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Experience EXPERIENCETOXICITY & BIOACCUMULATION TESTING

Toxicity Identification Evaluations (TIEs)/Toxicity Reduction Evaluations (TREs)

NPDES Toxicity testing and Toxicity Identification Evaluation (TIE) of Municipal Effluent
As part of a special U.S. EPA investigation, Pacific EcoRisk was selected to perform acute and chronic toxicity testing of effluent produced by an “International” Wastewater Treatment Plant (from Tijuana, Mexico) which is discharging effluent into the United States through a special NPDES Permit. As part of this project, Pacific EcoRisk has performed several TIEs of the effluent, evaluating seasonal differences, and sources of toxicity.

 
     
     

Toxicity Identification Evaluation (TIE) of “Primary Treated” POTW Effluent
Performed TIEs to verify ammonia as the cause of toxicity in a POTW effluent. Performed subsequent specialized TIE manipulations to determine non-ammonia causes of the toxicity.

 
     
     

Toxicity Identification Evaluation (TIE) of a High-Ammonia POTW Effluent
Performed TIEs to verify ammonia as the cause of toxicity in a POTW effluent. Performed subsequent specialized TIE manipulations to determine non-ammonia causes of the toxicity.

 
     
     

Performance of a Chronic Toxicity Identification Evaluation (TIE) for an Oil Refinery
Identified the cause of chronic toxicity to Ceriodaphnia in the effluent being discharged from an oil refinery and determined appropriate management strategy.

 
     
     

Toxicity Identification Evaluation (TIE) of an Oil Refinery Effluent
Performed Phase I and Phase II procedures and successfully identified the class of compounds responsible for toxicity. Based on information generated in Phase I and Phase II manipulations, successfully implemented bench scale Toxicity Reduction Evaluations (TRE) to determine the effectiveness of possible treatment options.

 
     
     

On-site Toxicity Reduction Evaluation (TRE) of an Oil Refinery Effluent
In order to determine the efficacy of granulated activated carbon (GAC) in removing toxicity from an oil refinery effluent, Pacific Eco-Risk Labs performed on site bench-scale GAC treatment of the effluent, followed by toxicity testing with Mysidopsis bahia.

 
     
     

Development of Sediment Toxicity Identification Evaluation (TIE) Procedures
Development of TIE methods for identifying contaminants causing toxicity in estuarine/marine sediments using standard toxicity testing endpoints (amphipod survival, bivalve & echinoderm embryo development.)

 
     
     

Performed TIE Evaluation of Ambient Surface Water Impacted by Agricultural Practices
Screened ambient waters from several watersheds throughout California for aquatic toxicity. When toxicity was present, performed TIE that identified pesticides as the cause(s) of the toxicity.

 
     
     

Performed TIE Evaluation of Storm Water Runoff in San Francisco Bay Area
Screened ambient waters from several watersheds throughout the San Francisco Bay Area for aquatic toxicity. When toxicity was present, performed Phase I, II, and III TIE’s that identified pesticides as the cause(s) of the toxicity.

 
     
     

Performance of a Chronic Toxicity Identification Evaluation (TIE) for a POTW
Identified the cause of chronic toxicity to Ceriodaphnia in the effluent being discharged from an POTW and determined appropriate management strategy.

 
     
     

Performance of a Chronic Toxicity Identification Evaluation (TIE) for a POTW
Performed Phase I, II and III TIE procedures and identified the cause of chronic toxicity to Selenastrum in the effluent being discharged from an POTW. Toxicity was associated with the ionic matrix of the sample and not directly associated with traditional COCs . Based on these results an appropriate management strategy was implemented.

 
     
     

Performance of a Chronic Toxicity Identification Evaluation (TIE) for a POTW
Performed Phase I TIE procedures to characterize a municipal wastewater treatment plant effluent with Ceriodaphnia.

 
     
     

Performance of a Chronic Toxicity Identification Evaluation (TIE) for a POTW
Performed Phase I, II and III TIEs with larval fatheads. Successfully identified and confirmed the cause of chronic toxicity to larval fatheads in the effluent being discharged from an POTW and determined appropriate management strategy.

 
     
     

Performance of a Chronic Toxicity Identification Evaluation (TIE) for a POTW
Performed Phase I TIE on Selenastrum, involving standard TIE methods as well as investigation into the effects of hardness and various ions on Selenastrum.

 
     
     

Performance of a Chronic Toxicity Identification Evaluation (TIE) for a POTW
Performed Phase II and III TIEs with Ceriodaphnia and rainbow trout. Successfully developed a methodology for controlling pH in large volume test chambers, leading to the successful identification of ammonia as the toxicant to trout.

 
     
     

Development of Toxicity Identification Evaluation (TIE) Methods
Developed methodologies for TIE testing of three species of West coast bivalves for use in the identification of toxicants in marine and estuarine matrices.

 
   
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