San Francisco Bay and Suisun

Sand Mining

BCDC Commission Briefing October 2018

Introduction BCDC Permit required Commission update on:

1. Mining Activity Summary 2. Bathymetric Trend Analysis 3. Benthic Study 4. Water Quality Study 5. Sediment Transport Study

Vicinity Map of Lease locations

Permits received April 29, 2015

# 1 - Mining Activity Summary

Mined Volumes: 626,768 cy

Avg Annual Permitted Volume:

1,141,000 cy

Peak Annual Permitted Volume:

1,395,000 cy

Annual Sand Mining Volumes: 2017 Hanson, Central Bay Leases

Hanson Central Bay

Volu

mes

, CY

1,400,000

1,200,000

1,000,000

800,000

600,000

400,000

200,000

0

Mining Activity Summary Annual Sand Mining Volumes: 2017

Suisun Bay Leases

Volu

mes

, CY

250,000

200,000

150,000

100,000

50,000

0

Lind Middleground

Peak Annual Permitted Volume

120,000 cy

Avg Annual Permitted Volume

100,000 cy

Mined Volume: 22,788 cy

Suisun Associates

Peak Annual Permitted Volume:

235,000

Avg Annual Permitted Volume:

185,000 cy

Mined Volume: 157,418 cy

900,000

800,000

700,000

600,000

500,000

400,000

300,000

200,000

100,000

-

Hanson, Central Bay

Suisun Associates

Middleground

2016 2017 2018 proj

Mining Activity Summary Vo

lum

es M

ined

, c.y.

Mining Volume Trends - 2016-2018

# 2 - Bathymetric Trend Analysis • Bathymetric Trend Analysis – Spring 2018 - Multibeam bathymetry survey – October 2018 – Report submitted

(a) Multibeam surveys of all lease areas and surrounding or reference areas,

(b) Analysis of changes in bathymetry (c) A quality control analysis completed by an

independent third party

Central Bay Change Analysis

Source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS, AeroGRID, IGN, and the GIS User Community

± 0 1 20.5

Kilometers Depth Change (m) 2014 to 2018

> -2 erosion

-1 to -2

-03 to -1

-0.3 - 0.3

0.3 - 1

1 to 2

> 2 m accretion

709 North

7779 West

2036

7779 East

709 East

709 South

7779 North

7780 South

, , , , , , , ,IGN, and the GIS User Community

Suisun Change Analysis

± Suisun Bay Depth Change (m) 2014 to 2018

> 2m erosion -1 to -2 -0.3 to -1 -0.3 - 0.3 0.3 - 1 1 - 2 > 2m accretion

0 1 20.5 Kilometers

Carquinez East

Carquinez West

Source: Esri DigitalGlobe GeoEye Earthstar Geographics CNES/Airbus DS USDA USGS AeroGRID

Middle Ground Change Analysis

22m accretion

Source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS, AeroGRID,IGN, and the GIS User Community

±Middle GroundDepth Change (m)2014 to 2018

> 2m erosion-1 to -2-0.3 to -1-0.3 - 0.30.3 - 11 ->

0 0.5 10.25Kilometers

Bathymetric Trend Analysis • Comparison of 2008 and 2014 data: – West-Central Bay and Suisun Bay: net trend of

accretion • Comparison of 2014 and 2018 data within lease

boundaries and surrounding environs: – West-Central Bay and Suisun Bay: net trend of erosion – Middle Ground: trend of accretion

• Next survey in 2023 will provide additional information

# 3 - Benthic Study Update • Benthic Technical Advisory Committee (TAC)

Members: – SF Bay Conservation and Development Commission – California State Lands Commission – US Army Corps of Engineers – SF Regional Water Quality Control Board – National Marine Fisheries Service – California Department of Fish and Wildlife – US Geological Survey - Biologist Specialist – Hanson Marine Operations & Lind Marine

Benthic Study Update • October 2015 – May 2016: TAC met on multiple

occasions to establish study objectives • March 2016 – TAC developed and approved RFP,

distributed to qualified entities • April 2016 - Received submissions • June 2016 - TAC reviewed each

proposal and selected NewFields to perform the Benthic Study

Benthic Study Update

• July 2016 – Newfields developed Sampling and Analysis Plan (SAP) per the RFP – SAP outlined the design, sampling schedule, sample

processing, data analysis, and other elements of the proposed project

– Robustness of data collected was emphasized such that adequate statistical analyses could be conducted

• August 2016 – TAC members reviewed and approved SAP

Benthic Study Update

• The Benthic Study was performed over two years: – October 2016 – Baseline sampling completed

– October 2017 – Second year sampling completed

• April 27, 2018 – Draft Final Report submitted to all TAC members

• The Draft Final Report is still being reviewed by TAC members

# 4 - Water Quality Monitoring Study • Study and analyses completed – Two seasons of sampling at three locations: • August 2015 and April 2016 • Central Bay, Middle Ground and Suisun Channel

• Effluent water samples were collected and analyzed September 2016 –

• Draft report submitted to SFRWQCB – Reviewed by BCDC and SFRWQCB

Water Quality Monitoring Study • September 6, 2018 - Revised report per

feedback, submitted to the SFRWQCB • –Study conclusion:

“Overall, the monitoring results from both surveys demonstrate that effluent from sand mining operations do not adversely impact the water column with regards to chemical concentrations or toxicity, and that any physical effects related to plume turbidity are spatially limited and ephemeral in nature.”

# 5 - Sediment Transport Study • Sediment Technical Advisory Committee (STAC)

Members: – SF Bay Conservation and Development Commission – California State Lands Commission – US Army Corps of Engineers – NOAA National Marine Fisheries Service – San Francisco BayKeepers – State Coastal Conservancy – California Coastal Commission – Greater Farallones Marine Sanctuary – Hanson Marine Operations & Lind Marine

Sediment Transport Study • Three funding installments deposited to State

Coastal Conservancy (SCC) – Fourth and final this year

• Management Questions developed by TAC • Study questions and design approach will be

developed by Independent Science Panel and make recommendations to the TAC

Sediment Transport Study • May 12, 2017 – Sediment TAC first meeting

• June 2018 - Sediment TAC formalized multiple Management Questions

• September 2018 – BCDC/SCC selected Science Study Coordinator with input from the TAC – RevellCoastal

• Target: BCDC/SCC to convene 1st Independent Science Panel meeting in January 2019

• Completed studies anticipated to inform both CEQA and permits

Questions?

IntroductionVicinity Map of Lease locations# 1 -Mining Activity Summary# 2 -Bathymetric Trend AnalysisCentral Bay Change AnalysisSuisun Change Analysis

# 3 -Benthic Study Update# 4 -Water Quality Monitoring Study# 5 -Sediment Transport Study