Ohio Administrative Code
Title 3745 - Ohio Environmental Protection Agency
Chapter 3745-300 - Voluntary Action Program
Section 3745-300-08 - Generic numerical standards
Universal Citation: OH Admin Code 3745-300-08
Current through all regulations passed and filed through September 16, 2024
[Comment: For dates of non-regulatory government publications, publications of recognized organizations and associations, federal rules, and federal statutory provisions referenced in this rule, see rule 3745-300-15 of the Administrative Code titled "Incorporation by reference - voluntary action program."]
(A) Generic numerical standards.
(1)
Applicability.
(a)
Generic numerical standards listed in this rule for
hazardous substances and petroleum may be used to demonstrate compliance with
applicable standards provided the exposure scenario for the property comports
with land use and activity patterns used to derive the generic numerical
standard. Generic numerical standards are provided for complete exposure
pathways to petroleum releases [paragraph (B) of this rule], direct contact
with hazardous substances in soil [paragraph (C) of this rule], indoor air
exposure due to vapor intrusion from environmental media to human receptors
[paragraph (D) of this rule], unrestricted potable use for hazardous substances
in ground water [paragraph (E) of this rule], and complete exposure pathways to
human and ecological receptors from surface water and sediment [paragraphs (G),
(H), and (I) of this rule]. The appendices to this rule provide the generic
numerical standards.
(b)
If complete exposure pathways exist on a property that
are not considered in the development of a generic numerical standard listed in
this rule, or if a generic numerical standard is not listed for chemicals of
concern (COCs) on a property, applicable standards shall be derived in
accordance with rule
3745-300-09
of the Administrative Code. Demonstration of compliance with applicable
standards at a property may be made with a combination of generic numerical
standards in accordance with this rule and standards developed through a
property-specific risk assessment in accordance with rule
3745-300-09
of the Administrative Code or any other applicable standards.
(c)
If radioactive
materials are identified at a property, the property may be subject to the
Atomic Energy Act and regulations adopted thereunder and Chapters 3701. and
3747. of the Revised Code and rules adopted thereunder. If radionuclides or
radioactive materials are present at a property, the volunteer shall contact
the Ohio department of health's bureau of environmental health and radiation
protection regarding the cleanup of the radionuclides or radioactive material.
Remedy approval by the Ohio department of health shall be considered sufficient
to meet applicable standards for radionuclides or radioactive materials for the
voluntary action and may be considered a generic numerical
standard.
(2)
Assumptions. The following assumptions apply for all
generic numerical standards except for the generic direct contact soil
standards for petroleum described in paragraph (B) of this rule, direct contact
soil standards for lead described in paragraph (C)(3)(e) of this rule, the
generic unrestricted potable use standards based on maximum contaminant levels
or other regulatory established criteria described in paragraph (E) of this
rule, and potable use standards for petroleum described in paragraph (E)(3) of
this rule:
(a)
Single chemical. The generic numerical standards assume a single COC is present
within an identified area.
(i)
The single chemical generic standards in this rule are
based on the following risk and hazard levels:
(a)
For hazardous
substances that have carcinogenic effects, the chemical-specific carcinogenic
risk shall not exceed one excess cancer in a population of one hundred thousand
(1 x 10-5).
(b)
For hazardous
substances that have non-carcinogenic effects, the chemical-specific risk shall
not exceed a hazard index of one.
(ii)
As determined in
accordance with paragraph (F)(6) of rule
3745-300-07
of the Administrative Code, the concentration of a COC shall not exceed the
single chemical generic standard for that chemical.
(b)
Cumulative
adjustment for multiple chemicals.
(i)
When more than one COC is present in each media within
an identified area and an applicable generic standard for each of the COCs is
in this rule, the standard for each COC shall be adjusted for the presence of
multiple chemicals to meet the risk and hazard levels described in paragraph
(A)(2)(a) of this rule.
