1.0 INTRODUCTION Vyl41DUl 



This document consists of a literature review and presents 

 candidate hazard levels for assessment of selected environmental 

 hazards associated with the East Helena smelter complex. A 

 substantial amount of material was reviewed but additional 

 material will no doubt be added to these data as the study 

 progresses. This document has been prepared specifically for the 

 Helena Valley, Montana area and use of this document for evalua- 

 tion of other sites should be done only after appropriate consid- 

 eration of site specific conditions. 



1 . 1 Purpose 



This document is a literature review from which hazard levels 

 were developed to assess potential risk to plants and livestock 

 from chemical element levels found in soil, plants, livestock and 

 water present in the vicinity of the East Helena smelter. These 

 hazard levels will enable determination of the potential danger to 

 these agricultural resources. It is the intent of this review to 

 assess only the potential risk to agricultural production. This 

 document does not address any subsequent risk to the human 

 population from consumption of these agricultural products. 



1.2 Scooe 



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The scope of this document (Volume 1) is confined to the 

 metals arsenic, cadmium, lead and zinc present in soil, water, 

 plants and livestock and their toxic affects to plants and 

 livestock. In addition, a brief discussion on the toxicology 

 mechanisms of these four metals to livestock and vegetation is 

 included. Volume 2 presents similar data for plants and soils for 

 the metals copper, mercury, selenium, silver and thallium. 



1.3 Methods 



Portions of the literature presented in this document were 

 procured through the use of a computer search utilizing numerous 

 data bases. Data bases utilized included AGRICOLA, BIOSIS, CAB 



