Computerization of the Decision-Making Framework: Effluent Toxicity Bioassay Test Results (LAT-E Program)
Abstract
The Decision-Making Framework (DMF) for the management of dredged material has been developed and used at several sites (Lee and others 1991). Among the many components of the DMF is effluent water quality, which is one pathway that is investigated when confined disposal is considered. Two components are used to evaluate effluent quality: the modified elutriate test (Palermo 1985) and the water column bioassay test for acute toxicity (U.S. Environmental Protection Agency/U.S. Army Corps of Engineers (USEPA/USACE) 1994). Evaluation of these test results has now been computerized as part of the Automated Dredging and Disposal Alternatives Modeling System (ADDAMS) (Schroeder and Palermo 1995). The modified elutriate test is evaluated using the EFQUAL module (Palermo and Schroeder 1991), and the bioassay test is analyzed by the LAT-E module (Laboratory Analysis of Toxicity from a CDF Effluent), which is described herein. The LAT-E program compares survival data for various aquatic organisms at several elutriate dilutions and computes the LC50 for the effluent. Using the LC50 and a mixing zone model, the toxicity of the discharge can be evaluated for compliance with water quality regulations. The purpose of this technical note is to introduce the LAT-E module.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1997
- Accession Number
- ADA381012