(ii)
A cumulative adjustment for multiple chemicals within
each media shall be made when using a combination of generic standards and
applicable standards determined by a property-specific risk assessment in
accordance with rule
3745-300-09
of the Administrative Code.
(iii)
In accordance
with paragraph (A)(2)(c) of this rule, the incremental risk and hazard shall be
added to the incremental risk and hazard from other complete exposure pathways
to the same receptor population.
(iv)
All final
cumulative human health carcinogenic risk and non-carcinogenic hazard levels
are based on one significant figure.
(c)
Summation of risk
and hazard across complete exposure pathways.
(i)
If more than one
complete exposure pathway exists to each receptor population, the incremental
cancer risk and hazard indices determined for each exposure pathway shall be
summed to calculate a cumulative cancer risk and hazard index to each receptor
population.
(ii)
All final cumulative human health carcinogenic risk and
non-carcinogenic hazard levels are based on one significant
figure.
(d)
If the generic numerical standards of this rule are
applied to one or more identified areas of the property and applicable
standards, as determined in accordance with rule
3745-300-09
of the Administrative Code, are applied to one or more exposure units or other
areas of the property, then the volunteer shall ensure that the risk and hazard
levels for each receptor on the property do not exceed the following:
(i)
One excess cancer
in a population of one hundred thousand (1 x 10-5).
(ii)
A hazard index
of one.
(iii)
All final cumulative human health carcinogenic risk and
non-carcinogenic hazard levels are based on one significant
figure.
(e)
Points of compliance. In accordance with paragraph (I)
of rule
3745-300-07
of the Administrative Code, the volunteer shall comply with the applicable
standards at all points of compliance at the property, for each environmental
media and complete exposure pathway.
(3)
A
property-specific risk assessment shall be conducted in accordance with rule
3745-300-09
of the Administrative Code to determine applicable standards instead of, or in
addition to, using the generic numerical standards from this rule, if any of
the following apply to the property:
(a)
The complete
exposure pathways as identified in accordance with paragraph(F)(1) of rule
3745-300-07
of the Administrative Code, include exposure pathways that are not considered
in the development of standards listed in this rule.
(b)
The exposure
factors for the receptors identified in paragraph (E)(6) of rule 3745-300-07 of
the Administrative Code are not considered in the development of standards
listed in this rule, or the volunteer evaluates compliance with applicable
standards for exposure units instead of identified areas in accordance with
rule
3745-300-09
of the Administrative Code.
(c)
The COCs on the
property consist of hazardous substances or petroleum that do not have generic
numerical standards listed in this rule.
(i)
If only some of
the COCs identified have a generic numerical standard listed in this rule, a
volunteer may use the applicable generic numerical standards for the COCs that
have listed standards and conduct a property-specific risk assessment in
accordance with rule
3745-300-09
of the Administrative Code.
(ii)
If a combination
of generic numerical standards and applicable standards determined by a
property-specific risk assessment conducted in accordance with rule
3745-300-09
of the Administrative Code is used, the volunteer shall adjust the
concentrations of the applicable standards to meet the human health risk and
hazard levels described in paragraph (A)(2)(d) of this rule.
(d)
Concentrations of COCs in surface water or sediment exceed applicable standards
determined in accordance with this rule.
(e)
Complete exposure
pathways to important ecological resources other than sediment or surface water
exist.
(B) Generic numerical standards for petroleum.
(1)
Applicability.
(a)
The generic
numerical standards referenced in paragraph (B)(3) of this rule apply to all
petroleum releases regardless of the source or how the petroleum was released.
After eligibility requirements in accordance with rule
3745-300-02
of the Administrative Code are met, applicable standards for all petroleum
releases on the property shall be achieved in accordance with this
chapter.
(b)
The generic numerical standards referenced in paragraph
(B)(3) of this rule apply to the exposure pathways for which rules adopted
under division (B) of section
3737.882 of the Revised Code
have numerical clean-up standards. If an exposure pathway is not addressed by a
generic numerical standard under division (B) of section
3737.882 of the Revised Code,
then the exposure pathway shall be evaluated in accordance with rule
3745-300-09
of the Administrative Code.
