DTMC Discussion Delta RMP Mercury Monitoring Design

Transcription

1 DTMC Discussion Delta RMP Mercury Monitoring Design April 15, 2014 At DWR Jay Davis, Ph.D. Stephen McCord, Ph.D., P.E.

2 Overview Delta RMP process & people Initial Hg monitoring focus Available information Monitoring design ideas Q & A 2

3 DELTA RMP PROCESS & PEOPLE 3

4 RMP Org. Structure Steering Committee (SC) Role: Receive updates and provide input into RMP management; guide annual monitoring plan, budget, contracts, and monitoring report Lead: Chair & Vice-Chair? Vote: RMP Participants (Man. staff) Facilitate (Brock B.): SC meetings Support: RMP Lead Entity, TAC Chair(s) RMP Lead (Thomas) Role: Manage the RMP on a daily basis; report to the SC; ensure SC directions are followed; manage Workgroups RMP Manager (Meghan S.) Role: Admin. ASC contract; support meetings; RegBd liaison RMP Lead Entity (ASC) Role: Provide administrative assistance to RMP Lead for IT support, accounting, contracting Technical Advisory Committee (TAC) Role: Provide technical assist. to SC and RMP Lead; coordinate monitoring; direct Tech. Subgroups Leads: SAM, JD Members: SC assignments (Tech. staff/consultants) Technical Subgroups Role: Focus on topics as directed by TAC Leads: SM, JD, DD, BL Participants: RMP Participants, TAC, collaborators, and topical experts Initial Priorities: Hg, Nutrients, Pest., Pathogens Future Options: Monitoring Coordination, Nutrient Management, Model development, Grant proposal Science Advisors / Experts Role: Review or advise on specific issues Contractors Role: Support the RMP (SC or TAC) as directed (scoped, scheduled, budgeted) under contract through RMP Lead Entity

5 Hg Subgroup Members Name Affiliation Key Input Stephen McCord MEI TAC Lead Jay Davis SFEI Staff Lead Janis Cooke RWQCB regulator per TMDL Karen Ashby LWA Stormwater, wastewater Mark Stephenson CDFW Open water modeling Wes Heim Moss Landing ML NPS monitoring Carol DiGiorgio DWR Open water, water managers Tony Pirondini Vacaville WRF CVCWA special study JR Flanders URS river monitoring design Jacob Fleck USGS cycling, monitoring Darell Slotton UCD biota Vyomini Upadhyay SRCSD Sac CMP April Robinson SFEI support staff 5

6 TMDL Collaborating Groups Open Water Workgroup CVCWA Wastewater Phase I & II MS4s NPS Workgroup & Ag Coalitions Cache Cr Settling Basin studies Dredgers Links to BiOp, BDCP, CVFPP 6

7 Mercury Subgroup Focus Orient Design & budget (ACK!) Priorities Collaborations Redesign & budget (Woo-hoo!) 7

8 Re-assess MeHg allocations & schedules Attain Allocations Long-term Schedule Phase 1 Phase 2 Effective Date TMDL Review ~ Control studies Pollution prevention Exposure reduction Discharge monitoring Implement methylmercury controls Statewide FTO Reservoirs TMDL Upstream TMDLs Pilot offsets projects

9 INITIAL HG MONITORING FOCUS 9

10 Assessment Questions (Draft) Status and Trends: Is there a problem or are there signs of a problem? What are the status and trends in ambient concentrations of inorganic mercury and methylmercury in water, sediment and fish, particularly in subareas likely to be affected by major sources or new sources (e.g., largescale restoration projects)? 10

11 Assessment Questions (Draft) Are trends over time similar or different among Delta subareas? How are methylmercury concentrations in Delta subareas associated with existing sources, activities, and events? Are there important data gaps associated with particular water bodies or Delta subareas? How are conditions affected by variability in climate, hydrology, and ecology? 11

12 Regulatory Driver TMDL Open water sediment flux Dredging sediment release Discharge permittees loads Wetlands & flood control loads 12

13 Mercury Monitoring Reg. & Man. Drivers

14 AVAILABLE INFORMATION 14

15 Guiding Information MeHg Info Packet Delta MeHg TMDL CV Monitoring Directory CWQMC Estuaries Portal Proposed POTW monitoring sites 15

