SPE Calculator

ESCI, LLC
Soil-Water Partitioning Slider Calculator

The complete Soil-Water Partitioning and
Dilution-Attenuation Factor Slider Calculator can be found at:
http://www.seview.com/calc/spedaf.htm |

Benzene

IGWSRS = Impact to Ground Water Soil Remediation Standard (µg/L, ppb)

IGWSRS

(µg/kg, ppb)

MCL or
Health Based New Jersey Ground Water Quality Criteria, C _gw (µg/L, ppb)

Minimum:

Value:

IGWSRS

(µg/kg, ppb)

Soil Organic Carbon-Water Partition Coefficient K _oc (L/kg)

Minimum:

Value:

IGWSRS

(µg/kg, ppb)

Soil Organic Carbon Content f _oc (kg/kg)

Minimum:

Value:

IGWSRS

(µg/kg, ppb)

Water-Filled Soil Porosity, θ _w (L water/L soil)

Minimum:

Value:

IGWSRS

(µg/kg, ppb)

Air-Filled Soil Porosity, θ _a (L air/L soil)

Minimum:

Value:

IGWSRS

(µg/kg, ppb)

Henry's Law Constant, H ′ (dimensionless)

Minimum:

Value:

IGWSRS

(µg/kg, ppb)

Dry Soil Bulk Density ρ _b (kg/L)

Minimum:

Value:

Soil-Water Partitioning Slider Calculator The ESCI, LLC soil-water partitioning slider calculator is based on the USEPA Soil Screening Level Guidance soil-water partitioning equation. It is used to establish a residual soil contaminant concentration that will not exceed a specific groundwater concentration.

Using the Slider Calculator
Just click on a contaminant to calculate the soil-water partitioning result using default New Jersey Department of Environmental Protection parameters. Cleanup objectives for other regulatory agencies or for site-specific conditions can be calculated by varying the input parameters.

More than just a simple calculator, the sliders can be adjusted to determine the sensitivity of the soil-water partitioning equation to specific parameters. This has many uses. For instance, it can be used to determine what soil organic carbon content would be required to produce a value above a detected concentration. A determination could then be made as to the likelihood of identifying soil organic carbon at such levels.

The slider calculator is very versatile. For instance to view results for a Koc of greater than 1000 (L/kg), simply enter the desired Koc as the maximum value. Then move the Koc slider to the maximum value. Or to evaluate the influence of Koc over a wider range, simply enter a new maximum value and move the slider.

The slider calculator can be used to determine the sensitivity of the soil-water partitioning equation. For instance the default value for benzene is 0.069 �g/kg. Yet even with a soil organic carbon content of 0.1 kg/kg (10 percent) the result is just 1.225 �g/kg.

Soil Leachate or Groundwater Concentration
Both the soil-water partitioning equation and SESOIL produce soil leachate concentrations. The resulting groundwater concentration would be lower due to dilution. At a minimum a dilution-attenuation factor (DAF) equation should be applied to produce a groundwater concentration. The slider calculator will be expanded in the next newsletter to include the USEPA DAF equation. For now you will need to multiply the results by the default DAF value of 13.