(2)
Assumptions.
(a)
The points of compliance for generic petroleum
standards are identified in paragraph (I) of rule
3745-300-07
of the Administrative Code. For example, exposure pathways that are encompassed
within the generic direct-contact soil standard shall use the points of
compliance indicated in paragraph (I)(1)(a)(i) of rule
3745-300-07
of the Administrative Code. In accordance with paragraph (I) of rule
3745-300-07
of the Administrative Code, the volunteer shall comply with the applicable
standards at all points of compliance at the property for each environmental
medium and complete exposure pathway.
(b)
Cumulative
adjustment for multiple chemicals and summation of risk across complete
exposure pathways that are required for COCs on the property to comply with
paragraphs (A)(2) and (F) of this rule may not necessarily apply for generic
petroleum standards referenced in paragraph (B)(3) of this rule. Cumulative
adjustment for multiple chemicals and summation of risk across complete
exposure pathways to meet generic petroleum standards are required only when
required by rules adopted under division (B) of section
3737.882 of the Revised
Code.
(c)
When ground water exceeds unrestricted potable use
standards, ground water response requirements in accordance with rule
3745-300-10
of the Administrative Code shall be met. Properties with free product exceed
applicable standards for unrestricted potable use of ground
water.
(d)
Restricted residential, commercial with high frequency
child exposure, commercial, and industrial land use categories [as determined
in accordance with paragraph (C)(2) of this rule] require implementation of
institutional controls in accordance with paragraph (C)(2) of rule
3745-300-11 of the
Administrative Code.
(3)
Generic numerical
standards for petroleum. The generic numerical standards for petroleum at
residential, commercial, or industrial properties are the standards established
in rules adopted under division (B) of section
3737.882 of the Revised Code, as
provided in division (B)(1) of section
3746.04 of the Revised Code. The
state fire marshal's bureau of underground storage tank regulations administers
the rules adopted under division (B) of section
3737.882 of the Revised Code.
Property-specific standards for petroleum may be developed in accordance with
rule
3745-300-09
of the Administrative Code.
(C) Generic numerical standards for hazardous substances; direct-contact with soils and vapor intrusion to indoor air.
(1)
Applicability.
(a)
When generic
direct-contact soil standards are applied, a volunteer shall select the land
use or activity category which is consistent with the land use definitions in
rule
3745-300-01
of the Administrative Code. The land use or activity category shall be
determined based on the property use, receptor populations, and pathways
identified in accordance with paragraphs (E)(6) and (F)(1) of rule
3745-300-07
of the Administrative Code. The exposure factors used in the development of
generic numerical standards are in Ohio EPA's "Support Document For the
Development of Generic Numerical Standards and Risk Assessment Procedures."
Generic direct-contact soil standards for commercial and industrial land uses
are equal unless paragraph (C)(2)(b) of this rule or paragraph (B)(1)(b) of
rule
3745-300-09
of the Administrative Code applies.
(b)
A
property-specific risk assessment shall be conducted in accordance with rule
3745-300-09
of the Administrative Code, to determine applicable standards instead of, or in
addition to, the generic direct-contact soil standards, if any conditions of
paragraph (A)(3) of this rule apply.
(c)
Generic numerical
standards for petroleum releases are identified in paragraph (B)(3) of this
rule. The standards identified in paragraphs (C) (3) and (D) of this rule and
provided in appendix A to this rule apply to releases of hazardous
substances.
(2)
Land use and activity categories. The generic
direct-contact soil standards and vapor intrusion to indoor standards
established in this rule are based upon the intended use of the property after
the completion of a voluntary action. Standards applied to restricted
residential, commercial with high frequency child exposure, commercial, and
industrial land use categories require implementation of institutional controls
in accordance with rule
3745-300-11 of the
Administrative Code. Land use and activity categories shall be determined as
follows, as the terms are defined in rule
3745-300-01
of the Administrative Code:
(a)
Residential land use category.
