Laserfiche WebLink
SAFEWAY MEAT PACKING FACILITY, STOCKTON, CALIFORNIA <br /> TIER H RISK BASED CORRECTIVE ACTION <br /> FEBRUARY 26, 1196 <br /> PAGE 4 - 6 <br /> Table 10 provides the calculation of the SSTLs for COIs based on noncarcinogenic risk <br /> considerations Noncarcinogenic health effects are believed to have threshold doses, that is, a <br /> dose below which health effects will not occur Noncaremogeruc risks are characterized using <br /> a hazard quotient (HQ) <br /> HQ = Dose/Reference Dose (RM) <br /> If an HQ is below 1, noncarcinogenic health effects are not believed to occur To calculate the <br /> SSTLs, an HQ of I was used <br /> Table l I summarizes the SSTLs If the calculated SSTL in water was greater than the pure <br /> chemical water solubility in water, it would not be possible for unacceptable environmental <br /> concentrations develop Table I I indicates these levels by ">S " Similarly, if the calculated <br /> SSTL was greater than the soil saturation concentration (Cs,,), the SSTL can not be exceeded <br /> Table 1 I indicates these levels by "RES " <br /> All of the maximum measured concentrations of COIs in the soil and groundwater at the site are <br /> below all of the applicable SSTLs In particular, the maximum measured concentration of each <br /> COI is below the appropriate SSTL for the potentially complete pathways (See comparisons of <br /> measured results to SSTLs for groundwater volatilization to outdoor air and subsurface soil <br /> volatilization to outdoor air on Table I 1 ) The maximum soil levels are also three to four order <br /> of magnitude below SSTLs for the complete and potentially complete future exposure pathways <br /> associated with excavation (Table 11) <br /> The maximum measured concentration of benzene in the subsurface soil is below the RME SSTL <br /> for protection of groundwater quality (This groundwater value is based on a groundwater <br /> oiazcb,�l <br />