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There are no ecotoxicological data available for any of the streams in Category J.

The aquatic toxicity was estimated using the PETROTOX computer model, which combines a partitioning model (used to calculate the aqueous concentration of hydrocarbon components as a function of substance loading) with the Target Lipid Model (used to calculate acute and chronic toxicity of non-polar narcotic chemicals). PETROTOX computes toxicity based on the summation of the aqueous phase concentrations of hydrocarbon block(s) that represent a petroleum substance and membrane water partition coefficients (KMW) that describe the partitioning of the hydrocarbons between the water and organism.

The following short-term LL50s were estimated using the PETROTOX model:

Short-term toxiticity to fish: 96-hr LL50 value for Onchorhynchus mykiss = 1.1 mg/L.

Short-term toxicity to invertebrates: 48-hr LL50 value for Daphnia Magna = 1.99 mg/L.

Toxicity to algae: 72 -hr LL50 value for Pseudokirschneriella subcapitata = 0.79 mg/l

Toxicity to microorganisms: 3 -hr LL50 value for activated sludge = 28.99 mg/l

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