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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