Kennecott north facilities soils and wastewater treatment plant ponds site removal action correspondence and documents, 1998-2000

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- Ecological Risk Assessment Northern _Oquirrh Mountains 1 Table 3. Estimated wildlife toxicity threshold values based on the lowest observable adverse effects level (LOAEL) and the highest no observable adverse effects level (NOAEL) below the LOAEL for each I, trophic group (expressed as ppm dry weight in the diet). As Herbivorous 112 NOAcL ------- birds 10 1------- ... LOAEL I nsectivorous Cd ----- 12 200 birds Se 500 100 4 800 1,000 5 Zn II 125 ... ----- ... ----- L... _____ ----- 250 94 NOAEL ------- II Pb Cu 1------- .... ----- ----- ----- 10- _____ ----- L.OAEL Carnivorous 448 NOAEl ------- birds ... ---- Ruminants NOAEl ------- Herbivorous ... ----- ..__---- 10- 15 285 1,000 ----- 570 30 38 50 47 250 30 50 425 325 NOAEL mammals 30 1------- ----- ... ----- ... NOAEL ------- 10 1....----- ----- 30 4 ..... 250 ----- 4.8 140 6 110 ..... _---- -----..., 10 NOAEL ------- 1,000 -----II II LOAEL Invertebrates 500 6.4 ------ ----- .... ---_ ..... ------ NOAEl ------- mammals 750 10 LOAEL Carnivorous 692 ------ ... ----- 10------- t-o----""""!' ,.._----- ,._----- ------ ----- LOAEL Insectivorous _____ lOAEL ------- mammals ... 10 LOAEL 4 ------- LOAEL ------ 100 11 ------- ..... ----- 160 38 300 550 ------ 355 ..... _---- 7.2 ,_----- 1....----- 500 ------ 1,500 150 ------ 5,000 The following information was added to the data from the Screening Level EcoRA (ep and t 1995a): The Se NOAEL for herbivorous birds has been modified from the Screening Level EcoRA based on the following studies. selenomethionine Heinz et a/. (1989) conducted a study with mallard reproduction, reporting no significant effects at 4 in the but decreased diet, ppm hatchling survival and increased probability of embryo malformation at 8 ppm. Hoffman and Heinz (1988) also fed mallards diets on containing selenomethionine, with decreased hatching success at 8 ppm, but no significant effects observed at 4 ppm in the diet. Consequently, the lowest LOAEL observed for Se for herbivorous birds remains 5 ppm, but the highest NOAEL below the LOAEL is 4 ppm. The Screening Level EcoRA did not determine NOAEL or LOAEL values for Cu in mammalian carnivores for Se in avian carnivores. Without these studies, the NOAEL has been set at 2.5 ppm. Aulerich et a/. (1982) conducted a study on the effects of Cu (as CUS04) on mink reproduction by amending a control diet (containing 60.5 ppm Cu, dry wt) with 25, 50, 100, and 200 ppm Cu. No effects were observed on adults or reproductive parameters up to 110 ppm (Le., 60.5 plus 50 ppm). At dietary concentrations of 160 ppm Cu and greater, there was an 10 ecological planning and toxicology, inc.