Background on Contaminant Migration and Exposure Pathways - - PowerPoint PPT Presentation

▶
background on contaminant migration and exposure pathways
SMART_READER_LITE
LIVE PREVIEW

Background on Contaminant Migration and Exposure Pathways - - PowerPoint PPT Presentation

Aug 16, 2022 281 likes •715 views

Background on Contaminant Migration and Exposure Pathways Presentation to the LTMS August 28, 2007 By: Brian Ross, USEPA Figure 7-1. Illustration of locales or conditions for volatile emissions from CDFs Delta Island Hydrology & Dredged

slide-1
SLIDE 1

Background on Contaminant Migration and Exposure Pathways

Presentation to the LTMS August 28, 2007

By: Brian Ross, USEPA

slide-2
SLIDE 2
slide-3
SLIDE 3
slide-4
SLIDE 4
slide-5
SLIDE 5
slide-6
SLIDE 6

Figure 7-1. Illustration of locales or conditions for volatile emissions from CDFs

slide-7
SLIDE 7
slide-8
SLIDE 8

Delta Island Hydrology & Dredged Sediment Chemistry

Presentation to the LTMS August 28, 2007

By: Steven Michelson Applied Water Resources Corporation Walnut Creek, CA 925 938 1600

slide-9
SLIDE 9

August 28, 2007

Remedy for Sediment Dilemma

(adapted from Jeffery Steevens, ERDC)

Management

“Use science to tell us the right level”

Regulatory Agencies

“Let’s look at the regulations”

Scientists

“It depends…”

Environmental Groups

“No level is low enough”

Politicians

“Any level is OK, if this problem will only go away”

slide-10
SLIDE 10

August 28, 2007

Outline (science approach)

Delta Island Hydrology Delta Island Ground Water Delta Island Drainage Ditch Water Sediment characterization

Based on Roberts No. 1 and adjacent Deep Water Ship Channel

slide-11
SLIDE 11

August 28, 2007

DELTA

Stockton Deep Water Ship Channel Roberts Island Rough and Ready Island

slide-12
SLIDE 12

August 28, 2007

slide-13
SLIDE 13

August 28, 2007

Schematic – delta island hydrology

slide-14
SLIDE 14

August 28, 2007

Pump House Deep Water Ship Channel Mokelumne Aqueduct Burns Cutoff

ROUGH & READY ISLAND

Black Slough Roberts

  • No. 1

Roberts

  • No. 2

San Joaquin River

LOWER ROBERTS ISLAND

slide-15
SLIDE 15

August 28, 2007

Roberts No. 1

slide-16
SLIDE 16

August 28, 2007

Roberts Island Drainages near RN1

slide-17
SLIDE 17

August 28, 2007

slide-18
SLIDE 18

August 28, 2007

slide-19
SLIDE 19

August 28, 2007

slide-20
SLIDE 20

August 28, 2007

slide-21
SLIDE 21

August 28, 2007

slide-22
SLIDE 22

August 3, 2006

Ground Water Quality

slide-23
SLIDE 23

August 28, 2007

Background Transect

slide-24
SLIDE 24

August 28, 2007

slide-25
SLIDE 25

August 28, 2007

slide-26
SLIDE 26

August 28, 2007

Specific Conductance in RN1 Peat Layer Monitor Wells Background Transect includes all field measurements since 9/05

1000 2000 3000 4000 5000 6000 7000 500 1000 1500 2000 2500 3000 Distance from River (feet) Specific Conductance (µS/cm) MW-9p MW-10p MW-11p

slide-27
SLIDE 27

August 28, 2007

Specific Conductance Sand Layer Wells, Background Transect - includes all field measurements since 9/05

500 1000 1500 2000 2500 3000 3500 4000 4500 5000 500 1000 1500 2000 2500 3000 Distance from River (feet) Specific Conductance (µS/cm)

MW-9s MW-10s MW-11s

slide-28
SLIDE 28

August 28, 2007

Specific Conductance in RN1 - All Peat Layer Monitor Wells

includes all field measurements since 9/05

1000 2000 3000 4000 5000 6000 7000 500 1000 1500 2000 2500 3000 Distance from River (feet) S pecific C

  • nductance (m

icrosiem ens/cm )

MW-5p MW-7p MW-8p MW-9p MW-10p MW-11p MW-13p MW-15p MW-16p MW-17p MW-18p MW-19p MW-20p

slide-29
SLIDE 29

August 28, 2007

Specific Conductance in RN1 Sand Layer Monitor Wells, All Transects includes all field measurements since 9/05

500 1000 1500 2000 2500 3000 3500 4000 4500 5000 500 1000 1500 2000 2500 3000 Distance from River (feet) Specific C onductance (microsiemens/cm) MW-5s MW-6s MW-7s MW-8s MW-9s MW-10s MW-11s MW-13s MW-15s MW-16s MW-17s MW-18s MW-19s MW-20s

