Iowa has adopted the ASTM RBCA method for addressing Petroleum Contaminated sites. See Action levels, Tier 1 table below. The action levels are used to determine when a Tier 1 investigation is required.

567--135.14(455B) Action levels. The following corrective action levels apply to petroleum regulated substances as regulated by this chapter. These action levels shall be used to determine if further corrective action under135.6(455B) through 135.12(455B) or 135.15(455B) is required as the result of tank closure sampling under 135.15(2) or other analytical results submitted to the department. The contaminant concentrations must be determined by laboratory analysis as stated in 135.16(455B). Final cleanup determination is not limited to these contaminants. The contamination corrective action levels are:
Iowa Action Levels for Soils and Groundwater

Product

Soils (mg/kg)

Groundwater (µg/L)

Benzene

0.54

5

Toluene

42

1,000

Ethylbenzene

15

700

Xylene

No limit

10,000

Total Extractable Hydrocarbons

3,800

1,200

Iowa Tier 1 Look-up Table

 Media

Exposure Pathway

Receptor

Group 1 Benzene

Group 1 Toluene

Group 1 Ethylbenzene

Group 1 Xylenes

Group 2 TEH Diesel*

Group 2 TEH Waste Oil

Groundwater (µg/L)



Groundwater Ingestion

actual

5

1,000

700

10,000

1,200

400

potential

290

7,300

3,700

73,000

75,000

40,000

Groundwater Vapor to Enclosed Space

all

1,540

20,190

46,000

NA

2,200,000

NA

Groundwater to Plastic Water Line

all

290

7,300

3,700

73,000

75,000

40,000

Surface Water

all

290

1,000

3,700

73,000

75,000

40,000

Soil (mg/kg)



Soil Leaching to Groundwater

all

0.54

42

15

NA

3,800

NA

Soil Vapor to Enclosed Space

all

1.16

48

79

NA

50,500

NA

Soil to Plastic Water Line

all

1.8

120

43

NA

10,500

NA

Note: NA= Not applicable. There are no limits for the chemical for the pathway, because for groundwater pathways the concentration for the designated risk would be greater than the solubility of the pure chemical in water, and for soil pathways the concentration for the designated risk would be greater than the soil concentration if pure chemical were present in the soil.

TEH: Total Extractable Hydrocarbons. The TEH value is based on risks from naphthalene, benzo(a)pyrene, benz(a)anthracene, and chrysene.

* Standards in the diesel column apply to all low volatile petroleum hydrocarbons except waste oil.

Refer to Appendix B (567-IAC 135) for further details.

Contact: Elaine Douskey, Iowa Department of Natural Resources, 515-281-8011

E-mail: elaine.douskey@dnr.state.ia.us

We site:  http://www.state.la.us/dnr/organiza/edp/ust/lqust.htm



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