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**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
Requirements (if applicable)
Comply with MO-2 Closure/Post-closure
Requirements (if applicable)
*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
LOUISIANA DEPARTMENT OF ENVIRONMENTAL QUALITY 2003
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.
LOUISIANA DEPARTMENT OF ENVIRONMENTAL QUALITY 2003
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
LOUISIANA DEPARTMENT OF ENVIRONMENTAL QUALITY 2003
Figure 5Identification of the AOI for Soiles
Enclosed Structure Soil AOI- Soili or Soilni
- SoilGW
- Soilsat
Soiles AOI- Soiles
LOUISIANA DEPARTMENT OF ENVIRONMENTAL QUALITY 2003
Figure 6Identification of the AOI for GWes
Enclosed Structure Groundwater AOI- GW1,2, or 3
- Watersol
GWes AOI- GWes
LOUISIANA DEPARTMENT OF ENVIRONMENTAL QUALITY 2003
Figure 7Identification of the AOI for Soil-PEF
Soil AOI- Soili or Soilni
- SoilGW
- Soilsat
Unpaved Road
Soil-PEF AOI- Soil-PEF
LOUISIANA DEPARTMENT OF ENVIRONMENTAL QUALITY 2003
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
LOUISIANA DEPARTMENT OF ENVIRONMENTAL QUALITY 2003
LOUISIANA DEPARTMENT OF ENVIRONMENTAL QUALITY 2003
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
LOUISIANA DEPARTMENT OF ENVIRONMENTAL QUALITY 2003
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
LOUISIANA DEPARTMENT OF ENVIRONMENTAL QUALITY 2003
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.
LOUISIANA DEPARTMENT OF ENVIRONMENTAL QUALITY 2003
LOUISIANA DEPARTMENT OF ENVIRONMENTAL QUALITY 2003
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
LOUISIANA DEPARTMENT OF ENVIRONMENTAL QUALITY 2003
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
LOUISIANA DEPARTMENT OF ENVIRONMENTAL QUALITY 2003
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)
Select the lower of these values
Safe Drinking Water Act (SDWA) Maximum Contaminant Level
Limiting Groundwater RS to be Met at Point of Exposure (POE)
LOUISIANA DEPARTMENT OF ENVIRONMENTAL QUALITY 2003
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
Select the lower of these values
*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)
LOUISIANA DEPARTMENT OF ENVIRONMENTAL QUALITY 2003
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
LOUISIANA DEPARTMENT OF ENVIRONMENTAL QUALITY 2003
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
LOUISIANA DEPARTMENT OF ENVIRONMENTAL QUALITY 2003
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
LOUISIANA DEPARTMENT OF ENVIRONMENTAL QUALITY 2003
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*
Determine the compliance
concentration at the POC*
Use as model input to evaluate
constituent migration
If a Groundwater 2 zone is impacted
Compare to the lower RS:GW2 or Watersol
If a Groundwater 3 zone is impacted
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
Determine the compliance
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.
LOUISIANA DEPARTMENT OF ENVIRONMENTAL QUALITY 2003