(i)
Unrestricted
residential land use category.
(ii)Restricted
residential land use category.
(b)
Commercial land
use with high frequency child exposure category.
(c)
Commercial or
industrial land use category.
(d)
Construction
activities.
(3)
Generic numerical direct-contact soil standards.
(a)
The generic
direct-contact soil standards for carcinogenic and non-carcinogenic COCs are
derived considering exposures that include ingestion of soil, dermal contact
with soil, inhalation of volatile compounds in outdoor air, and the inhalation
and ingestion of particulate emissions. All applicable exposures not considered
within the generic direct-contact soil standards shall be addressed in
accordance with rule
3745-300-09
of the Administrative Code.
(i)
The generic direct-contact soil standards for
carcinogenic and non-carcinogenic COCs for residential land use categories are
in table I of appendix A to this rule.
(ii)
The generic
direct-contact soil standards for carcinogenic and non-carcinogenic COCs for
commercial land use with high frequency child exposure are in table II of
appendix A to this rule.
(iii)
The generic
direct-contact soil standards for carcinogenic and non-carcinogenic COCs for
commercial and industrial land use categories are in table III of appendix A to
this rule.
(iv)
The generic direct-contact soil standards for
carcinogenic and non-carcinogenic COCs for the construction activities category
are in table IV of appendix A to this rule.
(v)
The lead
standards in tables I, II, III, and IV of appendix A to this rule account for
other factors and assumptions in addition to the carcinogenic or
non-carcinogenic risk of lead. Therefore, the cumulative risk considerations in
paragraph (A)(2) of this rule are not appropriate and need not be performed for
lead.
(b)
The soil saturation concentrations are calculated using
the U.S. EPA recommended soil saturation equation in paragraph (H)(5) of rule
3745-300-09
of the Administrative Code. This equation is not recommended for compounds that
are at solid phase at ambient soil temperatures. Therefore, no generic soil
saturation values are calculated for those chemicals for which the melting
point is greater than seventeen degrees Celsius. Further, soil saturation
values are determined only for those chemicals for which physicochemical
parameters used to derive the soil saturation concentrations could be verified.
The volunteer may either use the soil saturation levels as listed in appendix A
to this rule, or may calculate a property-specific soil saturation
concentration in place of the generic soil saturation in accordance with
paragraph (H)(5) of
3745-300-09
of the Administrative Code.
(4)
Generic numerical
standards for indoor air due to vapor intrusion from environmental media are
derived considering the exposure scenario and the chemical specific inhalation
toxicity. Standards apply to indoor air only for chemicals that have
volatilized from environmental media to indoor air. Concentrations of COCs in
ground water or soil gas may be used to approximate indoor air concentrations
through modeling conducted in accordance with rule
3745-300-07
of the Administrative Code.
(a)
The standards for indoor air exposure due to vapor
intrusion from environmental media for the residential land use category are in
table V of appendix A to this rule.
(b)
The standards for
indoor air exposure due to vapor intrusion from environmental media for the
commercial land use with high frequency child exposure category are in table VI
of appendix A to this rule.
(c)
The standards for
indoor air exposure due to vapor intrusion from environmental media for the
commercial or industrial land use categories are in table VII of appendix A to
this rule.
(D) Generic unrestricted potable use standards for hazardous substances in ground water.
(1)
Applicability.
(a)
The generic unrestricted potable use standards in
paragraph (E)(3) of this rule apply as determined in accordance with rule
3745-300-10
of the Administrative Code.
(b)
A
property-specific risk assessment shall be conducted in accordance with rule
3745-300-09
of the Administrative Code to determine applicable standards in place of, or in
addition to, using the generic unrestricted potable use standards if any of
paragraphs (A)(3)(a) to (A)(3)(c) of this rule apply to the property, and those
exposures are required to be evaluated under rule
3745-300-07
of the Administrative Code.
