draft data - do not cite or quote sediment contamination sediment toxicity benthic community...
TRANSCRIPT
Draft data - do not cite or quote
Sediment contamination
Sediment toxicity
Benthic community structure
Results used to identify and map areas of unimpacted to clearly impacted sediments
Current RMP toxicity tests are those recommended for the accepted statewide SQO methods for bays and estuaries, EXCEPT…
Sediment Quality Assessment
Toxicity test data used in a weight-of-evidence:
Draft data - do not cite or quote
Excerpt from SQO Staff Report - Table 5.2List of candidate sediment toxicity tests
The SQO recommends the use of sediment water interface (SWI) samples
SpeciesTaxonomic
GroupDuration
(days) Matrix Endpoint(s) CitationAmpelisca abdita Eohaustorius estuarius Rhepoxynius abronius Leptocheirus
Amphipod 10Whole
sedimentSurvival
USEPA 1994,
ASTM 1996
Mytilus galloprovincialis Mussel 2Sediment Interface
Embryo development
Anderson et al. 1996
Draft data - do not cite or quote
Mussel embryo development
48-h exposureSublethal endpoint
Sediment elutriate VS. Sediment-water interface exposure
Draft data - do not cite or quote
In April-08 the TRC decided that the
RMP S&T will adopt the
sediment-water interface (SWI)
bivalve test in 2008
using intact sediment cores.
Draft data - do not cite or quote
Issues Considered
• Comparison to historic RMP/other programs
• Interpretation (Ecological Relevance)
• Cost
Draft data - do not cite or quote
Comparison to historic RMP data
1999 - 2001 Bivalve Methods Study
• 48-hr. sublethal development test
• Elutriate (1:4 dil. VS. SWI intact cores)
• 14 stations (52 samples).
Draft data - do not cite or quote
RiversGrizzly BayNapa RiverDavis Point
Coyote Creek
San Bruno Shoal
Horseshoe Bay
Redwood Creek South Bay
RMP 1999-2001 Elutriate & SWI bivalve development tests (N=52)
Station Code
0
20
40
60
80
100
1999-02 1999-07 2000-07 2001-08Crusie Number
% N
orm
al A
live
(Mytilus)
Elutriate
SWI (intact)
yellow = Toxic
BA10
0
20
40
60
80
100
1999-02 1999-07 2000-07 2001-08
BA21
0
20
40
60
80
100
1999-02 1999-07 2000-07 2001-08
BA41
0
20
40
60
80
100
1999-02 1999-07 2000-07 2001-08
BB15
0
20
40
60
80
100
1999-02 1999-07 2000-07 2001-08
BB70
0
20
40
60
80
100
1999-02 1999-07 2000-07 2001-08
BC11
0
20
40
60
80
100
1999-02 1999-07 2000-07 2001-08BC21
0
20
40
60
80
100
1999-02 1999-07 2000-07 2001-08
BC60
0
20
40
60
80
100
1999-02 1999-07 2000-07 2001-08
BD41
0
20
40
60
80
100
120
1999-02 1999-07 2000-07 2001-08
BD50
0
20
40
60
80
100
1999-02 1999-07 2000-07 2001-08
BF21
0
20
40
60
80
100
1999-02 1999-07 2000-07 2001-08
BG20
0
20
40
60
80
100
1999-02 1999-07 2000-07 2001-08
BG30
0
20
40
60
80
100
1999-02 1999-07 2000-07 2001-08
Yerba Buena Is
Red Rock
Alameda
C-3-0
0
20
40
60
80
100
1999-02 1999-07 2000-07 2001-08
San Jose (LEMP)
Draft data - do not cite or quote
0%
50%
100%
0%
50%
100%
0%
50%
100%
Rivers
Grizzly BayNapa RiverDavis Point
0%
50%
100%
0%
50%
100%
Redwood Creek
0%
50%
100%
Yerba Buena Island
Horseshoe Bay
Coyote Creek
San Jose
0%
50%
100%
Legend:
0%
50%
100%
Sampling Period (1993 to 2001)
Amph % Survival Biv % Norm. Dev.
