Laserfiche WebLink
SAFEWAY MEAT PACKING FACILITY, STOCKTON, CALIFORNIA <br /> TIER 11 RISK BASED CORRECTIVE ACTION <br /> FEBRUARY 26, 1996 <br /> PAGE 1 - 4 <br /> An additional exposure pathway that is potentially complete if soils are excavated in the future <br /> is <br /> C ingestion, dermal contact, and inhalation of soil particulates during excavation <br /> Excavation in the future might be required for a shallow foundation, utility installation and repair, <br /> or new tank installation Generally these activities involve movement of shallow soils, that is <br /> depths of five feet or less The majority of the impacted soil at Stockton is located at 20 feet <br /> below the ground surface, thus this exposure pathway is unlikely to be complete even with most <br /> soil excavation activities <br /> Exposure through ingesting groundwater impacted by chemicals in the vadose zone soil is <br /> incomplete under both current and foreseeable future conditions at the Stockton site However, <br /> 5 <br /> SSTLs were calculated for this pathway to assess the potential for long-term impacts on <br /> groundwater quality The SSTLs calculated for this exposure pathway have been used to evaluate <br /> soil and groundwater under existing conditions The effect of biological and chemical <br /> degradation over time have not been considered <br /> SSTLs for benzene, toluene, ethylbenzene, xylenes (BTEX), 1,2,4-trumethylbenzene, pyrene <br /> phenanthrene, and anthracene have been calculated based on target cancer risk of 1 x 10'5 and a <br /> noncarcinogennc hazard index of 1 All measured soil concentrations of the target compounds <br /> are below there applicable soil SSTLs for inhalation and direct exposure pathways The <br /> maximum measured site concentrations are also is below the all SSTLs for impacts to <br /> groundwater quality <br /> 0131CDd1 <br />