(c)
The standards in
paragraph (E)(3) of this rule apply to releases of hazardous substances.
Generic numerical standards for petroleum releases are identified in paragraph
(B)(3) of this rule.
(2)
Assumptions. The
generic unrestricted potable use standards in tables VIII and IX of appendix A
to this rule are determined using the assumption that the ground water on or
from the property shall be used as a source of water for drinking, cooking,
showering, and bathing.
(3)
Generic unrestricted potable use standards for ground
water.
(a)
The
generic unrestricted potable use standards for petroleum at commercial,
industrial, and residential properties are the standards established in rules
adopted under division (B) of section
3737.882 of the Revised Code, as
provided by division (B)(1) of section
3746.04 of the Revised
Code.
(b)
The generic unrestricted potable use standards based on
maximum contaminant levels or other regulatory established criteria are in
table VIII of appendix A to this rule. COCs in table VIII of appendix A to this
rule need not be included in the cumulative adjustment for multiple
chemicals.
(c)
The generic risk-derived unrestricted potable use
standards are in table IX of appendix A to this rule. COCs in table IX of
appendix A to this rule shall be included in the cumulative adjustment for
multiple chemicals.
(E) Procedures for cumulative adjustment for multiple chemicals. The following procedures may be used to meet the risk and hazard levels described in paragraph (A)(2)(d) of this rule when more than one COC is present in environmental media within an identified area:
(1)
Several procedures may be used to adjust for the
presence of multiple carcinogenic COCs in an identified area to comply with
paragraph (A)(2)(b) of this rule. One method is to divide the exposure point
concentration (chema) for
each COC in the affected media by the "Single Chemical Carcinogenic Standard"
(SCCSa) in appendix A to
this rule. The resultant ratios are summed as an expression of estimated risk
(see equation 1). When the summed ratios result in a value less than or equal
to one, at one significant figure in accordance with paragraph (A)(2)(b)(iv) of
this rule, carcinogenic risk levels are met on the property for exposure to
that media. When the summed ratios result in a value greater than one the
carcinogenic risk levels are not met and remedial action is required.
Equation 1 - cumulative cancer risk ratio for affected media
[(chema/SCCSa) + (chemb/SCCSb) + ...] = cumulative cancer risk ratio
(2)
Several procedures may be used to adjust for the
presence of multiple non-carcinogenic COCs in an identified area to comply with
paragraph (A)(2)(b) of this rule. One method is to divide the exposure point
concentration (chema) for
each COC in the affected media by the ''Single Chemical Noncarcinogenic
Standard'' (SCNSa) in
appendix A to this rule. The resultant ratios are summed as an expression of
estimated hazard index (see equation 2). When the summed ratios result in a
value less than or equal to one at one significant figure in accordance with
paragraph (A)(2)(b)(iv) of this rule, non-carcinogenic risk levels are met on
the property. When the summed ratios result in a value greater than one the
non-carcinogenic risk levels are not met and remedial action is required.
Equation 2 - cumulative noncancer risk ratio for affected media
[(chema/SCNSa) + (chemb/SCNSb) + ...] = cumulative noncancer risk ratio
Non-cancer risk ratios for non-carcinogenic COCs which do not exhibit the same toxic endpoint may be excluded from the calculation of the cumulative non-cancer risk ratio described above if a written justification for such exclusion is submitted. The consideration of all major toxic endpoints and mechanisms of action shall include, at a minimum, those identified with the critical effect upon which the reference dose or reference concentration for each non-carcinogenic COC is based. The source for each reference dose and reference concentration for each non-carcinogenic chemical for which generic direct-contact soil standards are derived, are cited in Ohio EPA's "Support Document for the Development of Generic Numerical Standards and Risk Assessment Procedures." It may be necessary to calculate more than one cumulative non-cancer risk ratio for a property that results from the segregation of non-carcinogenic COCs based on toxic endpoints or mechanisms of action.
