Human Health Risk Assessment - Raytheon

More documents

Recommendations

Info

6.1.6 Azalea Park Landscape/Maintenance Workers 50 Human Health Risk Assessment DRAFT 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 shallow clean water layer prevents potential volatilization of COPCs from underlying groundwater so no potential exposure pathways are complete for Azalea Park landscape workers. 6.1.7 Azalea Park Ball Player and Visitor to Azalea Park Recreation Center 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 shallow 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. 6.1.8 Pinellas Trail User Potential risks calculated for a frequent user of the Pinellas Trail are summarized below; COPCspecific risks are provided in Appendix A; Table A-10. The primary exposure pathway is inhalation of outdoor air. To be conservative, we have use onsite outdoor air concentrations for evaluating potential risks to Pinellas Trail users. Potential Risks to Pinellas Trail Users Exposure Non-Cancer Excess Pathway Hazard Quotient Cancer Risk Inhalation of Outdoor Air 2 x 10 -3 2 x 10 -7 Total Excess Cancer Risk 2 x 10 -7 Hazard Index 2 x 10 -3 Under current exposures, the theoretical excess cancer risk is 2 x 10 -7 . This value is well below the range of risks (10 -4 to 10 -6 ) considered to be acceptable by USEPA and below the FDEP criterion of 1 x 10 -6 . Similarly, non-cancer risk estimates are many times below an HI of 1.0, supporting the conclusion that exposures are substantially below levels that could result in adverse health effects. Note that potential risks to users of the Pinellas Trail are based on modeled outdoor air concentrations derived from maximum groundwater or soil vapor concentrations detected on- Site. Because the highest concentrations of COPCs in groundwater and soil vapor are located beneath the existing buildings on-Site, the risk estimates presented above more accurately reflect potential future conditions if the existing buildings are removed. Current risks from exposure to outdoor air are expected to be much lower because existing buildings prevent
51 Human Health Risk Assessment volatilization to outdoor air in the areas with the highest groundwater and soil vapor concentrations. DRAFT 6.1.9 Apartment/Condo Complex Landscapers There are two irrigation wells on the Brandywine property and a single irrigation well on the Stone’s Throw Condominium property. All three irrigation wells are more than 200 feet deep and cased to a minimum depth of 100 feet. Because existing irrigation wells are screened in the unaffected Floridan aquifer, no potential exposure pathways are complete for landscape/maintenance workers at the Brandywine Apartments and Stone’s Throw Condominium Complex. The only COPCs detected in shallow groundwater in this area are benzene and 1,4-dioxane; however, volatilization from groundwater is not considered to be a complete exposure pathway for this COPC and benzene was detected in only one shallow monitoring well (SMW-4) that, in prior sampling events, contained no benzene. Screening calculations indicate that, even if this concentration is not an artifact, potential risks from exposure to benzene in indoor and outdoor air are negligible. 6.1.10 Apartment/Condo Complex Construction/Utility Worker Potential risks to apartment/condo construction/utility workers are summarized below; COPCspecific risks are provided in Appendix A; Tables A-11, A-12 and A-13. Potential risks to off- Site utility workers assume that a worker may be dermally exposed to groundwater for 2 hours per day, 8 days per year (2 days per event and 4 events per year) over a period of 10 years. The only COPC present in shallow groundwater is 1,4-dioxane at a maximum concentration of 7.7 µg/L. Potential Risks to Off-Site Apartment/Condo Construction/Utility Workers Exposure Pathway Non-Cancer Hazard Quotient Excess Cancer Risk Inhalation of Outdoor Air NA 12 1 x 10 -12 Dermal Contact with Groundwater NA 3 x 10 -9 Ingestion of Subsurface Soil NA 1 x 10 -14 Total Excess Cancer Risk 3 x 10 -9 Hazard Index NA The cumulative theoretical excess cancer risk estimates based on modeled outdoor air concentrations is 3 x 10 -9 . This value is well below the range of risks (10 -4 to 10 -6 ) considered to be acceptable by USEPA and below the FDEP criterion of 1 x 10 -6 . No non-cancer Hazard 12 There is no reference dose available for 1,4-dioxane.
Page 1 and 2:
DRAFT Human Health Risk Assessment
Page 3 and 4: ii Human Health Risk Assessment DRA
Page 5 and 6: Executive Summary 1 Human Health Ri
Page 7 and 8: 3 Human Health Risk Assessment DRAF
Page 11 and 12: 2 Conceptual Site Model 7 Human Hea
Page 15 and 16: 11 Human Health Risk Assessment DRA
Page 19 and 20: 3.2.3 Ambient Air Sampling 15 Human
Page 21 and 22: • Inhalation of Outdoor Air On-Si
Page 27 and 28: u = Wind speed (m/s) 23 Human Healt
Page 33 and 34: EPCa = Exposure point concentration
Page 35 and 36: where: DAD = Dermal absorbed dose (
Page 37 and 38: 33 Human Health Risk Assessment san
Page 41 and 42: non-carcinogenic effects (µg/L) Ri
Page 45 and 46: 5 Toxicity Assessment 41 Human Heal
Page 53: Potential Risks to On-Site Construc
Page 59 and 60: 7 Uncertainty Analysis 55 Human Hea
Page 63 and 64: Human Health Risk Assessment 1.0 su
Page 69 and 70: DRAFT Table 1. Constituents of Pote
Page 71 and 72: DRAFT Table 3. Comparison Between I
Page 73 and 74: DRAFT Table 5. Estimated Exposure P
Page 75 and 76: DRAFT Table 6. Summary of Exposure
Page 77 and 78: DRAFT Table 8. Source and Derivatio
Page 79 and 80: Human Health Risk Assessment DRAFT
Page 81 and 82: DRAFT Primary Primary Secondary Sec
Page 83 and 84: DRAFT Table A-1. Dose and Risk Calc
Page 89 and 90: DRAFT CSFd RfDd DA event C w DAD LA
Page 93 and 94: DRAFT CSFd RfDd DA event C w DAD LA
Page 95: DRAFT Table A-13. Dose and Risk Cal
show all

Human Health Risk Assessment - Raytheon

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?