Amphipod and Bivalve Sediment Toxicity Results 1993-2001(BF21)
Pulse of the Estuary, 20030%
50%
100%
0%
50%
100%
0%
50%
100%
South Bay(BA21)
Draft data - do not cite or quote
Interpretation• SWI tests are thought to be more
ecologically relevant
• However, not much in known about contaminant flux and exposure
• SCCWRP study (4 samples) to determine if homogenized sediments can be left to equilibrate and used in the SWI test.
Draft data - do not cite or quote
Current Status• RMP S&T 2008 will switch to collecting
intact cores for the SWI bivalve development test to be comparable to recommended SQO methods that have been endorsed by a panel of national experts
This will result in a NEW toxicity measure and will not be comparable with historic RMP data (largely an issue in Suisun Bay & Lower South Bay Regions)
Draft data - do not cite or quote
Question for EEPSShould the RMP continue the bivalve elutriate
tests in Suisun Bay and Lower South Bay Regions?
+ evaluate chemistry in the overlying water of both tests to begin to understand differences in contaminant exposure between intact cores and homogenized sediment elutriates
Draft data - do not cite or quote
RiversGrizzly BayNapa RiverDavis Point
Coyote Creek
San Bruno Shoal
Horseshoe Bay
Redwood Creek South Bay
RMP 1999-2001 Elutriate & SWI bivalve development tests (N=52)
Station Code
0
20
40
60
80
100
1999-02 1999-07 2000-07 2001-08Crusie Number
% N
orm
al A
live
(Mytilus)
Elutriate
SWI (intact)
yellow = Toxic
BA10
0
20
40
60
80
100
1999-02 1999-07 2000-07 2001-08
BA21
0
20
40
60
80
100
1999-02 1999-07 2000-07 2001-08
BA41
0
20
40
60
80
100
1999-02 1999-07 2000-07 2001-08
BB15
0
20
40
60
80
100
1999-02 1999-07 2000-07 2001-08
BB70
0
20
40
60
80
100
1999-02 1999-07 2000-07 2001-08
BC11
0
20
40
60
80
100
1999-02 1999-07 2000-07 2001-08BC21
0
20
40
60
80
100
1999-02 1999-07 2000-07 2001-08
BC60
0
20
40
60
80
100
1999-02 1999-07 2000-07 2001-08
BD41
0
20
40
60
80
100
120
1999-02 1999-07 2000-07 2001-08
BD50
0
20
40
60
80
100
1999-02 1999-07 2000-07 2001-08
BF21
0
20
40
60
80
100
1999-02 1999-07 2000-07 2001-08
BG20
0
20
40
60
80
100
1999-02 1999-07 2000-07 2001-08
BG30
0
20
40
60
80
100
1999-02 1999-07 2000-07 2001-08
Yerba Buena Is
Red Rock
Alameda
C-3-0
0
20
40
60
80
100
1999-02 1999-07 2000-07 2001-08
San Jose (LEMP)
Draft data - do not cite or quote
CostCost
EstimateAdditional
Cost Description
Current Tests: $39,814 - Amphipod & Bivalve Elutriate test @ 27 stations
Adopt SWI tests: $40,360 $545 Amphipod & Bivalve SWI test @ 27 stations
Adopt SWI tests & add Elutriate
test at SB & LSB stations:
$46,824 $7,009 Amphipod & Bivalve SWI test @ 27 stations Plus Bivalve Elutriate test at 10 stations
Draft data - do not cite or quote
Cost
Toxicity TestCost per Sample Total Samples
Total for Task
(incl. OH)
Amphipod Eohaustorius Toxicity Test $820 27 $22,361with Solid-Phase Sediment
Bivalve Embryo/Larval Toxicity Test $640 27 $17,453with Sediment Elutriates
Bivalve Embryo/Larval Toxicity Test $660 27 $17,998at the Sediment-Water Interface (SWI)
Sampling costs will not increase beyond budget
$20 more per sample