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HSCA Screening Level Table Comparison - April 2023 vs February 2022

Analyte CAS No. Observation Status Vol TAL
or
TCL
Soil
(mg/kg)
Key Groundwater
(ug/L)
Key Groundwater (VI)
(ug/L)
Sub Slab
and
Soil Gas
(ug/m3)
Ecological
Sediment Fresh
(mg/kg)
Ecological
Surface Water Fresh
(ug/L)
Ecological
Sediment Marine
(mg/kg)
Ecological
Surface Water Marine
(ug/L)
Ecological
Surface Soil
(mg/kg)
Ammonium perfluoro-2-methyl-3-oxahexanoate 62037-80-3 April 2023 n     0.019 RSL 0.006 RSL
Asulam 3337-71-1 February 2022 n     230 RSL 72 RSL                                                                                           
Asulam 3337-71-1 April 2023 n     2300 RSL 720 RSL                                                                                           
Asulam ............... Change Effect . . ... 2070 ..... 648 ......                                                                                           
Cypermethrin 52315-07-8 February 2022 n     450 RSL 140 RSL                                                                                           
DDD, p,p`- (DDD) 72-54-8 February 2022 n   TCL 0.19 RSL 0.0063 RSL                           0.00488 0.001 0.00122 0.001             
DDD, p,p`- (DDD) 72-54-8 April 2023 c   TCL 2.3 RSL 0.032 RSL                           0.00488 0.001 0.00122 0.001             
DDD, p,p`- (DDD) ............... Change Effect X . ... 2.11 ..... 0.0257 ......                                                                                           
Dibenzothiophene 132-65-0 February 2022 n V   78 RSL 6.5 RSL                                                                                           
Dibutyltin Compounds E1790660 February 2022 n     1.9 RSL 0.6 RSL                                                                                           
Dibutyltin Compounds E1790661 April 2023 n     1.9 RSL 0.6 RSL                                                                                           
Dibutyltin Compounds .......X....... Change Effect . . ...              .....              ......                                                                                           
Dichloroethylene, cis-1,2- 156-59-2 February 2022 n V TCL 16 RSL 3.6 RSL                                                                                           
Dichloroethylene, cis-1,2- 156-59-2 April 2023 n V TCL 6.3 RSL 2.5 RSL              140                                                                 
Dichloroethylene, cis-1,2- ............... Change Effect . . ... -9.7 ..... -1.1 ......                                                                                           
Ethyl Tertiary Butyl Ether (ETBE) 637-92-3 April 2023 c V   130 RSL 70 RSL              1200                                                                 
Hexafluoropropylene oxide dimer acid (HFPO-DA) 13252-13-6 April 2023 n V   0.023 RSL 0.006 RSL                                                                                           
MCPB 94-81-5 February 2022 n     28 RSL 6.5 RSL                                                                                           
MCPB 94-81-5 April 2023 n     280 RSL 65 RSL                                                                                           
MCPB ............... Change Effect . . ... 252 ..... 58.5 ......                                                                                           
Perfluorobutanesulfonate 45187-15-3 April 2023 n     1.9 RSL 0.6 RSL                                                                                           
Perfluorobutanesulfonic acid (PFBS) 375-73-5 April 2023 n     1.9 RSL 0.6 RSL                                                                                           
Perfluorohexanesulfonate 108427-53-8 April 2023 n     0.13 RSL 0.039 RSL                                                                                           
Perfluorohexanesulfonic acid (PFHxS) 355-46-4 April 2023 n     0.13 RSL 0.039 RSL                                                                                           
Perfluorononanoate 72007-68-2 April 2023 n     0.019 RSL 0.0059 RSL                                                                                           
Perfluorononanoic acid (PFNA) 375-95-1 April 2023 n     0.019 RSL 0.0059 RSL                                                                                           
Perfluorooctanesulfonate 45298-90-6 February 2022 n     0.13 RSLC 0.07 HAL                                                                                           
Perfluorooctanesulfonate 45298-90-6 April 2023 n     0.013 RSL 0.004 RSL                                                                                           
Perfluorooctanesulfonate ............... Change Effect . . ... -0.117 ...X. -0.066 XX....                                                                                           
Perfluorooctanesulfonic acid (PFOS) 1763-23-1 February 2022 n     0.13 RSLC 0.07 HAL                                                                                           
Perfluorooctanesulfonic acid (PFOS) 1763-23-1 April 2023 n     0.013 RSL 0.004 RSL                                                                                           
Perfluorooctanesulfonic acid (PFOS) ............... Change Effect . . ... -0.117 ...X. -0.066 XX....                                                                                           
Perfluorooctanoate 45285-51-6 February 2022 n     0.13 RSLC 0.07 HAL                                                                                           
Perfluorooctanoate 45285-51-6 April 2023 n     0.019 RSL 0.006 RSL                                                                                           
Perfluorooctanoate ............... Change Effect . . ... -0.111 ...X. -0.064 XX....                                                                                           
Perfluorooctanoic acid (PFOA) 335-67-1 February 2022 n     0.13 RSLC 0.07 HAL                                                                                           
Perfluorooctanoic acid (PFOA) 335-67-1 April 2023 n     0.019 RSL 0.006 RSL                                                                                           
Perfluorooctanoic acid (PFOA) ............... Change Effect . . ... -0.111 ...X. -0.064 XX....                                                                                           
Potassium perfluorobutanesulfonate 29420-49-3 April 2023 n     1.9 RSL 0.6 RSL                                                                                           
Potassium perfluorooctanesulfonate 2795-39-3 April 2023 n     0.013 RSL 0.004 RSL                                                                                           
Thallium Carbonate 6533-73-9 February 2022 n V   0.16 RSL 0.04 RSL                                                                                           
Thallium Carbonate 6533-73-9 April 2023 n     0.13 RSL 0.04 RSL                                                                                           
Thallium Carbonate ............... Change Effect . X ... -0.03 .....              ......                                                                                           
Thiocyanates E1790664 February 2022 n     1.6 RSL 0.4 RSL                                                                                           
Thiocyanates E1790665 April 2023 n     1.6 RSL 0.4 RSL                                                                                           
Thiocyanates .......X....... Change Effect . . ...              .....              ......                                                                                           
Tributyltin Compounds E1790678 February 2022 n     1.9 RSL 0.6 RSL                                        0.072              0.0074             
Tributyltin Compounds E1790679 April 2023 n     1.9 RSL 0.6 RSL                                        0.072              0.0074             
Tributyltin Compounds .......X....... Change Effect . . ...              .....              ......                                                                                           


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