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Studies were conducted to determine the applicability of using population responses to assess the impact of dredged material. Laboratory methods were successfully developed to continuously expose Ampelisca abdita and Mysidopsis bahia to bedded and suspended sediments throughout their life cycle. Biological effects, including survival, individual growth, reproduction, and intrinsic rate of population growth, were measured over a range of exposures to Black Rock Harbor dredged material (BRH). Short-term effects (96-hr LC50) were observed at BRH suspended sediment concentrations of 262 mg/1 and 80 mg/1 for M. bahia and A. abdita, respectively, while the 10-day LC50 for A. abdita was 10.5 mg BRH/1. Thus, A. abdita was three times more sensitive to the acute effects of BRH sediment than M. bahia. Acute toxicity in A. abdita was strongly time dependent with 10-day exposures showing an eightfold increase in toxicity compared to the 4-day toxicity data. This may be the result of A. abdita's more intimate contact with the contaminated sediments. This study demonstrates that chronic responses are the best predictors of environmental impacts.

FIELD VERIFICATION PROGRAM (AQUATIC DISPOSAL) US Environmental Protection Agency TECHNICAL REPORT D-87-3 THE ASSESSMENT OF BLACK ROCK HARBOR DREDGED MATERIAL IMPACTS ON LABORATORY POPULATION RESPONSES by John H. Gentile, K. John Scott, Suzanne M. Lussier, Michele S. Redmond Environmental Research Laboratory US Environmental Protection Agency Narragansett, Rhode Island 02882 Prepared for DEPARTMENT OF THE ARMY US Army Corps of Engineers Washington, DC 20314-1000 and US Environmental Protection Agency Washington, DC 20460 Monitored by Environmental Laboratory US Army Engineer Waterways Experiment Station PO Box 631, Vicksburg, Mississippi 39180-0631 11 BRARf SEP 1 BW Bureau ef ftectaM Öltf Denver, Cotoradö Destroy this report when no longer needed. Do not return it to the originator. The findings in this report are not to be construed as an official Department of the Army position unless so designated by other authorized documents. The contents of this report are not to be used for advertising, publication, or promotional purposes. Citation of trade names does not constitute an official endorsement or approval of the use of such commercial products. The D-senes of reports includes publications of the Environmental Effects of Dredging Programs: Dredging Operations Technical Support Long-Term Effects of Dredging Operations Interagency Field Verification of Methodologies for Evaluating Dredged Material Disposal Alternatives (Fieid Verification Program) K 3 .. mr Unclassified SECURITY CLASSIFICATION OF THIS PAGE REPORT DOCUMENTATION PAGE Form Approved OMB No 0704-0188 Exp. Date: Jun 30, 1986 1a. REPORT SECURITY CLASSIFICATION Unclassified 1 b. RESTRICTIVE MARKINGS 2a. SECURITY CLASSIFICATION AUTHORITY 2b. DECLASSIFICATION/DOWNGRADING SCHEDULE 3. DISTRIBUTION/AVAILABILITY OF REPORT Approved for public release; distribution unlimited. 4. PERFORMING ORGANIZATION REPORT NUMBER(S) 5. MONITORING ORGANIZATION REPORT NUMBER(S) Technical Report D-87-3 6a. NAME OF PERFORMING ORGANI

FIELD VERIFICATION PROGRAM C- I (AQUATIC DISPOSAL) P R O ^ C US Environmental Protection Agency TECHNICAL REPORT D-85-8 APPLICATION OF LABORATORY POPULATION RESPONSES FOR EVALUATING THE EFFECTS OF DREDGED MATERIAL by John H. Gentile, K. John Scott, Suzanne Lussier, Michele Redmond Environmental Research Laboratory US Environmental Protection Agency Narragansett, Rhode Island 02882 ARGON iu ic rT in u September 1985 Final Report Approved For Public Release; Distribution Unlimited TA 7 .W34t D-85-8 1985 US Army Corps of Engineers Prepared tor DEPARTMENT OF THE ARMY US Army Corps of Engineers Washington, DC 20314-1000 and US Environmental Protection Agency Washington, DC 20460 Monitored by Environmental Laboratory US Army Engineer Waterways Experiment Station PO Box 631, Vicksburg, Mississippi 39180-0631 L I B R A R Y ' NOV 0 8 ’85 Bureau of Reclamation Denver, Co5ofade Destroy this report when no longer needed. Do not return it to the originator. The findings in this report are not to be construed as an official Department of the Army position unless so designated by other authorized documents. ¿The contents of this report are not to be used for advertising, publication, or promotional purposes. Citation of trade names does not constitute an official endorsement or approval of the use of such commercial products. The D-series of reports includes publications of the Environmental Effects of Dredging Programs: Dredging Operations Technical Support Long-Term Effects of Dredging Operations interagency Field Verification of Methodologies for Evaluating Dredged Material Disposal Alternatives (Field Verification Program) SUBJECT: Transmittal of Field Verification Program Technical Report Entitled "Application of Laboratory Population Responses for Evaluating the Effects of Dredged Material" TO: All Report Recipients 1. This is one in a series of scientific reports documenting the findings of studies conducted under the Interagency Field Verification of Testing and Predictive