Human Health Risk Assessment - Raytheon

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ATn = Averaging time for non-carcinogens (days) 32 Human Health Risk Assessment DRAFT The LADD is calculated using equation (4-21). Subsurface soil concentrations were estimated using equation (4-19) and exposure point concentrations for subsurface soils on-Site are reported in Table 5. Soil parameters were chosen to be consistent with a loamy sand. Exposure factors are summarized in Table 6. We have assumed a soil ingestion rate of 330 mg/day (0.00033kg/day) based on USEPA guidance (USEPA, 2002b). Dose and risk calculations for potential exposures to COPCs via incidental ingestion of subsurface soils by on-Site landscape/maintenance workers are provided in Appendix A; Table A-5. Inhalation of Air During Subsurface Excavation. Construction workers could also be exposed to COPCs volatilized from the surface of the exposed groundwater. The ADD received from inhalation of outdoor air is calculated according to equation (4-20) where the EPC is the concentration of COPCs in outdoor air as described in sections 4.2.4. The LADD is calculated using equation (4-21). Exposure point concentrations for on-Site outdoor air in the vicinity of subsurface excavation activities are reported in Table 5 and exposure factors are summarized in Table 6. Dose and risk calculations for potential exposures to COPCs via inhalation of outdoor air by on- Site landscape/maintenance workers involved in subsurface excavation activities are provided in Appendix A; Table A-6. 4.3.5 On-Site Utility Worker Dermal Contact with Groundwater. For the purpose of estimating potential risks to utility workers involved in subsurface excavation activities, it is assumed that a construction/utility worker may be dermally exposed to saturated soil and groundwater for 2 hours per day, 8 days per year for 10 years. It is assumed that the worker is wearing long pants, shoes and a shortsleeved shirt but the worker’s head, hands, and forearms could be exposed to groundwater. The dermally absorbed dose of COPCs received from contact with groundwater is calculated using equations (4-22) through (4-24) and the LADD is calculated using equation (4-21) with the exception that the ADD is replaced by the DAD. Exposure point concentrations for on-Site shallow groundwater are reported in Table 5 and exposure factors for on-Site utility/construction workers are summarized in Table 6. Dose and risk calculations for potential exposures to COPCs via dermal contact with exposed groundwater by on-Site construction/utility workers are provided in Appendix A; Table A-7. Incidental Ingestion of Soil. Some incidental ingestion of soil may occur during subsurface excavation activities. The average daily dose (ADD) from ingestion of soil is calculated using equation (4-25). The LADD is calculated using equation (4-21). Subsurface soil concentrations were estimated using equation (4-19) and exposure point concentrations for subsurface soils on-Site are reported in Table 5. Soil parameters were chosen to be consistent with a loamy
33 Human Health Risk Assessment sand with a dry soil bulk density of 1.62 L/kg and a volumetric water content of 39% for saturated soils. Exposure factors are summarized in Table 6. DRAFT Dose calculations for potential exposures to COPCs via incidental ingestion of subsurface soil by on-Site construction/utility workers are provided in Appendix A; Table A-8. Inhalation of Air During Subsurface Excavation. If groundwater containing COPCs is exposed during the subsurface excavation activities, volatile constituents may be released to outdoor air. The ADD received from inhalation of outdoor air in the vicinity of the subsurface excavation is calculated according to equation (4-20) where the EPC is the concentration of COPCs in outdoor air as described in sections 4.2.5. The LADD is calculated using equation (4-21). Exposure point concentrations for on-Site outdoor air in the vicinity of subsurface excavation activities are reported in Table 5 and exposure factors for on-Site construction/utility workers are summarized in Table 6. Dose and risk calculations for potential exposures to COPCs via inhalation of outdoor air by construction/utility workers involved in subsurface excavation activities are provided in Appendix A; Table A-9. 4.3.6 Azalea Park Landscape/Maintenance Worker Currently, the City of St. Petersburg maintains the ballfields and landscaping at Azalea Park using reclaimed water supplied by the City and there are no irrigation wells in use at the park. In addition, a clean water layer prevents potential volatilization of COPCs from underlying groundwater so no potential exposure pathways are complete for Azalea Park landscape workers. 4.3.7 Azalea Park Ball Player and Recreation Center Employees Ballplayers and other individuals participating in recreational activities at the park could also be exposed to COPCs that have volatilized to outdoor air. However, as previously mentioned, a clean water layer prevents potential volatilization of COPCs from underlying groundwater so no potential exposure pathways are complete for Azalea Park ball players and workers/visitors to the Recreation Center. 4.3.8 Pinellas Trail User Because areas of the Pinellas Trail are located adjacent to the former source area, we have evaluated potential risks to users of the Pinellas Trail from exposure to COPCs volatilized from nearby areas on-Site. In this scenario, we have assumed that an avid jogger pushes a stroller along the Pinellas trail an average of 200 days per year for 30 years. The jogger makes several passes along the boundary of the Site and is exposed to COPCs in outdoor air for a total of 0.25 hours per day. For childhood exposures used to estimate the ADD for noncarcinogens, we assume that the child accompanies the parent initially in the stroller and then on bicycle. The ADD received under this scenario is calculated according to equation (4-20). The LADD for
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Page 5 and 6: Executive Summary 1 Human Health Ri
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Page 11 and 12: 2 Conceptual Site Model 7 Human Hea
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Page 35: where: DAD = Dermal absorbed dose (
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Page 59 and 60: 7 Uncertainty Analysis 55 Human Hea
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DRAFT Table A-5. Dose and Risk Calc
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DRAFT CSFd RfDd DA event C w DAD LA
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DRAFT Table A-9. Dose and Risk Calc
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DRAFT CSFd RfDd DA event C w DAD LA
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DRAFT Table A-13. Dose and Risk Cal
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Human Health Risk Assessment - Raytheon

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