Drive, or send to

southernsonomaswrp@gmail.com