LDEQs RECAP Soil Protective of Groundwater Soil GW

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LDEQ’s RECAP Soil Protective of Groundwater - Soil. GW Soil Saturation - Soilsat

LDEQ’s RECAP Soil Protective of Groundwater - Soil. GW Soil Saturation - Soilsat

SOILGW & SOILSAT · Soil. GW values are soil concentrations for constituents of concern

SOILGW & SOILSAT · Soil. GW 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.

MO-1: Determination of Soil. GW for Organic COC 1. Identify the appropriate GW classification

MO-1: Determination of Soil. GW for Organic COC 1. Identify the appropriate GW classification ex. Shallow groundwater - GW 3 NDW Determine the GW value for the COC ex. COC is Benzene, GW 3 NDW = 0. 013 mg/l < Watersol 2. Use GW value to calculate Csoil ex. Csoil = 0. 00668 =

MO-1: Soil. GW Organic COC cont. 3. Multiply Csoil by vertical DF of 20

MO-1: Soil. GW Organic COC cont. 3. Multiply Csoil by vertical DF of 20 ex. Soil. GW = 0. 00668 * 20 = 0. 13 4. Multiply Soil. GW by DF from Table in Appendix I ex. From Table x = 300 & Sd = 10 then DF = 15 Soil. GW 3 = 0. 13 * 15 = 1. 95

MO-1: Soil. GW Organic COC cont. 5. If the Soil. GW 3 value from

MO-1: Soil. GW Organic COC cont. 5. If the Soil. GW 3 value from Step 4 is lower than the next more protective groundwater classification Soil. GW value then use the more protective groundwater classification Soil. GW value ex. Soil. GW 3 = 1. 95 Soil. GW 2 = 0. 051 Soil. GW 3 > Soil. GW 2 Therefore, use Soil. GW 3 as the Soil. GW value

MO-1: Determination of Soilsat = 900 = Soilsat is not applicable to constituents that

MO-1: Determination of 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 20 o C)

MO-1: Determination of Soil. GW for Inorganic COC If TCLP level available: Soil. GW

MO-1: Determination of Soil. GW for Inorganic COC If TCLP level available: Soil. GW = TCLP level * 20 If TCLP level not available: Soil. GW = GW 1 * 100 * 20

MO-2: Determination of Soil. GW Method 1 -Organic COC: 1. Identify the appropriate GW

MO-2: Determination of Soil. GW Method 1 -Organic COC: 1. Identify the appropriate GW classification ex. Shallow groundwater - GW 3 NDW Determine the GW value for the COC ex. COC is Benzene, GW 3 NDW = 0. 013 mg/l < Watersol 2. Use GW value to calculate Csoil ex. Csoil = 0. 00668 =

MO-2: Soil. GW Method 1 -Organic COC cont. 3. Multiply Csoil by site-specific DF

MO-2: Soil. GW Method 1 -Organic COC cont. 3. Multiply Csoil by site-specific DF Soil. GW 3 = 0. 00668*DAFSummers*DAFDomenico 4. If the Soil. GW 3 value from Step 3 is lower than the next more protective groundwater classification Soil. GW value then use the more protective groundwater classification Soil. GW value Soil. GW 3 = 0. 00668*DAFSummers*DAFDomenico > or < Soil. GW 2 If Soil. GW 3 > Soil. GW 2 use Soil. GW 3 If Soil. GW 3 < Soil. GW 2 use Soil. GW 2

MO-2: Determination of Soil. GW Method 1 -Inorganic COC If TCLP level available: Soil.

MO-2: Determination of Soil. GW Method 1 -Inorganic COC If TCLP level available: Soil. GW = TCLP level * 20 If TCLP level not available: Soil. GW = GW 1 * 100 * 20

MO-2 Determination of Soil. GW Method 2 -Organic and Inorganic COC This method may

MO-2 Determination of Soil. GW Method 2 -Organic and 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: Soil. GW Method 2 -Organic and Inorganic COC cont. 1. Calculate site specific

MO-2: Soil. GW Method 2 -Organic and Inorganic COC cont. 1. Calculate site specific water/soil partition coefficient to determine Soil. GW = (Soil. SS / GWSS) * GW 1, 2 or 3 GWSS & Soil. SS - site-specific values (see footnotes on sample requirements p. I-49) GW 1, 2 or 3 - refer to Table 2. Multiply Soil. GW by appropriate site-specific DF

MO-2: Determination of Soil. GW Method 3 -Organic and Inorganic COC Synthetic Precipitate Leaching

MO-2: Determination of Soil. GW 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 Soil. GW is not an issue

MO-2: Determination of Soil. GW Method 3 -Organic and Inorganic COC How is the

MO-2: Determination of Soil. GW Method 3 -Organic and Inorganic COC How is the SPLP data used to evaluate the soil to gw pathway? p p p Soil. GW 1: Compare SPLP to GW 1 x DFSummers Soil. GW 2: Compare SPLP to GW 2 x DFSummers x DF 2 Soil. GW 3: Compare SPLP to GW 3 x DFSummers x DF 3

MO-2: Determination of Soil. GW Method 3 -Organic and Inorganic COC cont’d. p If

MO-2: Determination of Soil. GW Method 3 -Organic and Inorganic COC cont’d. p If SPLP <, then screen out soil to gw pathway p If SPLP >, then delineate area of concern p SPLP vs TCLP p SPLP vs LRS