Human Health Risk Assessment - Raytheon

More documents

Recommendations

Info

8 Conclusions 58 Human Health Risk Assessment DRAFT A risk assessment was completed for potential exposures to Site-related COPCs in groundwater, soil and indoor and outdoor air at and near the Site. Potential human health risks were characterized based on COPC concentrations detected during the most recent rounds of groundwater monitoring conducted from March 2007 through May 2008. Exposure pathways were evaluated for current and likely future exposures to COPCs in groundwater, soil and indoor and outdoor air. Potential receptors included on-Site and off-Site workers, trespassers, off-Site residents and individuals involved in recreational activities along the Pinellas Trail. In addition, RBSLs were developed for a number of potentially complete exposure pathways involving residential use of irrigation water. Potentially complete exposure pathways include ingestion of irrigation water, ingestion of homegrown produce, dermal contact with irrigation water while gardening and during recreational use, and inhalation of COPCs volatilized from irrigation water to outdoor air during lawn irrigation. Calculated non-cancer and theoretical excess cancer risk estimates for the potential exposure pathways evaluated in this report support the following conclusions: • The cumulative theoretical excess cancer risk to on-Site facility workers is calculated to be 3 x 10 -6 , which is at the lower end of the range of risks that is considered to be acceptable by USEPA. It should be noted that these risks are based in part on COPCs that may not be associated with subsurface conditions or historic site uses (i.e. benzene and chloroform). Measured indoor air levels are well below OSHA standards governing worker safety. Non-cancer risk estimates for on-Site facility workers are below a hazard index of one (HI = 0.1) indicating that exposures are below levels that could result in adverse health effects. • The cumulative theoretical excess cancer risk for on-Site landscape workers is calculated to be 1 x 10 -6 , which is at the low end of the range of risks that is considered to be acceptable by USEPA and the non-cancer hazard index is 0.01. Both risk estimates are similar to the values calculated for the on-Site facility worker. The theoretical excess cancer risk and the hazard index is below 1.0, indicating that exposures are below levels that could result in adverse health effects. • The cumulative theoretical excess cancer risk to on-Site trespassers is 5 x 10 -8 which is well below the range of risks that is 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 a hazard index of one (HI = 0.001), supporting the conclusion that exposures are substantially below levels that could result in adverse health effects. • Potential risks to on-Site construction and utility workers is 9x10 -7 and 1x10 -6 , respectively, which are within or below the range of risks that is considered to be acceptable by USEPA. Similarly, non-cancer risk estimates are below a hazard index of
Human Health Risk Assessment 1.0 supporting the conclusion that exposures are below levels that could result in adverse health effects. 59 DRAFT • The cumulative theoretical excess cancer risk to off-Site construction workers is 3 x 10 -9 which is well below the range of risks that is considered to be acceptable by USEPA and below the FDEP criterion of 1 x 10 -6 . • At Azalea Park, no potential exposure pathways are complete for landscape/maintenance workers, individuals involved in recreational activities, or Recreation Center workers because there are no irrigation wells in use at the park and because a shallow clean water layer prevents potential volatilization of COPCs from underlying groundwater. • No potential exposure pathways are complete for residents of the Brandywine Apartments and Stone’s Throw Condominiums because existing irrigation wells are screened in the unaffected Floridan aquifer and the only COPC detected in the shallow aquifer on these properties is 1,4-dioxane, which is miscible and exhibits low volatility in water and therefore does not present a health threat from volatilization to indoor and outdoor air. In addition, no COPC concentrations detected in residential irrigation wells to-date exceeded RBSLs for any of the potentially complete exposure pathways involving use of irrigation water. These data suggest that based on residential irrigation well data collected to date, there is no significant health threat from exposure to irrigation water.
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 9 and 10:
5 Human Health Risk Assessment DRAF
Page 11 and 12: 2 Conceptual Site Model 7 Human Hea
Page 13 and 14: 9 Human Health Risk Assessment DRAF
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 and 54: Potential Risks to On-Site Construc
Page 55 and 56: 51 Human Health Risk Assessment vol
Page 59 and 60: 7 Uncertainty Analysis 55 Human Hea
Page 61: 57 Human Health Risk Assessment DRA
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

Create successful ePaper yourself

Delete template?

Save as template?