Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:1:p3
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 1 (pt 3/4)
Character Range: 1767053–1770178

to urban residential land/public open space land use based on NOEC and EC10, LOEC and EC30, and EC50 data ranged from 3575, 75160 and 100230 mg added Cr (III)/kg respectively. The SQGs based on NOEC and EC10 data are closest to the existing international SQGs for Cr (III). It should be noted that all of the  ACLs for urban residential land/public open space land use (irrespective of what data was used to generate them) are considerably smaller than the superseded interim urban EIL of 400 mg total Cr/kg (NEPC 1999). However, the ACLs are consistent with the available Cr (III) toxicity data where there are 6 species/microbial processes that have EC50 values below the superseded interim urban EIL and there are 12 and 16 species/microbial processes that have LOEC and EC30 or NOEC and EC10 data respectively, below the superseded interim urban EIL. The species/microbial processes with toxicity values below the superseded interim urban EIL can be indentified by referring to Table 83.

The  ACLs for aged Cr (III) contamination that apply to urban residential land/public open space land use based on NOEC and EC10, LOEC and EC30, and EC50 data ranged from 85190, 175400 and 270580 mg added Cr (III)/kg respectively. None of the ACLs based on NOEC & EC10 and LOEC & EC30 toxicity data were larger than the current interim EIL. However, once the clay content was 5% or above, the ACL values based on EC50 data were larger than the superseded interim EIL. All of the ACLs for aged Cr (III) contamination are considerably larger than the collated international Cr (III) SQGs.

Table 89. Soil quality guidelines (mg/kg) for total chromium, trivalent chromium (Cr (III)) and hexavalent chromium (Cr (VI)) from international jurisdictions.

Name of chromium soil quality guideline    Total chromium            Trivalent chromium  Hexavalent chromium
Canadian SQG (residential)1                                                              0.4 (total)
Canadian SQG (commercial and industrial)1                                                1.4 (total)
Danish soil quality guideline2                                       50 (total)          2 (total)
Dutch target value3                        100 (added Cr)
Dutch maximum permissible addition3        380 (added Cr)
Eco-SSL plants4                                                      ID                  ID
Eco-SSL soil invertebrates4                                          ID                  ID
Eco-SSL avian4                                                       26 (total)          ID
Eco-SSL mammalian4                                                   34 (total)          130 (total)
EU minimal risk values (residential)5      34130 (added & total)                        2.5 (added & total)
EU warning risk values (residential)5      50450 (added & total)                        4.220 (added & total)
EU potential risk values (residential)5    1001000 (added & total)

1 = CCME 1999h and 2006 and http://ceqg-rcqe.ccme.ca/
2 = Scott-Fordsmand and Pedersen 1995
3 = VROM 2000
4 =  http://www.epa.gov/ecotox/ecossl/
5 = Carlon 2007
ID = insufficient data.