Montana Cleanup
Standards for Hydrocarbon Contaminated Soil
TIER1 - SURFACE SOIL
(0-2ft) RBSLs (mg/kg)
(includes default RBSLs)
This table applies to
contaminant surface soil from 0-2 feet below ground surface. Default RBSLs
used to determine if a release ahs occurred at a site are provided in bold
and shaded. Default RBSLs apply to the entire soils column and always
apply in the absence of adequate information. Distance to water is from
the sample depth to the water table.
|
Distance
to Groundwater |
<10 feet to
Groundwater |
10-20 feet to
Groundwater |
>20 feet to
Groundwater |
|
Chemical |
E |
Residential |
B |
Commercial |
B |
Residential |
B |
Commercial |
B |
Residential |
B |
Commercial |
B |
|
For Gasoline and Light
Hydrocarbons measured using Massachusetts Method for
Volatile Petroleum Hydrocarbons (VPH) |
|
C5-C8 aliphatic |
n |
13 |
dc |
50 |
dc |
13 |
dc |
50 |
dc |
13 |
dc |
50 |
dc |
|
C9-C12 aliphatic |
n |
100 |
bu |
500 |
bu |
100 |
bu |
500 |
bu |
100 |
bu |
500 |
bu |
|
C9-C10 aromatic |
n |
15 |
l |
15 |
l |
32 |
dc |
50 |
l |
32 |
dc |
70 |
l |
|
MTBE |
n |
0.1 |
l |
0.1 |
l |
0.2 |
l |
0.2 |
l |
0.3 |
l |
0.3 |
l |
|
Benzene |
c |
0.05 |
l |
0.05 |
l |
0.1 |
l |
0.1 |
l |
0.2 |
l |
0.2 |
l |
|
Toluene |
n |
14 |
l |
14 |
l |
41 |
l |
41 |
l |
63 |
l |
63 |
l |
|
Ethylbenzene |
n |
13 |
l |
13 |
l |
40 |
l |
40 |
l |
62 |
l |
62 |
l |
|
Xylenes |
n |
220 |
l |
220 |
l |
680 |
l |
680 |
l |
1000 |
l |
1000 |
l
|
|
Naphthalene |
n |
9 |
l |
9 |
l |
30 |
l |
30 |
l |
47 |
l |
47 |
l |
|
For Diesel and Heavy
Hydrocarbons measured using Massachusetts Method for
Extractable Petroleum Hydrocarbons (EPH) |
|
C9-C18 aliphatic |
n |
1000 |
bu |
2500 |
bu |
1000 |
bu |
2500 |
bu |
1000 |
bu |
2500 |
bu |
|
C19-C36 aliphatic |
n |
2500 |
bu |
5000 |
bu |
2500 |
bu |
5000 |
bu |
2500 |
bu |
5000 |
bu |
|
C11-C22 aromatic |
n |
120 |
dc |
400 |
dc |
120 |
dc |
750 |
dc |
120 |
dc |
750 |
dc |
|
Acenaphthene |
n |
160 |
l |
160 |
l |
530 |
l |
530 |
l |
590 |
dc |
810 |
l |
|
Anthracene |
n |
2900 |
dc |
3700 |
l |
2900 |
dc |
13000 |
l |
2900 |
dc |
19000 |
l |
|
Benz(a)anthracene |
c |
0.8 |
dc |
6 |
dc |
0.8 |
dc |
6 |
dc |
0.8 |
dc |
6 |
dc |
|
Benzo(a)pyrene |
c |
0.08 |
dc |
0.6 |
dc |
0.08 |
dc |
0.6 |
dc |
0.08 |
dc |
0.6 |
dc |
|
Benzo(b)fluoranthene |
c |
0.8 |
dc |
6 |
dc |
0.8 |
dc |
6 |
dc |
0.8 |
dc |
6 |
dc |
|
Benzo(k)fluoranthene |
c |
8 |
dc |
60 |
dc |
8 |
dc |
60 |
dc |
8 |
dc |
60 |
dc |
|
Chrysene |
c |
80 |
dc |
630 |
dc |
80 |
dc |
630 |
dc |
80 |
dc |
630 |
dc |
|
Dibenzo(a)anthracene |
c |
0.08 |
dc |
0.6 |
dc |
0.08 |
dc |
0.6 |
dc |
0.08 |
dc |
0.6 |
dc |
|
Fluoranthene |
n |
390 |
dc |
1000 |
l |
390 |
dc |
3500 |
l |
390 |
dc |
5400 |
l |
|
Fluorene |
n |
160 |
l |
160 |
l |
390 |
dc |
550 |
l |
390 |
dc |
850 |
l |
|
Indeno(1,2,3-cd)pyrene |
c |
0.8 |
dc |
6 |
dc |
0.8 |
dc |
6 |
dc |
0.8 |
dc |
6 |
dc |
|
Naphthalene |
n |
9 |
l |
9 |
l |
30 |
l |
30 |
l |
47 |
l |
47 |
l |
|
Pyrene |
n |
290 |
l |
4,950 |
dc |
290 |
dc |
6,170 |
dc |
290 |
dc |
6,170 |
dc |
Notes:
E=Effect is either:
n=noncarcinogenic and direct contact RBSLs are based on hazard quotient of
0.125 for a total hazard index which does not exceed 1 or
c=carcinogenic and direct contact RBSLs are based on a cancer risk of 1x10-6
for a total cancer risk which does not exceed 1x10-5.
