Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:60:p1
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 60 (pt 1/3)
Character Range: 1528127–1530904

60                                   420

Table 9. Soil-specific ACL values for zinc (Zn) based on no observed effect concentration and 10% effect concentration toxicity data that should theoretically protect 80% of plant species in soils with pH values ranging from 4.0 to 7.5 and CEC values ranging from 5 to 60 cmolc/kg.
pH   CEC (cmolc/kg)
     5               10   20   30   40   60
4.0  20              30   50   65   75   100
4.5  25              40   65   85   110  140
5.0  35              55   90   120  140  190
5.5  45              75   120  160  200  260
6.0  65              100  170  220  270  360
6.5  85              140  230  300  370  490
7.0  120             190  310  410  500  670
7.5  160             260  420  560  690  910

These soil-specific ACL(NOEC & EC10) values for each organism group (presented in Tables 7 to 9) were then merged into a single set of soil-specific ACL(NOEC & EC10) values—so that the lowest ACL(NOEC & EC10) value for each combination of soil pH and CEC was adopted (Table 10). The ACL(NOEC & EC10) values presented in Table 10 should protect at least 80% of soil processes, soil invertebrate and plant species and these ranged from 20 to 330 mg/kg in soils with pH values between 4 and 7.5 and CEC values between 5 and 60 cmolc/kg. The ACL(NOEC & EC10) values presented in Tables 79 are the ACLs for individual groups of organisms and should not be used as ACL(NOEC & EC10) values.

Table 10. Soil-specific added contaminant limits based on no observed effect concentration and 10% effect concentration toxicity data (ACL(NOEC & EC10), mg/kg) for zinc (Zn) that theoretically protect at least 80% of soil processes, soil invertebrate species and plant species in soils with a pH ranging from 4.0 to 7.5 and CEC values ranging from 5 to 60 cmolc/kg. These values may be used as ACLs(NOEC & EC10)  for Zn in freshly contaminated soils with an urban residential /public open space land use.
pH   CEC (cmolc/kg)
     5               10   20   30   40   60
4.0  20              20   20   20   20   20
4.5  25              30   30   30   30   30
5.0  35              45   45   45   45   45
5.5  45              70   70   70   70   70
6.0  60              100  100  100  100  100
6.5  60              100  150  150  150  150
7.0  60              100  180  220  220  220
7.5  60              100  180  240  300  330

The same methods as described above were used to generate the ACL (NOEC & EC10) values for areas of ecological significance and commercial/industrial land uses. The ACL (NOEC & EC10) values for these land uses are presented in Tables 11 and 12.
Table 11. Soil-specific added contaminant limits based on no observed effect concentration and 10% effect concentration toxicity data (ACL(NOEC & EC10), mg/kg) for zinc