Edge of sediment 18s, 19s, 8s 6s, 13s, 20s, 7s 9s, 10, 11s

slide-30
SLIDE 30

August 3, 2006

Island Drainage – Water Quality

slide-31
SLIDE 31

August 28, 2007

Agricultural Irrigation Ditches at RN1

SW-1 SW-2 SW-3 SW-4 Main drain

slide-32
SLIDE 32

August 28, 2007

Ditch Water and Ground Water

5 10 15 20 25 30

Arsenic (µg/l) Lead (µg/l) Sodium (mg/l/10) Sulfate (mg/l/10) SC (µS/cm/100)

MW-6d MW-14d SW-3 Main Island Drainage Water Quality Goal

slide-33
SLIDE 33

August 3, 2006

Sediment Chemistry

slide-34
SLIDE 34

August 28, 2007

Source of Sediments…

River sediment naturally eroded from foothills

and Sierra Nevada

Deposited throughout Central Valley and Delta Anthropogenic impacts

Mining ‐ (Hg …) Agricultural ‐ (pesticides, herbicides, nitrates, organic carbon) Industrial ‐ (you name it…) Municipal Storm Water ‐ (petroleum, metals…)

slide-35
SLIDE 35

ARSENIC : in Sediment and Ground Water

10 20 30 40 50 60 70 80 90

REF (1) POS WC Docks (10) DWSC 04, 05, 05 (30) S4 Seds (5) Roberts Isl No.1 (21) MW-9P MW-10P, 11P MW-9S MW-10S, 11S DI WET DI WET DI WET DI WET GW Background Peat Background Sand RIVER PREDREDGE DREDGED ISLAND GROUND WATER Arsenic Concentration (µg/l, ppb)

WQG = 10 µg/l AG = 100 µg/l

slide-36
SLIDE 36

BARIUM : in Sediment and Ground Water

100 200 300 400 500 600 700 800 900 1000 REF (1) POS WC Docks (10) DWSC 04, 05, 05 (30) S4 Seds (5) Roberts Isl No.1 (21) MW-9P MW-10P, 11P MW-9S MW-10S, 11S DI WET DI WET DI WET DI WET GW Beckground Peat Background Sand RIVER PREDREDGE DREDGED ISLAND GROUND WATER

Concentration (µg/l, ppb)

WQG = 10 µg/l AG = 100 µg/l

slide-37
SLIDE 37

COPPER : in Sediment and Ground Water

10 20 30 40 50 60 70 REF (1) POS WC Docks (10) DWSC 04, 05, 05 (30) S4 Seds (5) Roberts Isl No.1 (21) MW-9P MW-10P, 11P MW-9S MW-10S, 11S DI WET DI WET DI WET DI WET GW Beckground Peat Background Sand RIVER PREDREDGE DREDGED ISLAND GROUND WATER Copper

Concentration (µg/l, ppb)

WQG = 10 µg/l AG = 100 µg/l

slide-38
SLIDE 38

LEAD : in Sediment and Ground Water

2 4 6 8 10 12 14 16 18 20 REF (1) POS WC Docks (10) DWSC 04, 05, 05 (30) S4 Seds (5) Roberts Isl No.1 (21) MW-9P MW-10P, 11P MW-9S MW-10S, 11S DI WET DI WET DI WET DI WET GW Beckground Peat Background Sand RIVER PREDREDGE DREDGED ISLAND GROUND WATER Lead

Concentration (µg/l, ppb)

WQG = 10 µg/l AG = 100 µg/l

slide-39
SLIDE 39

NICKEL : in Sediment and Ground Water

10 20 30 40 50 60 70 80 90 100

REF (1) POS WC Docks (10) DWSC 04, 05, 05 (30) S4 Seds (5) Roberts Isl No.1 (21) MW-9P MW-10P, 11P MW-9S MW-10S, 11S DI WET DI WET DI WET DI WET GW Beckground Peat Background Sand RIVER PREDREDGE DREDGED ISLAND GROUND WATER Nickel

Concentration (µg/l, ppb)

WQG = 10 µg/l AG = 100 µg/l

slide-40
SLIDE 40

ZINC : in Sediment and Ground Water

20 40 60 80 100 120 140 160 180 200

REF (1) POS WC Docks (10) DWSC 04, 05, 05 (30) S4 Seds (5) Roberts Isl No.1 (21) MW-9P MW-10P, 11P MW-9S MW-10S, 11S DI WET DI WET DI WET DI WET GW Beckground Peat Background Sand RIVER PREDREDGE DREDGED ISLAND GROUND WATER Zinc

Concentration (µg/l, ppb)

WQG = 10 µg/l AG = 100 µg/l

slide-41
SLIDE 41

August 28, 2007

SUMMARY

Delta Island Hydrology

Rivers recharge GW GW flows inland and is returned via ditches to river

Delta Island Ground Water

GW becomes more saline with distance inland GW in dredged sediments is similar to GW adjacent to river GW in dredged sediments is of better quality than inland GW

Delta Island Drainage Ditch Water

Of lower quality than GW in River and dredged sediments

Sediment characterization

DI WET tends to over‐predict potential impact to GW

slide-42
SLIDE 42

August 28, 2007

END