16 Conceptual Models More complex TMDL linkage analysis Pulse of the Delta (2012) graphic CALFED Mercury Program* Delta Regional Ecosystem Restoration Implementation Plan (DRERIP) 16

17 Bass Hg (mg/kg) MeHg Linkage: Largemouth Bass & Average Water MeHg (unfilt) 1.0 y = x R 2 = 0.91 Mokelumne R Central Delta Water MeHg (ng/l) 17

18 CALFED Conceptual Model 18

19 Continuous Monitoring Stations 19

20 Water MeHg Monitoring Stations: NPDES and SF Bay RMP Source: Central Valley Monitoring Directory 20

21 Aqueous and Largemouth Bass MeHg Sampling Locations Used in the TMDL Linkage Analysis 21

22 Sport Fish Monitoring Locations, : All Species Source: My Water Quality portal 22

23 Sport Fish Monitoring Locations, : Largemouth Bass Source : My Water Quality portal 23

24 Small Fish Monitoring Locations: 1999 Source: UCD (Slotton) CALFED Report 24

25 Small Fish Monitoring Locations: Source: FMP Fact Sheet 25

26 Sediment Monitoring Locations (MeHg) Source: Heim et al

27 PRELIMINARY MONITORING DESIGN IDEAS 27

28 Types of Monitoring Sportfish (TMDL objectives, exposure) MeHg_aq (linkage to sources) Tribs & discharges (sources) Sediments (processes) Biosentinels (effects) 28

29 $cale of Monitoring Status & Trends update Answer more assessment questions Calibrate & validate open water simulation models Repeat CALFED & Fish Mercury Projects 29

30 (a) Project D-MCM Version 4 Yolo Bypass (b) Wetland Cell (c) Group of cells One water compartment Four sediment compartments

31 Placeholder for some DWR modeling slides 31

32 32

33 Modeling Data Needs Delta and Bypass Delta Yolo Bypass Particles (organic and inorganic): Tributary inflows Settling & resuspension Long term burial. Grain size distribution Organic content Bed load mass and movement Sediment bed properties: Porosity + density Organic carbon and porewater chemistry Mercury concentrations: THg + MeHg concentrations (dissolved and particulate) and partitioning in water and sediment Mercury fluxes: Hg settling/resuspension Sorption and desorption Hg and particles THg/MeHg flux from sediment to water Water Quality ph Sulfate DOC or type of DOC? Particle fluxes: External loads Settling and Resuspension Long term burial Grain size distribution Organic content Plant biomasses and particle fluxes Sediment bed properties: Porosity + density Organic carbon and porewater chemistry Mercury concentrations: THg + MeHg concentrations (dissolved and particulate) and partitioning in water and sediment Vegetation Total Hg and MeHg concentrations Mercury fluxes: Hg settling/resuspension Sorption and desorption Hg and particles THg/MeHg flux from sediment to water Vegetation based THg & MeHg fluxes Effects of wetting and drying Water Quality ph Sulfate DOC or type of DOC? 33

34 Q & A 34

35 Discussion Questions What do you think of the initial focus (type & scale, questions) of monitoring? Who is monitoring/studying Hg in the Delta now & how could we collaborate? What special studies would address the most important knowledge gaps? Anything else? 35

36 For more information Stephen McCord McCord Environmental, Inc

37 EXTRAS 37

38 Open Water Sediment (2.4) Delta MeHg Load Balance-TMDL Wetland Sediments (2.7) Mun. & Ind. Wastewater (0.6) Agric. Tailwater (0.3) Atmos. Dep. (0.06) Urban Runoff (0.05 Tributaries (8.2) Delta/Yolo Bypass MeHg Budget (g/yr) Water Projects (-1.1) SF Bay (-4.7) Dredging (-0.9) Photodeg. & Sedimentation (-7.6)

39 Delta MeHg Load Balance-CALFED Atmospheric Dep. <0.1 g/day Ag Return Flows 0.3 g/day Open Water Sediment Flux 0.5 g/day Wetlands Sediment Flux 0.2 g/day Municipal WWTPs 0.6 g/day Urban Runoff 0.1 g/day Tributary Inputs 16.6 g/day Delta MeHg Budget (g/yr) Water Exports -1.5 g/day SF Bay -9.8 g/day Unknown Gain 1.4 g/day Sedimentation -4.9 g/day Photodemethylation -2.5 g/day Dredging -0.9 g/day