Laserfiche WebLink
Closure Report 32 <br /> Golden Grain Manteca Bean Facility,299 Moffat Boulevard,Manteca,California July 16,1996 <br /> 1 <br /> Risk = Dose x Toxicity Factor <br /> ' where <br /> Dose = Concentration in the environmental medium x Exposure Parameters <br /> Dose Is calculated by using the equations presented in section 6 3 4 which Involve the Incorporation <br /> of the assumed exposure parameters The toxicity factors and the exposure parameters are also <br /> known, therefore, the concentration of a specific chemical in the environmental medium Is the only <br /> unknown entity In the equation presented above This unknown entity can be calculated and <br /> ' becomes the nsk-based cleanup goal <br /> ' 6.3.7 Proposed Cleanup Goals for Soil COPCs <br /> Table H-2 presents the calculated risk-based cleanup goals that are protective of the hypothetical <br /> ' commercial receptor and the hypothetical construction worker Tables H-3 and H-4 are the <br /> spreadsheets demonstrating how these proposed cleanup goals were developed <br /> 6 3 8 Results and Recommendations <br /> The proposed cleanup goals apply to soils at a maximum depth of 15 feet bsg because the activities <br /> of a hypothetical commercial worker and a hypothetical construction worker will not involve contact <br /> with soils at lower depths The analytical data from the surface sod samples collected at the site did <br /> not have detectable concentrations of BTEX and TPH <br /> ' The soil samples were also analyzed for Title 22 metals The results Indicate that although some of <br /> the inorganic constituents, namely arsenic, chromium, and thallium, exceeded the preliminary <br /> remedial goals established by the USEPA Region IX, the maximum detected concentrations are <br /> within the range of background levels <br /> 1 Based on the results of the nsk-based approach, the detected chemical concentrations In the sod at a <br /> maximum depth of 15 feet do not warrant remedial action Concentrations that may exceed the <br /> nsk-based goals in sods at depths lower than 15 feet bsg may potentially impact the groundwater <br /> ' rather than any potential receptor to the site soils However, potential migration of soil COPCs to the <br /> groundwater are predicted to remain contained within the site boundaries (see section 5 0) It is, <br /> ' therefore, recommended that Golden Gram's Manteca Bean Facility be closed without any further <br /> ' 42020213 GR <br /> FLUOR DANIEL GTI <br /> i <br />