(3)
For situations
where a COC poses both carcinogenic and non-carcinogenic risks and a value for
the COC is listed in both the "Standard for a Single Chemical Carcinogens"
column and the "Standard for a Single Chemical Non-Carcinogens" column in the
tables in appendix A to this rule, or an applicable single chemical carcinogen
and non-carcinogen standard is determined in accordance with rule
3745-300-09
of the Administrative Code, the COC shall be included in the multiple
carcinogenic chemical adjustment calculation under paragraph (F)(1) of this
rule and the adjustment calculation for multiple non-carcinogenic chemicals
under paragraph (F)(2) of this rule. The applicable standard for the COC is the
lowest of the values determined using the equations in this paragraph or, if
appropriate, the soil saturation concentration.
(F) Generic numerical standards for surface water.
(1)
Applicability.
(a)
The generic
numerical standards for surface water in paragraph (G)(2) of this rule apply to
a property in accordance with paragraph (F) of rule
3745-300-07
of the Administrative Code.
(b)
For all releases
of petroleum to surface water of the state, the generic petroleum standards are
in paragraph (B) of this rule.
(2)
Generic surface
water standards.
(a)
For all releases or source areas of hazardous
substances on or from the property to surface waters of the state, surface
water chemical concentrations shall be compared to the chemical criteria
pursuant to Chapter 3745-1 of the Administrative Code. The outside mixing zone
average criteria for human health and aquatic life and wildlife should be
compared against ambient samples averaged over a thirty-day period. Single
ambient samples shall not exceed the outside the mixing zone maximum or the
outside the mixing zone average, if a thirty-day average is not obtained. If
all chemical constituents are below the chemical criteria, then the surface
water may be eliminated as an exposure medium. If chemical constituents exceed
the chemical criteria, then the surface water shall be further assessed in
accordance with rule
3745-300-09
of the Administrative Code. For the purposes of this rule, the generic
numerical standards for surface water apply regardless of whether the release
or source area of hazardous substances is a point source or nonpoint
source.
(b)
All regulated point source discharges of pollutants to
surface waters of the state and any other regulated discharges that occur from
or on the property shall comply with all permit and other applicable
requirements of the Water Pollution Control Act, Chapter 6111. of the Revised
Code, and the regulations adopted thereunder. The permit and other applicable
requirements of point source discharges include, but are not limited to, the
following:
(i)
The national pollutant discharge elimination system permit
issued pursuant to Chapter 3745-33 of the Administrative Code (also referred to
as Ohio NPDES permits).
(ii)
The water quality certification issued pursuant to
Chapter 3745-32 of the Administrative Code.
(iii)
A volunteer may
obtain a consolidated standards permit for activities conducted in connection
with a voluntary action which require permits from the
director.
(c)
Storm water associated with industrial activity that is
discharged to surface waters of the state or is discharged through a separate
municipal storm sewer system shall comply with the applicable requirements in
40
CFR 122.26.
(G) Generic numerical standards for human exposure to sediments.
(1)
Applicability.
(a)
For purposes of this rule and rule
3745-300-07
of the Administrative Code, human health exposure pathways to sediments are
considered complete when the surface water which contains the sediments meets
either of the following criteria:
(i)
Produces or can produce a consistent supply of
edible-sized fish and the COCs in the sediment are persistent, bioaccumulative,
and toxic.
(ii)
Is reasonably anticipated to support recreational
activities such as wading, swimming, or boating.
(b)
For all releases
of petroleum on or from the property to surface waters of the state which
contain sediments, the generic petroleum standards are in paragraph (B) of this
rule.
(c)
If the concentrations of COCs in sediment exceed the
generic numerical standards for human exposure to sediment, the volunteer shall
conduct a human health property-specific risk assessment following the
methodology described in paragraph (D) of rule
3745-300-09
of the Administrative Code or shall conduct a remedy in accordance with
3745-300-11 of the
Administrative Code.
