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Corrective Action flan 10 <br /> Time Oil Cam an Property No 04-049 14000 Last Highway 88 Lockeford CA September 8 1998 <br /> workers Surface sods are evaluated for the former UST pit material backfilled in <br /> 1991 This pathway assumes the site is not paved and residential receptors will be <br /> exposed to wind blown particulates and vapors <br /> ❑ Inhalation of vapors volatilizing from subsurface sod and groundwater and <br /> migrating to outdoor air for on-site commercial receptors and off-site residential <br /> receptors RBSLs and SSTLS developed for residential exposure pathways will <br /> be compared to concentrations detected in soil and groundwater at the edges of the <br /> site, and not concentrations in the source area, to provide a more realistic <br /> evaluation of risk to these receptors <br /> El Inhalation of vapors volatilizing from subsurface sod and groundwater and <br /> migrating to indoor air for on-site commercial receptors and off-site residential <br /> receptors There is no evidence that soil or groundwater impacts are present <br /> beneath off-site residential dwellings, however, soil and groundwater <br /> concentrations detected at the edges of the site will be evaluated for this pathway <br /> to determine protective concentrations <br /> 3.3 TIER I ANALYSIS: RISK-BASET) SCREENING LEVELS <br /> RBSLs for the identified exposure pathways from ASTM E-1739-95 are provided in Table 7 <br /> The benzene RBSLs have been adjusted(multiplied by 0 29) for CaIEPA's 0 10 slope factor <br /> The Tier 1 levels for MTBE were calculated using the Groundwater Services, Inc RBCA Tool <br /> Kit, version 1 01 Tier 1 RBSLs for 1,2 Dibromoethane are Risk Based Concentrations <br /> recommended by EPA Region III as of April 15, 1998 <br /> Comparison of maximum site-specific soil and groundwater concentrations to these RBSLs <br /> demonstrates that site-specific concentrations of benzene and toluene in subsurface soils (> 5 feet <br /> Time O&Lockdord\CAP wpd <br />