Section 742.215 Determination of Soil Attenuation Capacity

Section

742.215  Determination of Soil Attenuation Capacity

a)         The concentrations of

organic contaminants of concern remaining in the soil shall not exceed the

attenuation capacity of the soil, as determined under subsection (b) of this

Section.

b)         The

soil attenuation capacity is not exceeded if:

1)         The sum of the organic

contaminant residual concentrations analyzed for the purposes of the

remediation program for which the analysis is performed, at each discrete

sampling point, is less than the natural organic carbon fraction of the soil.

If the information relative to the concentration of other organic contaminants

is available, such information shall be included in the sum.  The natural

organic carbon fraction (foc) shall be either:

A)        A default value of 6000

mg/kg for soils within the top meter and 2000 mg/kg for soils below one meter

of the surface; or

B)        A site-specific value as

measured by the analytical method referenced in Appendix C, Table F, multiplied

by 0.58 to estimate the fraction of organic carbon, as stated in, Nelson and

Sommers (1982) or by SW-846 Method 9060: Total Organic Carbon, as incorporated

by reference in Section 742.210;

2)         The total petroleum

hydrocarbon concentration is less than the natural organic carbon fraction of the

soil as demonstrated using a method approved by the Agency.  The method

selected shall be appropriate for the contaminants of concern to be addressed;

or

3)         Another method, approved

by the Agency, shows that the soil attenuation capacity is not exceeded.