0141743 



5.2 Criteria from Coal Overburden Suitability for Root Zone 



Mater lal 



Because strip mining for coal in the western United States 

 increased significantly in the 1970s several state regulatory 

 agencies established guidelines for the analysis of soils and 

 overburden materials to determine their suitability as root zone 

 materials in revegetation attempts. Suitability guidelines and 

 suspect levels were set by some states and are shown in Table 48. 

 The levels for cadmium, lead and zinc established by Montana as 

 being suspect, have been rescinded, but not yet replaced. New 

 proposed guidelines are under consideration. 



5.3 Criteria for Defining Hazardous Wastes 



The Resource Conservation and Recovery Act (RCRA) set 

 criteria for determining if a waste is hazardous. Part of this 

 act defines the EP Toxicity Test (40 CFR) 261.24, 19 May 1980). 

 The levels of arsenic, cadmium and lead that are defined as the 

 concentration of contaminants which will produce characteristic EP 

 Toxicity are shown in Table 49. The state of California has also 

 taken a similiar approach to defining hazardous materials by using 

 two criteria; soluble threshold limit concentration (STLC) , and 

 total threshold limit concentraction (TTLC) . These criteria are 

 given in Table 50. 



5.4 Criteria for Metal Contaminants Based on Land Use 



The British Department of Environment has set draft guide- 

 lines for the concentration of contaminants in soils based on land 

 use. These criteria are given in Table 51. 



5.5 Summary 



Table 52 summarizes the hazard criteria for arsenic, cadmium, 

 lead and zinc concentrations. These data are a synthesis of 

 information from state, provincial and national regulatory 



agencies. Heavy emphasis is given to maximum cumulative loadings 

 of sludge to agricultural soils. 



TO 



