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Experience EXPERIENCETOXICITY & BIOACCUMULATION TESTING
Sediment Testing

Monitoring of Wetland Sediment Toxicity under the Bay Protection and Toxic Clean-up Program
As part of an on-going evaluation of tidal marsh sediment quality, Pacific EcoRisk has performed numerous solid-phase sediment tests with the amphipod Eohaustorius estuarius, 28-day sediment bioaccumulation tests with the bivalve Macoma nasuta, bivalve embryo tests of sediment porewater, and sediment-water interface testing with fish embryos. This project included extensive characterization of both sediment , sediment elutriate, and sediment porewater chemistry.

 
     
     

Monitoring of Wetland Sediment Toxicity at the Mare Island Naval Shipyard
As part of an ongoing ecological risk assessment of wetlands at Mare Island, Pacific EcoRisk performed toxicity evaluations of surface water and sediment samples collected from the wetlands. These evaluations consisted of performing chronic water toxicity tests with the crustacean Ceriodaphnia dubia and the echinoderm (Dendraster excentricus) embryo development tests, as well as performing 10-day bulk sediment toxicity tests with the freshwater amphipod Hyalella azteca.

 
     
     

Monitoring of Sediment Toxicity at the Oakland Army Base
As part of an on-going project, Pacific EcoRisk is performing a wide variety of sediment tests as part of an investigation at the Oakland Army Base, including: sediment-water interface bivalve embryo development tests, 10-day amphipod sediment toxicity tests, and sediment bioaccumulation tests with Macoma and polychaetes.

 
     
     

Monitoring of Sediment Toxicity off the Alameda Naval Air Station
As part of the US Navy CLEAN II Program, Pacific EcoRisk successfully performed numerous solid-phase sediment toxicity tests with the amphipod Eohaustorius estuarius, 28-day sediment toxicity tests with the polychaete Neanthes arenacoedentata, 28-day sediment bioaccumulation tests with the bivalve Macoma nasuta, and sediment water interface tests with fish embryos.

 
     
     

Evaluation of Freshwater Sediment Toxicity at McClellan Air Force Base
As part of a preliminary investigation in the potential for sediment toxicity in two creeks running through McClellan Air Force Base, Pacific EcoRisk performed numerous acute sediment toxicity tests with the insect Chironomus tentans, experimental chronic toxicity tests with the amphipod Hyalella azteca, and bioaccumulation tests with the oligochaete Lumbriculus variegatus.

 
     
     

Monitoring of Sediment Toxicity off the Pt. Molate Naval Fuel Depot
As part of the US Navy CLEAN II Program, Pacific EcoRisk successfully performed numerous solid-phase sediment toxicity tests with the amphipod Eohaustorius estuarius, sediment water interface tests with the mysid shrimp Mysidopsis bahia and fish embryos. sediment water interface tests with fish embryos.

 
     
     

Monitoring of Off-Shore Sediment Toxicity under the Bay Protection and Toxic Clean-up Program
As part of an on-going evaluation of off-shore sediment quality, Pacific EcoRisk has performed numerous solid-phase sediment tests with the amphipod Eohaustorius estuarius, including extensive evaluation of ammonia and sulfide as contributing toxicity factors.

 
     
     

Monitoring of Sediment Toxicity at Concord Naval Weapons Station
As part of the US Navy CLEAN Program, Pacific EcoRisk successfully collected sediment samples and performed numerous sediment water interface tests with fish embryos. This included extensive analysis of the toxicity of ammonia to the fish embryos.

 
     
     

Toxicity Evaluation of Petroleum Hydrocarbon-Contaminated Soils at the Presidio of San Francisco
As part of the National Parks Service recreation of historical wetlands at the Presidio of San Francisco, Pacific EcoRisk is evaluating the toxicity risk posed by soils and groundwaters which have been contaminated with petroleum hydrocarbons during the previous military use of the Presidio. These evaluations include marine sediment toxicity tests, and sediment-elutriate testing using mysid shrimp and the bivalve embryo development test.

 
     
     

SUPERFUND (CERCLA) Toxicity Testing of Metals-Contaminated Sediments
As part of a CERCLA evaluation of acid mine drainage, Pacific EcoRisk performed toxicity evaluations of sediment porewater and sediment elutriates contaminated with high concentrations of several heavy metals. This included performance of sediment porewater TIEs to determine the cause(s) of any observed toxicity.

 
     
     

Environmental Assessment of Petroleum Hydrocarbon-Contaminated Sediments in an Alpine Stream System
In response to an oil spill in a pristine alpine stream feeding into Lake Tahoe, Pacific EcoRisk is evaluating the effects of stormwater runoff and of contaminated sediments at the site. These evaluations include the use of an innovative short-term trout survival and growth test, as well as several standardized freshwater tests.

 
     
     

Development of Guidelines for Interpretation of Artifactual Toxicity in Sediment Toxicity Tests
Developed sediment toxicity data base, and then designed and performed experiments to determine the toxicity of artifactual causes of sediment toxicity (e.g. naturally-present ammonia) using standard sediment toxicity test endpoints.

 
   
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