ldeq’s recap
DESCRIPTION
LDEQ’s RECAP. Soil Protective of Groundwater - Soil GW Soil Saturation - Soil sat. SOIL GW & SOIL SAT. Soil GW values are soil concentrations for constituents of concern that are protective of a groundwater use - PowerPoint PPT PresentationTRANSCRIPT
SoilGW values are soil concentrations for constituents of concern that are protective of a groundwater use
Soilsat values are the maximum soil concentrations allowed for constituents of concern. Above Soilsat free product is assumed to exist.
SOILGW & SOILSAT
1. Identify the appropriate GW classification ex. Shallow groundwater - GW3NDW
Determine the GW value for the COC ex. COC is Benzene, GW3NDW = 0.013 mg/l < Watersol
2. Use GW value to calculate Csoil
ex. Csoil = 0.00668 = 7.1
)228.0*15.021.0006.0*7.61*7.1(013.0
MO-1: Determination of SoilGW forOrganic COC
3. Multiply Csoil by vertical DF of 20 ex. SoilGW = 0.00668 * 20 = 0.13
4. Multiply SoilGW by DF from Table in Appendix I ex. From Table x = 300 & Sd = 10 then DF = 15
SoilGW3 = 0.13 * 15 = 1.95
MO-1: SoilGW Organic COC cont.
5. If the SoilGW3 value from Step 4 is lower than the next more protective groundwater classification SoilGW value then use the more protective groundwater classification SoilGW value
ex. SoilGW3 = 1.95 SoilGW2 = 0.051
SoilGW3 > SoilGW2
Therefore, use SoilGW3 as the SoilGW value
MO-1: SoilGW Organic COC cont.
Soilsat = 900 =
Soilsat is not applicable to constituents that are in the solid phase at ambient temperatures (i.e., constituents having melting points less than or equal to 20o C)
7.1
)228.0*15.021.0006.0*7.61*7.1(1750
MO-1: Determination of Soilsat
If TCLP level available: SoilGW = TCLP level * 20
If TCLP level not available: SoilGW = GW1 * 100 * 20
MO-1: Determination of SoilGW for Inorganic COC
1. Identify the appropriate GW classification ex. Shallow groundwater - GW3NDW
Determine the GW value for the COC ex. COC is Benzene, GW3NDW = 0.013 mg/l < Watersol
2. Use GW value to calculate Csoil
ex. Csoil = 0.00668 =7.1
)228.0*15.021.0006.0*7.61*7.1(013.0
MO-2: Determination of SoilGW
Method 1-Organic COC:
3. Multiply Csoil by site-specific DF SoilGW3 = 0.00668*DAFSummers*DAFDomenico
4. If the SoilGW3 value from Step 3 is lower than the next more protective groundwater classification SoilGW value then use the more protective groundwater classification SoilGW value
SoilGW3 = 0.00668*DAFSummers*DAFDomenico > or < SoilGW2
If SoilGW3 > SoilGW2 use SoilGW3
If SoilGW3 < SoilGW2 use SoilGW2
MO-2: SoilGW
Method 1-Organic COC cont.
If TCLP level available: SoilGW = TCLP level * 20
If TCLP level not available: SoilGW = GW1 * 100 * 20
MO-2: Determination of SoilGW
Method 1-Inorganic COC
This method may be used when the following conditions are met:
Groundwater and soil data are available,
Groundwater concentrations are less than soil concentrations, and
Groundwater data indicate the RS GW value has been exceeded
MO-2 Determination of SoilGW
Method 2-Organic and Inorganic COC
1. Calculate site specific water/soil partition coefficient to determine SoilGW
SoilGW = (SoilSS / GWSS) * GW1,2 or 3
GWSS & SoilSS - site-specific values (see footnotes on sample requirements p. I-49)
GW1,2 or 3 - refer to Table
2. Multiply SoilGW by appropriate site-specific DF
MO-2: SoilGW
Method 2-Organic and Inorganic COC cont.
MO-2: Determination of SoilGW
Method 3-Organic and Inorganic COC
Synthetic Precipitate Leaching Procedure (SPLP) - Used to evaluate Soil Protective of GW
- SW-846 Method 1312
- SPLPConcentration < (GW RS)(20)(DAF) then SoilGW is not an issue
How is the SPLP data used to evaluate the soil to gw pathway?
SoilGW1: Compare SPLP to GW1 x DFSummers
SoilGW2: Compare SPLP to GW2 x DFSummers x DF2
SoilGW3: Compare SPLP to GW3 x DFSummers x DF3
MO-2: Determination of SoilGW
Method 3-Organic and Inorganic COC
If SPLP <, then screen out soil to gw pathway
If SPLP >, then delineate area of concern
SPLP vs TCLP
SPLP vs LRS
MO-2: Determination of SoilGW
Method 3-Organic and Inorganic COC cont’d.