Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:20:p3
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 20 (pt 3/4)
Character Range: 1647977–1650810

20  30   65   90

Table 52. Soil-specific added contaminant limits (ACLs, mg/kg) based on no observed effect concentration (NOEC) and 10% effect concentration (EC10) toxicity data for fresh copper (Cu) contamination that theoretically protect at least 80% of soil processes, soil invertebrate species and plant species in soils with a pH ranging from 4.5 to 8 and a cation exchange capacity (CEC) ranging from 5 to 60 cmolc/kg and an urban residential/public open space land use. The lower of the CEC- or the pH-derived ACLs that apply to a soil is the ACL(NOEC & EC10) to be used.
Type of ACL     CEC (cmolc/kg)
                5               10   20  30   40   60
CEC-based ACLs  30              60   65  65   70   70
                pH
                4.5             5.5  6   6.5  7.5  8.0
pH-based ACLs   20              40   60  85   170  250

Table 53. Soil-specific added contaminant limits (ACLs, mg/kg) based on no observed effect concentration (NOEC) and 10% effect concentration (EC10) toxicity data for fresh copper (Cu) contamination that theoretically protect at least 60% of soil processes, soil invertebrate species and plant species in soils with a pH ranging from 4.5 to 8 and a cation exchange capacity (CEC) ranging from 5 to 60 cmolc/kg and a commercial/industrial land use. The lower of the CEC- or the pH-derived ACLs that apply to a soil is the ACL(NOEC & EC10) to be used.
Type of ACL     CEC (cmolc/kg)
                5               10   20   30   40   60
CEC-based ACLs  45              90   100  100  110  110
                pH
                4.5             5.5  6    6.5  7.5  8.0
pH-based ACLs   30              60   90   130  270  380

7.6.1.2         Calculation of ambient background concentration values
To convert ACL(NOEC & EC10) values to SQG(NOEC & EC10) values, the ambient background concentration (ABC) needs to be added to the ACL(NOEC & EC10). Three methods of determining the ABC were recommended in the methodology for deriving SQGs (Heemsbergen et al. 2008).
The preferred method is to measure the ABC at an appropriate reference site. However, where this is not possible, the methods of Olszowy et al. (1995) and Hamon et al. (2004) were recommended to predict the ABC where there has been and has not been, respectively, a history of contamination. In the Hamon et al. (2004) method, the ABC for a variety of metal contaminants, including Cu, vary with either the soil iron or manganese content. The equation to predict the ABC for Cu in soils with no history of Cu contamination (Hamon et al. 2004) is:
log Cu conc (mg/kg) = 0.612 log Fe content (%) + 0.808    (equation 7)

Examples of the ABC values predicted by this equation are presented in Table 54.
Table 54. Ambient background concentrations (ABCs) for copper (Cu) predicted using the Hamon et al. (2004) method.
Fe