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Montana Cleanup Standards
for Hydrocarbon Contaminated Groundwater
TIER 1 - Groundwater RSBLs and Standards Table
This table applies to groundwater and consists of WQB-7 Human Health
Standards (HHSs), where available. For compounds without WQB-7 HHSs, DEQ
has developed RBSLs and included them in the table. Surface water impacts
require a minimum of Tier 2 evaluation.
|
Chemical
|
Effect
|
Basis
|
Groundwater
Standard or RBSL (mg/L)
|
|
For
Gasoline and Light Hydrocarbons measured using the Massachusetts
Method for Volatile Petroleum Hydrocarbons (VPH)
|
|
C5-C8
aliphatic
|
n
|
rb
|
350
|
|
C9-C12
aliphatic
|
n
|
bu
|
1000
|
|
C9-C10
aromatic
|
n
|
rb
|
100
|
|
MTBE
|
n
|
hhs
|
30
|
|
Benzene
|
c
|
hhs
|
5
|
|
Toluene
|
n
|
hhs
|
1000
|
|
Ethylbenzene
|
n
|
hhs
|
700
|
|
Xylenes
|
n
|
hhs
|
10000
|
|
Naphthalene
|
n
|
hhs
|
28
|
|
For
Diesel and Heavy Hydrocarbons measured using the Massachusetts Method
for Extractable Petroleum Hydrocarbons (EPH)
|
|
C9-C18
aliphatic
|
n
|
bu
|
1000
|
|
C19-C36
aliphatic
|
n
|
bu
|
1000
|
|
C11-C22
aromatic
|
n
|
rb
|
1000
|
|
Total
Extractable Hydrocarbons
|
n
|
rb
|
1000
|
|
Acenaphthene
|
n
|
hhs
|
420
|
|
Anthracene
|
n
|
hhs
|
2100
|
|
Benz(a)anthracene
|
c
|
hhs
|
0.48
|
|
Benzo(a)pyrene
|
c
|
hhs
|
0.048
|
|
Benzo(b)fluoranthene
|
c
|
hhs
|
0.48
|
|
Benzo(k)fluoranthene
|
c
|
hhs
|
4.79
|
|
Chrysene
|
c
|
hhs
|
48
|
|
Dibenzo(a)anthracene
|
c
|
hhs
|
0.048
|
|
Fluoranthene
|
n
|
hhs
|
280
|
|
Fluorene
|
n
|
hhs
|
280
|
|
Indeno(1,2,3-cd)pyrene
|
c
|
hhs
|
0.48
|
|
Naphthalene
|
n
|
hhs
|
28
|
|
Pyrene
|
n
|
hhs
|
210
|
Notes:
E=Effect is either:
n=noncarcinogenic and direct contact RBSLs are based on hazard
quotient of 1 or
c=carcinogenic and direct contact RBSLs are based on a cancer risk of 1x10-5
.
B=Basis is the most conservative of:
rb=risk-based screening level;
hhs=WQB-7 Human Health Standard
bu=adversely affects beneficial uses (foul odor or taste).
Contact:
Scott Gestring, Montana Department of Environmental
Quality, 406-444-1388
Web
Site: http://www.state.mt.us
E-mail: sgestring@state.mt.us
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