Figure 1: Overview of LDEQ's Risk Evaluation/Corrective

**The submitter may proceed to MO-1, MO-2 or MO-3.***The submitter may proceed to MO-2 or MO-3.

* The submitter may select which option the AOC/AOI is managed under if the AOC/AOI qualifies for management under the option selected.

Figure 1:Overview of LDEQ's

Risk Evaluation/Corrective Action Program

Comply with MO-1 Closure/Post-closure

Requirements (if applicable)

No Further Action

at this time

Remediate to MO-1 RSComply with Post-remediation

Requirements

*Management Option 1 Are site concentrations

less than or equal toMO-1 RS?

*Management Option 2 Are site concentrations

less than or equal to MO-2 RS?

*Management Option 3 Are site risks acceptable?

orAre site concentrations

less than or equal to MO-3 RS?

Remediate To MO-3 RSComply with Post-

Remediation Requirements

NO

YES

NO

NO***

NO**

YES

YES

YES

Remediate to MO-2 RSComply with Post-remediation

Requirements

Comply with MO-3 Closure/Post-Closure


Comply with MO-2 Closure/Post-closure


*Screening Option Are site concentrations less than or equal to the

SS?

LOUISIANA DEPARTMENT OF ENVIRONMENTAL QUALITY 2003

SSMO-1

RS"Zero" Constituent Concentration

MO-2RS

MO-3RS

Very High Constituent

Concentration

NOTE: MO= Management Option, RS=RECAP Standards SS=Screening Standards

Figure 2: LDEQ Risk Evaluation/Corrective Action Program

Comparison of Screening Standards (SS) and RECAP Standards (RS)

No Further Study Warranted

RECAPStandard

Remedial ActionWarranted


Figure 3: Groundwater Classification Chart

CLASS 1B CLASS 2C CLASS 3B

CLASS 2B CLASS 2C CLASS 3B

CLASS 3A CLASS 3A CLASS 3A CLASS 3B

TOTAL DISSOLVED SOLIDS (TDS)(mg/l)

YIEL

D(g

allo

ns/d

ay)

0 1,000 10,000

800

4,800

NOTE:

CLASS 1A - Currently supplies a public water supply.

CLASS 2A - Currently supplies a domestic, agricultural, or other supply.


Figure 4Identification of the AOI Based on Land Use

Industrial Soil AOI- Soili- SoilGW

- Soilsat

Residential Soil AOI- Soilni

- SoilGW

- Soilsat

Industrial Facility

Residential Area


Figure 5Identification of the AOI for Soiles

Enclosed Structure Soil AOI- Soili or Soilni

- SoilGW

- Soilsat

Soiles AOI- Soiles


Figure 6Identification of the AOI for GWes

Enclosed Structure Groundwater AOI- GW1,2, or 3

- Watersol

GWes AOI- GWes


Figure 7Identification of the AOI for Soil-PEF

Soil AOI- Soili or Soilni

- SoilGW

- Soilsat

Unpaved Road

Soil-PEF AOI- Soil-PEF


Figure 8:Conceptual Model Example

Area of Release

Mixing & Infiltration Soil

Storm Water Runoff

Surface Water

Sediment

RELEASE MECHANISM

2

RELEASE MECHANISM

1

PRIMARY SOURCE

TERTIARY SOURCE

SECONDARY SOURCE

EXPOSURE ROUTE

POTENTIAL RECEPTOR

Direct Contact

Wind Air/Dust

Direct Contact

Ground Water

Surface Water

Sediment

Infiltration/Percolation

Storm Water Runoff

Wind Air

Dermal

IngestionInhalation

Biota

DermalIngestion

Inhalation

DermalIngestion

Dermal

IngestionInhalation

Biota

Inhalation

Dermal

IngestionInhalation



Figure 9:Relationship Between Point of Exposure (POE)

and Point of Compliance (POC) for Groundwater

GWss and GW1GROUNDWATER FLOW DIRECTION

O=CONTAMINATION SOURCEPOC=XPOE=THROUGHOUT AQUIFER

GW2Example A Example B

ROAD

E1 E2

POE=E1 OR E2

GW3 SURFACE WATER

EPOE=E

*This figure refers to Section 2.11

Site Boundaries


Figure 10:Identification of a Soil Screening Standard or a Soil RECAP

Standard*SoilSS or SoilRS

Select the lower of the applicable standards*

Limiting SoilSS or SoilRS

*See Appendix H for methods used to develop Soil SS and SoilRS and the methods for identifying the limiting soil SS or RS.

