The elcrs for both adult camper scenarios 18 and 30

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The ELCRs for both adult camper scenarios (18 and 30 exposure durations) also exceeded 1E-04, for maximum air concentrations. Asbestos cancer risks for adult hiking, vehicle washing and vacuuming, and post-decontamination driving scenarios were
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14 all less than 1E-04, with many minimum asbestos air concentrations exhibiting risks of less than 1E-06. The ELCR values using the OEHHA unit risk were an order of magnitude greater than ELCR values based on the IRIS unit risk factor. The ELCR values for individual child activities based on the OEHHA unit risk factor, for trailing OHV riders with maximum asbestos air concentrations, always exceeded 1E-04, when 12 or more riding days per year are assumed. The ELCRs based on the IRIS unit risk factor also exceeded 1E-04 for the trailing riders with the exception of the SUV rider with closed windows. The child hiker, camper, sleeping camper, and post-decontamination rider ELCRs were all within or below EPA’s risk management range (except for the high estimate exposure camper). These values indicate that, for combined activities including an adult motorcyclist and hiker exposed to maximum asbestos concentration, cancer risks exceeded the upper value (1E-04) of EPA Superfund Program’s risk management range(1E-06 to 1E-04), when 3 or more riding days per year are assumed. The adult motorcyclist and hiker exposed to minimum concentrations had cancer risks within EPA’s risk management range. All of the combined activities for the child motorcyclist and hiker scenarios were either well below or within EPA’s risk management range. These results indicate that motorcycling, SUV driving to a staging area, camping, and hiking/hunting all can contribute significantly to risks during recreational visits to the CCMA. Asbestos exposure and cancer risks for selected combined adult recreational scenarios (e.g., weekend SUV travel to campsite combined with motorcycle riding (or hiking/hunting) and camping within the hazardous zone) were estimated in this report and were found to be a significant contributor to total recreational user risks at the CCMA. ELCRs for adult and child recreational users of the CCMA indicate unacceptable cancer risks for recreational OHV riders, especially those in trailing positions, using EPA’s Superfund risk assessment guidance as a standard. However, hiking, camping, vehicle cleaning, and post-decontamination driving activities were within EPA’s risk management range, indicating that these risks could, potentially, be mitigated through appropriate management decisions. References : Agency for Toxic Substances and Disease Registry (ATSDR). 2005. Asbestos Exposures at Oak Ridge High School, 1120 Harvard Way, El Dorado Hills, California, Health Consultation, Public Comment Release. U. S. Department of Health and Human Services, Public Health Service. May 6.
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  • Fall '17
  • CCMA, unit risk

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