Methylstyrene, alpha- cleanup levels by state
- CAS 98-83-9
- 3 states
CAS 98-83-9 is in the cleanup-level tables of 3 states in this handbook: Florida (Methyl styrene, alpha), Pennsylvania (METHYLSTYRENE, ALPHA) and Texas (Methylstyrene, alpha-). Each state's numbers are below as its agency prints them. The states run different programs and do not define their values the same way, so a number from one is not the same measure as a number from another. A state that lists the substance under another CAS number, or without one, is not shown here.
Florida
- FL DEP
- Chapter 62-777 CTLs
- February 2005
For Methyl styrene, alpha, DEP's cleanup target level tables print 1,500 mg/kg for residential direct exposure to soil and 11 mg/kg for soil leachability based on groundwater.
- 1,500mg/kg 1500 Direct Exposure - Residential Table II: Soil Cleanup Target Levels
- 11mg/kg Leachability Based on Groundwater Table II: Soil Cleanup Target Levels
Pennsylvania
- PA DEP
- Act 2 Statewide Health Standards
For METHYLSTYRENE, ALPHA, DEP's Statewide Health Standard tables print 2,400 μg/L for residential groundwater in a used aquifer with TDS up to 2500, 10,000 mg/kg for residential soil direct contact from 0 to 15 feet, and two residential soil to groundwater values for a used aquifer with TDS up to 2500: 240 mg/kg as 100 X GW MSC and 420 mg/kg as the generic value.
- 2,400μg/L 2400 R Table 1: Medium-Specific Concentrations (MSCs) for Organic Regulated Substances in Groundwater Used Aquifers, TDS ≤ 2500
- 10,000mg/kg 10000 0-15 feet Table 3a: Medium-Specific Concentrations (MSCs) for Organic Regulated Substances in Soil: A. Direct Contact Numeric Values Residential
- 240mg/kg 100 X GW MSC Table 3b: Medium-Specific Concentrations (MSCs) for Organic Regulated Substances in Soil: B. Soil to Groundwater Numeric Values Used Aquifers, TDS ≤ 2500, Residential
- 420mg/kg Generic Value Table 3b: Medium-Specific Concentrations (MSCs) for Organic Regulated Substances in Soil: B. Soil to Groundwater Numeric Values Used Aquifers, TDS ≤ 2500, Residential
Texas
- TCEQ
- TRRP Tier 1 PCLs
- February 6, 2025
For Methylstyrene, alpha-, TCEQ's Tier 1 table prints 280 mg/kg for TotSoilComb and 6.5 mg/kg for GWSoilIng (residential soil, 0.5 acre source area), and 0.2 mg/L for GWGWIng (residential groundwater).
- 280mg/kg 2.8E+02 TotSoilComb Table 1: Tier 1 Residential Soil PCLs 0.5 acre source area
- 6.5mg/kg 6.5E+00 GWSoilIng Table 1: Tier 1 Residential Soil PCLs 0.5 acre source area
- 0.2mg/L 2.0E-01 GWGWIng Table 3: Tier 1 Groundwater PCLs - Residential and Commercial/Industrial Residential
Each agency's own publication governs: its current table, or the published rule where the agency says so. This page is a reference copy and not a cleanup decision. Check each agency's page before relying on a value.
Source
- Florida Department of Environmental Protection, Cleanup Target Levels for Chapter 62-777, F.A.C., dated February 2005. Files read October 6, 2026.
- Pennsylvania Department of Environmental Protection, Statewide Health Standard Medium-Specific Concentrations.
- Table 1: DEP's file dated April 14, 2022, read October 5, 2026.
- Table 3a: DEP's file dated January 4, 2022, read October 5, 2026.
- Table 3b: DEP's file dated January 19, 2022, read October 5, 2026.
- Texas Commission on Environmental Quality, Texas Risk Reduction Program Tier 1 Protective Concentration Levels, last revised February 6, 2025. File read October 1, 2026.