B=Basis is the most
conservative of: l=leaching from soil to groundwater;
dc=residential direct contact including ingestion, inhalation and dermal;
or
bu=adversely affects beneficial uses (foul odor or taste).
If the leaching pathway
is not the most conservative basis, residential or commercial RSBLs apply
to surface soils.
DEQs RBCA policy
includes a ceiling concentration of 100mg/kg for the total of the gasoline
range fractions and 2500mg/kg for the total of the diesel range fractions
in residential soil.
DEQs RBCA policy
includes a ceiling concentration of 500mg/kg for the total of the gasoline
range fractions and 5000mg/kg for the total of the diesel range fractions
in commercial soil.
TIER1 - SUBSURFACE
SOIL (>2ft) RBSLs (mg/kg)
This table applies to
contaminated subsurface soil (>2ft below the ground surface). Distance to
water is from the sample depth to the water table.
|
Distance
to Groundwater |
<10 feet to
Groundwater |
10-20 feet to
Groundwater |
>20 feet to
Groundwater |
|
Chemical |
E |
>2ft Excavation |
B |
>2ft Excavation |
B |
>2ft Excavation |
B |
|
For Gasoline and Light
Hydrocarbons measured using Massachusetts Method for
Volatile Petroleum Hydrocarbons (VPH) |
|
C5-C8 aliphatic |
n |
100 |
dc |
100 |
dc |
100 |
dc |
|
C9-C12 aliphatic |
n |
500 |
bu |
500 |
bu |
500 |
bu |
|
C9-C10 aromatic |
n |
15 |
l |
50 |
l |
70 |
l |
|
MTBE |
n |
0.1 |
l |
0.2 |
l |
0.3 |
l |
|
Benzene |
c |
0.05 |
l |
0.1 |
l |
0.2 |
l |
|
Toluene |
n |
14 |
l |
41 |
l |
63 |
l |
|
Ethylbenzene |
n |
13 |
l |
40 |
l |
62 |
l |
|
Xylenes |
n |
220 |
l |
680 |
l |
1000 |
l
|
|
Naphthalene |
n |
9 |
l |
30 |
l |
47 |
l |
|
For Diesel and Heavy
Hydrocarbons measured using Massachusetts Method for
Extractable Petroleum Hydrocarbons (EPH) |
|
C9-C18 aliphatic |
n |
5000 |
bu |
5000 |
bu |
5000 |
bu |
|
C19-C36 aliphatic |
n |
5000 |
bu |
5000 |
bu |
5000 |
bu |
|
C11-C22 aromatic |
n |
400 |
dc |
1300 |
dc |
1400 |
dc |
|
Acenaphthene |
n |
160 |
l |
530 |
l |
810 |
l |
|
Anthracene |
n |
3700 |
l |
13000 |
l |
19000 |
l |
|
Benz(a)anthracene |
c |
13 |
dc |
40 |
dc |
68 |
dc |
|
Benzo(a)pyrene |
c |
3 |
dc |
12 |
dc |
18 |
dc |
|
Benzo(b)fluoranthene |
c |
45 |
dc |
150 |
dc |
180 |
dc |
|
Benzo(k)fluoranthene |
c |
450 |
dc |
1500 |
dc |
1800 |
dc |
|
Chrysene |
c |
1400 |
dc |
4900 |
dc |
7500 |
dc |
|
Dibenzo(a)anthracene |
c |
6 |
dc |
18 |
dc |
18 |
dc |
|
Fluoranthene |
n |
1000 |
l |
3500 |
l |
5400 |
l |
|
Fluorene |
n |
160 |
l |
550 |
l |
850 |
| 