Carcinogenic Effects

Risk-Based Soili or Soilni

Noncarcinogenic Effects Risk-Based Soili or Soilni

Soil Concentration Protective of Groundwater

SoilGW

Soil Saturation Concentration

SoilSAT

Select the Lower of the Risk-BasedSoili or Soilni


Figure 11:Development of Soil Screening Standard for Soil

Concentration Protective of Groundwater* (SoilSSGW)

Identify the Groundwater Standard (GW1)

Apply to Soil-Groundwater Partition Equation

Multiply by a Dilution Factor of 20

SoilSSGW

* See Appendix H for method used to develop the Soil SSGW.



Figure 12:Development of Groundwater Screening Standard

& RECAP Standard for a Groundwater 1 Zone*

(GWSS and GW1)

Safe Drinking Water Act (SDWA)Maximum Contaminant Level

No Yes

Select the lower of these values

*See Appendix H for methods used to develop GW SS and GW1.

Limiting Groundwater SS or RS to be met throughout the aquifer.

Yes or NoCarcinogenic Effects

Risk-Based GWss or GW1

Noncarcinogenic Effects Risk-Based GWss or

GW1

Select the Lower of the Risk-Based

Levels GWss or GW1

Watersol


Figure 13:Development of Soil RECAP Standard for Soil Concentration

Protective of Groundwater* (SoilGW)

Identify the Appropriate Groundwater RS based on the use of the Groundwater to

be Protected (GW1, GW2, GW3DW, or GW3NDW)

Multiply by a Dilution Factor

* See Appendix H for methods used to develop the Soil GW. In lieu of developing a SoilGW, the soil to groundwater pathway may be evaluated using a leach test.

MO-2Apply to Soil-Groundwater Partition Equation

orDevelop Site-specific Soil-groundwater

Partition Coefficient

Choose

MO-1Apply to Soil-Groundwater

Partition Equation

SoilGW1, SoilGW2, SoilGW3DW, or SoilGW3NDW


Figure 14:Development of Groundwater RECAP Standard

for a Groundwater 2 Zone*(GW2)

Watersol Multiply by Dilution Factor

*See Appendix H for methods used to develop GW 2.

Yes or No

Yes

No

Select the Lower of the Risk-Based

Levels GW2

Carcinogenic Effects Risk-Based

GW2

Noncarcinogenic Effects

Risk-Based GW2

Limiting Groundwater RS to be met at Point of Compliance (POC)


Safe Drinking Water Act (SDWA) Maximum Contaminant Level

Limiting Groundwater RS to be Met at Point of Exposure (POE)


Figure 15:Development of Groundwater RECAP Standard

for a Groundwater 3 Zone*(GW3)

Human Health Non-Drinking Water Supply Criterion

Human Health Drinking Water Supply Criterion

(LAC 33:IX.1113) (LAC 33:IX.1113)

Multiply by a Dilution Factor Based on Distance to Nearest Downgradient

Surface Water Body and Thickness of Groundwater Source

Watersol


*See Appendix H for methods used to develop GW 3.

Select the Appropriate Criterion Based on

Designated Use of the Surface Water Body to be

protected

Compare to GW2

Select the higher of these values

Limiting Groundwater RS to be met at Point of Compliance (POC)


Figure 16:Identification of the Limiting RS for Soils Impacted

From Ground Surface to a Depth of 15 feet bgs

Surface

Limiting RS is the lower of:1. Soili or Soilni2. Soilsat3. SoilGW

15 feet


Figure 17:Identification of the Limiting RS for Soils Impacted From Ground Surface to a Depth of >15 feet bgs

Surface

Limiting RS is the lower of:1. SoilGW

2. Soilsat

Limiting RS is the lower of:1. Soili or Soilni2. Soilsat3. SoilGW

15 feet


Figure 18:Identification of AOI Concentration

and RECAP Standards for Impacted Soils

If the depth of impact is equal to or less than

15 feet bgs

Determine the AOIC from ground surface to depth of

impact

Compare to limiting

surface soil RS*

If the depth of impact is

greater than 15 feet bgs

Determine the AOIC for 0-15 feet

bgs

Determine the AOIC from ground surface to depth of

impact

Compare to limiting

subsurface soil RS*

Compare to limiting

surface soil RS*

* Refer to Appendix H for guidelines on identifying the limiting RS.

1

2


Figure 19:Identification of Compliance Concentration,

Source Concentration, and RECAP Standards for Impacted Groundwater

If a Groundwater 1 zone is impacted

Determine the compliance

concentration at the POC*


concentration at the POC*

Use as model input to evaluate

constituent migration


Compare to the lower RS:GW2 or Watersol


Determine the source

concentration

Compare to the lower RS:GW3 or Watersol

Use as model input to evaluate

constituent migration

Compare to the lower RS:

GW1 or Watersol

Determine the source

concentration


concentration at the POC

* If exposure to impacted groundwater is occurring, determine the exposure concentration at the POE.

Note: A DAF shall not be applied to a GW RS that is compared to an exposure concentration at the POE.


Documents

Figure 1: Overview of LDEQ's Risk Evaluation/Corrective