(2)
Generic numerical
standards for human exposure to sediment.
(a)
Generic
direct-contact standards for sediments are the generic direct-contact soil
standards for residential land use specified in table I of appendix A to this
rule. Cumulative adjustment for multiple chemicals shall be evaluated in
accordance with paragraph (A)(2)(b) of this rule.
(b)
If COCs in
sediment are persistent, bioaccumulative, and toxic, and the surface water that
contains the sediments produces or can produce a consistent supply of
edible-sized fish, the volunteer shall conduct a human health property-specific
risk assessment in accordance with rule
3745-300-09
of the Administrative Code to evaluate fish consumption.
(H) Generic numerical standards for exposure of important ecological resources to sediments.
(1)
Applicability. The volunteer shall do either of the
following:
(a)
Sample sediments directly and apply the applicable standards
in accordance with paragraph (H)(2) of this rule.
(b)
Demonstrate
compliance with applicable standards in accordance with paragraph (F)(5) of
rule
3745-300-09
of the Administrative Code.
(2)
Generic numerical
standards for exposure of important ecological resources to sediments. To apply
applicable standards to sediments in accordance with paragraph (H)(1)(a) of
this rule, the volunteer shall compare the concentration of COCs to one of the
following ecological reference values:
(a)
Ohio-specific
sediment reference values by ecoregion in table I of appendix B to this
rule.
(b)
Consensus-based threshold effects concentration values
from MacDonald Ingersoll and Berger's "Development and Evaluation of
Consensus-based Sediment Quality Guidelines for Freshwater Ecosystems" in table
II of appendix B to this rule.
(3)
If concentrations
of COCs do not exceed the generic numerical standards identified pursuant to
paragraph (H)(2) of this rule, then the applicable standards are
met.
(4)
The volunteer shall evaluate the sediments in
accordance with paragraph (F) of rule
3745-300-09
of the Administrative Code, or shall conduct a remedy in accordance with rule
3745-300-11 of the
Administrative Code if any of the following criteria apply:
(a)
The sediments
exceed applicable standards in accordance with this rule.
(b)
The sediment
samples were not compared to the sediment values in accordance with paragraph
(H)(2) of this rule.
(I) Development of soil standards for leaching of COCs from soil to ground water.
(1)
Applicability.
(a)
Soil standards for leaching may be developed when one
or more ground water zones are determined to meet unrestricted potable use
standards and the potential for leaching of COCs from soil to ground water is
determined to be a complete exposure pathway.
(b)
Soil standards
for leaching may be developed when one or more ground water zones are
determined to exceed unrestricted potable use standards and the potential for
leaching of COCs from soil to ground water is a complete exposure pathway that
shall be evaluated in accordance with either of the following:
(i)
Applicable ground
water response requirements in paragraph (E) of rule
3745-300-10
of the Administrative Code.
(ii)
A pathway
completeness determination in paragraph (F)(1) of rule
3745-300-07
of the Administrative Code.
(2)
Soil standards
for leaching.
(a)
Soil standards for leaching when the underlying ground
water zone meets unrestricted potable use standards. Soil standards for
leaching are the soil concentrations determined to be protective of the
applicable ground water zone and shall not cause unrestricted potable use
standards to be exceeded in the ground water zone as demonstrated in accordance
with paragraph (F)(4)(a) of rule
3745-300-07
of the Administrative Code.
(b)
Soil standards
for leaching when the underlying ground water zone exceeds unrestricted potable
use standards.
(i)
Soil standards for leaching are the soil concentrations
determined to be protective of the applicable ground water response
requirements for the ground water zone as determined by rule
3745-300-10
of the Administrative Code.
(ii)
Soil standards
for leaching are the soil concentrations determined to be protective of any
other applicable standard in ground water that shall be met in accordance with
a pathway completeness determination and the demonstration of compliance with
applicable standards.
Replaces: 3745-300-08, 3745-300-08 appendix
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